* [PATCH v21 00/20] s390x: CPU Topology
@ 2023-06-30 9:17 Pierre Morel
2023-06-30 9:17 ` [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology Pierre Morel
` (20 more replies)
0 siblings, 21 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
Hi,
What is new:
- changed name of target/s390/kvm/cpu_topology to
target/s390/kvm/stsi-topology
- moved the TLE list head from a global to a local in
insert_stsi_15_1_x()
- cleaning and merging some of the avocado tests
- modification patch "query-cpu-fast" due to upstream modifications
I removed the RB but the changes are minimal.
Implementation discussions
==========================
CPU models
----------
Since the facility 11, S390_FEAT_CONFIGURATION_TOPOLOGY is already
in the CPU model for old QEMU we could not activate it as usual from
KVM but needed a KVM capability: KVM_CAP_S390_CPU_TOPOLOGY.
Checking and enabling this capability enables facility 11,
S390_FEAT_CONFIGURATION_TOPOLOGY.
It is the responsibility of the admin to ensure the same CPU
model for source and target host in a migration.
Migration
---------
When the target guest is started, the Multi-processor Topology Change
Report (MTCR) bit is set during the creation of the vCPU by KVM.
We do not need to migrate its state, in the worst case, the target
guest will see the MTCR and actualize its view of the topology
without necessity, but this will be done only one time.
Reset
-----
Reseting the topology is done during subsystem reset, the
polarization is reset to horizontal polarization.
Topology attributes
-------------------
The topology attributes are carried by the CPU object and defined
on object creation.
In the case the new attributes, socket, book, drawer, dedicated,
entitlement are not provided QEMU provides defaults values.
- Geometry defaults
The geometry default are based on the core-id of the core to
fill the geometry in a monotone way starting with drawer 0,
book 0, and filling socket 0 with the number of cores per socket,
then filling socket 1, socket 2 ... etc until the book is complete
and all books until the first drawer is complete before starting with
the next drawer.
This allows to keep existing start scripts and Libvirt existing
interface until it is extended.
- Modifiers defaults
Default entitlement is medium
Default dedication is not dedicated.
- Machine polarization default to horizontal
Dynamic topology modification
-----------------------------
QAPI interface is extended with:
- a command: 'set-cpu-topology'
- a query: 'query-cpu-polarization'
- a query: extension of qmp 'query-cpus-fast'
- a query: extension of hmp 'hotpluggable-cpus'
- an event: 'CPU_POLARITY_CHANGE'
New command and interface are specified as unstable.
The admin may use query-cpus-fast to verify the topology provided
to the guest and set-cpu-topology to modify it.
The event CPU_POLARITY_CHANGE is sent when the guest successfuly
uses the PTF(2) instruction to request a polarization change.
In that case, the admin is supposed to modify the CPU provisioning
accordingly.
Testing
=======
To use the QEMU patches, you will need Linux V6-rc1 or newer,
or use the following Linux mainline patches:
f5ecfee94493 2022-07-20 KVM: s390: resetting the Topology-Change-Report
24fe0195bc19 2022-07-20 KVM: s390: guest support for topology function
0130337ec45b 2022-07-20 KVM: s390: Cleanup ipte lock access and SIIF fac..
Currently this code is for KVM only, I have no idea if it is interesting
to provide a TCG patch. If ever it will be done in another series.
This series provide 12 avocado tests using Fedora-35 kernel and initrd
image.
Documentation
=============
To have a better understanding of the S390x CPU Topology and its
implementation in QEMU you can have a look at the documentation in the
last patch of this series.
The admin will want to match the host and the guest topology, taking
into account that the guest does not recognize multithreading.
Consequently, two vCPU assigned to threads of the same real CPU should
preferably be assigned to the same socket of the guest machine.
Regards,
Pierre
Pierre Morel (20):
s390x/cpu topology: add s390 specifics to CPU topology
s390x/cpu topology: add topology entries on CPU hotplug
target/s390x/cpu topology: handle STSI(15) and build the SYSIB
s390x/sclp: reporting the maximum nested topology entries
s390x/cpu topology: resetting the Topology-Change-Report
s390x/cpu topology: interception of PTF instruction
target/s390x/cpu topology: activate CPU topology
qapi/s390x/cpu topology: set-cpu-topology qmp command
machine: adding s390 topology to query-cpu-fast
machine: adding s390 topology to info hotpluggable-cpus
qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event
qapi/s390x/cpu topology: query-cpu-polarization qmp command
docs/s390x/cpu topology: document s390x cpu topology
tests/avocado: s390x cpu topology core
tests/avocado: s390x cpu topology polarisation
tests/avocado: s390x cpu topology entitlement tests
tests/avocado: s390x cpu topology test dedicated CPU
tests/avocado: s390x cpu topology test socket full
tests/avocado: s390x cpu topology dedicated errors
tests/avocado: s390x cpu topology bad move
MAINTAINERS | 10 +
docs/devel/index-internals.rst | 1 +
docs/devel/s390-cpu-topology.rst | 170 ++++++++++
docs/system/s390x/cpu-topology.rst | 240 ++++++++++++++
docs/system/target-s390x.rst | 1 +
qapi/machine-common.json | 22 ++
qapi/machine-target.json | 113 +++++++
qapi/machine.json | 30 +-
include/hw/boards.h | 10 +-
include/hw/qdev-properties-system.h | 4 +
include/hw/s390x/cpu-topology.h | 80 +++++
include/hw/s390x/s390-virtio-ccw.h | 6 +
include/hw/s390x/sclp.h | 4 +-
target/s390x/cpu.h | 83 +++++
target/s390x/kvm/kvm_s390x.h | 1 +
hw/core/machine-hmp-cmds.c | 6 +
hw/core/machine-smp.c | 48 ++-
hw/core/machine.c | 4 +
hw/core/qdev-properties-system.c | 13 +
hw/s390x/cpu-topology.c | 475 ++++++++++++++++++++++++++++
hw/s390x/s390-virtio-ccw.c | 27 +-
hw/s390x/sclp.c | 5 +
softmmu/vl.c | 6 +
target/s390x/cpu-sysemu.c | 13 +
target/s390x/cpu.c | 11 +
target/s390x/cpu_models.c | 1 +
target/s390x/kvm/kvm.c | 42 ++-
target/s390x/kvm/stsi-topology.c | 310 ++++++++++++++++++
hw/s390x/meson.build | 1 +
qapi/meson.build | 1 +
qemu-options.hx | 7 +-
target/s390x/kvm/meson.build | 3 +-
tests/avocado/s390_topology.py | 415 ++++++++++++++++++++++++
33 files changed, 2143 insertions(+), 20 deletions(-)
create mode 100644 docs/devel/s390-cpu-topology.rst
create mode 100644 docs/system/s390x/cpu-topology.rst
create mode 100644 qapi/machine-common.json
create mode 100644 include/hw/s390x/cpu-topology.h
create mode 100644 hw/s390x/cpu-topology.c
create mode 100644 target/s390x/kvm/stsi-topology.c
create mode 100644 tests/avocado/s390_topology.py
--
2.31.1
Since v20:
- changed name of target/s390/kvm/cpu_topology to
target/s390/kvm/stsi-topology
(Thomas, Cedric)
- moved the TLE list head from a global to a local in
insert_stsi_15_1_x()
(Nina)
- cleaning and merging some of the avocado tests
(Nina)
- Several cleanings
(Cedric, Thomas, Nina)
- moved setting of entitlement and dedicated from disapeared
cpustate_to_cpuinfo_s390() to new s390_query_cpu_fast()
- small changes to documentation to reflect last changes using
enum instead of int for polarization.
0 -> horizontal and 1 -> vertical
Since v19:
- use enum to specify the entitlement
(Nina)
- Change default entitlement to "auto"
- suppress skip_basis in avocado tests
(after comment from Cedric)
- Correction of the documentation
(Cedric)
- better code organization for s390_topology_add_core_to_socket
and s390_socket_nb
(Cedric)
- Changed Copyright to respect IBM policy
(Nina)
- set vertical_polarization back into s390_topology
(Nina)
Since v18:
- Changed default entitlement to S390_CPU_ENTITLEMENT__MAX
because no default can be correct.
- added polarization entry to the S390CcwMachineState
which allow to suppress shadow entitlement
- Suppress shadow entitlement
(Nina)
- Added query-cpu-polarization
- Added more avocado tests
- modified cpu_hierarchy_to_string to look better
(Nina)
Since v17:
- bug correction in handling PTF
- added avocado tests
(Thomas)
- Change comments on QEMU machine to 8.1
Since v16:
- documentation, split, bug correction and rephrasing
(Nina, Thomas)
- create machine-common.json
- use of entitlement_shadow to keep track of the entitlement
- adding drawers and books to query-hotpluggable-cpus
- keep hmp interface for set-cpu-topology for a future series
Since v15:
- Use Enum for polarity and entitlement
(Nina)
- move kvm_vm_enable_cap(KVM_CAP_S390_CPU_TOPOLOGY) to
kvm_arch_init()
(Thomas)
- Make all CPU attributes optional for set-cpu-topology monitor
command
(Thomas, Nina)
- Change use of the prefix "x-" to the use of feature unstable
to declare set-cpu-topology as unstable.
(Nina)
- Make CPU_POLARITY_CHANGE even as unstable
(Nina)
- Documentation update
(Thomas, Nina)
Since v14:
- move the ordering of TLE to just before filling the SYSIB,
optimize TLE ordering to be done on need only.
(Cedric in previous series)
- remove 'query-topology' and instead extend 'query-cpus-fast'
(Daniel)
- rename POLARITY_CHANGE to CPU_POLARITY_CHANGE
(Thomas)
- Divers bugs correction and doc changes
(Thomas, Nina)
- Separate topology and entitlement, simplify pft handling
(Nina)
- add the resetting of all CPU to horizontal polarity
once implementing PTF interpretation
Since v13:
- Suppress the topology device to simplify the code
(Cedric)
- moved reset of MTCR from device reset into subsystem
reset and removed previous reviewed-by from Nico and
Janis
- No need for Migration
- No need for machine dependencies
(Christian, Thomas)
- Adding all features, drawer/book and dynamic
(Cedric)
- since v12
- suppress new CPU flag "disable-topology" just use ctop
- no use of special fields in CCW machine or in CPU
- modifications in documentation
- insert documentation in tree
(Cedric)
- moved cpu-topology.c from target/s390 to target/s390/kvm
to compile smoothly (without topology) for TCG
(Cedric)
- since v11
- new CPU flag "disable-topology"
I would have take "topology" if I was able to have
it false on default.
(Christian, Thomas)
- Build the topology during the interception of the
STSI instruction.
(Cedric)
- return CC3 in case the calculated SYSIB length is
greater than 4096.
(Janis)
- minor corections on documentation
- since v10
- change machine attribute "topology-disable" to "topology"
(Cedric)
- Add preliminary patch for machine properties
(Cedric)
- Use next machine as 7.2
(Cedric / Connie)
- Remove unecessary mutex
(Thomas)
- use ENOTSUP return value for kvm_s390_topology_set_mtcr()
(Cedric)
- Add explanation on container and cpu TLEs
(Thomas)
- use again cpu and socket count in topology structure
(Cedric)
- Suppress the S390TopoTLE structure and integrate
the TLE masks to the socket structure.
(-)
- the STSI instruction now finds the topology from the machine
(Cedric)
- since v9
- remove books and drawers
- remove thread denying and replace with a merge
of cores * threads to specify the CPUs available
to the guest
- add a class option to avoid topology on older
machines
(Cedric)
- Allocate a SYSIB buffer of the maximal length to
avoid overflow.
(Nico, Janis)
- suppress redundancy of smp parameters in topology
and use directly the machine smp structure
- Early check for topology support
(Cedric)
- since v8
- Linux patches are now mainline
- simplification of the implementation
(Janis)
- Migration, new machine definition
(Thomas)
- Documentation
- since v7
- Coherence with the Linux patch series changes for MTCR get
(Pierre)
- check return values during new CPU creation
(Thomas)
- Improving codding style and argument usages
(Thomas)
- since v6
- Changes on smp args in qemu-options
(Daniel)
- changed comments in machine.jason
(Daniel)
- Added reset
(Janosch)
- since v5
- rebasing on newer QEMU version
- reworked most lines above 80 characters.
- since v4
- Added drawer and books to topology
- Added numa topology
- Added documentation
- since v3
- Added migration
(Thomas)
- Separated STSI instruction from KVM to prepare TCG
(Thomas)
- Take care of endianess to prepare TCG
(Thomas)
- Added comments on STSI CPU container and PFT instruction
(Thomas)
- Moved enabling the instructions as the last patch
(Thomas)
^ permalink raw reply [flat|nested] 78+ messages in thread
* [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-18 16:31 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug Pierre Morel
` (19 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
S390 adds two new SMP levels, drawers and books to the CPU
topology.
The S390 CPU have specific topology features like dedication
and entitlement to give to the guest indications on the host
vCPUs scheduling and help the guest take the best decisions
on the scheduling of threads on the vCPUs.
Let us provide the SMP properties with books and drawers levels
and S390 CPU with dedication and entitlement,
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
qapi/machine-common.json | 22 +++++++++++++
qapi/machine.json | 21 ++++++++++---
include/hw/boards.h | 10 +++++-
include/hw/qdev-properties-system.h | 4 +++
target/s390x/cpu.h | 6 ++++
hw/core/machine-smp.c | 48 ++++++++++++++++++++++++-----
hw/core/machine.c | 4 +++
hw/core/qdev-properties-system.c | 13 ++++++++
hw/s390x/s390-virtio-ccw.c | 2 ++
softmmu/vl.c | 6 ++++
target/s390x/cpu.c | 7 +++++
qapi/meson.build | 1 +
qemu-options.hx | 7 +++--
13 files changed, 137 insertions(+), 14 deletions(-)
create mode 100644 qapi/machine-common.json
diff --git a/qapi/machine-common.json b/qapi/machine-common.json
new file mode 100644
index 0000000000..bc0d76829c
--- /dev/null
+++ b/qapi/machine-common.json
@@ -0,0 +1,22 @@
+# -*- Mode: Python -*-
+# vim: filetype=python
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+
+##
+# = Machines S390 data types
+##
+
+##
+# @CpuS390Entitlement:
+#
+# An enumeration of cpu entitlements that can be assumed by a virtual
+# S390 CPU
+#
+# Since: 8.1
+##
+{ 'enum': 'CpuS390Entitlement',
+ 'prefix': 'S390_CPU_ENTITLEMENT',
+ 'data': [ 'auto', 'low', 'medium', 'high' ] }
+
diff --git a/qapi/machine.json b/qapi/machine.json
index a08b6576ca..08245beea1 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -9,6 +9,7 @@
##
{ 'include': 'common.json' }
+{ 'include': 'machine-common.json' }
##
# @SysEmuTarget:
@@ -71,8 +72,8 @@
#
# @thread-id: ID of the underlying host thread
#
-# @props: properties describing to which node/socket/core/thread
-# virtual CPU belongs to, provided if supported by board
+# @props: properties describing to which node/drawer/book/socket/core/thread
+# virtual CPU belongs to, provided if supported by board
#
# @target: the QEMU system emulation target, which determines which
# additional fields will be listed (since 3.0)
@@ -901,7 +902,11 @@
#
# @node-id: NUMA node ID the CPU belongs to
#
-# @socket-id: socket number within node/board the CPU belongs to
+# @drawer-id: drawer number within node/board the CPU belongs to (since 8.1)
+#
+# @book-id: book number within drawer/node/board the CPU belongs to (since 8.1)
+#
+# @socket-id: socket number within book/node/board the CPU belongs to
#
# @die-id: die number within socket the CPU belongs to (since 4.1)
#
@@ -912,7 +917,7 @@
#
# @thread-id: thread number within core the CPU belongs to
#
-# Note: currently there are 6 properties that could be present but
+# Note: currently there are 8 properties that could be present but
# management should be prepared to pass through other properties
# with device_add command to allow for future interface extension.
# This also requires the filed names to be kept in sync with the
@@ -922,6 +927,8 @@
##
{ 'struct': 'CpuInstanceProperties',
'data': { '*node-id': 'int',
+ '*drawer-id': 'int',
+ '*book-id': 'int',
'*socket-id': 'int',
'*die-id': 'int',
'*cluster-id': 'int',
@@ -1480,6 +1487,10 @@
#
# @cpus: number of virtual CPUs in the virtual machine
#
+# @drawers: number of drawers in the CPU topology (since 8.1)
+#
+# @books: number of books in the CPU topology (since 8.1)
+#
# @sockets: number of sockets in the CPU topology
#
# @dies: number of dies per socket in the CPU topology
@@ -1498,6 +1509,8 @@
##
{ 'struct': 'SMPConfiguration', 'data': {
'*cpus': 'int',
+ '*drawers': 'int',
+ '*books': 'int',
'*sockets': 'int',
'*dies': 'int',
'*clusters': 'int',
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 6b267c21ce..306699df3c 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -131,12 +131,16 @@ typedef struct {
* @clusters_supported - whether clusters are supported by the machine
* @has_clusters - whether clusters are explicitly specified in the user
* provided SMP configuration
+ * @books_supported - whether books are supported by the machine
+ * @drawers_supported - whether drawers are supported by the machine
*/
typedef struct {
bool prefer_sockets;
bool dies_supported;
bool clusters_supported;
bool has_clusters;
+ bool books_supported;
+ bool drawers_supported;
} SMPCompatProps;
/**
@@ -305,7 +309,9 @@ typedef struct DeviceMemoryState {
/**
* CpuTopology:
* @cpus: the number of present logical processors on the machine
- * @sockets: the number of sockets on the machine
+ * @drawers: the number of drawers on the machine
+ * @books: the number of books in one drawer
+ * @sockets: the number of sockets in one book
* @dies: the number of dies in one socket
* @clusters: the number of clusters in one die
* @cores: the number of cores in one cluster
@@ -314,6 +320,8 @@ typedef struct DeviceMemoryState {
*/
typedef struct CpuTopology {
unsigned int cpus;
+ unsigned int drawers;
+ unsigned int books;
unsigned int sockets;
unsigned int dies;
unsigned int clusters;
diff --git a/include/hw/qdev-properties-system.h b/include/hw/qdev-properties-system.h
index 0ac327ae60..e4f8a13afc 100644
--- a/include/hw/qdev-properties-system.h
+++ b/include/hw/qdev-properties-system.h
@@ -22,6 +22,7 @@ extern const PropertyInfo qdev_prop_audiodev;
extern const PropertyInfo qdev_prop_off_auto_pcibar;
extern const PropertyInfo qdev_prop_pcie_link_speed;
extern const PropertyInfo qdev_prop_pcie_link_width;
+extern const PropertyInfo qdev_prop_cpus390entitlement;
#define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d) \
DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_pci_devfn, int32_t)
@@ -73,5 +74,8 @@ extern const PropertyInfo qdev_prop_pcie_link_width;
#define DEFINE_PROP_UUID_NODEFAULT(_name, _state, _field) \
DEFINE_PROP(_name, _state, _field, qdev_prop_uuid, QemuUUID)
+#define DEFINE_PROP_CPUS390ENTITLEMENT(_n, _s, _f, _d) \
+ DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_cpus390entitlement, \
+ CpuS390Entitlement)
#endif
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index eb5b65b7d3..7ebd5e05b6 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -30,6 +30,7 @@
#include "exec/cpu-defs.h"
#include "qemu/cpu-float.h"
#include "tcg/tcg_s390x.h"
+#include "qapi/qapi-types-machine-common.h"
#define ELF_MACHINE_UNAME "S390X"
@@ -130,6 +131,11 @@ struct CPUArchState {
#if !defined(CONFIG_USER_ONLY)
uint32_t core_id; /* PoP "CPU address", same as cpu_index */
+ int32_t socket_id;
+ int32_t book_id;
+ int32_t drawer_id;
+ bool dedicated;
+ CpuS390Entitlement entitlement; /* Used only for vertical polarization */
uint64_t cpuid;
#endif
diff --git a/hw/core/machine-smp.c b/hw/core/machine-smp.c
index 89fe0cda42..68f8545c21 100644
--- a/hw/core/machine-smp.c
+++ b/hw/core/machine-smp.c
@@ -33,6 +33,14 @@ static char *cpu_hierarchy_to_string(MachineState *ms)
MachineClass *mc = MACHINE_GET_CLASS(ms);
GString *s = g_string_new(NULL);
+ if (mc->smp_props.drawers_supported) {
+ g_string_append_printf(s, "drawers (%u) * ", ms->smp.drawers);
+ }
+
+ if (mc->smp_props.books_supported) {
+ g_string_append_printf(s, "books (%u) * ", ms->smp.books);
+ }
+
g_string_append_printf(s, "sockets (%u)", ms->smp.sockets);
if (mc->smp_props.dies_supported) {
@@ -75,6 +83,8 @@ void machine_parse_smp_config(MachineState *ms,
{
MachineClass *mc = MACHINE_GET_CLASS(ms);
unsigned cpus = config->has_cpus ? config->cpus : 0;
+ unsigned drawers = config->has_drawers ? config->drawers : 0;
+ unsigned books = config->has_books ? config->books : 0;
unsigned sockets = config->has_sockets ? config->sockets : 0;
unsigned dies = config->has_dies ? config->dies : 0;
unsigned clusters = config->has_clusters ? config->clusters : 0;
@@ -87,6 +97,8 @@ void machine_parse_smp_config(MachineState *ms,
* explicit configuration like "cpus=0" is not allowed.
*/
if ((config->has_cpus && config->cpus == 0) ||
+ (config->has_drawers && config->drawers == 0) ||
+ (config->has_books && config->books == 0) ||
(config->has_sockets && config->sockets == 0) ||
(config->has_dies && config->dies == 0) ||
(config->has_clusters && config->clusters == 0) ||
@@ -113,6 +125,19 @@ void machine_parse_smp_config(MachineState *ms,
dies = dies > 0 ? dies : 1;
clusters = clusters > 0 ? clusters : 1;
+ if (!mc->smp_props.books_supported && books > 1) {
+ error_setg(errp, "books not supported by this machine's CPU topology");
+ return;
+ }
+ books = books > 0 ? books : 1;
+
+ if (!mc->smp_props.drawers_supported && drawers > 1) {
+ error_setg(errp,
+ "drawers not supported by this machine's CPU topology");
+ return;
+ }
+ drawers = drawers > 0 ? drawers : 1;
+
/* compute missing values based on the provided ones */
if (cpus == 0 && maxcpus == 0) {
sockets = sockets > 0 ? sockets : 1;
@@ -126,33 +151,41 @@ void machine_parse_smp_config(MachineState *ms,
if (sockets == 0) {
cores = cores > 0 ? cores : 1;
threads = threads > 0 ? threads : 1;
- sockets = maxcpus / (dies * clusters * cores * threads);
+ sockets = maxcpus /
+ (drawers * books * dies * clusters * cores * threads);
} else if (cores == 0) {
threads = threads > 0 ? threads : 1;
- cores = maxcpus / (sockets * dies * clusters * threads);
+ cores = maxcpus /
+ (drawers * books * sockets * dies * clusters * threads);
}
} else {
/* prefer cores over sockets since 6.2 */
if (cores == 0) {
sockets = sockets > 0 ? sockets : 1;
threads = threads > 0 ? threads : 1;
- cores = maxcpus / (sockets * dies * clusters * threads);
+ cores = maxcpus /
+ (drawers * books * sockets * dies * clusters * threads);
} else if (sockets == 0) {
threads = threads > 0 ? threads : 1;
- sockets = maxcpus / (dies * clusters * cores * threads);
+ sockets = maxcpus /
+ (drawers * books * dies * clusters * cores * threads);
}
}
/* try to calculate omitted threads at last */
if (threads == 0) {
- threads = maxcpus / (sockets * dies * clusters * cores);
+ threads = maxcpus /
+ (drawers * books * sockets * dies * clusters * cores);
}
}
- maxcpus = maxcpus > 0 ? maxcpus : sockets * dies * clusters * cores * threads;
+ maxcpus = maxcpus > 0 ? maxcpus : drawers * books * sockets * dies *
+ clusters * cores * threads;
cpus = cpus > 0 ? cpus : maxcpus;
ms->smp.cpus = cpus;
+ ms->smp.drawers = drawers;
+ ms->smp.books = books;
ms->smp.sockets = sockets;
ms->smp.dies = dies;
ms->smp.clusters = clusters;
@@ -163,7 +196,8 @@ void machine_parse_smp_config(MachineState *ms,
mc->smp_props.has_clusters = config->has_clusters;
/* sanity-check of the computed topology */
- if (sockets * dies * clusters * cores * threads != maxcpus) {
+ if (drawers * books * sockets * dies * clusters * cores * threads !=
+ maxcpus) {
g_autofree char *topo_msg = cpu_hierarchy_to_string(ms);
error_setg(errp, "Invalid CPU topology: "
"product of the hierarchy must match maxcpus: "
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 46f8f9a2b0..719bc0de87 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -839,6 +839,8 @@ static void machine_get_smp(Object *obj, Visitor *v, const char *name,
MachineState *ms = MACHINE(obj);
SMPConfiguration *config = &(SMPConfiguration){
.has_cpus = true, .cpus = ms->smp.cpus,
+ .has_drawers = true, .drawers = ms->smp.drawers,
+ .has_books = true, .books = ms->smp.books,
.has_sockets = true, .sockets = ms->smp.sockets,
.has_dies = true, .dies = ms->smp.dies,
.has_clusters = true, .clusters = ms->smp.clusters,
@@ -1104,6 +1106,8 @@ static void machine_initfn(Object *obj)
/* default to mc->default_cpus */
ms->smp.cpus = mc->default_cpus;
ms->smp.max_cpus = mc->default_cpus;
+ ms->smp.drawers = 1;
+ ms->smp.books = 1;
ms->smp.sockets = 1;
ms->smp.dies = 1;
ms->smp.clusters = 1;
diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index 6d5d43eda2..7f50ce9746 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -1147,3 +1147,16 @@ const PropertyInfo qdev_prop_uuid = {
.set = set_uuid,
.set_default_value = set_default_uuid_auto,
};
+
+/* --- s390 cpu entitlement policy --- */
+
+QEMU_BUILD_BUG_ON(sizeof(CpuS390Entitlement) != sizeof(int));
+
+const PropertyInfo qdev_prop_cpus390entitlement = {
+ .name = "CpuS390Entitlement",
+ .description = "low/medium (default)/high",
+ .enum_table = &CpuS390Entitlement_lookup,
+ .get = qdev_propinfo_get_enum,
+ .set = qdev_propinfo_set_enum,
+ .set_default_value = qdev_propinfo_set_default_value_enum,
+};
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 2dece8eab8..7540cc9093 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -737,6 +737,8 @@ static void ccw_machine_class_init(ObjectClass *oc, void *data)
mc->no_sdcard = 1;
mc->max_cpus = S390_MAX_CPUS;
mc->has_hotpluggable_cpus = true;
+ mc->smp_props.books_supported = true;
+ mc->smp_props.drawers_supported = true;
assert(!mc->get_hotplug_handler);
mc->get_hotplug_handler = s390_get_hotplug_handler;
mc->cpu_index_to_instance_props = s390_cpu_index_to_props;
diff --git a/softmmu/vl.c b/softmmu/vl.c
index b0b96f67fa..802c3c0c22 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -725,6 +725,12 @@ static QemuOptsList qemu_smp_opts = {
{
.name = "cpus",
.type = QEMU_OPT_NUMBER,
+ }, {
+ .name = "drawers",
+ .type = QEMU_OPT_NUMBER,
+ }, {
+ .name = "books",
+ .type = QEMU_OPT_NUMBER,
}, {
.name = "sockets",
.type = QEMU_OPT_NUMBER,
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index df167493c3..74405beb51 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -31,6 +31,7 @@
#include "qapi/qapi-types-machine.h"
#include "sysemu/hw_accel.h"
#include "hw/qdev-properties.h"
+#include "hw/qdev-properties-system.h"
#include "fpu/softfloat-helpers.h"
#include "disas/capstone.h"
#include "sysemu/tcg.h"
@@ -292,6 +293,12 @@ static gchar *s390_gdb_arch_name(CPUState *cs)
static Property s390x_cpu_properties[] = {
#if !defined(CONFIG_USER_ONLY)
DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
+ DEFINE_PROP_INT32("socket-id", S390CPU, env.socket_id, -1),
+ DEFINE_PROP_INT32("book-id", S390CPU, env.book_id, -1),
+ DEFINE_PROP_INT32("drawer-id", S390CPU, env.drawer_id, -1),
+ DEFINE_PROP_BOOL("dedicated", S390CPU, env.dedicated, false),
+ DEFINE_PROP_CPUS390ENTITLEMENT("entitlement", S390CPU, env.entitlement,
+ S390_CPU_ENTITLEMENT_AUTO),
#endif
DEFINE_PROP_END_OF_LIST()
};
diff --git a/qapi/meson.build b/qapi/meson.build
index 60a668b343..f81a37565c 100644
--- a/qapi/meson.build
+++ b/qapi/meson.build
@@ -36,6 +36,7 @@ qapi_all_modules = [
'error',
'introspect',
'job',
+ 'machine-common',
'machine',
'machine-target',
'migration',
diff --git a/qemu-options.hx b/qemu-options.hx
index b57489d7ca..cbcce5dc9e 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -257,11 +257,14 @@ SRST
ERST
DEF("smp", HAS_ARG, QEMU_OPTION_smp,
- "-smp [[cpus=]n][,maxcpus=maxcpus][,sockets=sockets][,dies=dies][,clusters=clusters][,cores=cores][,threads=threads]\n"
+ "-smp [[cpus=]n][,maxcpus=maxcpus][,drawers=drawers][,books=books][,sockets=sockets]\n"
+ " [,dies=dies][,clusters=clusters][,cores=cores][,threads=threads]\n"
" set the number of initial CPUs to 'n' [default=1]\n"
" maxcpus= maximum number of total CPUs, including\n"
" offline CPUs for hotplug, etc\n"
- " sockets= number of sockets on the machine board\n"
+ " drawers= number of drawers on the machine board\n"
+ " books= number of books in one drawer\n"
+ " sockets= number of sockets in one book\n"
" dies= number of dies in one socket\n"
" clusters= number of clusters in one die\n"
" cores= number of cores in one cluster\n"
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
2023-06-30 9:17 ` [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-04 10:32 ` Thomas Huth
2023-07-24 20:19 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB Pierre Morel
` (18 subsequent siblings)
20 siblings, 2 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
The topology information are attributes of the CPU and are
specified during the CPU device creation.
On hot plug we:
- calculate the default values for the topology for drawers,
books and sockets in the case they are not specified.
- verify the CPU attributes
- check that we have still room on the desired socket
The possibility to insert a CPU in a mask is dependent on the
number of cores allowed in a socket, a book or a drawer, the
checking is done during the hot plug of the CPU to have an
immediate answer.
If the complete topology is not specified, the core is added
in the physical topology based on its core ID and it gets
defaults values for the modifier attributes.
This way, starting QEMU without specifying the topology can
still get some advantage of the CPU topology.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
MAINTAINERS | 6 +
include/hw/s390x/cpu-topology.h | 54 +++++++
hw/s390x/cpu-topology.c | 264 ++++++++++++++++++++++++++++++++
hw/s390x/s390-virtio-ccw.c | 22 ++-
hw/s390x/meson.build | 1 +
5 files changed, 345 insertions(+), 2 deletions(-)
create mode 100644 include/hw/s390x/cpu-topology.h
create mode 100644 hw/s390x/cpu-topology.c
diff --git a/MAINTAINERS b/MAINTAINERS
index aba07722f6..0b03ac5a9b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1697,6 +1697,12 @@ F: hw/s390x/event-facility.c
F: hw/s390x/sclp*.c
L: qemu-s390x@nongnu.org
+S390 CPU topology
+M: Pierre Morel <pmorel@linux.ibm.com>
+S: Supported
+F: include/hw/s390x/cpu-topology.h
+F: hw/s390x/cpu-topology.c
+
X86 Machines
------------
PC
diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h
new file mode 100644
index 0000000000..9164ac00a7
--- /dev/null
+++ b/include/hw/s390x/cpu-topology.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * CPU Topology
+ *
+ * Copyright IBM Corp. 2022,2023
+ * Author(s): Pierre Morel <pmorel@linux.ibm.com>
+ *
+ */
+#ifndef HW_S390X_CPU_TOPOLOGY_H
+#define HW_S390X_CPU_TOPOLOGY_H
+
+#ifndef CONFIG_USER_ONLY
+
+#include "qemu/queue.h"
+#include "hw/boards.h"
+#include "qapi/qapi-types-machine-target.h"
+
+typedef struct S390Topology {
+ uint8_t *cores_per_socket;
+} S390Topology;
+
+#ifdef CONFIG_KVM
+bool s390_has_topology(void);
+void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error **errp);
+#else
+static inline bool s390_has_topology(void)
+{
+ return false;
+}
+static inline void s390_topology_setup_cpu(MachineState *ms,
+ S390CPU *cpu,
+ Error **errp) {}
+#endif
+
+extern S390Topology s390_topology;
+
+static inline int s390_std_socket(int n, CpuTopology *smp)
+{
+ return (n / smp->cores) % smp->sockets;
+}
+
+static inline int s390_std_book(int n, CpuTopology *smp)
+{
+ return (n / (smp->cores * smp->sockets)) % smp->books;
+}
+
+static inline int s390_std_drawer(int n, CpuTopology *smp)
+{
+ return (n / (smp->cores * smp->sockets * smp->books)) % smp->drawers;
+}
+
+#endif /* CONFIG_USER_ONLY */
+
+#endif
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
new file mode 100644
index 0000000000..b163c17f8f
--- /dev/null
+++ b/hw/s390x/cpu-topology.c
@@ -0,0 +1,264 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * CPU Topology
+ *
+ * Copyright IBM Corp. 2022,2023
+ * Author(s): Pierre Morel <pmorel@linux.ibm.com>
+ *
+ * S390 topology handling can be divided in two parts:
+ *
+ * - The first part in this file is taking care of all common functions
+ * used by KVM and TCG to create and modify the topology.
+ *
+ * - The second part, building the topology information data for the
+ * guest with CPU and KVM specificity will be implemented inside
+ * the target/s390/kvm sub tree.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "hw/qdev-properties.h"
+#include "hw/boards.h"
+#include "target/s390x/cpu.h"
+#include "hw/s390x/s390-virtio-ccw.h"
+#include "hw/s390x/cpu-topology.h"
+
+/*
+ * s390_topology is used to keep the topology information.
+ * .cores_per_socket: tracks information on the count of cores
+ * per socket.
+ * .smp: keeps track of the machine topology.
+ *
+ */
+S390Topology s390_topology = {
+ /* will be initialized after the cpu model is realized */
+ .cores_per_socket = NULL,
+};
+
+/**
+ * s390_socket_nb:
+ * @cpu: s390x CPU
+ *
+ * Returns the socket number used inside the cores_per_socket array
+ * for a topology tree entry
+ */
+static int __s390_socket_nb(int drawer_id, int book_id, int socket_id)
+{
+ return (drawer_id * current_machine->smp.books + book_id) *
+ current_machine->smp.sockets + socket_id;
+}
+
+/**
+ * s390_socket_nb:
+ * @cpu: s390x CPU
+ *
+ * Returns the socket number used inside the cores_per_socket array
+ * for a cpu.
+ */
+static int s390_socket_nb(S390CPU *cpu)
+{
+ return __s390_socket_nb(cpu->env.drawer_id, cpu->env.book_id,
+ cpu->env.socket_id);
+}
+
+/**
+ * s390_has_topology:
+ *
+ * Return value: if the topology is supported by the machine.
+ */
+bool s390_has_topology(void)
+{
+ return false;
+}
+
+/**
+ * s390_topology_init:
+ * @ms: the machine state where the machine topology is defined
+ *
+ * Keep track of the machine topology.
+ *
+ * Allocate an array to keep the count of cores per socket.
+ * The index of the array starts at socket 0 from book 0 and
+ * drawer 0 up to the maximum allowed by the machine topology.
+ */
+static void s390_topology_init(MachineState *ms)
+{
+ CpuTopology *smp = &ms->smp;
+
+ s390_topology.cores_per_socket = g_new0(uint8_t, smp->sockets *
+ smp->books * smp->drawers);
+}
+
+/**
+ * s390_topology_cpu_default:
+ * @cpu: pointer to a S390CPU
+ * @errp: Error pointer
+ *
+ * Setup the default topology if no attributes are already set.
+ * Passing a CPU with some, but not all, attributes set is considered
+ * an error.
+ *
+ * The function calculates the (drawer_id, book_id, socket_id)
+ * topology by filling the cores starting from the first socket
+ * (0, 0, 0) up to the last (smp->drawers, smp->books, smp->sockets).
+ *
+ * CPU type and dedication have defaults values set in the
+ * s390x_cpu_properties, entitlement must be adjust depending on the
+ * dedication.
+ *
+ * Returns false if it is impossible to setup a default topology
+ * true otherwise.
+ */
+static bool s390_topology_cpu_default(S390CPU *cpu, Error **errp)
+{
+ CpuTopology *smp = ¤t_machine->smp;
+ CPUS390XState *env = &cpu->env;
+
+ /* All geometry topology attributes must be set or all unset */
+ if ((env->socket_id < 0 || env->book_id < 0 || env->drawer_id < 0) &&
+ (env->socket_id >= 0 || env->book_id >= 0 || env->drawer_id >= 0)) {
+ error_setg(errp,
+ "Please define all or none of the topology geometry attributes");
+ return false;
+ }
+
+ /* Check if one of the geometry topology is unset */
+ if (env->socket_id < 0) {
+ /* Calculate default geometry topology attributes */
+ env->socket_id = s390_std_socket(env->core_id, smp);
+ env->book_id = s390_std_book(env->core_id, smp);
+ env->drawer_id = s390_std_drawer(env->core_id, smp);
+ }
+
+ /*
+ * When the user specifies the entitlement as 'auto' on the command line,
+ * qemu will set the entitlement as:
+ * Medium when the CPU is not dedicated.
+ * High when dedicated is true.
+ */
+ if (env->entitlement == S390_CPU_ENTITLEMENT_AUTO) {
+ if (env->dedicated) {
+ env->entitlement = S390_CPU_ENTITLEMENT_HIGH;
+ } else {
+ env->entitlement = S390_CPU_ENTITLEMENT_MEDIUM;
+ }
+ }
+ return true;
+}
+
+/**
+ * s390_topology_check:
+ * @socket_id: socket to check
+ * @book_id: book to check
+ * @drawer_id: drawer to check
+ * @entitlement: entitlement to check
+ * @dedicated: dedication to check
+ * @errp: Error pointer
+ *
+ * The function checks if the topology
+ * attributes fits inside the system topology.
+ *
+ * Returns false if the specified topology does not match with
+ * the machine topology.
+ */
+static bool s390_topology_check(uint16_t socket_id, uint16_t book_id,
+ uint16_t drawer_id, uint16_t entitlement,
+ bool dedicated, Error **errp)
+{
+ CpuTopology *smp = ¤t_machine->smp;
+ ERRP_GUARD();
+
+ if (socket_id >= smp->sockets) {
+ error_setg(errp, "Unavailable socket: %d", socket_id);
+ return false;
+ }
+ if (book_id >= smp->books) {
+ error_setg(errp, "Unavailable book: %d", book_id);
+ return false;
+ }
+ if (drawer_id >= smp->drawers) {
+ error_setg(errp, "Unavailable drawer: %d", drawer_id);
+ return false;
+ }
+ if (entitlement >= S390_CPU_ENTITLEMENT__MAX) {
+ error_setg(errp, "Unknown entitlement: %d", entitlement);
+ return false;
+ }
+ if (dedicated && (entitlement == S390_CPU_ENTITLEMENT_LOW ||
+ entitlement == S390_CPU_ENTITLEMENT_MEDIUM)) {
+ error_setg(errp, "A dedicated cpu implies high entitlement");
+ return false;
+ }
+ return true;
+}
+
+/**
+ * s390_update_cpu_props:
+ * @ms: the machine state
+ * @cpu: the CPU for which to update the properties from the environment.
+ *
+ */
+static void s390_update_cpu_props(MachineState *ms, S390CPU *cpu)
+{
+ CpuInstanceProperties *props;
+
+ props = &ms->possible_cpus->cpus[cpu->env.core_id].props;
+
+ props->socket_id = cpu->env.socket_id;
+ props->book_id = cpu->env.book_id;
+ props->drawer_id = cpu->env.drawer_id;
+}
+
+/**
+ * s390_topology_setup_cpu:
+ * @ms: MachineState used to initialize the topology structure on
+ * first call.
+ * @cpu: the new S390CPU to insert in the topology structure
+ * @errp: the error pointer
+ *
+ * Called from CPU hotplug to check and setup the CPU attributes
+ * before the CPU is inserted in the topology.
+ * There is no need to update the MTCR explicitly here because it
+ * will be updated by KVM on creation of the new CPU.
+ */
+void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error **errp)
+{
+ ERRP_GUARD();
+ int entry;
+
+ /*
+ * We do not want to initialize the topology if the cpu model
+ * does not support topology, consequently, we have to wait for
+ * the first CPU to be realized, which realizes the CPU model
+ * to initialize the topology structures.
+ *
+ * s390_topology_setup_cpu() is called from the cpu hotplug.
+ */
+ if (!s390_topology.cores_per_socket) {
+ s390_topology_init(ms);
+ }
+
+ if (!s390_topology_cpu_default(cpu, errp)) {
+ return;
+ }
+
+ if (!s390_topology_check(cpu->env.socket_id, cpu->env.book_id,
+ cpu->env.drawer_id, cpu->env.entitlement,
+ cpu->env.dedicated, errp)) {
+ return;
+ }
+
+ /* Do we still have space in the socket */
+ entry = s390_socket_nb(cpu);
+ if (s390_topology.cores_per_socket[entry] >= current_machine->smp.cores) {
+ error_setg(errp, "No more space on this socket");
+ return;
+ }
+
+ /* Update the count of cores in sockets */
+ s390_topology.cores_per_socket[entry] += 1;
+
+ /* topology tree is reflected in props */
+ s390_update_cpu_props(ms, cpu);
+}
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 7540cc9093..1dac9d5073 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -45,6 +45,7 @@
#include "hw/s390x/pv.h"
#include "migration/blocker.h"
#include "qapi/visitor.h"
+#include "hw/s390x/cpu-topology.h"
static Error *pv_mig_blocker;
@@ -312,10 +313,18 @@ static void s390_cpu_plug(HotplugHandler *hotplug_dev,
{
MachineState *ms = MACHINE(hotplug_dev);
S390CPU *cpu = S390_CPU(dev);
+ ERRP_GUARD();
g_assert(!ms->possible_cpus->cpus[cpu->env.core_id].cpu);
ms->possible_cpus->cpus[cpu->env.core_id].cpu = OBJECT(dev);
+ if (s390_has_topology()) {
+ s390_topology_setup_cpu(ms, cpu, errp);
+ if (*errp) {
+ return;
+ }
+ }
+
if (dev->hotplugged) {
raise_irq_cpu_hotplug();
}
@@ -555,11 +564,20 @@ static const CPUArchIdList *s390_possible_cpu_arch_ids(MachineState *ms)
sizeof(CPUArchId) * max_cpus);
ms->possible_cpus->len = max_cpus;
for (i = 0; i < ms->possible_cpus->len; i++) {
+ CpuInstanceProperties *props = &ms->possible_cpus->cpus[i].props;
+
ms->possible_cpus->cpus[i].type = ms->cpu_type;
ms->possible_cpus->cpus[i].vcpus_count = 1;
ms->possible_cpus->cpus[i].arch_id = i;
- ms->possible_cpus->cpus[i].props.has_core_id = true;
- ms->possible_cpus->cpus[i].props.core_id = i;
+
+ props->has_core_id = true;
+ props->core_id = i;
+ props->has_socket_id = true;
+ props->socket_id = s390_std_socket(i, &ms->smp);
+ props->has_book_id = true;
+ props->book_id = s390_std_book(i, &ms->smp);
+ props->has_drawer_id = true;
+ props->drawer_id = s390_std_drawer(i, &ms->smp);
}
return ms->possible_cpus;
diff --git a/hw/s390x/meson.build b/hw/s390x/meson.build
index f291016fee..58dfbdff4f 100644
--- a/hw/s390x/meson.build
+++ b/hw/s390x/meson.build
@@ -24,6 +24,7 @@ s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
's390-stattrib-kvm.c',
'pv.c',
's390-pci-kvm.c',
+ 'cpu-topology.c',
))
s390x_ss.add(when: 'CONFIG_TCG', if_true: files(
'tod-tcg.c',
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
2023-06-30 9:17 ` [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology Pierre Morel
2023-06-30 9:17 ` [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-04 11:40 ` Thomas Huth
` (2 more replies)
2023-06-30 9:17 ` [PATCH v21 04/20] s390x/sclp: reporting the maximum nested topology entries Pierre Morel
` (17 subsequent siblings)
20 siblings, 3 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
On interception of STSI(15.1.x) the System Information Block
(SYSIB) is built from the list of pre-ordered topology entries.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
MAINTAINERS | 1 +
qapi/machine-target.json | 14 ++
include/hw/s390x/cpu-topology.h | 25 +++
include/hw/s390x/sclp.h | 1 +
target/s390x/cpu.h | 76 ++++++++
hw/s390x/cpu-topology.c | 4 +-
target/s390x/kvm/kvm.c | 5 +-
target/s390x/kvm/stsi-topology.c | 310 +++++++++++++++++++++++++++++++
target/s390x/kvm/meson.build | 3 +-
9 files changed, 436 insertions(+), 3 deletions(-)
create mode 100644 target/s390x/kvm/stsi-topology.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 0b03ac5a9b..b8d3e8815c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1702,6 +1702,7 @@ M: Pierre Morel <pmorel@linux.ibm.com>
S: Supported
F: include/hw/s390x/cpu-topology.h
F: hw/s390x/cpu-topology.c
+F: target/s390x/kvm/stsi-topology.c
X86 Machines
------------
diff --git a/qapi/machine-target.json b/qapi/machine-target.json
index 3362f8dc3f..8ea4834e63 100644
--- a/qapi/machine-target.json
+++ b/qapi/machine-target.json
@@ -361,3 +361,17 @@
'TARGET_MIPS',
'TARGET_LOONGARCH64',
'TARGET_RISCV' ] } }
+
+##
+# @CpuS390Polarization:
+#
+# An enumeration of cpu polarization that can be assumed by a virtual
+# S390 CPU
+#
+# Since: 8.1
+##
+{ 'enum': 'CpuS390Polarization',
+ 'prefix': 'S390_CPU_POLARIZATION',
+ 'data': [ 'horizontal', 'vertical' ],
+ 'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] }
+}
diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h
index 9164ac00a7..193b33a2fc 100644
--- a/include/hw/s390x/cpu-topology.h
+++ b/include/hw/s390x/cpu-topology.h
@@ -15,10 +15,35 @@
#include "hw/boards.h"
#include "qapi/qapi-types-machine-target.h"
+#define S390_TOPOLOGY_CPU_IFL 0x03
+
+typedef union s390_topology_id {
+ uint64_t id;
+ struct {
+ uint8_t sentinel;
+ uint8_t drawer;
+ uint8_t book;
+ uint8_t socket;
+ uint8_t dedicated;
+ uint8_t entitlement;
+ uint8_t type;
+ uint8_t origin;
+ };
+} s390_topology_id;
+
+typedef struct S390TopologyEntry {
+ QTAILQ_ENTRY(S390TopologyEntry) next;
+ s390_topology_id id;
+ uint64_t mask;
+} S390TopologyEntry;
+
typedef struct S390Topology {
uint8_t *cores_per_socket;
+ bool polarization;
} S390Topology;
+typedef QTAILQ_HEAD(, S390TopologyEntry) S390TopologyList;
+
#ifdef CONFIG_KVM
bool s390_has_topology(void);
void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error **errp);
diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h
index d3ade40a5a..712fd68123 100644
--- a/include/hw/s390x/sclp.h
+++ b/include/hw/s390x/sclp.h
@@ -112,6 +112,7 @@ typedef struct CPUEntry {
} QEMU_PACKED CPUEntry;
#define SCLP_READ_SCP_INFO_FIXED_CPU_OFFSET 128
+#define SCLP_READ_SCP_INFO_MNEST 2
typedef struct ReadInfo {
SCCBHeader h;
uint16_t rnmax;
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index 7ebd5e05b6..6e7d041b01 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -569,6 +569,29 @@ typedef struct SysIB_322 {
} SysIB_322;
QEMU_BUILD_BUG_ON(sizeof(SysIB_322) != 4096);
+/*
+ * Topology Magnitude fields (MAG) indicates the maximum number of
+ * topology list entries (TLE) at the corresponding nesting level.
+ */
+#define S390_TOPOLOGY_MAG 6
+#define S390_TOPOLOGY_MAG6 0
+#define S390_TOPOLOGY_MAG5 1
+#define S390_TOPOLOGY_MAG4 2
+#define S390_TOPOLOGY_MAG3 3
+#define S390_TOPOLOGY_MAG2 4
+#define S390_TOPOLOGY_MAG1 5
+/* Configuration topology */
+typedef struct SysIB_151x {
+ uint8_t reserved0[2];
+ uint16_t length;
+ uint8_t mag[S390_TOPOLOGY_MAG];
+ uint8_t reserved1;
+ uint8_t mnest;
+ uint32_t reserved2;
+ char tle[];
+} SysIB_151x;
+QEMU_BUILD_BUG_ON(sizeof(SysIB_151x) != 16);
+
typedef union SysIB {
SysIB_111 sysib_111;
SysIB_121 sysib_121;
@@ -576,9 +599,62 @@ typedef union SysIB {
SysIB_221 sysib_221;
SysIB_222 sysib_222;
SysIB_322 sysib_322;
+ SysIB_151x sysib_151x;
} SysIB;
QEMU_BUILD_BUG_ON(sizeof(SysIB) != 4096);
+/*
+ * CPU Topology List provided by STSI with fc=15 provides a list
+ * of two different Topology List Entries (TLE) types to specify
+ * the topology hierarchy.
+ *
+ * - Container Topology List Entry
+ * Defines a container to contain other Topology List Entries
+ * of any type, nested containers or CPU.
+ * - CPU Topology List Entry
+ * Specifies the CPUs position, type, entitlement and polarization
+ * of the CPUs contained in the last Container TLE.
+ *
+ * There can be theoretically up to five levels of containers, QEMU
+ * uses only three levels, the drawer's, book's and socket's level.
+ *
+ * A container with a nesting level (NL) greater than 1 can only
+ * contain another container of nesting level NL-1.
+ *
+ * A container of nesting level 1 (socket), contains as many CPU TLE
+ * as needed to describe the position and qualities of all CPUs inside
+ * the container.
+ * The qualities of a CPU are polarization, entitlement and type.
+ *
+ * The CPU TLE defines the position of the CPUs of identical qualities
+ * using a 64bits mask which first bit has its offset defined by
+ * the CPU address orgin field of the CPU TLE like in:
+ * CPU address = origin * 64 + bit position within the mask
+ *
+ */
+/* Container type Topology List Entry */
+typedef struct SysIBTl_container {
+ uint8_t nl;
+ uint8_t reserved[6];
+ uint8_t id;
+} SysIBTl_container;
+QEMU_BUILD_BUG_ON(sizeof(SysIBTl_container) != 8);
+
+/* CPU type Topology List Entry */
+typedef struct SysIBTl_cpu {
+ uint8_t nl;
+ uint8_t reserved0[3];
+#define SYSIB_TLE_POLARITY_MASK 0x03
+#define SYSIB_TLE_DEDICATED 0x04
+ uint8_t flags;
+ uint8_t type;
+ uint16_t origin;
+ uint64_t mask;
+} SysIBTl_cpu;
+QEMU_BUILD_BUG_ON(sizeof(SysIBTl_cpu) != 16);
+
+void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr, uint8_t ar);
+
/* MMU defines */
#define ASCE_ORIGIN (~0xfffULL) /* segment table origin */
#define ASCE_SUBSPACE 0x200 /* subspace group control */
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index b163c17f8f..ca1634d0ce 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -29,11 +29,13 @@
* .cores_per_socket: tracks information on the count of cores
* per socket.
* .smp: keeps track of the machine topology.
- *
+ * .list: queue the topology entries inside which
+ * we keep the information on the CPU topology.
*/
S390Topology s390_topology = {
/* will be initialized after the cpu model is realized */
.cores_per_socket = NULL,
+ .polarization = S390_CPU_POLARIZATION_HORIZONTAL,
};
/**
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index 3ac7ec9acf..5ea358cbb0 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -1919,9 +1919,12 @@ static int handle_stsi(S390CPU *cpu)
if (run->s390_stsi.sel1 != 2 || run->s390_stsi.sel2 != 2) {
return 0;
}
- /* Only sysib 3.2.2 needs post-handling for now. */
insert_stsi_3_2_2(cpu, run->s390_stsi.addr, run->s390_stsi.ar);
return 0;
+ case 15:
+ insert_stsi_15_1_x(cpu, run->s390_stsi.sel2, run->s390_stsi.addr,
+ run->s390_stsi.ar);
+ return 0;
default:
return 0;
}
diff --git a/target/s390x/kvm/stsi-topology.c b/target/s390x/kvm/stsi-topology.c
new file mode 100644
index 0000000000..0b789450da
--- /dev/null
+++ b/target/s390x/kvm/stsi-topology.c
@@ -0,0 +1,310 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * QEMU S390x CPU Topology
+ *
+ * Copyright IBM Corp. 2022,2023
+ * Author(s): Pierre Morel <pmorel@linux.ibm.com>
+ *
+ */
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "hw/s390x/pv.h"
+#include "hw/sysbus.h"
+#include "hw/s390x/sclp.h"
+#include "hw/s390x/cpu-topology.h"
+
+/**
+ * fill_container:
+ * @p: The address of the container TLE to fill
+ * @level: The level of nesting for this container
+ * @id: The container receives a unique ID inside its own container
+ *
+ * Returns the next free TLE entry.
+ */
+static char *fill_container(char *p, int level, int id)
+{
+ SysIBTl_container *tle = (SysIBTl_container *)p;
+
+ tle->nl = level;
+ tle->id = id;
+ return p + sizeof(*tle);
+}
+
+/**
+ * fill_tle_cpu:
+ * @p: The address of the CPU TLE to fill
+ * @entry: a pointer to the S390TopologyEntry defining this
+ * CPU container.
+ *
+ * Returns the next free TLE entry.
+ */
+static char *fill_tle_cpu(char *p, S390TopologyEntry *entry)
+{
+ SysIBTl_cpu *tle = (SysIBTl_cpu *)p;
+ s390_topology_id topology_id = entry->id;
+
+ tle->nl = 0;
+ if (topology_id.dedicated) {
+ tle->flags = SYSIB_TLE_DEDICATED;
+ }
+ tle->flags |= topology_id.entitlement;
+ tle->type = topology_id.type;
+ tle->origin = cpu_to_be16(topology_id.origin * 64);
+ tle->mask = cpu_to_be64(entry->mask);
+ return p + sizeof(*tle);
+}
+
+/*
+ * Macro to check that the size of data after increment
+ * will not get bigger than the size of the SysIB.
+ */
+#define SYSIB_GUARD(data, x) do { \
+ data += x; \
+ if (data > sizeof(SysIB)) { \
+ return 0; \
+ } \
+ } while (0)
+
+/**
+ * stsi_topology_fill_sysib:
+ * @p: A pointer to the position of the first TLE
+ * @level: The nested level wanted by the guest
+ *
+ * Fill the SYSIB with the topology information as described in
+ * the PoP, nesting containers as appropriate, with the maximum
+ * nesting limited by @level.
+ *
+ * Return value:
+ * On success: the size of the SysIB_15x after being filled with TLE.
+ * On error: 0 in the case we would overrun the end of the SysIB.
+ */
+static int stsi_topology_fill_sysib(S390TopologyList *topology_list,
+ char *p, int level)
+{
+ S390TopologyEntry *entry;
+ int last_drawer = -1;
+ int last_book = -1;
+ int last_socket = -1;
+ int drawer_id = 0;
+ int book_id = 0;
+ int socket_id = 0;
+ int n = sizeof(SysIB_151x);
+
+ QTAILQ_FOREACH(entry, topology_list, next) {
+ bool drawer_change = last_drawer != entry->id.drawer;
+ bool book_change = drawer_change || last_book != entry->id.book;
+ bool socket_change = book_change || last_socket != entry->id.socket;
+
+ /* If we reach the sentinel get out */
+ if (entry->id.sentinel) {
+ break;
+ }
+
+ if (level > 3 && drawer_change) {
+ SYSIB_GUARD(n, sizeof(SysIBTl_container));
+ p = fill_container(p, 3, drawer_id++);
+ book_id = 0;
+ }
+ if (level > 2 && book_change) {
+ SYSIB_GUARD(n, sizeof(SysIBTl_container));
+ p = fill_container(p, 2, book_id++);
+ socket_id = 0;
+ }
+ if (socket_change) {
+ SYSIB_GUARD(n, sizeof(SysIBTl_container));
+ p = fill_container(p, 1, socket_id++);
+ }
+
+ SYSIB_GUARD(n, sizeof(SysIBTl_cpu));
+ p = fill_tle_cpu(p, entry);
+ last_drawer = entry->id.drawer;
+ last_book = entry->id.book;
+ last_socket = entry->id.socket;
+ }
+
+ return n;
+}
+
+/**
+ * setup_stsi:
+ * sysib: pointer to a SysIB to be filled with SysIB_151x data
+ * level: Nested level specified by the guest
+ *
+ * Setup the SYSIB for STSI 15.1, the header as well as the description
+ * of the topology.
+ */
+static int setup_stsi(S390TopologyList *topology_list, SysIB_151x *sysib,
+ int level)
+{
+ sysib->mnest = level;
+ switch (level) {
+ case 4:
+ sysib->mag[S390_TOPOLOGY_MAG4] = current_machine->smp.drawers;
+ sysib->mag[S390_TOPOLOGY_MAG3] = current_machine->smp.books;
+ sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.sockets;
+ sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
+ break;
+ case 3:
+ sysib->mag[S390_TOPOLOGY_MAG3] = current_machine->smp.drawers *
+ current_machine->smp.books;
+ sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.sockets;
+ sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
+ break;
+ case 2:
+ sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.drawers *
+ current_machine->smp.books *
+ current_machine->smp.sockets;
+ sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
+ break;
+ }
+
+ return stsi_topology_fill_sysib(topology_list, sysib->tle, level);
+}
+
+/**
+ * s390_topology_add_cpu_to_entry:
+ * @entry: Topology entry to setup
+ * @cpu: the S390CPU to add
+ *
+ * Set the core bit inside the topology mask and
+ * increments the number of cores for the socket.
+ */
+static void s390_topology_add_cpu_to_entry(S390TopologyEntry *entry,
+ S390CPU *cpu)
+{
+ set_bit(63 - (cpu->env.core_id % 64), &entry->mask);
+}
+
+/**
+ * s390_topology_from_cpu:
+ * @cpu: The S390CPU
+ *
+ * Initialize the topology id from the CPU environment.
+ */
+static s390_topology_id s390_topology_from_cpu(S390CPU *cpu)
+{
+ s390_topology_id topology_id = {0};
+
+ topology_id.drawer = cpu->env.drawer_id;
+ topology_id.book = cpu->env.book_id;
+ topology_id.socket = cpu->env.socket_id;
+ topology_id.origin = cpu->env.core_id / 64;
+ topology_id.type = S390_TOPOLOGY_CPU_IFL;
+ topology_id.dedicated = cpu->env.dedicated;
+
+ if (s390_topology.polarization == S390_CPU_POLARIZATION_VERTICAL) {
+ topology_id.entitlement = cpu->env.entitlement;
+ }
+
+ return topology_id;
+}
+
+/**
+ * s390_topology_insert:
+ * @cpu: s390CPU insert.
+ *
+ * Parse the topology list to find if the entry already
+ * exist and add the core in it.
+ * If it does not exist, allocate a new entry and insert
+ * it in the queue from lower id to greater id.
+ */
+static void s390_topology_insert(S390TopologyList *topology_list, S390CPU *cpu)
+{
+ s390_topology_id id = s390_topology_from_cpu(cpu);
+ S390TopologyEntry *entry = NULL;
+ S390TopologyEntry *tmp = NULL;
+
+ QTAILQ_FOREACH(tmp, topology_list, next) {
+ if (id.id == tmp->id.id) {
+ s390_topology_add_cpu_to_entry(tmp, cpu);
+ return;
+ } else if (id.id < tmp->id.id) {
+ entry = g_malloc0(sizeof(S390TopologyEntry));
+ entry->id.id = id.id;
+ s390_topology_add_cpu_to_entry(entry, cpu);
+ QTAILQ_INSERT_BEFORE(tmp, entry, next);
+ return;
+ }
+ }
+}
+
+/**
+ * s390_topology_fill_list_sorted:
+ *
+ * Loop over all CPU and insert it at the right place
+ * inside the TLE entry list.
+ * Fill the S390Topology list with entries according to the order
+ * specified by the PoP.
+ */
+static void s390_topology_fill_list_sorted(S390TopologyList *topology_list)
+{
+ CPUState *cs;
+
+ CPU_FOREACH(cs) {
+ s390_topology_insert(topology_list, S390_CPU(cs));
+ }
+}
+
+/**
+ * s390_topology_empty_list:
+ *
+ * Clear all entries in the S390Topology list except the sentinel.
+ */
+static void s390_topology_empty_list(S390TopologyList *topology_list)
+{
+ S390TopologyEntry *entry = NULL;
+ S390TopologyEntry *tmp = NULL;
+
+ QTAILQ_FOREACH_SAFE(entry, topology_list, next, tmp) {
+ QTAILQ_REMOVE(topology_list, entry, next);
+ g_free(entry);
+ }
+}
+
+/**
+ * insert_stsi_15_1_x:
+ * cpu: the CPU doing the call for which we set CC
+ * sel2: the selector 2, containing the nested level
+ * addr: Guest logical address of the guest SysIB
+ * ar: the access register number
+ *
+ * Create a list head for the Topology entries and initialize it.
+ * Insert the first entry as a sentinelle.
+ *
+ * Emulate STSI 15.1.x, that is, perform all necessary checks and
+ * fill the SYSIB.
+ * In case the topology description is too long to fit into the SYSIB,
+ * set CC=3 and abort without writing the SYSIB.
+ */
+void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr, uint8_t ar)
+{
+ S390TopologyList topology_list;
+ S390TopologyEntry *entry;
+ SysIB sysib = {0};
+ int length;
+
+ if (!s390_has_topology() || sel2 < 2 || sel2 > SCLP_READ_SCP_INFO_MNEST) {
+ setcc(cpu, 3);
+ return;
+ }
+
+ QTAILQ_INIT(&topology_list);
+ entry = g_malloc0(sizeof(S390TopologyEntry));
+ entry->id.sentinel = 0xff;
+ QTAILQ_INSERT_HEAD(&topology_list, entry, next);
+
+ s390_topology_fill_list_sorted(&topology_list);
+
+ length = setup_stsi(&topology_list, &sysib.sysib_151x, sel2);
+
+ if (!length) {
+ setcc(cpu, 3);
+ return;
+ }
+
+ sysib.sysib_151x.length = cpu_to_be16(length);
+ s390_cpu_virt_mem_write(cpu, addr, ar, &sysib, length);
+ setcc(cpu, 0);
+
+ s390_topology_empty_list(&topology_list);
+}
diff --git a/target/s390x/kvm/meson.build b/target/s390x/kvm/meson.build
index 37253f75bf..bcf014ba87 100644
--- a/target/s390x/kvm/meson.build
+++ b/target/s390x/kvm/meson.build
@@ -1,6 +1,7 @@
s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
- 'kvm.c'
+ 'kvm.c',
+ 'stsi-topology.c'
), if_false: files(
'stubs.c'
))
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 04/20] s390x/sclp: reporting the maximum nested topology entries
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (2 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 05/20] s390x/cpu topology: resetting the Topology-Change-Report Pierre Morel
` (16 subsequent siblings)
20 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
The maximum nested topology entries is used by the guest to
know how many nested topology are available on the machine.
Let change the MNEST value from 2 to 4 in the SCLP READ INFO
structure now that we support books and drawers.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
include/hw/s390x/sclp.h | 5 +++--
hw/s390x/sclp.c | 5 +++++
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h
index 712fd68123..902252b319 100644
--- a/include/hw/s390x/sclp.h
+++ b/include/hw/s390x/sclp.h
@@ -112,12 +112,13 @@ typedef struct CPUEntry {
} QEMU_PACKED CPUEntry;
#define SCLP_READ_SCP_INFO_FIXED_CPU_OFFSET 128
-#define SCLP_READ_SCP_INFO_MNEST 2
+#define SCLP_READ_SCP_INFO_MNEST 4
typedef struct ReadInfo {
SCCBHeader h;
uint16_t rnmax;
uint8_t rnsize;
- uint8_t _reserved1[16 - 11]; /* 11-15 */
+ uint8_t _reserved1[15 - 11]; /* 11-14 */
+ uint8_t stsi_parm; /* 15-15 */
uint16_t entries_cpu; /* 16-17 */
uint16_t offset_cpu; /* 18-19 */
uint8_t _reserved2[24 - 20]; /* 20-23 */
diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index eff74479f4..d339cbb7e4 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -20,6 +20,7 @@
#include "hw/s390x/event-facility.h"
#include "hw/s390x/s390-pci-bus.h"
#include "hw/s390x/ipl.h"
+#include "hw/s390x/cpu-topology.h"
static inline SCLPDevice *get_sclp_device(void)
{
@@ -123,6 +124,10 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
return;
}
+ if (s390_has_topology()) {
+ read_info->stsi_parm = SCLP_READ_SCP_INFO_MNEST;
+ }
+
/* CPU information */
prepare_cpu_entries(machine, entries_start, &cpu_count);
read_info->entries_cpu = cpu_to_be16(cpu_count);
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 05/20] s390x/cpu topology: resetting the Topology-Change-Report
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (3 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 04/20] s390x/sclp: reporting the maximum nested topology entries Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-25 13:43 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 06/20] s390x/cpu topology: interception of PTF instruction Pierre Morel
` (15 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
During a subsystem reset the Topology-Change-Report is cleared
by the machine.
Let's ask KVM to clear the Modified Topology Change Report (MTCR)
bit of the SCA in the case of a subsystem reset.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
include/hw/s390x/cpu-topology.h | 1 +
target/s390x/cpu.h | 1 +
target/s390x/kvm/kvm_s390x.h | 1 +
hw/s390x/cpu-topology.c | 11 +++++++++++
hw/s390x/s390-virtio-ccw.c | 3 +++
target/s390x/cpu-sysemu.c | 13 +++++++++++++
target/s390x/kvm/kvm.c | 17 +++++++++++++++++
7 files changed, 47 insertions(+)
diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h
index 193b33a2fc..ca7e9a22f2 100644
--- a/include/hw/s390x/cpu-topology.h
+++ b/include/hw/s390x/cpu-topology.h
@@ -58,6 +58,7 @@ static inline void s390_topology_setup_cpu(MachineState *ms,
#endif
extern S390Topology s390_topology;
+void s390_topology_reset(void);
static inline int s390_std_socket(int n, CpuTopology *smp)
{
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index 6e7d041b01..f236750cc5 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -654,6 +654,7 @@ typedef struct SysIBTl_cpu {
QEMU_BUILD_BUG_ON(sizeof(SysIBTl_cpu) != 16);
void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr, uint8_t ar);
+void s390_cpu_topology_set_changed(bool changed);
/* MMU defines */
#define ASCE_ORIGIN (~0xfffULL) /* segment table origin */
diff --git a/target/s390x/kvm/kvm_s390x.h b/target/s390x/kvm/kvm_s390x.h
index f9785564d0..649dae5948 100644
--- a/target/s390x/kvm/kvm_s390x.h
+++ b/target/s390x/kvm/kvm_s390x.h
@@ -47,5 +47,6 @@ void kvm_s390_crypto_reset(void);
void kvm_s390_restart_interrupt(S390CPU *cpu);
void kvm_s390_stop_interrupt(S390CPU *cpu);
void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info);
+int kvm_s390_topology_set_mtcr(uint64_t attr);
#endif /* KVM_S390X_H */
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index ca1634d0ce..764ff92573 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -92,6 +92,17 @@ static void s390_topology_init(MachineState *ms)
smp->books * smp->drawers);
}
+/**
+ * s390_topology_reset:
+ *
+ * Generic reset for CPU topology, calls s390_topology_reset()
+ * to reset the kernel Modified Topology Change Record.
+ */
+void s390_topology_reset(void)
+{
+ s390_cpu_topology_set_changed(false);
+}
+
/**
* s390_topology_cpu_default:
* @cpu: pointer to a S390CPU
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 1dac9d5073..789b87f7aa 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -123,6 +123,9 @@ static void subsystem_reset(void)
device_cold_reset(dev);
}
}
+ if (s390_has_topology()) {
+ s390_topology_reset();
+ }
}
static int virtio_ccw_hcall_notify(const uint64_t *args)
diff --git a/target/s390x/cpu-sysemu.c b/target/s390x/cpu-sysemu.c
index 97d6c760a8..a8e2552ef4 100644
--- a/target/s390x/cpu-sysemu.c
+++ b/target/s390x/cpu-sysemu.c
@@ -307,3 +307,16 @@ void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg)
kvm_s390_set_diag318(cs, arg.host_ulong);
}
}
+
+void s390_cpu_topology_set_changed(bool changed)
+{
+ int ret;
+
+ if (kvm_enabled()) {
+ ret = kvm_s390_topology_set_mtcr(changed);
+ if (ret) {
+ error_report("Failed to set Modified Topology Change Report: %s",
+ strerror(-ret));
+ }
+ }
+}
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index 5ea358cbb0..bc953151ce 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -2592,6 +2592,23 @@ int kvm_s390_get_zpci_op(void)
return cap_zpci_op;
}
+int kvm_s390_topology_set_mtcr(uint64_t attr)
+{
+ struct kvm_device_attr attribute = {
+ .group = KVM_S390_VM_CPU_TOPOLOGY,
+ .attr = attr,
+ };
+
+ if (!s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY)) {
+ return 0;
+ }
+ if (!kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_TOPOLOGY, attr)) {
+ return -ENOTSUP;
+ }
+
+ return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attribute);
+}
+
void kvm_arch_accel_class_init(ObjectClass *oc)
{
}
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 06/20] s390x/cpu topology: interception of PTF instruction
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (4 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 05/20] s390x/cpu topology: resetting the Topology-Change-Report Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-04 12:16 ` Thomas Huth
2023-06-30 9:17 ` [PATCH v21 07/20] target/s390x/cpu topology: activate CPU topology Pierre Morel
` (14 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
When the host supports the CPU topology facility, the PTF
instruction with function code 2 is interpreted by the SIE,
provided that the userland hypervisor activates the interpretation
by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension.
The PTF instructions with function code 0 and 1 are intercepted
and must be emulated by the userland hypervisor.
During RESET all CPU of the configuration are placed in
horizontal polarity.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
---
include/hw/s390x/s390-virtio-ccw.h | 6 ++++
hw/s390x/cpu-topology.c | 54 ++++++++++++++++++++++++++++++
target/s390x/kvm/kvm.c | 11 ++++++
3 files changed, 71 insertions(+)
diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h
index 9bba21a916..c1d46e78af 100644
--- a/include/hw/s390x/s390-virtio-ccw.h
+++ b/include/hw/s390x/s390-virtio-ccw.h
@@ -30,6 +30,12 @@ struct S390CcwMachineState {
uint8_t loadparm[8];
};
+#define S390_PTF_REASON_NONE (0x00 << 8)
+#define S390_PTF_REASON_DONE (0x01 << 8)
+#define S390_PTF_REASON_BUSY (0x02 << 8)
+#define S390_TOPO_FC_MASK 0xffUL
+void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra);
+
struct S390CcwMachineClass {
/*< private >*/
MachineClass parent_class;
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index 764ff92573..8c1a82bd71 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -92,6 +92,59 @@ static void s390_topology_init(MachineState *ms)
smp->books * smp->drawers);
}
+/*
+ * s390_handle_ptf:
+ *
+ * @register 1: contains the function code
+ *
+ * Function codes 0 (horizontal) and 1 (vertical) define the CPU
+ * polarization requested by the guest.
+ *
+ * Function code 2 is handling topology changes and is interpreted
+ * by the SIE.
+ */
+void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra)
+{
+ CpuS390Polarization polarization = S390_CPU_POLARIZATION_HORIZONTAL;
+ CPUS390XState *env = &cpu->env;
+ uint64_t reg = env->regs[r1];
+ int fc = reg & S390_TOPO_FC_MASK;
+
+ if (!s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY)) {
+ s390_program_interrupt(env, PGM_OPERATION, ra);
+ return;
+ }
+
+ if (env->psw.mask & PSW_MASK_PSTATE) {
+ s390_program_interrupt(env, PGM_PRIVILEGED, ra);
+ return;
+ }
+
+ if (reg & ~S390_TOPO_FC_MASK) {
+ s390_program_interrupt(env, PGM_SPECIFICATION, ra);
+ return;
+ }
+
+ switch (fc) {
+ case S390_CPU_POLARIZATION_VERTICAL:
+ polarization = S390_CPU_POLARIZATION_VERTICAL;
+ /* fallthrough */
+ case S390_CPU_POLARIZATION_HORIZONTAL:
+ if (s390_topology.polarization == polarization) {
+ env->regs[r1] |= S390_PTF_REASON_DONE;
+ setcc(cpu, 2);
+ } else {
+ s390_topology.polarization = polarization;
+ s390_cpu_topology_set_changed(true);
+ setcc(cpu, 0);
+ }
+ break;
+ default:
+ /* Note that fc == 2 is interpreted by the SIE */
+ s390_program_interrupt(env, PGM_SPECIFICATION, ra);
+ }
+}
+
/**
* s390_topology_reset:
*
@@ -101,6 +154,7 @@ static void s390_topology_init(MachineState *ms)
void s390_topology_reset(void)
{
s390_cpu_topology_set_changed(false);
+ s390_topology.polarization = S390_CPU_POLARIZATION_HORIZONTAL;
}
/**
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index bc953151ce..fb63be41b7 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -96,6 +96,7 @@
#define PRIV_B9_EQBS 0x9c
#define PRIV_B9_CLP 0xa0
+#define PRIV_B9_PTF 0xa2
#define PRIV_B9_PCISTG 0xd0
#define PRIV_B9_PCILG 0xd2
#define PRIV_B9_RPCIT 0xd3
@@ -1464,6 +1465,13 @@ static int kvm_mpcifc_service_call(S390CPU *cpu, struct kvm_run *run)
}
}
+static void kvm_handle_ptf(S390CPU *cpu, struct kvm_run *run)
+{
+ uint8_t r1 = (run->s390_sieic.ipb >> 20) & 0x0f;
+
+ s390_handle_ptf(cpu, r1, RA_IGNORED);
+}
+
static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
{
int r = 0;
@@ -1481,6 +1489,9 @@ static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
case PRIV_B9_RPCIT:
r = kvm_rpcit_service_call(cpu, run);
break;
+ case PRIV_B9_PTF:
+ kvm_handle_ptf(cpu, run);
+ break;
case PRIV_B9_EQBS:
/* just inject exception */
r = -1;
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 07/20] target/s390x/cpu topology: activate CPU topology
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (5 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 06/20] s390x/cpu topology: interception of PTF instruction Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command Pierre Morel
` (13 subsequent siblings)
20 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
The KVM capability KVM_CAP_S390_CPU_TOPOLOGY is used to
activate the S390_FEAT_CONFIGURATION_TOPOLOGY feature and
the topology facility in the host CPU model for the guest
in the case the topology is available in QEMU and in KVM.
The feature is disabled by default and fenced for SE
(secure execution).
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
hw/s390x/cpu-topology.c | 2 +-
target/s390x/cpu_models.c | 1 +
target/s390x/kvm/kvm.c | 9 +++++++++
3 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index 8c1a82bd71..1af70a5049 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -71,7 +71,7 @@ static int s390_socket_nb(S390CPU *cpu)
*/
bool s390_has_topology(void)
{
- return false;
+ return s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY);
}
/**
diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index ae8880e81d..b323e5e09d 100644
--- a/target/s390x/cpu_models.c
+++ b/target/s390x/cpu_models.c
@@ -255,6 +255,7 @@ bool s390_has_feat(S390Feat feat)
case S390_FEAT_SIE_CMMA:
case S390_FEAT_SIE_PFMFI:
case S390_FEAT_SIE_IBS:
+ case S390_FEAT_CONFIGURATION_TOPOLOGY:
return false;
break;
default:
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index fb63be41b7..e6f5b65dbe 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -371,6 +371,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
kvm_vm_enable_cap(s, KVM_CAP_S390_USER_SIGP, 0);
kvm_vm_enable_cap(s, KVM_CAP_S390_VECTOR_REGISTERS, 0);
kvm_vm_enable_cap(s, KVM_CAP_S390_USER_STSI, 0);
+ kvm_vm_enable_cap(s, KVM_CAP_S390_CPU_TOPOLOGY, 0);
if (ri_allowed()) {
if (kvm_vm_enable_cap(s, KVM_CAP_S390_RI, 0) == 0) {
cap_ri = 1;
@@ -2470,6 +2471,14 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
set_bit(S390_FEAT_UNPACK, model->features);
}
+ /*
+ * If we have kernel support for CPU Topology indicate the
+ * configuration-topology facility.
+ */
+ if (kvm_check_extension(kvm_state, KVM_CAP_S390_CPU_TOPOLOGY)) {
+ set_bit(S390_FEAT_CONFIGURATION_TOPOLOGY, model->features);
+ }
+
/* We emulate a zPCI bus and AEN, therefore we don't need HW support */
set_bit(S390_FEAT_ZPCI, model->features);
set_bit(S390_FEAT_ADAPTER_EVENT_NOTIFICATION, model->features);
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (6 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 07/20] target/s390x/cpu topology: activate CPU topology Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-04 12:53 ` Thomas Huth
2023-07-18 7:54 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 09/20] machine: adding s390 topology to query-cpu-fast Pierre Morel
` (12 subsequent siblings)
20 siblings, 2 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
The modification of the CPU attributes are done through a monitor
command.
It allows to move the core inside the topology tree to optimize
the cache usage in the case the host's hypervisor previously
moved the CPU.
The same command allows to modify the CPU attributes modifiers
like polarization entitlement and the dedicated attribute to notify
the guest if the host admin modified scheduling or dedication of a vCPU.
With this knowledge the guest has the possibility to optimize the
usage of the vCPUs.
The command has a feature unstable for the moment.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
qapi/machine-target.json | 37 +++++++++++
hw/s390x/cpu-topology.c | 134 +++++++++++++++++++++++++++++++++++++++
2 files changed, 171 insertions(+)
diff --git a/qapi/machine-target.json b/qapi/machine-target.json
index 8ea4834e63..bff4d50f0e 100644
--- a/qapi/machine-target.json
+++ b/qapi/machine-target.json
@@ -4,6 +4,8 @@
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.
+{ 'include': 'machine-common.json' }
+
##
# @CpuModelInfo:
#
@@ -375,3 +377,38 @@
'data': [ 'horizontal', 'vertical' ],
'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] }
}
+
+##
+# @set-cpu-topology:
+#
+# @core-id: the vCPU ID to be moved
+# @socket-id: optional destination socket where to move the vCPU
+# @book-id: optional destination book where to move the vCPU
+# @drawer-id: optional destination drawer where to move the vCPU
+# @entitlement: optional entitlement
+# @dedicated: optional, if the vCPU is dedicated to a real CPU
+#
+# Features:
+# @unstable: This command may still be modified.
+#
+# Modifies the topology by moving the CPU inside the topology
+# tree or by changing a modifier attribute of a CPU.
+# Default value for optional parameter is the current value
+# used by the CPU.
+#
+# Returns: Nothing on success, the reason on failure.
+#
+# Since: 8.1
+##
+{ 'command': 'set-cpu-topology',
+ 'data': {
+ 'core-id': 'uint16',
+ '*socket-id': 'uint16',
+ '*book-id': 'uint16',
+ '*drawer-id': 'uint16',
+ '*entitlement': 'CpuS390Entitlement',
+ '*dedicated': 'bool'
+ },
+ 'features': [ 'unstable' ],
+ 'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] }
+}
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index 1af70a5049..dfc4cb42a4 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -23,6 +23,7 @@
#include "target/s390x/cpu.h"
#include "hw/s390x/s390-virtio-ccw.h"
#include "hw/s390x/cpu-topology.h"
+#include "qapi/qapi-commands-machine-target.h"
/*
* s390_topology is used to keep the topology information.
@@ -260,6 +261,29 @@ static bool s390_topology_check(uint16_t socket_id, uint16_t book_id,
return true;
}
+/**
+ * s390_topology_need_report
+ * @cpu: Current cpu
+ * @drawer_id: future drawer ID
+ * @book_id: future book ID
+ * @socket_id: future socket ID
+ * @entitlement: future entitlement
+ * @dedicated: future dedicated
+ *
+ * A modified topology change report is needed if the topology
+ * tree or the topology attributes change.
+ */
+static bool s390_topology_need_report(S390CPU *cpu, int drawer_id,
+ int book_id, int socket_id,
+ uint16_t entitlement, bool dedicated)
+{
+ return cpu->env.drawer_id != drawer_id ||
+ cpu->env.book_id != book_id ||
+ cpu->env.socket_id != socket_id ||
+ cpu->env.entitlement != entitlement ||
+ cpu->env.dedicated != dedicated;
+}
+
/**
* s390_update_cpu_props:
* @ms: the machine state
@@ -329,3 +353,113 @@ void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error **errp)
/* topology tree is reflected in props */
s390_update_cpu_props(ms, cpu);
}
+
+static void s390_change_topology(uint16_t core_id,
+ bool has_socket_id, uint16_t socket_id,
+ bool has_book_id, uint16_t book_id,
+ bool has_drawer_id, uint16_t drawer_id,
+ bool has_entitlement,
+ CpuS390Entitlement entitlement,
+ bool has_dedicated, bool dedicated,
+ Error **errp)
+{
+ MachineState *ms = current_machine;
+ int old_socket_entry;
+ int new_socket_entry;
+ bool report_needed;
+ S390CPU *cpu;
+ ERRP_GUARD();
+
+ cpu = s390_cpu_addr2state(core_id);
+ if (!cpu) {
+ error_setg(errp, "Core-id %d does not exist!", core_id);
+ return;
+ }
+
+ /* Get attributes not provided from cpu and verify the new topology */
+ if (!has_socket_id) {
+ socket_id = cpu->env.socket_id;
+ }
+ if (!has_book_id) {
+ book_id = cpu->env.book_id;
+ }
+ if (!has_drawer_id) {
+ drawer_id = cpu->env.drawer_id;
+ }
+ if (!has_dedicated) {
+ dedicated = cpu->env.dedicated;
+ }
+
+ /*
+ * When the user specifies the entitlement as 'auto' on the command line,
+ * qemu will set the entitlement as:
+ * Medium when the CPU is not dedicated.
+ * High when dedicated is true.
+ */
+ if (!has_entitlement || (entitlement == S390_CPU_ENTITLEMENT_AUTO)) {
+ if (dedicated) {
+ entitlement = S390_CPU_ENTITLEMENT_HIGH;
+ } else {
+ entitlement = S390_CPU_ENTITLEMENT_MEDIUM;
+ }
+ }
+
+ if (!s390_topology_check(socket_id, book_id, drawer_id,
+ entitlement, dedicated, errp))
+ return;
+
+ /* Check for space on new socket */
+ old_socket_entry = s390_socket_nb(cpu);
+ new_socket_entry = __s390_socket_nb(drawer_id, book_id, socket_id);
+
+ if (new_socket_entry != old_socket_entry) {
+ if (s390_topology.cores_per_socket[new_socket_entry] >=
+ ms->smp.cores) {
+ error_setg(errp, "No more space on this socket");
+ return;
+ }
+ /* Update the count of cores in sockets */
+ s390_topology.cores_per_socket[new_socket_entry] += 1;
+ s390_topology.cores_per_socket[old_socket_entry] -= 1;
+ }
+
+ /* Check if we will need to report the modified topology */
+ report_needed = s390_topology_need_report(cpu, drawer_id, book_id,
+ socket_id, entitlement,
+ dedicated);
+
+ /* All checks done, report new topology into the vCPU */
+ cpu->env.drawer_id = drawer_id;
+ cpu->env.book_id = book_id;
+ cpu->env.socket_id = socket_id;
+ cpu->env.dedicated = dedicated;
+ cpu->env.entitlement = entitlement;
+
+ /* topology tree is reflected in props */
+ s390_update_cpu_props(ms, cpu);
+
+ /* Advertise the topology change */
+ if (report_needed) {
+ s390_cpu_topology_set_changed(true);
+ }
+}
+
+void qmp_set_cpu_topology(uint16_t core,
+ bool has_socket, uint16_t socket,
+ bool has_book, uint16_t book,
+ bool has_drawer, uint16_t drawer,
+ bool has_entitlement, CpuS390Entitlement entitlement,
+ bool has_dedicated, bool dedicated,
+ Error **errp)
+{
+ ERRP_GUARD();
+
+ if (!s390_has_topology()) {
+ error_setg(errp, "This machine doesn't support topology");
+ return;
+ }
+
+ s390_change_topology(core, has_socket, socket, has_book, book,
+ has_drawer, drawer, has_entitlement, entitlement,
+ has_dedicated, dedicated, errp);
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 09/20] machine: adding s390 topology to query-cpu-fast
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (7 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-04 12:55 ` Thomas Huth
2023-06-30 9:17 ` [PATCH v21 10/20] machine: adding s390 topology to info hotpluggable-cpus Pierre Morel
` (11 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
S390x provides two more topology attributes, entitlement and dedication.
Let's add these CPU attributes to the QAPI command query-cpu-fast.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
qapi/machine.json | 9 ++++++++-
target/s390x/cpu.c | 4 ++++
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/qapi/machine.json b/qapi/machine.json
index 08245beea1..a1920cb78d 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -56,10 +56,17 @@
# Additional information about a virtual S390 CPU
#
# @cpu-state: the virtual CPU's state
+# @dedicated: the virtual CPU's dedication (since 8.1)
+# @entitlement: the virtual CPU's entitlement (since 8.1)
#
# Since: 2.12
##
-{ 'struct': 'CpuInfoS390', 'data': { 'cpu-state': 'CpuS390State' } }
+{ 'struct': 'CpuInfoS390',
+ 'data': { 'cpu-state': 'CpuS390State',
+ 'dedicated': 'bool',
+ 'entitlement': 'CpuS390Entitlement'
+ }
+}
##
# @CpuInfoFast:
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 74405beb51..01938635eb 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -146,6 +146,10 @@ static void s390_query_cpu_fast(CPUState *cpu, CpuInfoFast *value)
S390CPU *s390_cpu = S390_CPU(cpu);
value->u.s390x.cpu_state = s390_cpu->env.cpu_state;
+#if !defined(CONFIG_USER_ONLY)
+ value->u.s390x.dedicated = s390_cpu->env.dedicated;
+ value->u.s390x.entitlement = s390_cpu->env.entitlement;
+#endif
}
/* S390CPUClass::reset() */
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 10/20] machine: adding s390 topology to info hotpluggable-cpus
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (8 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 09/20] machine: adding s390 topology to query-cpu-fast Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-04 12:59 ` Thomas Huth
2023-06-30 9:17 ` [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event Pierre Morel
` (10 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
S390 topology adds books and drawers topology containers.
Let's add these to the HMP information for hotpluggable cpus.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
---
hw/core/machine-hmp-cmds.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/hw/core/machine-hmp-cmds.c b/hw/core/machine-hmp-cmds.c
index c3e55ef9e9..f247ba3206 100644
--- a/hw/core/machine-hmp-cmds.c
+++ b/hw/core/machine-hmp-cmds.c
@@ -71,6 +71,12 @@ void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict)
if (c->has_node_id) {
monitor_printf(mon, " node-id: \"%" PRIu64 "\"\n", c->node_id);
}
+ if (c->has_drawer_id) {
+ monitor_printf(mon, " drawer-id: \"%" PRIu64 "\"\n", c->drawer_id);
+ }
+ if (c->has_book_id) {
+ monitor_printf(mon, " book-id: \"%" PRIu64 "\"\n", c->book_id);
+ }
if (c->has_socket_id) {
monitor_printf(mon, " socket-id: \"%" PRIu64 "\"\n", c->socket_id);
}
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (9 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 10/20] machine: adding s390 topology to info hotpluggable-cpus Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-04 13:04 ` Thomas Huth
2023-07-18 7:59 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command Pierre Morel
` (9 subsequent siblings)
20 siblings, 2 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
When the guest asks to change the polarization this change
is forwarded to the upper layer using QAPI.
The upper layer is supposed to take according decisions concerning
CPU provisioning.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
qapi/machine-target.json | 33 +++++++++++++++++++++++++++++++++
hw/s390x/cpu-topology.c | 2 ++
2 files changed, 35 insertions(+)
diff --git a/qapi/machine-target.json b/qapi/machine-target.json
index bff4d50f0e..1362e43983 100644
--- a/qapi/machine-target.json
+++ b/qapi/machine-target.json
@@ -412,3 +412,36 @@
'features': [ 'unstable' ],
'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] }
}
+
+##
+# @CPU_POLARIZATION_CHANGE:
+#
+# Emitted when the guest asks to change the polarization.
+#
+# @polarization: polarization specified by the guest
+#
+# Features:
+# @unstable: This command may still be modified.
+#
+# The guest can tell the host (via the PTF instruction) whether the
+# CPUs should be provisioned using horizontal or vertical polarization.
+#
+# On horizontal polarization the host is expected to provision all vCPUs
+# equally.
+# On vertical polarization the host can provision each vCPU differently.
+# The guest will get information on the details of the provisioning
+# the next time it uses the STSI(15) instruction.
+#
+# Since: 8.1
+#
+# Example:
+#
+# <- { "event": "CPU_POLARIZATION_CHANGE",
+# "data": { "polarization": "horizontal" },
+# "timestamp": { "seconds": 1401385907, "microseconds": 422329 } }
+##
+{ 'event': 'CPU_POLARIZATION_CHANGE',
+ 'data': { 'polarization': 'CpuS390Polarization' },
+ 'features': [ 'unstable' ],
+ 'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
+}
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index dfc4cb42a4..69f31db4af 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -24,6 +24,7 @@
#include "hw/s390x/s390-virtio-ccw.h"
#include "hw/s390x/cpu-topology.h"
#include "qapi/qapi-commands-machine-target.h"
+#include "qapi/qapi-events-machine-target.h"
/*
* s390_topology is used to keep the topology information.
@@ -137,6 +138,7 @@ void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra)
} else {
s390_topology.polarization = polarization;
s390_cpu_topology_set_changed(true);
+ qapi_event_send_cpu_polarization_change(polarization);
setcc(cpu, 0);
}
break;
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (10 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-05 7:58 ` Thomas Huth
2023-07-26 11:54 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 13/20] docs/s390x/cpu topology: document s390x cpu topology Pierre Morel
` (8 subsequent siblings)
20 siblings, 2 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
The query-cpu-polarization qmp command returns the current
CPU polarization of the machine.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
qapi/machine-target.json | 29 +++++++++++++++++++++++++++++
hw/s390x/cpu-topology.c | 8 ++++++++
2 files changed, 37 insertions(+)
diff --git a/qapi/machine-target.json b/qapi/machine-target.json
index 1362e43983..1e4b8976aa 100644
--- a/qapi/machine-target.json
+++ b/qapi/machine-target.json
@@ -445,3 +445,32 @@
'features': [ 'unstable' ],
'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
}
+
+##
+# @CpuPolarizationInfo:
+#
+# The result of a cpu polarization
+#
+# @polarization: the CPU polarization
+#
+# Since: 8.1
+##
+{ 'struct': 'CpuPolarizationInfo',
+ 'data': { 'polarization': 'CpuS390Polarization' },
+ 'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
+}
+
+##
+# @query-cpu-polarization:
+#
+# Features:
+# @unstable: This command may still be modified.
+#
+# Returns: the machine polarization
+#
+# Since: 8.1
+##
+{ 'command': 'query-cpu-polarization', 'returns': 'CpuPolarizationInfo',
+ 'features': [ 'unstable' ],
+ 'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
+}
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index 69f31db4af..4f08bdeb2f 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -465,3 +465,11 @@ void qmp_set_cpu_topology(uint16_t core,
has_drawer, drawer, has_entitlement, entitlement,
has_dedicated, dedicated, errp);
}
+
+CpuPolarizationInfo *qmp_query_cpu_polarization(Error **errp)
+{
+ CpuPolarizationInfo *info = g_new0(CpuPolarizationInfo, 1);
+
+ info->polarization = s390_topology.polarization;
+ return info;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 13/20] docs/s390x/cpu topology: document s390x cpu topology
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (11 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-05 8:41 ` Thomas Huth
2023-06-30 9:17 ` [PATCH v21 14/20] tests/avocado: s390x cpu topology core Pierre Morel
` (7 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
Add some basic examples for the definition of cpu topology
in s390x.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
MAINTAINERS | 2 +
docs/devel/index-internals.rst | 1 +
docs/devel/s390-cpu-topology.rst | 170 ++++++++++++++++++++
docs/system/s390x/cpu-topology.rst | 240 +++++++++++++++++++++++++++++
docs/system/target-s390x.rst | 1 +
5 files changed, 414 insertions(+)
create mode 100644 docs/devel/s390-cpu-topology.rst
create mode 100644 docs/system/s390x/cpu-topology.rst
diff --git a/MAINTAINERS b/MAINTAINERS
index b8d3e8815c..76f236564c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1703,6 +1703,8 @@ S: Supported
F: include/hw/s390x/cpu-topology.h
F: hw/s390x/cpu-topology.c
F: target/s390x/kvm/stsi-topology.c
+F: docs/devel/s390-cpu-topology.rst
+F: docs/system/s390x/cpu-topology.rst
X86 Machines
------------
diff --git a/docs/devel/index-internals.rst b/docs/devel/index-internals.rst
index e1a93df263..6f81df92bc 100644
--- a/docs/devel/index-internals.rst
+++ b/docs/devel/index-internals.rst
@@ -14,6 +14,7 @@ Details about QEMU's various subsystems including how to add features to them.
migration
multi-process
reset
+ s390-cpu-topology
s390-dasd-ipl
tracing
vfio-migration
diff --git a/docs/devel/s390-cpu-topology.rst b/docs/devel/s390-cpu-topology.rst
new file mode 100644
index 0000000000..cd36476011
--- /dev/null
+++ b/docs/devel/s390-cpu-topology.rst
@@ -0,0 +1,170 @@
+QAPI interface for S390 CPU topology
+====================================
+
+Let's start QEMU with the following command defining 4 CPUs,
+CPU[0] defined by the -smp argument will have default values:
+
+.. code-block:: bash
+
+ qemu-system-s390x \
+ -enable-kvm \
+ -cpu z14,ctop=on \
+ -smp 1,drawers=3,books=3,sockets=2,cores=2,maxcpus=36 \
+ \
+ -device z14-s390x-cpu,core-id=19,entitlement=high \
+ -device z14-s390x-cpu,core-id=11,entitlement=low \
+ -device z14-s390x-cpu,core-id=112,entitlement=high \
+ ...
+
+and see the result when using the QAPI interface.
+
+Addons to query-cpus-fast
+-------------------------
+
+The command query-cpus-fast allows to query the topology tree and
+modifiers for all configured vCPUs.
+
+.. code-block:: QMP
+
+ { "execute": "query-cpus-fast" }
+ {
+ "return": [
+ {
+ "dedicated": false,
+ "thread-id": 536993,
+ "props": {
+ "core-id": 0,
+ "socket-id": 0,
+ "drawer-id": 0,
+ "book-id": 0
+ },
+ "cpu-state": "operating",
+ "entitlement": "medium",
+ "qom-path": "/machine/unattached/device[0]",
+ "cpu-index": 0,
+ "target": "s390x"
+ },
+ {
+ "dedicated": false,
+ "thread-id": 537003,
+ "props": {
+ "core-id": 19,
+ "socket-id": 1,
+ "drawer-id": 0,
+ "book-id": 2
+ },
+ "cpu-state": "operating",
+ "entitlement": "high",
+ "qom-path": "/machine/peripheral-anon/device[0]",
+ "cpu-index": 19,
+ "target": "s390x"
+ },
+ {
+ "dedicated": false,
+ "thread-id": 537004,
+ "props": {
+ "core-id": 11,
+ "socket-id": 1,
+ "drawer-id": 0,
+ "book-id": 1
+ },
+ "cpu-state": "operating",
+ "entitlement": "low",
+ "qom-path": "/machine/peripheral-anon/device[1]",
+ "cpu-index": 11,
+ "target": "s390x"
+ },
+ {
+ "dedicated": true,
+ "thread-id": 537005,
+ "props": {
+ "core-id": 112,
+ "socket-id": 0,
+ "drawer-id": 3,
+ "book-id": 2
+ },
+ "cpu-state": "operating",
+ "entitlement": "high",
+ "qom-path": "/machine/peripheral-anon/device[2]",
+ "cpu-index": 112,
+ "target": "s390x"
+ }
+ ]
+ }
+
+
+QAPI command: set-cpu-topology
+------------------------------
+
+The command set-cpu-topology allows to modify the topology tree
+or the topology modifiers of a vCPU in the configuration.
+
+.. code-block:: QMP
+
+ { "execute": "set-cpu-topology",
+ "arguments": {
+ "core-id": 11,
+ "socket-id": 0,
+ "book-id": 0,
+ "drawer-id": 0,
+ "entitlement": "low",
+ "dedicated": false
+ }
+ }
+ {"return": {}}
+
+The core-id parameter is the only non optional parameter and every
+unspecified parameter keeps its previous value.
+
+QAPI event CPU_POLARIZATION_CHANGE
+----------------------------------
+
+When a guest is requests a modification of the polarization,
+QEMU sends a CPU_POLARIZATION_CHANGE event.
+
+When requesting the change, the guest only specifies horizontal or
+vertical polarization.
+It is the job of the upper layer to set the dedication and fine grained
+vertical entitlement in response to this event.
+
+Note that a vertical polarized dedicated vCPU can only have a high
+entitlement, this gives 6 possibilities for vCPU entitlement:
+
+- Horizontal
+- Horizontal dedicated
+- Vertical low
+- Vertical medium
+- Vertical high
+- Vertical high dedicated
+
+Example of the event received when the guest issues the CPU instruction
+Perform Topology Function PTF(0) to request an horizontal polarization:
+
+.. code-block:: QMP
+
+ {
+ "timestamp": {
+ "seconds": 1687870305,
+ "microseconds": 566299
+ },
+ "event": "CPU_POLARIZATION_CHANGE",
+ "data": {
+ "polarization": "horizontal"
+ }
+ }
+
+QAPI query command: query-cpu-polarization
+------------------------------------------
+
+The query command query-cpu-polarization returns the current
+CPU polarization of the machine.
+In the case the guest issued a PTF(1) to request a vertical polarization:
+
+.. code-block:: QMP
+
+ { "execute": "query-cpu-polarization" }
+ {
+ "return": {
+ "polarization": "vertical"
+ }
+ }
diff --git a/docs/system/s390x/cpu-topology.rst b/docs/system/s390x/cpu-topology.rst
new file mode 100644
index 0000000000..0535a5d883
--- /dev/null
+++ b/docs/system/s390x/cpu-topology.rst
@@ -0,0 +1,240 @@
+CPU topology on s390x
+=====================
+
+Since QEMU 8.1, CPU topology on s390x provides up to 3 levels of
+topology containers: drawers, books, sockets, defining a tree shaped
+hierarchy.
+
+The socket container contains one or more CPU entries.
+Each of these CPU entries consists of a bitmap and three CPU attributes:
+
+- CPU type
+- entitlement
+- dedication
+
+Each bit set in the bitmap correspond to the core-id of a vCPU with
+matching the three attribute.
+
+This documentation provide general information on S390 CPU topology,
+how to enable it and on the new CPU attributes.
+For information on how to modify the S390 CPU topology and on how to
+monitor the polarization change see ``Developer Information``.
+
+Prerequisites
+-------------
+
+To use the CPU topology, you need to run with KVM on a s390x host that
+uses the Linux kernel v6.0 or newer (which provide the so-called
+``KVM_CAP_S390_CPU_TOPOLOGY`` capability that allows QEMU to signal the
+CPU topology facility via the so-called STFLE bit 11 to the VM).
+
+Enabling CPU topology
+---------------------
+
+Currently, CPU topology is only enabled in the host model by default.
+
+Enabling CPU topology in a CPU model is done by setting the CPU flag
+``ctop`` to ``on`` like in:
+
+.. code-block:: bash
+
+ -cpu gen16b,ctop=on
+
+Having the topology disabled by default allows migration between
+old and new QEMU without adding new flags.
+
+Default topology usage
+----------------------
+
+The CPU topology can be specified on the QEMU command line
+with the ``-smp`` or the ``-device`` QEMU command arguments.
+
+Note also that since 7.2 threads are no longer supported in the topology
+and the ``-smp`` command line argument accepts only ``threads=1``.
+
+If none of the containers attributes (drawers, books, sockets) are
+specified for the ``-smp`` flag, the number of these containers
+is ``1`` .
+
+.. code-block:: bash
+
+ -smp cpus=5,drawer=1,books=1,sockets=8,cores=4,maxcpus=32
+
+or
+
+.. code-block:: bash
+
+ -smp cpus=5,sockets=8,cores=4,maxcpus=32
+
+When a CPU is defined by the ``-smp`` command argument, its position
+inside the topology is calculated by adding the CPUs to the topology
+based on the core-id starting with core-0 at position 0 of socket-0,
+book-0, drawer-0 and filling all CPUs of socket-0 before to fill socket-1
+of book-0 and so on up to the last socket of the last book of the last
+drawer.
+
+When a CPU is defined by the ``-device`` command argument, the
+tree topology attributes must be all defined or all not defined.
+
+.. code-block:: bash
+
+ -device gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=1
+
+or
+
+.. code-block:: bash
+
+ -device gen16b-s390x-cpu,core-id=1,dedicated=true
+
+If none of the tree attributes (drawer, book, sockets), are specified
+for the ``-device`` argument, as for all CPUs defined with the ``-smp``
+command argument the topology tree attributes will be set by simply
+adding the CPUs to the topology based on the core-id starting with
+core-0 at position 0 of socket-0, book-0, drawer-0.
+
+QEMU will not try to solve collisions and will report an error if the
+CPU topology, explicitly or implicitly defined on a ``-device``
+argument collides with the definition of a CPU implicitely defined
+on the ``-smp`` argument.
+
+When the topology modifier attributes are not defined for the
+``-device`` command argument they takes following default values:
+
+- dedicated: ``false``
+- entitlement: ``medium``
+
+
+Hot plug
+++++++++
+
+New CPUs can be plugged using the device_add hmp command as in:
+
+.. code-block:: bash
+
+ (qemu) device_add gen16b-s390x-cpu,core-id=9
+
+The same placement of the CPU is derived from the core-id as described above.
+
+The topology can of course be fully defined:
+
+.. code-block:: bash
+
+ (qemu) device_add gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=1
+
+
+Examples
+++++++++
+
+In the following machine we define 8 sockets with 4 cores each.
+
+.. code-block:: bash
+
+ $ qemu-system-s390x -m 2G \
+ -cpu gen16b,ctop=on \
+ -smp cpus=5,sockets=8,cores=4,maxcpus=32 \
+ -device host-s390x-cpu,core-id=14 \
+
+A new CPUs can be plugged using the device_add hmp command as before:
+
+.. code-block:: bash
+
+ (qemu) device_add gen16b-s390x-cpu,core-id=9
+
+The core-id defines the placement of the core in the topology by
+starting with core 0 in socket 0 up to maxcpus.
+
+In the example above:
+
+* There are 5 CPUs provided to the guest with the ``-smp`` command line
+ They will take the core-ids 0,1,2,3,4
+ As we have 4 cores in a socket, we have 4 CPUs provided
+ to the guest in socket 0, with core-ids 0,1,2,3.
+ The last cpu, with core-id 4, will be on socket 1.
+
+* the core with ID 14 provided by the ``-device`` command line will
+ be placed in socket 3, with core-id 14
+
+* the core with ID 9 provided by the ``device_add`` qmp command will
+ be placed in socket 2, with core-id 9
+
+
+Polarization, entitlement and dedication
+----------------------------------------
+
+Polarization
+++++++++++++
+
+The polarization is an indication given by the ``guest`` to the host
+that it is able to make use of CPU provisioning information.
+The guest indicates the polarization by using the PTF instruction.
+
+Polarization is define two models of CPU provisioning: horizontal
+and vertical.
+
+The horizontal polarization is the default model on boot and after
+subsystem reset in which the guest considers all vCPUs being having
+an equal provisioning of CPUs by the host.
+
+In the vertical polarization model the guest can make use of the
+vCPU entitlement information provided by the host to optimize
+kernel thread scheduling.
+
+A subsystem reset puts all vCPU of the configuration into the
+horizontal polarization.
+
+Entitlement
++++++++++++
+
+The vertical polarization specifies that the guest's vCPU can get
+different real CPU provisions:
+
+- a vCPU with vertical high entitlement specifies that this
+ vCPU gets 100% of the real CPU provisioning.
+
+- a vCPU with vertical medium entitlement specifies that this
+ vCPU shares the real CPU with other vCPUs.
+
+- a vCPU with vertical low entitlement specifies that this
+ vCPU only gets real CPU provisioning when no other vCPUs needs it.
+
+In the case a vCPU with vertical high entitlement does not use
+the real CPU, the unused "slack" can be dispatched to other vCPU
+with medium or low entitlement.
+
+The upper level specifies a vCPU as ``dedicated`` when the vCPU is
+fully dedicated to a single real CPU.
+
+The dedicated bit is an indication of affinity of a vCPU for a real CPU
+while the entitlement indicates the sharing or exclusivity of use.
+
+Defining the topology on command line
+-------------------------------------
+
+The topology can entirely be defined using -device cpu statements,
+with the exception of CPU 0 which must be defined with the -smp
+argument.
+
+For example, here we set the position of the cores 1,2,3 to
+drawer 1, book 1, socket 2 and cores 0,9 and 14 to drawer 0,
+book 0, socket 0 without defining entitlement or dedication.
+The core 4, will be set on its default position on socket 1
+(since we have 4 core per socket) and we define it as dedicated and
+with vertical high entitlement.
+
+.. code-block:: bash
+
+ $ qemu-system-s390x -m 2G \
+ -cpu gen16b,ctop=on \
+ -smp cpus=1,sockets=8,cores=4,maxcpus=32 \
+ \
+ -device gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=1 \
+ -device gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=2 \
+ -device gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=3 \
+ \
+ -device gen16b-s390x-cpu,drawer-id=0,book-id=0,socket-id=0,core-id=9 \
+ -device gen16b-s390x-cpu,drawer-id=0,book-id=0,socket-id=0,core-id=14 \
+ \
+ -device gen16b-s390x-cpu,core-id=4,dedicated=on,entitlement=high
+
+The entitlement defined for the CPU 4, will only be used after the guest
+successfully enables vertical polarization by using the PTF instruction.
diff --git a/docs/system/target-s390x.rst b/docs/system/target-s390x.rst
index f6f11433c7..94c981e732 100644
--- a/docs/system/target-s390x.rst
+++ b/docs/system/target-s390x.rst
@@ -34,3 +34,4 @@ Architectural features
.. toctree::
s390x/bootdevices
s390x/protvirt
+ s390x/cpu-topology
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 14/20] tests/avocado: s390x cpu topology core
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (12 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 13/20] docs/s390x/cpu topology: document s390x cpu topology Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-04 13:14 ` Thomas Huth
2023-07-12 20:00 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 15/20] tests/avocado: s390x cpu topology polarisation Pierre Morel
` (6 subsequent siblings)
20 siblings, 2 replies; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
Introduction of the s390x cpu topology core functions and
basic tests.
We test the corelation between the command line and
the QMP results in query-cpus-fast for various CPU topology.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
MAINTAINERS | 1 +
tests/avocado/s390_topology.py | 196 +++++++++++++++++++++++++++++++++
2 files changed, 197 insertions(+)
create mode 100644 tests/avocado/s390_topology.py
diff --git a/MAINTAINERS b/MAINTAINERS
index 76f236564c..12d0d7bd91 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1705,6 +1705,7 @@ F: hw/s390x/cpu-topology.c
F: target/s390x/kvm/stsi-topology.c
F: docs/devel/s390-cpu-topology.rst
F: docs/system/s390x/cpu-topology.rst
+F: tests/avocado/s390_topology.py
X86 Machines
------------
diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
new file mode 100644
index 0000000000..1758ec1f13
--- /dev/null
+++ b/tests/avocado/s390_topology.py
@@ -0,0 +1,196 @@
+# Functional test that boots a Linux kernel and checks the console
+#
+# Copyright IBM Corp. 2023
+#
+# Author:
+# Pierre Morel <pmorel@linux.ibm.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later. See the COPYING file in the top-level directory.
+
+import os
+import shutil
+import time
+
+from avocado_qemu import QemuSystemTest
+from avocado_qemu import exec_command
+from avocado_qemu import exec_command_and_wait_for_pattern
+from avocado_qemu import interrupt_interactive_console_until_pattern
+from avocado_qemu import wait_for_console_pattern
+from avocado.utils import process
+from avocado.utils import archive
+
+
+class S390CPUTopology(QemuSystemTest):
+ """
+ S390x CPU topology consist of 4 topology layers, from bottom to top,
+ the cores, sockets, books and drawers and 2 modifiers attributes,
+ the entitlement and the dedication.
+ See: docs/system/s390x/cpu-topology.rst.
+
+ S390x CPU topology is setup in different ways:
+ - implicitely from the '-smp' argument by completing each topology
+ level one after the other begining with drawer 0, book 0 and socket 0.
+ - explicitely from the '-device' argument on the QEMU command line
+ - explicitely by hotplug of a new CPU using QMP or HMP
+ - it is modified by using QMP 'set-cpu-topology'
+
+ The S390x modifier attribute entitlement depends on the machine
+ polarization, which can be horizontal or vertical.
+ The polarization is changed on a request from the guest.
+ """
+ timeout = 90
+
+ KERNEL_COMMON_COMMAND_LINE = ('printk.time=0 '
+ 'root=/dev/ram '
+ 'selinux=0 '
+ 'rdinit=/bin/sh')
+
+ def wait_until_booted(self):
+ wait_for_console_pattern(self, 'no job control',
+ failure_message='Kernel panic - not syncing',
+ vm=None)
+
+ def check_topology(self, c, s, b, d, e, t):
+ res = self.vm.qmp('query-cpus-fast')
+ cpus = res['return']
+ for cpu in cpus:
+ core = cpu['props']['core-id']
+ socket = cpu['props']['socket-id']
+ book = cpu['props']['book-id']
+ drawer = cpu['props']['drawer-id']
+ entitlement = cpu['entitlement']
+ dedicated = cpu['dedicated']
+ if core == c:
+ self.assertEqual(drawer, d)
+ self.assertEqual(book, b)
+ self.assertEqual(socket, s)
+ self.assertEqual(entitlement, e)
+ self.assertEqual(dedicated, t)
+
+ def kernel_init(self):
+ """
+ We need a kernel supporting the CPU topology.
+ We need a minimal root filesystem with a shell.
+ """
+ kernel_url = ('https://archives.fedoraproject.org/pub/archive'
+ '/fedora-secondary/releases/35/Server/s390x/os'
+ '/images/kernel.img')
+ kernel_hash = '0d1aaaf303f07cf0160c8c48e56fe638'
+ kernel_path = self.fetch_asset(kernel_url, algorithm='md5',
+ asset_hash=kernel_hash)
+
+ initrd_url = ('https://archives.fedoraproject.org/pub/archive'
+ '/fedora-secondary/releases/35/Server/s390x/os'
+ '/images/initrd.img')
+ initrd_hash = 'a122057d95725ac030e2ec51df46e172'
+ initrd_path_xz = self.fetch_asset(initrd_url, algorithm='md5',
+ asset_hash=initrd_hash)
+ initrd_path = os.path.join(self.workdir, 'initrd-raw.img')
+ archive.lzma_uncompress(initrd_path_xz, initrd_path)
+
+ self.vm.set_console()
+ kernel_command_line = self.KERNEL_COMMON_COMMAND_LINE
+ self.vm.add_args('-nographic',
+ '-enable-kvm',
+ '-cpu', 'max,ctop=on',
+ '-m', '512',
+ '-kernel', kernel_path,
+ '-initrd', initrd_path,
+ '-append', kernel_command_line)
+
+ def test_single(self):
+ """
+ This test checks the simplest topology with a single CPU.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.launch()
+ self.wait_until_booted()
+ self.check_topology(0, 0, 0, 0, 'medium', False)
+
+ def test_default(self):
+ """
+ This test checks the implicit topology.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.add_args('-smp',
+ '13,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
+ self.vm.launch()
+ self.wait_until_booted()
+ self.check_topology(0, 0, 0, 0, 'medium', False)
+ self.check_topology(1, 0, 0, 0, 'medium', False)
+ self.check_topology(2, 1, 0, 0, 'medium', False)
+ self.check_topology(3, 1, 0, 0, 'medium', False)
+ self.check_topology(4, 2, 0, 0, 'medium', False)
+ self.check_topology(5, 2, 0, 0, 'medium', False)
+ self.check_topology(6, 0, 1, 0, 'medium', False)
+ self.check_topology(7, 0, 1, 0, 'medium', False)
+ self.check_topology(8, 1, 1, 0, 'medium', False)
+ self.check_topology(9, 1, 1, 0, 'medium', False)
+ self.check_topology(10, 2, 1, 0, 'medium', False)
+ self.check_topology(11, 2, 1, 0, 'medium', False)
+ self.check_topology(12, 0, 0, 1, 'medium', False)
+
+ def test_move(self):
+ """
+ This test checks the topology modification by moving a CPU
+ to another socket: CPU 0 is moved from socket 0 to socket 2.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.add_args('-smp',
+ '1,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.check_topology(0, 0, 0, 0, 'medium', False)
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'socket-id': 2, 'entitlement': 'low'})
+ self.assertEqual(res['return'], {})
+ self.check_topology(0, 2, 0, 0, 'low', False)
+
+ def test_hotplug_full(self):
+ """
+ This test verifies that a hotplugged defined with '-device'
+ command line argument finds its right place inside the topology.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.add_args('-smp',
+ '1,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
+ self.vm.add_args('-device', 'max-s390x-cpu,core-id=10')
+ self.vm.add_args('-device',
+ 'max-s390x-cpu,'
+ 'core-id=1,socket-id=0,book-id=1,drawer-id=1,entitlement=low')
+ self.vm.add_args('-device',
+ 'max-s390x-cpu,'
+ 'core-id=2,socket-id=0,book-id=1,drawer-id=1,entitlement=medium')
+ self.vm.add_args('-device',
+ 'max-s390x-cpu,'
+ 'core-id=3,socket-id=1,book-id=1,drawer-id=1,entitlement=high')
+ self.vm.add_args('-device',
+ 'max-s390x-cpu,'
+ 'core-id=4,socket-id=1,book-id=1,drawer-id=1')
+ self.vm.add_args('-device',
+ 'max-s390x-cpu,'
+ 'core-id=5,socket-id=2,book-id=1,drawer-id=1,dedicated=true')
+
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.check_topology(10, 2, 1, 0, 'medium', False)
+ self.check_topology(1, 0, 1, 1, 'low', False)
+ self.check_topology(2, 0, 1, 1, 'medium', False)
+ self.check_topology(3, 1, 1, 1, 'high', False)
+ self.check_topology(4, 1, 1, 1, 'medium', False)
+ self.check_topology(5, 2, 1, 1, 'high', True)
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 15/20] tests/avocado: s390x cpu topology polarisation
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (13 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 14/20] tests/avocado: s390x cpu topology core Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-05 8:53 ` Thomas Huth
2023-06-30 9:17 ` [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests Pierre Morel
` (5 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
Polarization is changed on a request from the guest.
Let's verify the polarization is accordingly set by QEMU.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
tests/avocado/s390_topology.py | 46 ++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
index 1758ec1f13..2cf731cb1d 100644
--- a/tests/avocado/s390_topology.py
+++ b/tests/avocado/s390_topology.py
@@ -40,6 +40,7 @@ class S390CPUTopology(QemuSystemTest):
The polarization is changed on a request from the guest.
"""
timeout = 90
+ event_timeout = 1
KERNEL_COMMON_COMMAND_LINE = ('printk.time=0 '
'root=/dev/ram '
@@ -99,6 +100,15 @@ def kernel_init(self):
'-initrd', initrd_path,
'-append', kernel_command_line)
+ def system_init(self):
+ self.log.info("System init")
+ exec_command(self, 'mount proc -t proc /proc')
+ time.sleep(0.2)
+ exec_command(self, 'mount sys -t sysfs /sys')
+ time.sleep(0.2)
+ exec_command_and_wait_for_pattern(self,
+ '/bin/cat /sys/devices/system/cpu/dispatching', '0')
+
def test_single(self):
"""
This test checks the simplest topology with a single CPU.
@@ -194,3 +204,39 @@ def test_hotplug_full(self):
self.check_topology(3, 1, 1, 1, 'high', False)
self.check_topology(4, 1, 1, 1, 'medium', False)
self.check_topology(5, 2, 1, 1, 'high', True)
+
+
+ def guest_set_dispatching(self, dispatching):
+ exec_command(self,
+ f'echo {dispatching} > /sys/devices/system/cpu/dispatching')
+ self.vm.event_wait('CPU_POLARIZATION_CHANGE', self.event_timeout)
+ exec_command_and_wait_for_pattern(self,
+ '/bin/cat /sys/devices/system/cpu/dispatching', dispatching)
+
+
+ def test_polarisation(self):
+ """
+ This test verifies that QEMU modifies the entitlement change after
+ several guest polarization change requests.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.system_init()
+ res = self.vm.qmp('query-cpu-polarization')
+ self.assertEqual(res['return']['polarization'], 'horizontal')
+ self.check_topology(0, 0, 0, 0, 'medium', False)
+
+ self.guest_set_dispatching('1');
+ res = self.vm.qmp('query-cpu-polarization')
+ self.assertEqual(res['return']['polarization'], 'vertical')
+ self.check_topology(0, 0, 0, 0, 'medium', False)
+
+ self.guest_set_dispatching('0');
+ res = self.vm.qmp('query-cpu-polarization')
+ self.assertEqual(res['return']['polarization'], 'horizontal')
+ self.check_topology(0, 0, 0, 0, 'medium', False)
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (14 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 15/20] tests/avocado: s390x cpu topology polarisation Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-05 10:22 ` Thomas Huth
2023-06-30 9:17 ` [PATCH v21 17/20] tests/avocado: s390x cpu topology test dedicated CPU Pierre Morel
` (4 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
This test takes care to check the changes on different entitlements
when the guest requests a polarization change.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
tests/avocado/s390_topology.py | 47 ++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
index 2cf731cb1d..4855e5d7e4 100644
--- a/tests/avocado/s390_topology.py
+++ b/tests/avocado/s390_topology.py
@@ -240,3 +240,50 @@ def test_polarisation(self):
res = self.vm.qmp('query-cpu-polarization')
self.assertEqual(res['return']['polarization'], 'horizontal')
self.check_topology(0, 0, 0, 0, 'medium', False)
+
+ def test_entitlement(self):
+ """
+ This test verifies that QEMU modifies the polarization
+ after a guest request.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.add_args('-smp',
+ '4,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.system_init()
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'entitlement': 'low'})
+ self.assertEqual(res['return'], {})
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 1, 'entitlement': 'medium'})
+ self.assertEqual(res['return'], {})
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 2, 'entitlement': 'high'})
+ self.assertEqual(res['return'], {})
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 3, 'entitlement': 'high'})
+ self.assertEqual(res['return'], {})
+ self.check_topology(0, 0, 0, 0, 'low', False)
+ self.check_topology(1, 0, 0, 0, 'medium', False)
+ self.check_topology(2, 1, 0, 0, 'high', False)
+ self.check_topology(3, 1, 0, 0, 'high', False)
+
+ self.guest_set_dispatching('1');
+
+ self.check_topology(0, 0, 0, 0, 'low', False)
+ self.check_topology(1, 0, 0, 0, 'medium', False)
+ self.check_topology(2, 1, 0, 0, 'high', False)
+ self.check_topology(3, 1, 0, 0, 'high', False)
+
+ self.guest_set_dispatching('0');
+
+ self.check_topology(0, 0, 0, 0, 'low', False)
+ self.check_topology(1, 0, 0, 0, 'medium', False)
+ self.check_topology(2, 1, 0, 0, 'high', False)
+ self.check_topology(3, 1, 0, 0, 'high', False)
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 17/20] tests/avocado: s390x cpu topology test dedicated CPU
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (15 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-19 14:09 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 18/20] tests/avocado: s390x cpu topology test socket full Pierre Morel
` (3 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
A dedicated CPU in vertical polarization can only have
a high entitlement.
Let's check this.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
tests/avocado/s390_topology.py | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
index 4855e5d7e4..cba44bec91 100644
--- a/tests/avocado/s390_topology.py
+++ b/tests/avocado/s390_topology.py
@@ -287,3 +287,31 @@ def test_entitlement(self):
self.check_topology(1, 0, 0, 0, 'medium', False)
self.check_topology(2, 1, 0, 0, 'high', False)
self.check_topology(3, 1, 0, 0, 'high', False)
+
+ def test_dedicated(self):
+ """
+ This test verifies that QEMU modifies the entitlement change correctly
+ for a dedicated CPU after several guest polarization change requests.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.system_init()
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'dedicated': True})
+ self.assertEqual(res['return'], {})
+
+ self.check_topology(0, 0, 0, 0, 'high', True)
+
+ self.guest_set_dispatching('1');
+
+ self.check_topology(0, 0, 0, 0, 'high', True)
+
+ self.guest_set_dispatching('0');
+
+ self.check_topology(0, 0, 0, 0, 'high', True)
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 18/20] tests/avocado: s390x cpu topology test socket full
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (16 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 17/20] tests/avocado: s390x cpu topology test dedicated CPU Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-05 10:26 ` Thomas Huth
2023-06-30 9:17 ` [PATCH v21 19/20] tests/avocado: s390x cpu topology dedicated errors Pierre Morel
` (2 subsequent siblings)
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
This test verifies that QMP set-cpu-topology does not accept
to overload a socket.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
tests/avocado/s390_topology.py | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
index cba44bec91..0003b30702 100644
--- a/tests/avocado/s390_topology.py
+++ b/tests/avocado/s390_topology.py
@@ -315,3 +315,28 @@ def test_dedicated(self):
self.guest_set_dispatching('0');
self.check_topology(0, 0, 0, 0, 'high', True)
+
+ def test_socket_full(self):
+ """
+ This test verifies that QEMU does not accept to overload a socket.
+ The socket-id 0 on book-id 0 already contains CPUs 0 and 1 and can
+ not accept any new CPU while socket-id 0 on book-id 1 is free.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.add_args('-smp',
+ '3,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.system_init()
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 2, 'socket-id': 0, 'book-id': 0})
+ self.assertEqual(res['error']['class'], 'GenericError')
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 2, 'socket-id': 0, 'book-id': 1})
+ self.assertEqual(res['return'], {})
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 19/20] tests/avocado: s390x cpu topology dedicated errors
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (17 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 18/20] tests/avocado: s390x cpu topology test socket full Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-05 10:28 ` Thomas Huth
2023-06-30 9:17 ` [PATCH v21 20/20] tests/avocado: s390x cpu topology bad move Pierre Morel
2023-07-05 10:02 ` [PATCH v21 00/20] s390x: CPU Topology Thomas Huth
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
Let's test that QEMU refuses to setup a dedicated CPU with
low or medium entitlement.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
tests/avocado/s390_topology.py | 48 ++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
index 0003b30702..99d9508cef 100644
--- a/tests/avocado/s390_topology.py
+++ b/tests/avocado/s390_topology.py
@@ -340,3 +340,51 @@ def test_socket_full(self):
res = self.vm.qmp('set-cpu-topology',
{'core-id': 2, 'socket-id': 0, 'book-id': 1})
self.assertEqual(res['return'], {})
+
+ def test_dedicated_error(self):
+ """
+ This test verifies that QEMU refuses to lower the entitlement
+ of a dedicated CPU
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.system_init()
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'dedicated': True})
+ self.assertEqual(res['return'], {})
+
+ self.check_topology(0, 0, 0, 0, 'high', True)
+
+ self.guest_set_dispatching('1');
+
+ self.check_topology(0, 0, 0, 0, 'high', True)
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'entitlement': 'low', 'dedicated': True})
+ self.assertEqual(res['error']['class'], 'GenericError')
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'entitlement': 'low'})
+ self.assertEqual(res['error']['class'], 'GenericError')
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'entitlement': 'medium', 'dedicated': True})
+ self.assertEqual(res['error']['class'], 'GenericError')
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'entitlement': 'medium'})
+ self.assertEqual(res['error']['class'], 'GenericError')
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'entitlement': 'low', 'dedicated': False})
+ self.assertEqual(res['return'], {})
+
+ res = self.vm.qmp('set-cpu-topology',
+ {'core-id': 0, 'entitlement': 'medium', 'dedicated': False})
+ self.assertEqual(res['return'], {})
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* [PATCH v21 20/20] tests/avocado: s390x cpu topology bad move
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (18 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 19/20] tests/avocado: s390x cpu topology dedicated errors Pierre Morel
@ 2023-06-30 9:17 ` Pierre Morel
2023-07-05 10:32 ` Thomas Huth
2023-07-05 10:02 ` [PATCH v21 00/20] s390x: CPU Topology Thomas Huth
20 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-06-30 9:17 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
This test verifies that QEMU refuses to move a CPU to an
unexistant location.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
tests/avocado/s390_topology.py | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
index 99d9508cef..ea39168b53 100644
--- a/tests/avocado/s390_topology.py
+++ b/tests/avocado/s390_topology.py
@@ -388,3 +388,28 @@ def test_dedicated_error(self):
res = self.vm.qmp('set-cpu-topology',
{'core-id': 0, 'entitlement': 'medium', 'dedicated': False})
self.assertEqual(res['return'], {})
+
+ def test_move_error(self):
+ """
+ This test verifies that QEMU refuses to move a CPU to an
+ unexistant location
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.system_init()
+
+ res = self.vm.qmp('set-cpu-topology', {'core-id': 0, 'drawer-id': 1})
+ self.assertEqual(res['error']['class'], 'GenericError')
+
+ res = self.vm.qmp('set-cpu-topology', {'core-id': 0, 'book-id': 1})
+ self.assertEqual(res['error']['class'], 'GenericError')
+
+ res = self.vm.qmp('set-cpu-topology', {'core-id': 0, 'socket-id': 1})
+ self.assertEqual(res['error']['class'], 'GenericError')
+
+ self.check_topology(0, 0, 0, 0, 'medium', False)
--
2.31.1
^ permalink raw reply related [flat|nested] 78+ messages in thread
* Re: [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug
2023-06-30 9:17 ` [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug Pierre Morel
@ 2023-07-04 10:32 ` Thomas Huth
2023-07-12 11:20 ` Pierre Morel
2023-07-24 20:19 ` Nina Schoetterl-Glausch
1 sibling, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 10:32 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> The topology information are attributes of the CPU and are
> specified during the CPU device creation.
>
> On hot plug we:
> - calculate the default values for the topology for drawers,
> books and sockets in the case they are not specified.
> - verify the CPU attributes
> - check that we have still room on the desired socket
>
> The possibility to insert a CPU in a mask is dependent on the
> number of cores allowed in a socket, a book or a drawer, the
> checking is done during the hot plug of the CPU to have an
> immediate answer.
>
> If the complete topology is not specified, the core is added
> in the physical topology based on its core ID and it gets
> defaults values for the modifier attributes.
>
> This way, starting QEMU without specifying the topology can
> still get some advantage of the CPU topology.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
...
> diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h
> new file mode 100644
> index 0000000000..9164ac00a7
> --- /dev/null
> +++ b/include/hw/s390x/cpu-topology.h
> @@ -0,0 +1,54 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * CPU Topology
> + *
> + * Copyright IBM Corp. 2022,2023
Nit: Add a space after the comma ?
> + * Author(s): Pierre Morel <pmorel@linux.ibm.com>
> + *
> + */
> +#ifndef HW_S390X_CPU_TOPOLOGY_H
> +#define HW_S390X_CPU_TOPOLOGY_H
> +
> +#ifndef CONFIG_USER_ONLY
> +
> +#include "qemu/queue.h"
> +#include "hw/boards.h"
> +#include "qapi/qapi-types-machine-target.h"
> +
> +typedef struct S390Topology {
> + uint8_t *cores_per_socket;
> +} S390Topology;
So S390Topology has only one entry, "cores_per_socket" here...
...
> diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
> new file mode 100644
> index 0000000000..b163c17f8f
> --- /dev/null
> +++ b/hw/s390x/cpu-topology.c
> @@ -0,0 +1,264 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * CPU Topology
> + *
> + * Copyright IBM Corp. 2022,2023
> + * Author(s): Pierre Morel <pmorel@linux.ibm.com>
> + *
> + * S390 topology handling can be divided in two parts:
> + *
> + * - The first part in this file is taking care of all common functions
> + * used by KVM and TCG to create and modify the topology.
> + *
> + * - The second part, building the topology information data for the
> + * guest with CPU and KVM specificity will be implemented inside
> + * the target/s390/kvm sub tree.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qapi/error.h"
> +#include "qemu/error-report.h"
> +#include "hw/qdev-properties.h"
> +#include "hw/boards.h"
> +#include "target/s390x/cpu.h"
> +#include "hw/s390x/s390-virtio-ccw.h"
> +#include "hw/s390x/cpu-topology.h"
> +
> +/*
> + * s390_topology is used to keep the topology information.
> + * .cores_per_socket: tracks information on the count of cores
> + * per socket.
> + * .smp: keeps track of the machine topology.
> + *
... but the description talks about ".smp" here, too, which never seems to
be added. Leftover from a previous iteration?
(also: please remove the empty line at the end of the comment)
> + */
> +S390Topology s390_topology = {
> + /* will be initialized after the cpu model is realized */
> + .cores_per_socket = NULL,
> +};
> +
> +/**
> + * s390_socket_nb:
> + * @cpu: s390x CPU
> + *
> + * Returns the socket number used inside the cores_per_socket array
> + * for a topology tree entry
> + */
> +static int __s390_socket_nb(int drawer_id, int book_id, int socket_id)
Please don't use function names starting with double underscores. This
namespace is reserved by the C standard.
Maybe "s390_socket_nb_from_ids" ?
> +{
> + return (drawer_id * current_machine->smp.books + book_id) *
> + current_machine->smp.sockets + socket_id;
> +}
> +
> +/**
> + * s390_socket_nb:
> + * @cpu: s390x CPU
> + *
> + * Returns the socket number used inside the cores_per_socket array
> + * for a cpu.
> + */
> +static int s390_socket_nb(S390CPU *cpu)
> +{
> + return __s390_socket_nb(cpu->env.drawer_id, cpu->env.book_id,
> + cpu->env.socket_id);
> +}
> +
> +/**
> + * s390_has_topology:
> + *
> + * Return value: if the topology is supported by the machine.
"Return: true if the topology is supported by the machine"
(QEMU uses kerneldoc style, so it's just "Return:" and not "Return value:",
see e.g. https://www.kernel.org/doc/html/latest/doc-guide/kernel-doc.html )
> + */
> +bool s390_has_topology(void)
> +{
> + return false;
> +}
> +
> +/**
> + * s390_topology_init:
> + * @ms: the machine state where the machine topology is defined
> + *
> + * Keep track of the machine topology.
> + *
> + * Allocate an array to keep the count of cores per socket.
> + * The index of the array starts at socket 0 from book 0 and
> + * drawer 0 up to the maximum allowed by the machine topology.
> + */
> +static void s390_topology_init(MachineState *ms)
> +{
> + CpuTopology *smp = &ms->smp;
> +
> + s390_topology.cores_per_socket = g_new0(uint8_t, smp->sockets *
> + smp->books * smp->drawers);
> +}
> +
> +/**
> + * s390_topology_cpu_default:
> + * @cpu: pointer to a S390CPU
> + * @errp: Error pointer
> + *
> + * Setup the default topology if no attributes are already set.
> + * Passing a CPU with some, but not all, attributes set is considered
> + * an error.
> + *
> + * The function calculates the (drawer_id, book_id, socket_id)
> + * topology by filling the cores starting from the first socket
> + * (0, 0, 0) up to the last (smp->drawers, smp->books, smp->sockets).
> + *
> + * CPU type and dedication have defaults values set in the
> + * s390x_cpu_properties, entitlement must be adjust depending on the
> + * dedication.
> + *
> + * Returns false if it is impossible to setup a default topology
> + * true otherwise.
> + */
> +static bool s390_topology_cpu_default(S390CPU *cpu, Error **errp)
> +{
> + CpuTopology *smp = ¤t_machine->smp;
> + CPUS390XState *env = &cpu->env;
> +
> + /* All geometry topology attributes must be set or all unset */
> + if ((env->socket_id < 0 || env->book_id < 0 || env->drawer_id < 0) &&
> + (env->socket_id >= 0 || env->book_id >= 0 || env->drawer_id >= 0)) {
> + error_setg(errp,
> + "Please define all or none of the topology geometry attributes");
> + return false;
> + }
> +
> + /* Check if one of the geometry topology is unset */
> + if (env->socket_id < 0) {
> + /* Calculate default geometry topology attributes */
> + env->socket_id = s390_std_socket(env->core_id, smp);
> + env->book_id = s390_std_book(env->core_id, smp);
> + env->drawer_id = s390_std_drawer(env->core_id, smp);
> + }
> +
> + /*
> + * When the user specifies the entitlement as 'auto' on the command line,
> + * qemu will set the entitlement as:
s/qemu/QEMU/
> + * Medium when the CPU is not dedicated.
> + * High when dedicated is true.
> + */
> + if (env->entitlement == S390_CPU_ENTITLEMENT_AUTO) {
> + if (env->dedicated) {
> + env->entitlement = S390_CPU_ENTITLEMENT_HIGH;
> + } else {
> + env->entitlement = S390_CPU_ENTITLEMENT_MEDIUM;
> + }
> + }
> + return true;
> +}
> +
> +/**
> + * s390_topology_check:
> + * @socket_id: socket to check
> + * @book_id: book to check
> + * @drawer_id: drawer to check
> + * @entitlement: entitlement to check
> + * @dedicated: dedication to check
> + * @errp: Error pointer
> + *
> + * The function checks if the topology
> + * attributes fits inside the system topology.
> + *
> + * Returns false if the specified topology does not match with
> + * the machine topology.
> + */
> +static bool s390_topology_check(uint16_t socket_id, uint16_t book_id,
> + uint16_t drawer_id, uint16_t entitlement,
> + bool dedicated, Error **errp)
> +{
> + CpuTopology *smp = ¤t_machine->smp;
> + ERRP_GUARD();
> +
> + if (socket_id >= smp->sockets) {
> + error_setg(errp, "Unavailable socket: %d", socket_id);
> + return false;
> + }
> + if (book_id >= smp->books) {
> + error_setg(errp, "Unavailable book: %d", book_id);
> + return false;
> + }
> + if (drawer_id >= smp->drawers) {
> + error_setg(errp, "Unavailable drawer: %d", drawer_id);
> + return false;
> + }
> + if (entitlement >= S390_CPU_ENTITLEMENT__MAX) {
> + error_setg(errp, "Unknown entitlement: %d", entitlement);
> + return false;
> + }
> + if (dedicated && (entitlement == S390_CPU_ENTITLEMENT_LOW ||
> + entitlement == S390_CPU_ENTITLEMENT_MEDIUM)) {
> + error_setg(errp, "A dedicated cpu implies high entitlement");
s/cpu/CPU/ ?
> + return false;
> + }
> + return true;
> +}
> +
> +/**
> + * s390_update_cpu_props:
> + * @ms: the machine state
> + * @cpu: the CPU for which to update the properties from the environment.
> + *
> + */
> +static void s390_update_cpu_props(MachineState *ms, S390CPU *cpu)
> +{
> + CpuInstanceProperties *props;
> +
> + props = &ms->possible_cpus->cpus[cpu->env.core_id].props;
> +
> + props->socket_id = cpu->env.socket_id;
> + props->book_id = cpu->env.book_id;
> + props->drawer_id = cpu->env.drawer_id;
> +}
> +
> +/**
> + * s390_topology_setup_cpu:
> + * @ms: MachineState used to initialize the topology structure on
> + * first call.
> + * @cpu: the new S390CPU to insert in the topology structure
> + * @errp: the error pointer
> + *
> + * Called from CPU hotplug to check and setup the CPU attributes
> + * before the CPU is inserted in the topology.
> + * There is no need to update the MTCR explicitly here because it
> + * will be updated by KVM on creation of the new CPU.
> + */
> +void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error **errp)
> +{
> + ERRP_GUARD();
> + int entry;
> +
> + /*
> + * We do not want to initialize the topology if the cpu model
s/cpu/CPU/
> + * does not support topology, consequently, we have to wait for
> + * the first CPU to be realized, which realizes the CPU model
> + * to initialize the topology structures.
> + *
> + * s390_topology_setup_cpu() is called from the cpu hotplug.
> + */
> + if (!s390_topology.cores_per_socket) {
> + s390_topology_init(ms);
> + }
> +
> + if (!s390_topology_cpu_default(cpu, errp)) {
> + return;
> + }
> +
> + if (!s390_topology_check(cpu->env.socket_id, cpu->env.book_id,
> + cpu->env.drawer_id, cpu->env.entitlement,
> + cpu->env.dedicated, errp)) {
> + return;
> + }
> +
> + /* Do we still have space in the socket */
> + entry = s390_socket_nb(cpu);
> + if (s390_topology.cores_per_socket[entry] >= current_machine->smp.cores) {
> + error_setg(errp, "No more space on this socket");
> + return;
> + }
> +
> + /* Update the count of cores in sockets */
> + s390_topology.cores_per_socket[entry] += 1;
> +
> + /* topology tree is reflected in props */
> + s390_update_cpu_props(ms, cpu);
> +}
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB
2023-06-30 9:17 ` [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB Pierre Morel
@ 2023-07-04 11:40 ` Thomas Huth
2023-07-04 12:27 ` Thomas Huth
2023-07-12 14:24 ` Pierre Morel
2023-07-25 15:41 ` Nina Schoetterl-Glausch
2023-07-27 17:31 ` Nina Schoetterl-Glausch
2 siblings, 2 replies; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 11:40 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x, frankja, Claudio Imbrenda
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> On interception of STSI(15.1.x) the System Information Block
> (SYSIB) is built from the list of pre-ordered topology entries.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
...
> diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
> index 7ebd5e05b6..6e7d041b01 100644
> --- a/target/s390x/cpu.h
> +++ b/target/s390x/cpu.h
> @@ -569,6 +569,29 @@ typedef struct SysIB_322 {
> } SysIB_322;
> QEMU_BUILD_BUG_ON(sizeof(SysIB_322) != 4096);
>
> +/*
> + * Topology Magnitude fields (MAG) indicates the maximum number of
> + * topology list entries (TLE) at the corresponding nesting level.
> + */
> +#define S390_TOPOLOGY_MAG 6
> +#define S390_TOPOLOGY_MAG6 0
> +#define S390_TOPOLOGY_MAG5 1
> +#define S390_TOPOLOGY_MAG4 2
> +#define S390_TOPOLOGY_MAG3 3
> +#define S390_TOPOLOGY_MAG2 4
> +#define S390_TOPOLOGY_MAG1 5
> +/* Configuration topology */
> +typedef struct SysIB_151x {
> + uint8_t reserved0[2];
> + uint16_t length;
> + uint8_t mag[S390_TOPOLOGY_MAG];
> + uint8_t reserved1;
> + uint8_t mnest;
> + uint32_t reserved2;
> + char tle[];
> +} SysIB_151x;
> +QEMU_BUILD_BUG_ON(sizeof(SysIB_151x) != 16);
> +
> typedef union SysIB {
> SysIB_111 sysib_111;
> SysIB_121 sysib_121;
> @@ -576,9 +599,62 @@ typedef union SysIB {
> SysIB_221 sysib_221;
> SysIB_222 sysib_222;
> SysIB_322 sysib_322;
> + SysIB_151x sysib_151x;
> } SysIB;
> QEMU_BUILD_BUG_ON(sizeof(SysIB) != 4096);
>
> +/*
> + * CPU Topology List provided by STSI with fc=15 provides a list
> + * of two different Topology List Entries (TLE) types to specify
> + * the topology hierarchy.
> + *
> + * - Container Topology List Entry
> + * Defines a container to contain other Topology List Entries
> + * of any type, nested containers or CPU.
> + * - CPU Topology List Entry
> + * Specifies the CPUs position, type, entitlement and polarization
> + * of the CPUs contained in the last Container TLE.
> + *
> + * There can be theoretically up to five levels of containers, QEMU
> + * uses only three levels, the drawer's, book's and socket's level.
> + *
> + * A container with a nesting level (NL) greater than 1 can only
> + * contain another container of nesting level NL-1.
> + *
> + * A container of nesting level 1 (socket), contains as many CPU TLE
> + * as needed to describe the position and qualities of all CPUs inside
> + * the container.
> + * The qualities of a CPU are polarization, entitlement and type.
> + *
> + * The CPU TLE defines the position of the CPUs of identical qualities
> + * using a 64bits mask which first bit has its offset defined by
> + * the CPU address orgin field of the CPU TLE like in:
> + * CPU address = origin * 64 + bit position within the mask
> + *
> + */
> +/* Container type Topology List Entry */
> +typedef struct SysIBTl_container {
> + uint8_t nl;
> + uint8_t reserved[6];
> + uint8_t id;
> +} SysIBTl_container;
Why mixing CamelCase with underscore-style here? SysIBTlContainer would look
more natural, I think?
> +QEMU_BUILD_BUG_ON(sizeof(SysIBTl_container) != 8);
> +
> +/* CPU type Topology List Entry */
> +typedef struct SysIBTl_cpu {
> + uint8_t nl;
> + uint8_t reserved0[3];
> +#define SYSIB_TLE_POLARITY_MASK 0x03
> +#define SYSIB_TLE_DEDICATED 0x04
> + uint8_t flags;
> + uint8_t type;
> + uint16_t origin;
> + uint64_t mask;
> +} SysIBTl_cpu;
dito, maybe better SysIBTlCpu ?
> +QEMU_BUILD_BUG_ON(sizeof(SysIBTl_cpu) != 16);
> +
> +void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr, uint8_t ar);
> +
> /* MMU defines */
> #define ASCE_ORIGIN (~0xfffULL) /* segment table origin */
> #define ASCE_SUBSPACE 0x200 /* subspace group control */
> diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
> index b163c17f8f..ca1634d0ce 100644
> --- a/hw/s390x/cpu-topology.c
> +++ b/hw/s390x/cpu-topology.c
> @@ -29,11 +29,13 @@
> * .cores_per_socket: tracks information on the count of cores
> * per socket.
> * .smp: keeps track of the machine topology.
> - *
> + * .list: queue the topology entries inside which
> + * we keep the information on the CPU topology.
The comment does not match the code below.
> */
> S390Topology s390_topology = {
> /* will be initialized after the cpu model is realized */
> .cores_per_socket = NULL,
> + .polarization = S390_CPU_POLARIZATION_HORIZONTAL,
> };
>
> /**
> diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
> index 3ac7ec9acf..5ea358cbb0 100644
> --- a/target/s390x/kvm/kvm.c
> +++ b/target/s390x/kvm/kvm.c
> @@ -1919,9 +1919,12 @@ static int handle_stsi(S390CPU *cpu)
> if (run->s390_stsi.sel1 != 2 || run->s390_stsi.sel2 != 2) {
> return 0;
> }
> - /* Only sysib 3.2.2 needs post-handling for now. */
> insert_stsi_3_2_2(cpu, run->s390_stsi.addr, run->s390_stsi.ar);
> return 0;
> + case 15:
> + insert_stsi_15_1_x(cpu, run->s390_stsi.sel2, run->s390_stsi.addr,
> + run->s390_stsi.ar);
> + return 0;
> default:
> return 0;
> }
> diff --git a/target/s390x/kvm/stsi-topology.c b/target/s390x/kvm/stsi-topology.c
> new file mode 100644
> index 0000000000..0b789450da
> --- /dev/null
> +++ b/target/s390x/kvm/stsi-topology.c
> @@ -0,0 +1,310 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * QEMU S390x CPU Topology
> + *
> + * Copyright IBM Corp. 2022,2023
> + * Author(s): Pierre Morel <pmorel@linux.ibm.com>
> + *
> + */
> +#include "qemu/osdep.h"
> +#include "cpu.h"
> +#include "hw/s390x/pv.h"
> +#include "hw/sysbus.h"
> +#include "hw/s390x/sclp.h"
> +#include "hw/s390x/cpu-topology.h"
> +
> +/**
> + * fill_container:
> + * @p: The address of the container TLE to fill
> + * @level: The level of nesting for this container
> + * @id: The container receives a unique ID inside its own container
> + *
> + * Returns the next free TLE entry.
> + */
> +static char *fill_container(char *p, int level, int id)
> +{
> + SysIBTl_container *tle = (SysIBTl_container *)p;
> +
> + tle->nl = level;
> + tle->id = id;
> + return p + sizeof(*tle);
> +}
> +
> +/**
> + * fill_tle_cpu:
> + * @p: The address of the CPU TLE to fill
> + * @entry: a pointer to the S390TopologyEntry defining this
> + * CPU container.
> + *
> + * Returns the next free TLE entry.
> + */
> +static char *fill_tle_cpu(char *p, S390TopologyEntry *entry)
> +{
> + SysIBTl_cpu *tle = (SysIBTl_cpu *)p;
> + s390_topology_id topology_id = entry->id;
> +
> + tle->nl = 0;
> + if (topology_id.dedicated) {
> + tle->flags = SYSIB_TLE_DEDICATED;
> + }
> + tle->flags |= topology_id.entitlement;
If it was not dedicated, the "|=" might operate with a random value here.
Better pre-initialize flags with 0, or change the order of the operations here:
tle->flags = topology_id.entitlement;
if (topology_id.dedicated) {
tle->flags |= SYSIB_TLE_DEDICATED;
}
> + tle->type = topology_id.type;
> + tle->origin = cpu_to_be16(topology_id.origin * 64);
> + tle->mask = cpu_to_be64(entry->mask);
> + return p + sizeof(*tle);
> +}
> +
> +/*
> + * Macro to check that the size of data after increment
> + * will not get bigger than the size of the SysIB.
> + */
> +#define SYSIB_GUARD(data, x) do { \
> + data += x; \
> + if (data > sizeof(SysIB)) { \
> + return 0; \
> + } \
> + } while (0)
> +
> +/**
> + * stsi_topology_fill_sysib:
> + * @p: A pointer to the position of the first TLE
> + * @level: The nested level wanted by the guest
> + *
> + * Fill the SYSIB with the topology information as described in
> + * the PoP, nesting containers as appropriate, with the maximum
> + * nesting limited by @level.
> + *
> + * Return value:
> + * On success: the size of the SysIB_15x after being filled with TLE.
> + * On error: 0 in the case we would overrun the end of the SysIB.
> + */
> +static int stsi_topology_fill_sysib(S390TopologyList *topology_list,
> + char *p, int level)
> +{
> + S390TopologyEntry *entry;
> + int last_drawer = -1;
> + int last_book = -1;
> + int last_socket = -1;
> + int drawer_id = 0;
> + int book_id = 0;
> + int socket_id = 0;
> + int n = sizeof(SysIB_151x);
> +
> + QTAILQ_FOREACH(entry, topology_list, next) {
> + bool drawer_change = last_drawer != entry->id.drawer;
> + bool book_change = drawer_change || last_book != entry->id.book;
> + bool socket_change = book_change || last_socket != entry->id.socket;
> +
> + /* If we reach the sentinel get out */
> + if (entry->id.sentinel) {
> + break;
> + }
> +
> + if (level > 3 && drawer_change) {
> + SYSIB_GUARD(n, sizeof(SysIBTl_container));
> + p = fill_container(p, 3, drawer_id++);
> + book_id = 0;
> + }
> + if (level > 2 && book_change) {
> + SYSIB_GUARD(n, sizeof(SysIBTl_container));
> + p = fill_container(p, 2, book_id++);
> + socket_id = 0;
> + }
> + if (socket_change) {
> + SYSIB_GUARD(n, sizeof(SysIBTl_container));
> + p = fill_container(p, 1, socket_id++);
> + }
> +
> + SYSIB_GUARD(n, sizeof(SysIBTl_cpu));
> + p = fill_tle_cpu(p, entry);
> + last_drawer = entry->id.drawer;
> + last_book = entry->id.book;
> + last_socket = entry->id.socket;
> + }
> +
> + return n;
> +}
> +
> +/**
> + * setup_stsi:
> + * sysib: pointer to a SysIB to be filled with SysIB_151x data
> + * level: Nested level specified by the guest
> + *
> + * Setup the SYSIB for STSI 15.1, the header as well as the description
> + * of the topology.
> + */
> +static int setup_stsi(S390TopologyList *topology_list, SysIB_151x *sysib,
> + int level)
> +{
> + sysib->mnest = level;
> + switch (level) {
> + case 4:
> + sysib->mag[S390_TOPOLOGY_MAG4] = current_machine->smp.drawers;
> + sysib->mag[S390_TOPOLOGY_MAG3] = current_machine->smp.books;
> + sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.sockets;
> + sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
> + break;
> + case 3:
> + sysib->mag[S390_TOPOLOGY_MAG3] = current_machine->smp.drawers *
> + current_machine->smp.books;
> + sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.sockets;
> + sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
> + break;
> + case 2:
> + sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.drawers *
> + current_machine->smp.books *
> + current_machine->smp.sockets;
> + sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
> + break;
> + }
> +
> + return stsi_topology_fill_sysib(topology_list, sysib->tle, level);
> +}
> +
> +/**
> + * s390_topology_add_cpu_to_entry:
> + * @entry: Topology entry to setup
> + * @cpu: the S390CPU to add
> + *
> + * Set the core bit inside the topology mask and
> + * increments the number of cores for the socket.
The second part of the sentence does not seem to be done here anymore?
> + */
> +static void s390_topology_add_cpu_to_entry(S390TopologyEntry *entry,
> + S390CPU *cpu)
> +{
> + set_bit(63 - (cpu->env.core_id % 64), &entry->mask);
> +}
> +
> +/**
> + * s390_topology_from_cpu:
> + * @cpu: The S390CPU
> + *
> + * Initialize the topology id from the CPU environment.
> + */
> +static s390_topology_id s390_topology_from_cpu(S390CPU *cpu)
> +{
> + s390_topology_id topology_id = {0};
> +
> + topology_id.drawer = cpu->env.drawer_id;
> + topology_id.book = cpu->env.book_id;
> + topology_id.socket = cpu->env.socket_id;
> + topology_id.origin = cpu->env.core_id / 64;
> + topology_id.type = S390_TOPOLOGY_CPU_IFL;
> + topology_id.dedicated = cpu->env.dedicated;
> +
> + if (s390_topology.polarization == S390_CPU_POLARIZATION_VERTICAL) {
> + topology_id.entitlement = cpu->env.entitlement;
> + }
> +
> + return topology_id;
> +}
> +
> +/**
> + * s390_topology_insert:
> + * @cpu: s390CPU insert.
"s390CPU insert" sounds like a weird description for @cpu
> + *
> + * Parse the topology list to find if the entry already
> + * exist and add the core in it.
> + * If it does not exist, allocate a new entry and insert
> + * it in the queue from lower id to greater id.
> + */
> +static void s390_topology_insert(S390TopologyList *topology_list, S390CPU *cpu)
> +{
> + s390_topology_id id = s390_topology_from_cpu(cpu);
> + S390TopologyEntry *entry = NULL;
> + S390TopologyEntry *tmp = NULL;
> +
> + QTAILQ_FOREACH(tmp, topology_list, next) {
> + if (id.id == tmp->id.id) {
> + s390_topology_add_cpu_to_entry(tmp, cpu);
> + return;
> + } else if (id.id < tmp->id.id) {
> + entry = g_malloc0(sizeof(S390TopologyEntry));
> + entry->id.id = id.id;
> + s390_topology_add_cpu_to_entry(entry, cpu);
> + QTAILQ_INSERT_BEFORE(tmp, entry, next);
> + return;
> + }
> + }
> +}
> +
> +/**
> + * s390_topology_fill_list_sorted:
> + *
> + * Loop over all CPU and insert it at the right place
> + * inside the TLE entry list.
> + * Fill the S390Topology list with entries according to the order
> + * specified by the PoP.
> + */
> +static void s390_topology_fill_list_sorted(S390TopologyList *topology_list)
> +{
> + CPUState *cs;
> +
> + CPU_FOREACH(cs) {
> + s390_topology_insert(topology_list, S390_CPU(cs));
> + }
> +}
> +
> +/**
> + * s390_topology_empty_list:
> + *
> + * Clear all entries in the S390Topology list except the sentinel.
> + */
> +static void s390_topology_empty_list(S390TopologyList *topology_list)
> +{
> + S390TopologyEntry *entry = NULL;
> + S390TopologyEntry *tmp = NULL;
> +
> + QTAILQ_FOREACH_SAFE(entry, topology_list, next, tmp) {
> + QTAILQ_REMOVE(topology_list, entry, next);
> + g_free(entry);
> + }
> +}
> +
> +/**
> + * insert_stsi_15_1_x:
> + * cpu: the CPU doing the call for which we set CC
> + * sel2: the selector 2, containing the nested level
> + * addr: Guest logical address of the guest SysIB
> + * ar: the access register number
> + *
> + * Create a list head for the Topology entries and initialize it.
s/Topology/topology/
> + * Insert the first entry as a sentinelle.
s/sentinelle/sentinel/
> + * Emulate STSI 15.1.x, that is, perform all necessary checks and
> + * fill the SYSIB.
> + * In case the topology description is too long to fit into the SYSIB,
> + * set CC=3 and abort without writing the SYSIB.
> + */
> +void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr, uint8_t ar)
> +{
> + S390TopologyList topology_list;
> + S390TopologyEntry *entry;
> + SysIB sysib = {0};
> + int length;
> +
> + if (!s390_has_topology() || sel2 < 2 || sel2 > SCLP_READ_SCP_INFO_MNEST) {
> + setcc(cpu, 3);
> + return;
> + }
> +
> + QTAILQ_INIT(&topology_list);
> + entry = g_malloc0(sizeof(S390TopologyEntry));
> + entry->id.sentinel = 0xff;
> + QTAILQ_INSERT_HEAD(&topology_list, entry, next);
> +
> + s390_topology_fill_list_sorted(&topology_list);
> +
> + length = setup_stsi(&topology_list, &sysib.sysib_151x, sel2);
> +
> + if (!length) {
> + setcc(cpu, 3);
> + return;
> + }
> +
> + sysib.sysib_151x.length = cpu_to_be16(length);
> + s390_cpu_virt_mem_write(cpu, addr, ar, &sysib, length);
> + setcc(cpu, 0);
s390_cpu_virt_mem_write() could fail, I think in that case you should not
change the CC value here?
Also, what about protected virtualization? Do you have to use
s390_cpu_pv_mem_write() in case PV is enabled?
> +
> + s390_topology_empty_list(&topology_list);
> +}
> diff --git a/target/s390x/kvm/meson.build b/target/s390x/kvm/meson.build
> index 37253f75bf..bcf014ba87 100644
> --- a/target/s390x/kvm/meson.build
> +++ b/target/s390x/kvm/meson.build
> @@ -1,6 +1,7 @@
>
> s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
> - 'kvm.c'
> + 'kvm.c',
> + 'stsi-topology.c'
> ), if_false: files(
> 'stubs.c'
> ))
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 06/20] s390x/cpu topology: interception of PTF instruction
2023-06-30 9:17 ` [PATCH v21 06/20] s390x/cpu topology: interception of PTF instruction Pierre Morel
@ 2023-07-04 12:16 ` Thomas Huth
2023-07-12 14:40 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 12:16 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> When the host supports the CPU topology facility, the PTF
> instruction with function code 2 is interpreted by the SIE,
> provided that the userland hypervisor activates the interpretation
> by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension.
>
> The PTF instructions with function code 0 and 1 are intercepted
> and must be emulated by the userland hypervisor.
>
> During RESET all CPU of the configuration are placed in
> horizontal polarity.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
> ---
> include/hw/s390x/s390-virtio-ccw.h | 6 ++++
> hw/s390x/cpu-topology.c | 54 ++++++++++++++++++++++++++++++
> target/s390x/kvm/kvm.c | 11 ++++++
> 3 files changed, 71 insertions(+)
Reviewed-by: Thomas Huth <thuth@redhat.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB
2023-07-04 11:40 ` Thomas Huth
@ 2023-07-04 12:27 ` Thomas Huth
2023-07-12 14:24 ` Pierre Morel
1 sibling, 0 replies; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 12:27 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x, frankja, Claudio Imbrenda
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, berrange, clg
On 04/07/2023 13.40, Thomas Huth wrote:
...
> Also, what about protected virtualization? Do you have to use
> s390_cpu_pv_mem_write() in case PV is enabled?
Never mind, I keep forgetting that CPU topology can't be used together with
PV (I just noticed after reading patch 07/20).
Not sure ... but maybe a comment here in the code would help?
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command
2023-06-30 9:17 ` [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command Pierre Morel
@ 2023-07-04 12:53 ` Thomas Huth
2023-07-12 14:45 ` Pierre Morel
2023-07-18 7:54 ` Nina Schoetterl-Glausch
1 sibling, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 12:53 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> The modification of the CPU attributes are done through a monitor
> command.
>
> It allows to move the core inside the topology tree to optimize
> the cache usage in the case the host's hypervisor previously
> moved the CPU.
>
> The same command allows to modify the CPU attributes modifiers
> like polarization entitlement and the dedicated attribute to notify
> the guest if the host admin modified scheduling or dedication of a vCPU.
>
> With this knowledge the guest has the possibility to optimize the
> usage of the vCPUs.
>
> The command has a feature unstable for the moment.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
...
> diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
> index 1af70a5049..dfc4cb42a4 100644
> --- a/hw/s390x/cpu-topology.c
> +++ b/hw/s390x/cpu-topology.c
> @@ -23,6 +23,7 @@
> #include "target/s390x/cpu.h"
> #include "hw/s390x/s390-virtio-ccw.h"
> #include "hw/s390x/cpu-topology.h"
> +#include "qapi/qapi-commands-machine-target.h"
>
> /*
> * s390_topology is used to keep the topology information.
> @@ -260,6 +261,29 @@ static bool s390_topology_check(uint16_t socket_id, uint16_t book_id,
> return true;
> }
>
> +/**
> + * s390_topology_need_report
> + * @cpu: Current cpu
> + * @drawer_id: future drawer ID
> + * @book_id: future book ID
> + * @socket_id: future socket ID
> + * @entitlement: future entitlement
> + * @dedicated: future dedicated
> + *
> + * A modified topology change report is needed if the topology
> + * tree or the topology attributes change.
> + */
> +static bool s390_topology_need_report(S390CPU *cpu, int drawer_id,
> + int book_id, int socket_id,
> + uint16_t entitlement, bool dedicated)
> +{
> + return cpu->env.drawer_id != drawer_id ||
> + cpu->env.book_id != book_id ||
> + cpu->env.socket_id != socket_id ||
> + cpu->env.entitlement != entitlement ||
> + cpu->env.dedicated != dedicated;
> +}
> +
> /**
> * s390_update_cpu_props:
> * @ms: the machine state
> @@ -329,3 +353,113 @@ void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error **errp)
> /* topology tree is reflected in props */
> s390_update_cpu_props(ms, cpu);
> }
> +
> +static void s390_change_topology(uint16_t core_id,
> + bool has_socket_id, uint16_t socket_id,
> + bool has_book_id, uint16_t book_id,
> + bool has_drawer_id, uint16_t drawer_id,
> + bool has_entitlement,
> + CpuS390Entitlement entitlement,
> + bool has_dedicated, bool dedicated,
> + Error **errp)
> +{
> + MachineState *ms = current_machine;
> + int old_socket_entry;
> + int new_socket_entry;
> + bool report_needed;
> + S390CPU *cpu;
> + ERRP_GUARD();
> +
> + cpu = s390_cpu_addr2state(core_id);
> + if (!cpu) {
> + error_setg(errp, "Core-id %d does not exist!", core_id);
> + return;
> + }
> +
> + /* Get attributes not provided from cpu and verify the new topology */
> + if (!has_socket_id) {
> + socket_id = cpu->env.socket_id;
> + }
> + if (!has_book_id) {
> + book_id = cpu->env.book_id;
> + }
> + if (!has_drawer_id) {
> + drawer_id = cpu->env.drawer_id;
> + }
> + if (!has_dedicated) {
> + dedicated = cpu->env.dedicated;
> + }
> +
> + /*
> + * When the user specifies the entitlement as 'auto' on the command line,
> + * qemu will set the entitlement as:
> + * Medium when the CPU is not dedicated.
> + * High when dedicated is true.
> + */
> + if (!has_entitlement || (entitlement == S390_CPU_ENTITLEMENT_AUTO)) {
> + if (dedicated) {
> + entitlement = S390_CPU_ENTITLEMENT_HIGH;
> + } else {
> + entitlement = S390_CPU_ENTITLEMENT_MEDIUM;
> + }
> + }
> +
> + if (!s390_topology_check(socket_id, book_id, drawer_id,
> + entitlement, dedicated, errp))
> + return;
Missing curly braces here.
Not sure why this isn't caught by checkpatch.pl properly :-(
Thomas
> + /* Check for space on new socket */
> + old_socket_entry = s390_socket_nb(cpu);
> + new_socket_entry = __s390_socket_nb(drawer_id, book_id, socket_id);
> +
> + if (new_socket_entry != old_socket_entry) {
> + if (s390_topology.cores_per_socket[new_socket_entry] >=
> + ms->smp.cores) {
> + error_setg(errp, "No more space on this socket");
> + return;
> + }
> + /* Update the count of cores in sockets */
> + s390_topology.cores_per_socket[new_socket_entry] += 1;
> + s390_topology.cores_per_socket[old_socket_entry] -= 1;
> + }
> +
> + /* Check if we will need to report the modified topology */
> + report_needed = s390_topology_need_report(cpu, drawer_id, book_id,
> + socket_id, entitlement,
> + dedicated);
> +
> + /* All checks done, report new topology into the vCPU */
> + cpu->env.drawer_id = drawer_id;
> + cpu->env.book_id = book_id;
> + cpu->env.socket_id = socket_id;
> + cpu->env.dedicated = dedicated;
> + cpu->env.entitlement = entitlement;
> +
> + /* topology tree is reflected in props */
> + s390_update_cpu_props(ms, cpu);
> +
> + /* Advertise the topology change */
> + if (report_needed) {
> + s390_cpu_topology_set_changed(true);
> + }
> +}
> +
> +void qmp_set_cpu_topology(uint16_t core,
> + bool has_socket, uint16_t socket,
> + bool has_book, uint16_t book,
> + bool has_drawer, uint16_t drawer,
> + bool has_entitlement, CpuS390Entitlement entitlement,
> + bool has_dedicated, bool dedicated,
> + Error **errp)
> +{
> + ERRP_GUARD();
> +
> + if (!s390_has_topology()) {
> + error_setg(errp, "This machine doesn't support topology");
> + return;
> + }
> +
> + s390_change_topology(core, has_socket, socket, has_book, book,
> + has_drawer, drawer, has_entitlement, entitlement,
> + has_dedicated, dedicated, errp);
> +}
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 09/20] machine: adding s390 topology to query-cpu-fast
2023-06-30 9:17 ` [PATCH v21 09/20] machine: adding s390 topology to query-cpu-fast Pierre Morel
@ 2023-07-04 12:55 ` Thomas Huth
2023-07-12 15:44 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 12:55 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> S390x provides two more topology attributes, entitlement and dedication.
>
> Let's add these CPU attributes to the QAPI command query-cpu-fast.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> qapi/machine.json | 9 ++++++++-
> target/s390x/cpu.c | 4 ++++
> 2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/qapi/machine.json b/qapi/machine.json
> index 08245beea1..a1920cb78d 100644
> --- a/qapi/machine.json
> +++ b/qapi/machine.json
> @@ -56,10 +56,17 @@
> # Additional information about a virtual S390 CPU
> #
> # @cpu-state: the virtual CPU's state
> +# @dedicated: the virtual CPU's dedication (since 8.1)
> +# @entitlement: the virtual CPU's entitlement (since 8.1)
> #
> # Since: 2.12
> ##
> -{ 'struct': 'CpuInfoS390', 'data': { 'cpu-state': 'CpuS390State' } }
> +{ 'struct': 'CpuInfoS390',
> + 'data': { 'cpu-state': 'CpuS390State',
> + 'dedicated': 'bool',
> + 'entitlement': 'CpuS390Entitlement'
Would it make sense to make them optional and only report those if the
topology feature is enabled?
Thomas
> + }
> +}
>
> ##
> # @CpuInfoFast:
> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
> index 74405beb51..01938635eb 100644
> --- a/target/s390x/cpu.c
> +++ b/target/s390x/cpu.c
> @@ -146,6 +146,10 @@ static void s390_query_cpu_fast(CPUState *cpu, CpuInfoFast *value)
> S390CPU *s390_cpu = S390_CPU(cpu);
>
> value->u.s390x.cpu_state = s390_cpu->env.cpu_state;
> +#if !defined(CONFIG_USER_ONLY)
> + value->u.s390x.dedicated = s390_cpu->env.dedicated;
> + value->u.s390x.entitlement = s390_cpu->env.entitlement;
> +#endif
> }
>
> /* S390CPUClass::reset() */
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 10/20] machine: adding s390 topology to info hotpluggable-cpus
2023-06-30 9:17 ` [PATCH v21 10/20] machine: adding s390 topology to info hotpluggable-cpus Pierre Morel
@ 2023-07-04 12:59 ` Thomas Huth
2023-07-12 16:02 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 12:59 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> S390 topology adds books and drawers topology containers.
> Let's add these to the HMP information for hotpluggable cpus.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
> ---
> hw/core/machine-hmp-cmds.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/hw/core/machine-hmp-cmds.c b/hw/core/machine-hmp-cmds.c
> index c3e55ef9e9..f247ba3206 100644
> --- a/hw/core/machine-hmp-cmds.c
> +++ b/hw/core/machine-hmp-cmds.c
> @@ -71,6 +71,12 @@ void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict)
> if (c->has_node_id) {
> monitor_printf(mon, " node-id: \"%" PRIu64 "\"\n", c->node_id);
> }
> + if (c->has_drawer_id) {
> + monitor_printf(mon, " drawer-id: \"%" PRIu64 "\"\n", c->drawer_id);
> + }
> + if (c->has_book_id) {
> + monitor_printf(mon, " book-id: \"%" PRIu64 "\"\n", c->book_id);
I think the output should be left-aligned (with four spaces at the
beginning), not right aligned to the colons?
Thomas
> + }
> if (c->has_socket_id) {
> monitor_printf(mon, " socket-id: \"%" PRIu64 "\"\n", c->socket_id);
> }
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event
2023-06-30 9:17 ` [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event Pierre Morel
@ 2023-07-04 13:04 ` Thomas Huth
2023-07-12 16:05 ` Pierre Morel
2023-07-18 7:59 ` Nina Schoetterl-Glausch
1 sibling, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 13:04 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> When the guest asks to change the polarization this change
> is forwarded to the upper layer using QAPI.
> The upper layer is supposed to take according decisions concerning
> CPU provisioning.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> qapi/machine-target.json | 33 +++++++++++++++++++++++++++++++++
> hw/s390x/cpu-topology.c | 2 ++
> 2 files changed, 35 insertions(+)
Reviewed-by: Thomas Huth <thuth@redhat.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 14/20] tests/avocado: s390x cpu topology core
2023-06-30 9:17 ` [PATCH v21 14/20] tests/avocado: s390x cpu topology core Pierre Morel
@ 2023-07-04 13:14 ` Thomas Huth
2023-07-19 9:24 ` Pierre Morel
2023-07-12 20:00 ` Nina Schoetterl-Glausch
1 sibling, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-04 13:14 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> Introduction of the s390x cpu topology core functions and
> basic tests.
>
> We test the corelation between the command line and
> the QMP results in query-cpus-fast for various CPU topology.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> MAINTAINERS | 1 +
> tests/avocado/s390_topology.py | 196 +++++++++++++++++++++++++++++++++
> 2 files changed, 197 insertions(+)
> create mode 100644 tests/avocado/s390_topology.py
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 76f236564c..12d0d7bd91 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1705,6 +1705,7 @@ F: hw/s390x/cpu-topology.c
> F: target/s390x/kvm/stsi-topology.c
> F: docs/devel/s390-cpu-topology.rst
> F: docs/system/s390x/cpu-topology.rst
> +F: tests/avocado/s390_topology.py
>
> X86 Machines
> ------------
> diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
> new file mode 100644
> index 0000000000..1758ec1f13
> --- /dev/null
> +++ b/tests/avocado/s390_topology.py
> @@ -0,0 +1,196 @@
> +# Functional test that boots a Linux kernel and checks the console
> +#
> +# Copyright IBM Corp. 2023
> +#
> +# Author:
> +# Pierre Morel <pmorel@linux.ibm.com>
> +#
> +# This work is licensed under the terms of the GNU GPL, version 2 or
> +# later. See the COPYING file in the top-level directory.
> +
> +import os
> +import shutil
> +import time
> +
> +from avocado_qemu import QemuSystemTest
> +from avocado_qemu import exec_command
> +from avocado_qemu import exec_command_and_wait_for_pattern
> +from avocado_qemu import interrupt_interactive_console_until_pattern
> +from avocado_qemu import wait_for_console_pattern
> +from avocado.utils import process
> +from avocado.utils import archive
> +
> +
> +class S390CPUTopology(QemuSystemTest):
> + """
> + S390x CPU topology consist of 4 topology layers, from bottom to top,
> + the cores, sockets, books and drawers and 2 modifiers attributes,
> + the entitlement and the dedication.
> + See: docs/system/s390x/cpu-topology.rst.
> +
> + S390x CPU topology is setup in different ways:
> + - implicitely from the '-smp' argument by completing each topology
implicitly
> + level one after the other begining with drawer 0, book 0 and socket 0.
beginning
> + - explicitely from the '-device' argument on the QEMU command line
explicitly
> + - explicitely by hotplug of a new CPU using QMP or HMP
explicitly
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command
2023-06-30 9:17 ` [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command Pierre Morel
@ 2023-07-05 7:58 ` Thomas Huth
2023-07-12 16:12 ` Pierre Morel
2023-07-26 11:54 ` Nina Schoetterl-Glausch
1 sibling, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-05 7:58 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> The query-cpu-polarization qmp command returns the current
> CPU polarization of the machine.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> qapi/machine-target.json | 29 +++++++++++++++++++++++++++++
> hw/s390x/cpu-topology.c | 8 ++++++++
> 2 files changed, 37 insertions(+)
>
> diff --git a/qapi/machine-target.json b/qapi/machine-target.json
> index 1362e43983..1e4b8976aa 100644
> --- a/qapi/machine-target.json
> +++ b/qapi/machine-target.json
> @@ -445,3 +445,32 @@
> 'features': [ 'unstable' ],
> 'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
> }
> +
> +##
> +# @CpuPolarizationInfo:
> +#
> +# The result of a cpu polarization
> +#
> +# @polarization: the CPU polarization
> +#
> +# Since: 8.1
> +##
> +{ 'struct': 'CpuPolarizationInfo',
> + 'data': { 'polarization': 'CpuS390Polarization' },
> + 'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
> +}
> +
> +##
> +# @query-cpu-polarization:
> +#
> +# Features:
> +# @unstable: This command may still be modified.
> +#
> +# Returns: the machine polarization
> +#
> +# Since: 8.1
> +##
> +{ 'command': 'query-cpu-polarization', 'returns': 'CpuPolarizationInfo',
Since this is very specific to s390x, I wonder whether we want to have a
"s390x" in the command name? 'query-s390x-cpu-polarization'? ... or is this
getting too long already?
Anyway,
Reviewed-by: Thomas Huth <thuth@redhat.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 13/20] docs/s390x/cpu topology: document s390x cpu topology
2023-06-30 9:17 ` [PATCH v21 13/20] docs/s390x/cpu topology: document s390x cpu topology Pierre Morel
@ 2023-07-05 8:41 ` Thomas Huth
2023-07-12 16:27 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-05 8:41 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> Add some basic examples for the definition of cpu topology
> in s390x.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> MAINTAINERS | 2 +
> docs/devel/index-internals.rst | 1 +
> docs/devel/s390-cpu-topology.rst | 170 ++++++++++++++++++++
> docs/system/s390x/cpu-topology.rst | 240 +++++++++++++++++++++++++++++
> docs/system/target-s390x.rst | 1 +
> 5 files changed, 414 insertions(+)
> create mode 100644 docs/devel/s390-cpu-topology.rst
> create mode 100644 docs/system/s390x/cpu-topology.rst
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b8d3e8815c..76f236564c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1703,6 +1703,8 @@ S: Supported
> F: include/hw/s390x/cpu-topology.h
> F: hw/s390x/cpu-topology.c
> F: target/s390x/kvm/stsi-topology.c
> +F: docs/devel/s390-cpu-topology.rst
> +F: docs/system/s390x/cpu-topology.rst
>
> X86 Machines
> ------------
> diff --git a/docs/devel/index-internals.rst b/docs/devel/index-internals.rst
> index e1a93df263..6f81df92bc 100644
> --- a/docs/devel/index-internals.rst
> +++ b/docs/devel/index-internals.rst
> @@ -14,6 +14,7 @@ Details about QEMU's various subsystems including how to add features to them.
> migration
> multi-process
> reset
> + s390-cpu-topology
> s390-dasd-ipl
> tracing
> vfio-migration
> diff --git a/docs/devel/s390-cpu-topology.rst b/docs/devel/s390-cpu-topology.rst
> new file mode 100644
> index 0000000000..cd36476011
> --- /dev/null
> +++ b/docs/devel/s390-cpu-topology.rst
> @@ -0,0 +1,170 @@
> +QAPI interface for S390 CPU topology
> +====================================
> +
> +Let's start QEMU with the following command defining 4 CPUs,
Maybe better something like this:
The following sections will explain the S390 CPU topology with the help of
exemplary output. For this, let's assume that QEMU has been started with the
following command, defining 4 CPUs.
?
> +CPU[0] defined by the -smp argument will have default values:
> +
> +.. code-block:: bash
> +
> + qemu-system-s390x \
> + -enable-kvm \
> + -cpu z14,ctop=on \
> + -smp 1,drawers=3,books=3,sockets=2,cores=2,maxcpus=36 \
> + \
> + -device z14-s390x-cpu,core-id=19,entitlement=high \
> + -device z14-s390x-cpu,core-id=11,entitlement=low \
> + -device z14-s390x-cpu,core-id=112,entitlement=high \
> + ...
> +
> +and see the result when using the QAPI interface.
...
> +QAPI command: set-cpu-topology
> +------------------------------
> +
> +The command set-cpu-topology allows to modify the topology tree
> +or the topology modifiers of a vCPU in the configuration.
> +
> +.. code-block:: QMP
> +
> + { "execute": "set-cpu-topology",
> + "arguments": {
> + "core-id": 11,
> + "socket-id": 0,
> + "book-id": 0,
> + "drawer-id": 0,
> + "entitlement": "low",
> + "dedicated": false
> + }
> + }
> + {"return": {}}
> +
> +The core-id parameter is the only non optional parameter and every
> +unspecified parameter keeps its previous value.
> +
> +QAPI event CPU_POLARIZATION_CHANGE
> +----------------------------------
> +
> +When a guest is requests a modification of the polarization,
Scratch the word "is".
> +QEMU sends a CPU_POLARIZATION_CHANGE event.
...
> diff --git a/docs/system/s390x/cpu-topology.rst b/docs/system/s390x/cpu-topology.rst
> new file mode 100644
> index 0000000000..0535a5d883
> --- /dev/null
> +++ b/docs/system/s390x/cpu-topology.rst
> @@ -0,0 +1,240 @@
> +CPU topology on s390x
> +=====================
> +
> +Since QEMU 8.1, CPU topology on s390x provides up to 3 levels of
> +topology containers: drawers, books, sockets, defining a tree shaped
> +hierarchy.
"drawers, books and sockets. They define a tree-shaped hierarchy."
?
> +The socket container contains one or more CPU entries.
"The socket container has one or more CPU entries." ?
> +Each of these CPU entries consists of a bitmap and three CPU attributes:
> +
> +- CPU type
> +- entitlement
> +- dedication
> +
> +Each bit set in the bitmap correspond to the core-id of a vCPU with
> +matching the three attribute.
> +
> +This documentation provide general information on S390 CPU topology,
> +how to enable it and on the new CPU attributes.
> +For information on how to modify the S390 CPU topology and on how to
> +monitor the polarization change see ``Developer Information``.
It would be nicer to have a proper link here instead. See commit
d6359e150dbdf84f67add786473fd277a9a442bb for example how to do this in our
.rst files.
> +Prerequisites
> +-------------
> +
> +To use the CPU topology, you need to run with KVM on a s390x host that
> +uses the Linux kernel v6.0 or newer (which provide the so-called
> +``KVM_CAP_S390_CPU_TOPOLOGY`` capability that allows QEMU to signal the
> +CPU topology facility via the so-called STFLE bit 11 to the VM).
> +
> +Enabling CPU topology
> +---------------------
> +
> +Currently, CPU topology is only enabled in the host model by default.
> +
> +Enabling CPU topology in a CPU model is done by setting the CPU flag
> +``ctop`` to ``on`` like in:
> +
> +.. code-block:: bash
> +
> + -cpu gen16b,ctop=on
> +
> +Having the topology disabled by default allows migration between
> +old and new QEMU without adding new flags.
> +
> +Default topology usage
> +----------------------
> +
> +The CPU topology can be specified on the QEMU command line
> +with the ``-smp`` or the ``-device`` QEMU command arguments.
> +
> +Note also that since 7.2 threads are no longer supported in the topology
> +and the ``-smp`` command line argument accepts only ``threads=1``.
> +
> +If none of the containers attributes (drawers, books, sockets) are
> +specified for the ``-smp`` flag, the number of these containers
> +is ``1`` .
"Thus the following two options will result in the same topology, for
example:" ?
> +.. code-block:: bash
> +
> + -smp cpus=5,drawer=1,books=1,sockets=8,cores=4,maxcpus=32
> +
> +or
> +
> +.. code-block:: bash
> +
> + -smp cpus=5,sockets=8,cores=4,maxcpus=32
> +
> +When a CPU is defined by the ``-smp`` command argument, its position
> +inside the topology is calculated by adding the CPUs to the topology
> +based on the core-id starting with core-0 at position 0 of socket-0,
> +book-0, drawer-0 and filling all CPUs of socket-0 before to fill socket-1
> +of book-0 and so on up to the last socket of the last book of the last
> +drawer.
> +
> +When a CPU is defined by the ``-device`` command argument, the
> +tree topology attributes must be all defined or all not defined.
> +
> +.. code-block:: bash
> +
> + -device gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=1
> +
> +or
> +
> +.. code-block:: bash
> +
> + -device gen16b-s390x-cpu,core-id=1,dedicated=true
> +
> +If none of the tree attributes (drawer, book, sockets), are specified
> +for the ``-device`` argument, as for all CPUs defined with the ``-smp``
> +command argument the topology tree attributes will be set by simply
> +adding the CPUs to the topology based on the core-id starting with
> +core-0 at position 0 of socket-0, book-0, drawer-0.
> +
> +QEMU will not try to solve collisions and will report an error if the
> +CPU topology, explicitly or implicitly defined on a ``-device``
> +argument collides with the definition of a CPU implicitely defined
s/implicitely/implicitly/
> +on the ``-smp`` argument.
> +
> +When the topology modifier attributes are not defined for the
> +``-device`` command argument they takes following default values:
> +
> +- dedicated: ``false``
> +- entitlement: ``medium``
> +
> +
> +Hot plug
> +++++++++
> +
> +New CPUs can be plugged using the device_add hmp command as in:
> +
> +.. code-block:: bash
> +
> + (qemu) device_add gen16b-s390x-cpu,core-id=9
> +
> +The same placement of the CPU is derived from the core-id as described above.
> +
> +The topology can of course be fully defined:
> +
> +.. code-block:: bash
> +
> + (qemu) device_add gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=1
> +
> +
> +Examples
> +++++++++
> +
> +In the following machine we define 8 sockets with 4 cores each.
> +
> +.. code-block:: bash
> +
> + $ qemu-system-s390x -m 2G \
> + -cpu gen16b,ctop=on \
> + -smp cpus=5,sockets=8,cores=4,maxcpus=32 \
> + -device host-s390x-cpu,core-id=14 \
> +
> +A new CPUs can be plugged using the device_add hmp command as before:
> +
> +.. code-block:: bash
> +
> + (qemu) device_add gen16b-s390x-cpu,core-id=9
> +
> +The core-id defines the placement of the core in the topology by
> +starting with core 0 in socket 0 up to maxcpus.
> +
> +In the example above:
> +
> +* There are 5 CPUs provided to the guest with the ``-smp`` command line
> + They will take the core-ids 0,1,2,3,4
> + As we have 4 cores in a socket, we have 4 CPUs provided
> + to the guest in socket 0, with core-ids 0,1,2,3.
> + The last cpu, with core-id 4, will be on socket 1.
> +
> +* the core with ID 14 provided by the ``-device`` command line will
> + be placed in socket 3, with core-id 14
> +
> +* the core with ID 9 provided by the ``device_add`` qmp command will
> + be placed in socket 2, with core-id 9
> +
> +
> +Polarization, entitlement and dedication
> +----------------------------------------
> +
> +Polarization
> +++++++++++++
> +
> +The polarization is an indication given by the ``guest`` to the host
Why quoting guest, but not host? I'd remove the quotes from guest here.
> +that it is able to make use of CPU provisioning information.
> +The guest indicates the polarization by using the PTF instruction.
> +
> +Polarization is define two models of CPU provisioning: horizontal
"Polarization defines ..." ? ... or "Polarization is defined by ..." ?
> +and vertical.
> +
> +The horizontal polarization is the default model on boot and after
> +subsystem reset in which the guest considers all vCPUs being having
scratch "being" ?
> +an equal provisioning of CPUs by the host.
> +
> +In the vertical polarization model the guest can make use of the
> +vCPU entitlement information provided by the host to optimize
> +kernel thread scheduling.
> +
> +A subsystem reset puts all vCPU of the configuration into the
> +horizontal polarization.
> +
> +Entitlement
> ++++++++++++
> +
> +The vertical polarization specifies that the guest's vCPU can get
> +different real CPU provisions:
> +
> +- a vCPU with vertical high entitlement specifies that this
> + vCPU gets 100% of the real CPU provisioning.
> +
> +- a vCPU with vertical medium entitlement specifies that this
> + vCPU shares the real CPU with other vCPUs.
> +
> +- a vCPU with vertical low entitlement specifies that this
> + vCPU only gets real CPU provisioning when no other vCPUs needs it.
> +
> +In the case a vCPU with vertical high entitlement does not use
> +the real CPU, the unused "slack" can be dispatched to other vCPU
> +with medium or low entitlement.
> +
> +The upper level specifies a vCPU as ``dedicated`` when the vCPU is
Using `` quotes will print "dedicated" in monotyped font ... is that what
you wanted here? AFAIK we're mainly doing that for things that can be typed
in the terminal, e.g. command line options. So should this use normal quotes
instead?
> +fully dedicated to a single real CPU.
> +
> +The dedicated bit is an indication of affinity of a vCPU for a real CPU
> +while the entitlement indicates the sharing or exclusivity of use.
> +
> +Defining the topology on command line
> +-------------------------------------
> +
> +The topology can entirely be defined using -device cpu statements,
> +with the exception of CPU 0 which must be defined with the -smp
> +argument.
> +
> +For example, here we set the position of the cores 1,2,3 to
> +drawer 1, book 1, socket 2 and cores 0,9 and 14 to drawer 0,
> +book 0, socket 0 without defining entitlement or dedication.
> +The core 4, will be set on its default position on socket 1
> +(since we have 4 core per socket) and we define it as dedicated and
> +with vertical high entitlement.
> +
> +.. code-block:: bash
> +
> + $ qemu-system-s390x -m 2G \
> + -cpu gen16b,ctop=on \
> + -smp cpus=1,sockets=8,cores=4,maxcpus=32 \
> + \
> + -device gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=1 \
> + -device gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=2 \
> + -device gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=3 \
> + \
> + -device gen16b-s390x-cpu,drawer-id=0,book-id=0,socket-id=0,core-id=9 \
> + -device gen16b-s390x-cpu,drawer-id=0,book-id=0,socket-id=0,core-id=14 \
> + \
> + -device gen16b-s390x-cpu,core-id=4,dedicated=on,entitlement=high
> +
> +The entitlement defined for the CPU 4, will only be used after the guest
> +successfully enables vertical polarization by using the PTF instruction.
> diff --git a/docs/system/target-s390x.rst b/docs/system/target-s390x.rst
> index f6f11433c7..94c981e732 100644
> --- a/docs/system/target-s390x.rst
> +++ b/docs/system/target-s390x.rst
> @@ -34,3 +34,4 @@ Architectural features
> .. toctree::
> s390x/bootdevices
> s390x/protvirt
> + s390x/cpu-topology
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 15/20] tests/avocado: s390x cpu topology polarisation
2023-06-30 9:17 ` [PATCH v21 15/20] tests/avocado: s390x cpu topology polarisation Pierre Morel
@ 2023-07-05 8:53 ` Thomas Huth
2023-07-19 11:35 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-05 8:53 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> Polarization is changed on a request from the guest.
> Let's verify the polarization is accordingly set by QEMU.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> tests/avocado/s390_topology.py | 46 ++++++++++++++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
>
> diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
> index 1758ec1f13..2cf731cb1d 100644
> --- a/tests/avocado/s390_topology.py
> +++ b/tests/avocado/s390_topology.py
> @@ -40,6 +40,7 @@ class S390CPUTopology(QemuSystemTest):
> The polarization is changed on a request from the guest.
> """
> timeout = 90
> + event_timeout = 1
When running tests in CI and the machines are very loaded, the tests can be
stalled easily by multiple seconds. So using a timeout of 1 seconds sounds
way too low for me. Please use at least 5 seconds, or maybe even 10.
> KERNEL_COMMON_COMMAND_LINE = ('printk.time=0 '
> 'root=/dev/ram '
> @@ -99,6 +100,15 @@ def kernel_init(self):
> '-initrd', initrd_path,
> '-append', kernel_command_line)
>
> + def system_init(self):
> + self.log.info("System init")
> + exec_command(self, 'mount proc -t proc /proc')
> + time.sleep(0.2)
> + exec_command(self, 'mount sys -t sysfs /sys')
> + time.sleep(0.2)
Hard coded sleeps are ugly... they are prone to race conditions (e.g. on
loaded test systems), and they artificially slow down the test duration.
What about doing all three commands in one statement instead:
exec_command_and_wait_for_pattern(self,
"""mount proc -t proc /proc ;
mount sys -t sysfs /sys ;
/bin/cat /sys/devices/system/cpu/dispatching""",
'0')
?
> + exec_command_and_wait_for_pattern(self,
> + '/bin/cat /sys/devices/system/cpu/dispatching', '0')
> +
> def test_single(self):
> """
> This test checks the simplest topology with a single CPU.
> @@ -194,3 +204,39 @@ def test_hotplug_full(self):
> self.check_topology(3, 1, 1, 1, 'high', False)
> self.check_topology(4, 1, 1, 1, 'medium', False)
> self.check_topology(5, 2, 1, 1, 'high', True)
> +
> +
> + def guest_set_dispatching(self, dispatching):
> + exec_command(self,
> + f'echo {dispatching} > /sys/devices/system/cpu/dispatching')
> + self.vm.event_wait('CPU_POLARIZATION_CHANGE', self.event_timeout)
> + exec_command_and_wait_for_pattern(self,
> + '/bin/cat /sys/devices/system/cpu/dispatching', dispatching)
> +
> +
> + def test_polarisation(self):
> + """
> + This test verifies that QEMU modifies the entitlement change after
> + several guest polarization change requests.
> +
> + :avocado: tags=arch:s390x
> + :avocado: tags=machine:s390-ccw-virtio
> + """
> + self.kernel_init()
> + self.vm.launch()
> + self.wait_until_booted()
> +
> + self.system_init()
> + res = self.vm.qmp('query-cpu-polarization')
> + self.assertEqual(res['return']['polarization'], 'horizontal')
> + self.check_topology(0, 0, 0, 0, 'medium', False)
> +
> + self.guest_set_dispatching('1');
> + res = self.vm.qmp('query-cpu-polarization')
> + self.assertEqual(res['return']['polarization'], 'vertical')
> + self.check_topology(0, 0, 0, 0, 'medium', False)
> +
> + self.guest_set_dispatching('0');
> + res = self.vm.qmp('query-cpu-polarization')
> + self.assertEqual(res['return']['polarization'], 'horizontal')
> + self.check_topology(0, 0, 0, 0, 'medium', False)
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 00/20] s390x: CPU Topology
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
` (19 preceding siblings ...)
2023-06-30 9:17 ` [PATCH v21 20/20] tests/avocado: s390x cpu topology bad move Pierre Morel
@ 2023-07-05 10:02 ` Thomas Huth
2023-07-19 15:27 ` Pierre Morel
20 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-05 10:02 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
...
> Testing
> =======
>
> To use the QEMU patches, you will need Linux V6-rc1 or newer,
> or use the following Linux mainline patches:
>
> f5ecfee94493 2022-07-20 KVM: s390: resetting the Topology-Change-Report
> 24fe0195bc19 2022-07-20 KVM: s390: guest support for topology function
> 0130337ec45b 2022-07-20 KVM: s390: Cleanup ipte lock access and SIIF fac..
>
> Currently this code is for KVM only, I have no idea if it is interesting
> to provide a TCG patch. If ever it will be done in another series.
>
> This series provide 12 avocado tests using Fedora-35 kernel and initrd
> image.
Hi Pierre,
the new avocado tests currently fail if you run them on a x86 host. Could
you please add a check that they are properly skipped instead if the
environment does not match? I guess a
self.require_accelerator('kvm')
should do the job...
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests
2023-06-30 9:17 ` [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests Pierre Morel
@ 2023-07-05 10:22 ` Thomas Huth
2023-07-12 19:37 ` Nina Schoetterl-Glausch
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-05 10:22 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> This test takes care to check the changes on different entitlements
> when the guest requests a polarization change.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> tests/avocado/s390_topology.py | 47 ++++++++++++++++++++++++++++++++++
> 1 file changed, 47 insertions(+)
>
> diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
> index 2cf731cb1d..4855e5d7e4 100644
> --- a/tests/avocado/s390_topology.py
> +++ b/tests/avocado/s390_topology.py
> @@ -240,3 +240,50 @@ def test_polarisation(self):
> res = self.vm.qmp('query-cpu-polarization')
> self.assertEqual(res['return']['polarization'], 'horizontal')
> self.check_topology(0, 0, 0, 0, 'medium', False)
> +
> + def test_entitlement(self):
> + """
> + This test verifies that QEMU modifies the polarization
> + after a guest request.
...
> + self.check_topology(0, 0, 0, 0, 'low', False)
> + self.check_topology(1, 0, 0, 0, 'medium', False)
> + self.check_topology(2, 1, 0, 0, 'high', False)
> + self.check_topology(3, 1, 0, 0, 'high', False)
> +
> + self.guest_set_dispatching('1');
> +
> + self.check_topology(0, 0, 0, 0, 'low', False)
> + self.check_topology(1, 0, 0, 0, 'medium', False)
> + self.check_topology(2, 1, 0, 0, 'high', False)
> + self.check_topology(3, 1, 0, 0, 'high', False)
> +
> + self.guest_set_dispatching('0');
> +
> + self.check_topology(0, 0, 0, 0, 'low', False)
> + self.check_topology(1, 0, 0, 0, 'medium', False)
> + self.check_topology(2, 1, 0, 0, 'high', False)
> + self.check_topology(3, 1, 0, 0, 'high', False)
Sorry, I think I'm too blind to see it, but what has changed after the guest
changed the polarization?
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 18/20] tests/avocado: s390x cpu topology test socket full
2023-06-30 9:17 ` [PATCH v21 18/20] tests/avocado: s390x cpu topology test socket full Pierre Morel
@ 2023-07-05 10:26 ` Thomas Huth
2023-07-19 14:21 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-05 10:26 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> This test verifies that QMP set-cpu-topology does not accept
> to overload a socket.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> tests/avocado/s390_topology.py | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
> index cba44bec91..0003b30702 100644
> --- a/tests/avocado/s390_topology.py
> +++ b/tests/avocado/s390_topology.py
> @@ -315,3 +315,28 @@ def test_dedicated(self):
> self.guest_set_dispatching('0');
>
> self.check_topology(0, 0, 0, 0, 'high', True)
> +
> + def test_socket_full(self):
> + """
> + This test verifies that QEMU does not accept to overload a socket.
> + The socket-id 0 on book-id 0 already contains CPUs 0 and 1 and can
> + not accept any new CPU while socket-id 0 on book-id 1 is free.
> +
> + :avocado: tags=arch:s390x
> + :avocado: tags=machine:s390-ccw-virtio
> + """
> + self.kernel_init()
> + self.vm.add_args('-smp',
> + '3,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
> + self.vm.launch()
> + self.wait_until_booted()
> +
> + self.system_init()
> +
> + res = self.vm.qmp('set-cpu-topology',
> + {'core-id': 2, 'socket-id': 0, 'book-id': 0})
> + self.assertEqual(res['error']['class'], 'GenericError')
> +
> + res = self.vm.qmp('set-cpu-topology',
> + {'core-id': 2, 'socket-id': 0, 'book-id': 1})
> + self.assertEqual(res['return'], {})
Reviewed-by: Thomas Huth <thuth@redhat.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 19/20] tests/avocado: s390x cpu topology dedicated errors
2023-06-30 9:17 ` [PATCH v21 19/20] tests/avocado: s390x cpu topology dedicated errors Pierre Morel
@ 2023-07-05 10:28 ` Thomas Huth
2023-07-19 14:21 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-05 10:28 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> Let's test that QEMU refuses to setup a dedicated CPU with
> low or medium entitlement.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> tests/avocado/s390_topology.py | 48 ++++++++++++++++++++++++++++++++++
> 1 file changed, 48 insertions(+)
Reviewed-by: Thomas Huth <thuth@redhat.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 20/20] tests/avocado: s390x cpu topology bad move
2023-06-30 9:17 ` [PATCH v21 20/20] tests/avocado: s390x cpu topology bad move Pierre Morel
@ 2023-07-05 10:32 ` Thomas Huth
2023-07-19 14:23 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-05 10:32 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 30/06/2023 11.17, Pierre Morel wrote:
> This test verifies that QEMU refuses to move a CPU to an
> unexistant location.
s/unexistant/nonexistent/ ?
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> tests/avocado/s390_topology.py | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
> index 99d9508cef..ea39168b53 100644
> --- a/tests/avocado/s390_topology.py
> +++ b/tests/avocado/s390_topology.py
> @@ -388,3 +388,28 @@ def test_dedicated_error(self):
> res = self.vm.qmp('set-cpu-topology',
> {'core-id': 0, 'entitlement': 'medium', 'dedicated': False})
> self.assertEqual(res['return'], {})
> +
> + def test_move_error(self):
> + """
> + This test verifies that QEMU refuses to move a CPU to an
> + unexistant location
s/unexistant/nonexistent/ ?
With the words fixed:
Reviewed-by: Thomas Huth <thuth@redhat.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug
2023-07-04 10:32 ` Thomas Huth
@ 2023-07-12 11:20 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 11:20 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/4/23 12:32, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> The topology information are attributes of the CPU and are
>> specified during the CPU device creation.
>>
>> On hot plug we:
>> - calculate the default values for the topology for drawers,
>> books and sockets in the case they are not specified.
>> - verify the CPU attributes
>> - check that we have still room on the desired socket
>>
>> The possibility to insert a CPU in a mask is dependent on the
>> number of cores allowed in a socket, a book or a drawer, the
>> checking is done during the hot plug of the CPU to have an
>> immediate answer.
>>
>> If the complete topology is not specified, the core is added
>> in the physical topology based on its core ID and it gets
>> defaults values for the modifier attributes.
>>
>> This way, starting QEMU without specifying the topology can
>> still get some advantage of the CPU topology.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
> ...
>> diff --git a/include/hw/s390x/cpu-topology.h
>> b/include/hw/s390x/cpu-topology.h
>> new file mode 100644
>> index 0000000000..9164ac00a7
>> --- /dev/null
>> +++ b/include/hw/s390x/cpu-topology.h
>> @@ -0,0 +1,54 @@
>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>> +/*
>> + * CPU Topology
>> + *
>> + * Copyright IBM Corp. 2022,2023
>
> Nit: Add a space after the comma ?
thx
>
>> + * Author(s): Pierre Morel <pmorel@linux.ibm.com>
>> + *
>> + */
>> +#ifndef HW_S390X_CPU_TOPOLOGY_H
>> +#define HW_S390X_CPU_TOPOLOGY_H
>> +
>> +#ifndef CONFIG_USER_ONLY
>> +
>> +#include "qemu/queue.h"
>> +#include "hw/boards.h"
>> +#include "qapi/qapi-types-machine-target.h"
>> +
>> +typedef struct S390Topology {
>> + uint8_t *cores_per_socket;
>> +} S390Topology;
>
> So S390Topology has only one entry, "cores_per_socket" here...
>
> ...
>> diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
>> new file mode 100644
>> index 0000000000..b163c17f8f
>> --- /dev/null
>> +++ b/hw/s390x/cpu-topology.c
>> @@ -0,0 +1,264 @@
>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>> +/*
>> + * CPU Topology
>> + *
>> + * Copyright IBM Corp. 2022,2023
>> + * Author(s): Pierre Morel <pmorel@linux.ibm.com>
>> + *
>> + * S390 topology handling can be divided in two parts:
>> + *
>> + * - The first part in this file is taking care of all common functions
>> + * used by KVM and TCG to create and modify the topology.
>> + *
>> + * - The second part, building the topology information data for the
>> + * guest with CPU and KVM specificity will be implemented inside
>> + * the target/s390/kvm sub tree.
>> + */
>> +
>> +#include "qemu/osdep.h"
>> +#include "qapi/error.h"
>> +#include "qemu/error-report.h"
>> +#include "hw/qdev-properties.h"
>> +#include "hw/boards.h"
>> +#include "target/s390x/cpu.h"
>> +#include "hw/s390x/s390-virtio-ccw.h"
>> +#include "hw/s390x/cpu-topology.h"
>> +
>> +/*
>> + * s390_topology is used to keep the topology information.
>> + * .cores_per_socket: tracks information on the count of cores
>> + * per socket.
>> + * .smp: keeps track of the machine topology.
>> + *
>
> ... but the description talks about ".smp" here, too, which never
> seems to be added. Leftover from a previous iteration?
> (also: please remove the empty line at the end of the comment)
right, thx
>
>> + */
>> +S390Topology s390_topology = {
>> + /* will be initialized after the cpu model is realized */
>> + .cores_per_socket = NULL,
>> +};
>> +
>> +/**
>> + * s390_socket_nb:
>> + * @cpu: s390x CPU
>> + *
>> + * Returns the socket number used inside the cores_per_socket array
>> + * for a topology tree entry
>> + */
>> +static int __s390_socket_nb(int drawer_id, int book_id, int socket_id)
>
> Please don't use function names starting with double underscores. This
> namespace is reserved by the C standard.
> Maybe "s390_socket_nb_from_ids" ?
OK
>
>> +{
>> + return (drawer_id * current_machine->smp.books + book_id) *
>> + current_machine->smp.sockets + socket_id;
>> +}
>> +
>> +/**
>> + * s390_socket_nb:
>> + * @cpu: s390x CPU
>> + *
>> + * Returns the socket number used inside the cores_per_socket array
>> + * for a cpu.
>> + */
>> +static int s390_socket_nb(S390CPU *cpu)
>> +{
>> + return __s390_socket_nb(cpu->env.drawer_id, cpu->env.book_id,
>> + cpu->env.socket_id);
>> +}
>> +
>> +/**
>> + * s390_has_topology:
>> + *
>> + * Return value: if the topology is supported by the machine.
>
> "Return: true if the topology is supported by the machine"
>
> (QEMU uses kerneldoc style, so it's just "Return:" and not "Return
> value:", see e.g.
> https://www.kernel.org/doc/html/latest/doc-guide/kernel-doc.html )
OK, thx
>
>> + */
>> +bool s390_has_topology(void)
>> +{
>> + return false;
>> +}
>> +
>> +/**
>> + * s390_topology_init:
>> + * @ms: the machine state where the machine topology is defined
>> + *
>> + * Keep track of the machine topology.
>> + *
>> + * Allocate an array to keep the count of cores per socket.
>> + * The index of the array starts at socket 0 from book 0 and
>> + * drawer 0 up to the maximum allowed by the machine topology.
>> + */
>> +static void s390_topology_init(MachineState *ms)
>> +{
>> + CpuTopology *smp = &ms->smp;
>> +
>> + s390_topology.cores_per_socket = g_new0(uint8_t, smp->sockets *
>> + smp->books * smp->drawers);
>> +}
>> +
>> +/**
>> + * s390_topology_cpu_default:
>> + * @cpu: pointer to a S390CPU
>> + * @errp: Error pointer
>> + *
>> + * Setup the default topology if no attributes are already set.
>> + * Passing a CPU with some, but not all, attributes set is considered
>> + * an error.
>> + *
>> + * The function calculates the (drawer_id, book_id, socket_id)
>> + * topology by filling the cores starting from the first socket
>> + * (0, 0, 0) up to the last (smp->drawers, smp->books, smp->sockets).
>> + *
>> + * CPU type and dedication have defaults values set in the
>> + * s390x_cpu_properties, entitlement must be adjust depending on the
>> + * dedication.
>> + *
>> + * Returns false if it is impossible to setup a default topology
>> + * true otherwise.
>> + */
>> +static bool s390_topology_cpu_default(S390CPU *cpu, Error **errp)
>> +{
>> + CpuTopology *smp = ¤t_machine->smp;
>> + CPUS390XState *env = &cpu->env;
>> +
>> + /* All geometry topology attributes must be set or all unset */
>> + if ((env->socket_id < 0 || env->book_id < 0 || env->drawer_id <
>> 0) &&
>> + (env->socket_id >= 0 || env->book_id >= 0 || env->drawer_id
>> >= 0)) {
>> + error_setg(errp,
>> + "Please define all or none of the topology
>> geometry attributes");
>> + return false;
>> + }
>> +
>> + /* Check if one of the geometry topology is unset */
>> + if (env->socket_id < 0) {
>> + /* Calculate default geometry topology attributes */
>> + env->socket_id = s390_std_socket(env->core_id, smp);
>> + env->book_id = s390_std_book(env->core_id, smp);
>> + env->drawer_id = s390_std_drawer(env->core_id, smp);
>> + }
>> +
>> + /*
>> + * When the user specifies the entitlement as 'auto' on the
>> command line,
>> + * qemu will set the entitlement as:
>
> s/qemu/QEMU/
ok
>
>> + * Medium when the CPU is not dedicated.
>> + * High when dedicated is true.
>> + */
>> + if (env->entitlement == S390_CPU_ENTITLEMENT_AUTO) {
>> + if (env->dedicated) {
>> + env->entitlement = S390_CPU_ENTITLEMENT_HIGH;
>> + } else {
>> + env->entitlement = S390_CPU_ENTITLEMENT_MEDIUM;
>> + }
>> + }
>> + return true;
>> +}
>> +
>> +/**
>> + * s390_topology_check:
>> + * @socket_id: socket to check
>> + * @book_id: book to check
>> + * @drawer_id: drawer to check
>> + * @entitlement: entitlement to check
>> + * @dedicated: dedication to check
>> + * @errp: Error pointer
>> + *
>> + * The function checks if the topology
>> + * attributes fits inside the system topology.
>> + *
>> + * Returns false if the specified topology does not match with
>> + * the machine topology.
>> + */
>> +static bool s390_topology_check(uint16_t socket_id, uint16_t book_id,
>> + uint16_t drawer_id, uint16_t
>> entitlement,
>> + bool dedicated, Error **errp)
>> +{
>> + CpuTopology *smp = ¤t_machine->smp;
>> + ERRP_GUARD();
>> +
>> + if (socket_id >= smp->sockets) {
>> + error_setg(errp, "Unavailable socket: %d", socket_id);
>> + return false;
>> + }
>> + if (book_id >= smp->books) {
>> + error_setg(errp, "Unavailable book: %d", book_id);
>> + return false;
>> + }
>> + if (drawer_id >= smp->drawers) {
>> + error_setg(errp, "Unavailable drawer: %d", drawer_id);
>> + return false;
>> + }
>> + if (entitlement >= S390_CPU_ENTITLEMENT__MAX) {
>> + error_setg(errp, "Unknown entitlement: %d", entitlement);
>> + return false;
>> + }
>> + if (dedicated && (entitlement == S390_CPU_ENTITLEMENT_LOW ||
>> + entitlement == S390_CPU_ENTITLEMENT_MEDIUM)) {
>> + error_setg(errp, "A dedicated cpu implies high entitlement");
>
> s/cpu/CPU/ ?
yes OK
>
>> + return false;
>> + }
>> + return true;
>> +}
>> +
>> +/**
>> + * s390_update_cpu_props:
>> + * @ms: the machine state
>> + * @cpu: the CPU for which to update the properties from the
>> environment.
>> + *
>> + */
>> +static void s390_update_cpu_props(MachineState *ms, S390CPU *cpu)
>> +{
>> + CpuInstanceProperties *props;
>> +
>> + props = &ms->possible_cpus->cpus[cpu->env.core_id].props;
>> +
>> + props->socket_id = cpu->env.socket_id;
>> + props->book_id = cpu->env.book_id;
>> + props->drawer_id = cpu->env.drawer_id;
>> +}
>> +
>> +/**
>> + * s390_topology_setup_cpu:
>> + * @ms: MachineState used to initialize the topology structure on
>> + * first call.
>> + * @cpu: the new S390CPU to insert in the topology structure
>> + * @errp: the error pointer
>> + *
>> + * Called from CPU hotplug to check and setup the CPU attributes
>> + * before the CPU is inserted in the topology.
>> + * There is no need to update the MTCR explicitly here because it
>> + * will be updated by KVM on creation of the new CPU.
>> + */
>> +void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error
>> **errp)
>> +{
>> + ERRP_GUARD();
>> + int entry;
>> +
>> + /*
>> + * We do not want to initialize the topology if the cpu model
>
> s/cpu/CPU/
ok
>
>> + * does not support topology, consequently, we have to wait for
>> + * the first CPU to be realized, which realizes the CPU model
>> + * to initialize the topology structures.
>> + *
>> + * s390_topology_setup_cpu() is called from the cpu hotplug.
>> + */
>> + if (!s390_topology.cores_per_socket) {
>> + s390_topology_init(ms);
>> + }
>> +
>> + if (!s390_topology_cpu_default(cpu, errp)) {
>> + return;
>> + }
>> +
>> + if (!s390_topology_check(cpu->env.socket_id, cpu->env.book_id,
>> + cpu->env.drawer_id, cpu->env.entitlement,
>> + cpu->env.dedicated, errp)) {
>> + return;
>> + }
>> +
>> + /* Do we still have space in the socket */
>> + entry = s390_socket_nb(cpu);
>> + if (s390_topology.cores_per_socket[entry] >=
>> current_machine->smp.cores) {
>> + error_setg(errp, "No more space on this socket");
>> + return;
>> + }
>> +
>> + /* Update the count of cores in sockets */
>> + s390_topology.cores_per_socket[entry] += 1;
>> +
>> + /* topology tree is reflected in props */
>> + s390_update_cpu_props(ms, cpu);
>> +}
>
> Thomas
>
>
Thanks, I make the changes.
Regards,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB
2023-07-04 11:40 ` Thomas Huth
2023-07-04 12:27 ` Thomas Huth
@ 2023-07-12 14:24 ` Pierre Morel
2023-07-12 20:14 ` Thomas Huth
1 sibling, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 14:24 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x, frankja, Claudio Imbrenda
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, berrange, clg
On 7/4/23 13:40, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> On interception of STSI(15.1.x) the System Information Block
>> (SYSIB) is built from the list of pre-ordered topology entries.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
> ...
>> diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
>> index 7ebd5e05b6..6e7d041b01 100644
>> --- a/target/s390x/cpu.h
>> +++ b/target/s390x/cpu.h
>> @@ -569,6 +569,29 @@ typedef struct SysIB_322 {
>> } SysIB_322;
>> QEMU_BUILD_BUG_ON(sizeof(SysIB_322) != 4096);
>> +/*
>> + * Topology Magnitude fields (MAG) indicates the maximum number of
>> + * topology list entries (TLE) at the corresponding nesting level.
>> + */
>> +#define S390_TOPOLOGY_MAG 6
>> +#define S390_TOPOLOGY_MAG6 0
>> +#define S390_TOPOLOGY_MAG5 1
>> +#define S390_TOPOLOGY_MAG4 2
>> +#define S390_TOPOLOGY_MAG3 3
>> +#define S390_TOPOLOGY_MAG2 4
>> +#define S390_TOPOLOGY_MAG1 5
>> +/* Configuration topology */
>> +typedef struct SysIB_151x {
>> + uint8_t reserved0[2];
>> + uint16_t length;
>> + uint8_t mag[S390_TOPOLOGY_MAG];
>> + uint8_t reserved1;
>> + uint8_t mnest;
>> + uint32_t reserved2;
>> + char tle[];
>> +} SysIB_151x;
>> +QEMU_BUILD_BUG_ON(sizeof(SysIB_151x) != 16);
>> +
>> typedef union SysIB {
>> SysIB_111 sysib_111;
>> SysIB_121 sysib_121;
>> @@ -576,9 +599,62 @@ typedef union SysIB {
>> SysIB_221 sysib_221;
>> SysIB_222 sysib_222;
>> SysIB_322 sysib_322;
>> + SysIB_151x sysib_151x;
>> } SysIB;
>> QEMU_BUILD_BUG_ON(sizeof(SysIB) != 4096);
>> +/*
>> + * CPU Topology List provided by STSI with fc=15 provides a list
>> + * of two different Topology List Entries (TLE) types to specify
>> + * the topology hierarchy.
>> + *
>> + * - Container Topology List Entry
>> + * Defines a container to contain other Topology List Entries
>> + * of any type, nested containers or CPU.
>> + * - CPU Topology List Entry
>> + * Specifies the CPUs position, type, entitlement and polarization
>> + * of the CPUs contained in the last Container TLE.
>> + *
>> + * There can be theoretically up to five levels of containers, QEMU
>> + * uses only three levels, the drawer's, book's and socket's level.
>> + *
>> + * A container with a nesting level (NL) greater than 1 can only
>> + * contain another container of nesting level NL-1.
>> + *
>> + * A container of nesting level 1 (socket), contains as many CPU TLE
>> + * as needed to describe the position and qualities of all CPUs inside
>> + * the container.
>> + * The qualities of a CPU are polarization, entitlement and type.
>> + *
>> + * The CPU TLE defines the position of the CPUs of identical qualities
>> + * using a 64bits mask which first bit has its offset defined by
>> + * the CPU address orgin field of the CPU TLE like in:
>> + * CPU address = origin * 64 + bit position within the mask
>> + *
>> + */
>> +/* Container type Topology List Entry */
>> +typedef struct SysIBTl_container {
>> + uint8_t nl;
>> + uint8_t reserved[6];
>> + uint8_t id;
>> +} SysIBTl_container;
>
> Why mixing CamelCase with underscore-style here? SysIBTlContainer
> would look more natural, I think?
OK, what about SYSIBContainerListEntry ?
>
>> +QEMU_BUILD_BUG_ON(sizeof(SysIBTl_container) != 8);
>> +
>> +/* CPU type Topology List Entry */
>> +typedef struct SysIBTl_cpu {
>> + uint8_t nl;
>> + uint8_t reserved0[3];
>> +#define SYSIB_TLE_POLARITY_MASK 0x03
>> +#define SYSIB_TLE_DEDICATED 0x04
>> + uint8_t flags;
>> + uint8_t type;
>> + uint16_t origin;
>> + uint64_t mask;
>> +} SysIBTl_cpu;
>
> dito, maybe better SysIBTlCpu ?
What about SysIBCPUListEntry ?
>
>> +QEMU_BUILD_BUG_ON(sizeof(SysIBTl_cpu) != 16);
>> +
>> +void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr,
>> uint8_t ar);
>> +
>> /* MMU defines */
>> #define ASCE_ORIGIN (~0xfffULL) /* segment table
>> origin */
>> #define ASCE_SUBSPACE 0x200 /* subspace group
>> control */
>> diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
>> index b163c17f8f..ca1634d0ce 100644
>> --- a/hw/s390x/cpu-topology.c
>> +++ b/hw/s390x/cpu-topology.c
>> @@ -29,11 +29,13 @@
>> * .cores_per_socket: tracks information on the count of cores
>> * per socket.
>> * .smp: keeps track of the machine topology.
>> - *
>> + * .list: queue the topology entries inside which
>> + * we keep the information on the CPU topology.
>
> The comment does not match the code below.
a left over I modify this. Thanks.
>
>> */
>> S390Topology s390_topology = {
>> /* will be initialized after the cpu model is realized */
>> .cores_per_socket = NULL,
>> + .polarization = S390_CPU_POLARIZATION_HORIZONTAL,
>> };
>> /**
>> diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
>> index 3ac7ec9acf..5ea358cbb0 100644
>> --- a/target/s390x/kvm/kvm.c
>> +++ b/target/s390x/kvm/kvm.c
>> @@ -1919,9 +1919,12 @@ static int handle_stsi(S390CPU *cpu)
>> if (run->s390_stsi.sel1 != 2 || run->s390_stsi.sel2 != 2) {
>> return 0;
>> }
>> - /* Only sysib 3.2.2 needs post-handling for now. */
>> insert_stsi_3_2_2(cpu, run->s390_stsi.addr,
>> run->s390_stsi.ar);
>> return 0;
>> + case 15:
>> + insert_stsi_15_1_x(cpu, run->s390_stsi.sel2,
>> run->s390_stsi.addr,
>> + run->s390_stsi.ar);
>> + return 0;
>> default:
>> return 0;
>> }
>> diff --git a/target/s390x/kvm/stsi-topology.c
>> b/target/s390x/kvm/stsi-topology.c
>> new file mode 100644
>> index 0000000000..0b789450da
>> --- /dev/null
>> +++ b/target/s390x/kvm/stsi-topology.c
>> @@ -0,0 +1,310 @@
>> +/* SPDX-License-Identifier: GPL-2.0-or-later */
>> +/*
>> + * QEMU S390x CPU Topology
>> + *
>> + * Copyright IBM Corp. 2022,2023
>> + * Author(s): Pierre Morel <pmorel@linux.ibm.com>
>> + *
>> + */
>> +#include "qemu/osdep.h"
>> +#include "cpu.h"
>> +#include "hw/s390x/pv.h"
>> +#include "hw/sysbus.h"
>> +#include "hw/s390x/sclp.h"
>> +#include "hw/s390x/cpu-topology.h"
>> +
>> +/**
>> + * fill_container:
>> + * @p: The address of the container TLE to fill
>> + * @level: The level of nesting for this container
>> + * @id: The container receives a unique ID inside its own container
>> + *
>> + * Returns the next free TLE entry.
>> + */
>> +static char *fill_container(char *p, int level, int id)
>> +{
>> + SysIBTl_container *tle = (SysIBTl_container *)p;
>> +
>> + tle->nl = level;
>> + tle->id = id;
>> + return p + sizeof(*tle);
>> +}
>> +
>> +/**
>> + * fill_tle_cpu:
>> + * @p: The address of the CPU TLE to fill
>> + * @entry: a pointer to the S390TopologyEntry defining this
>> + * CPU container.
>> + *
>> + * Returns the next free TLE entry.
>> + */
>> +static char *fill_tle_cpu(char *p, S390TopologyEntry *entry)
>> +{
>> + SysIBTl_cpu *tle = (SysIBTl_cpu *)p;
>> + s390_topology_id topology_id = entry->id;
>> +
>> + tle->nl = 0;
>> + if (topology_id.dedicated) {
>> + tle->flags = SYSIB_TLE_DEDICATED;
>> + }
>> + tle->flags |= topology_id.entitlement;
>
> If it was not dedicated, the "|=" might operate with a random value
> here. Better pre-initialize flags with 0, or change the order of the
> operations here:
>
> tle->flags = topology_id.entitlement;
> if (topology_id.dedicated) {
> tle->flags |= SYSIB_TLE_DEDICATED;
> }
oh, yes.
>
>> + tle->type = topology_id.type;
>> + tle->origin = cpu_to_be16(topology_id.origin * 64);
>> + tle->mask = cpu_to_be64(entry->mask);
>> + return p + sizeof(*tle);
>> +}
>> +
>> +/*
>> + * Macro to check that the size of data after increment
>> + * will not get bigger than the size of the SysIB.
>> + */
>> +#define SYSIB_GUARD(data, x) do { \
>> + data += x; \
>> + if (data > sizeof(SysIB)) { \
>> + return 0; \
>> + } \
>> + } while (0)
>> +
>> +/**
>> + * stsi_topology_fill_sysib:
>> + * @p: A pointer to the position of the first TLE
>> + * @level: The nested level wanted by the guest
>> + *
>> + * Fill the SYSIB with the topology information as described in
>> + * the PoP, nesting containers as appropriate, with the maximum
>> + * nesting limited by @level.
>> + *
>> + * Return value:
>> + * On success: the size of the SysIB_15x after being filled with TLE.
>> + * On error: 0 in the case we would overrun the end of the SysIB.
>> + */
>> +static int stsi_topology_fill_sysib(S390TopologyList *topology_list,
>> + char *p, int level)
>> +{
>> + S390TopologyEntry *entry;
>> + int last_drawer = -1;
>> + int last_book = -1;
>> + int last_socket = -1;
>> + int drawer_id = 0;
>> + int book_id = 0;
>> + int socket_id = 0;
>> + int n = sizeof(SysIB_151x);
>> +
>> + QTAILQ_FOREACH(entry, topology_list, next) {
>> + bool drawer_change = last_drawer != entry->id.drawer;
>> + bool book_change = drawer_change || last_book !=
>> entry->id.book;
>> + bool socket_change = book_change || last_socket !=
>> entry->id.socket;
>> +
>> + /* If we reach the sentinel get out */
>> + if (entry->id.sentinel) {
>> + break;
>> + }
>> +
>> + if (level > 3 && drawer_change) {
>> + SYSIB_GUARD(n, sizeof(SysIBTl_container));
>> + p = fill_container(p, 3, drawer_id++);
>> + book_id = 0;
>> + }
>> + if (level > 2 && book_change) {
>> + SYSIB_GUARD(n, sizeof(SysIBTl_container));
>> + p = fill_container(p, 2, book_id++);
>> + socket_id = 0;
>> + }
>> + if (socket_change) {
>> + SYSIB_GUARD(n, sizeof(SysIBTl_container));
>> + p = fill_container(p, 1, socket_id++);
>> + }
>> +
>> + SYSIB_GUARD(n, sizeof(SysIBTl_cpu));
>> + p = fill_tle_cpu(p, entry);
>> + last_drawer = entry->id.drawer;
>> + last_book = entry->id.book;
>> + last_socket = entry->id.socket;
>> + }
>> +
>> + return n;
>> +}
>> +
>> +/**
>> + * setup_stsi:
>> + * sysib: pointer to a SysIB to be filled with SysIB_151x data
>> + * level: Nested level specified by the guest
>> + *
>> + * Setup the SYSIB for STSI 15.1, the header as well as the description
>> + * of the topology.
>> + */
>> +static int setup_stsi(S390TopologyList *topology_list, SysIB_151x
>> *sysib,
>> + int level)
>> +{
>> + sysib->mnest = level;
>> + switch (level) {
>> + case 4:
>> + sysib->mag[S390_TOPOLOGY_MAG4] = current_machine->smp.drawers;
>> + sysib->mag[S390_TOPOLOGY_MAG3] = current_machine->smp.books;
>> + sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.sockets;
>> + sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
>> + break;
>> + case 3:
>> + sysib->mag[S390_TOPOLOGY_MAG3] = current_machine->smp.drawers *
>> + current_machine->smp.books;
>> + sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.sockets;
>> + sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
>> + break;
>> + case 2:
>> + sysib->mag[S390_TOPOLOGY_MAG2] = current_machine->smp.drawers *
>> + current_machine->smp.books *
>> + current_machine->smp.sockets;
>> + sysib->mag[S390_TOPOLOGY_MAG1] = current_machine->smp.cores;
>> + break;
>> + }
>> +
>> + return stsi_topology_fill_sysib(topology_list, sysib->tle, level);
>> +}
>> +
>> +/**
>> + * s390_topology_add_cpu_to_entry:
>> + * @entry: Topology entry to setup
>> + * @cpu: the S390CPU to add
>> + *
>> + * Set the core bit inside the topology mask and
>> + * increments the number of cores for the socket.
>
> The second part of the sentence does not seem to be done here anymore?
Right, it is not needed here anymore since this is doe during the STSI
interception.
It was needed during the setup of the topology or during changes,
hotplug or moving a CPU,
which is done in hw/s390/cpu.topology.c
>
>> + */
>> +static void s390_topology_add_cpu_to_entry(S390TopologyEntry *entry,
>> + S390CPU *cpu)
>> +{
>> + set_bit(63 - (cpu->env.core_id % 64), &entry->mask);
>> +}
>> +
>> +/**
>> + * s390_topology_from_cpu:
>> + * @cpu: The S390CPU
>> + *
>> + * Initialize the topology id from the CPU environment.
>> + */
>> +static s390_topology_id s390_topology_from_cpu(S390CPU *cpu)
>> +{
>> + s390_topology_id topology_id = {0};
>> +
>> + topology_id.drawer = cpu->env.drawer_id;
>> + topology_id.book = cpu->env.book_id;
>> + topology_id.socket = cpu->env.socket_id;
>> + topology_id.origin = cpu->env.core_id / 64;
>> + topology_id.type = S390_TOPOLOGY_CPU_IFL;
>> + topology_id.dedicated = cpu->env.dedicated;
>> +
>> + if (s390_topology.polarization == S390_CPU_POLARIZATION_VERTICAL) {
>> + topology_id.entitlement = cpu->env.entitlement;
>> + }
>> +
>> + return topology_id;
>> +}
>> +
>> +/**
>> + * s390_topology_insert:
>> + * @cpu: s390CPU insert.
>
> "s390CPU insert" sounds like a weird description for @cpu
yes I think "S390CPU to be inserted in the topology list" is better
>
>> + *
>> + * Parse the topology list to find if the entry already
>> + * exist and add the core in it.
>> + * If it does not exist, allocate a new entry and insert
>> + * it in the queue from lower id to greater id.
>> + */
>> +static void s390_topology_insert(S390TopologyList *topology_list,
>> S390CPU *cpu)
>> +{
>> + s390_topology_id id = s390_topology_from_cpu(cpu);
>> + S390TopologyEntry *entry = NULL;
>> + S390TopologyEntry *tmp = NULL;
>> +
>> + QTAILQ_FOREACH(tmp, topology_list, next) {
>> + if (id.id == tmp->id.id) {
>> + s390_topology_add_cpu_to_entry(tmp, cpu);
>> + return;
>> + } else if (id.id < tmp->id.id) {
>> + entry = g_malloc0(sizeof(S390TopologyEntry));
>> + entry->id.id = id.id;
>> + s390_topology_add_cpu_to_entry(entry, cpu);
>> + QTAILQ_INSERT_BEFORE(tmp, entry, next);
>> + return;
>> + }
>> + }
>> +}
>> +
>> +/**
>> + * s390_topology_fill_list_sorted:
>> + *
>> + * Loop over all CPU and insert it at the right place
>> + * inside the TLE entry list.
>> + * Fill the S390Topology list with entries according to the order
>> + * specified by the PoP.
>> + */
>> +static void s390_topology_fill_list_sorted(S390TopologyList
>> *topology_list)
>> +{
>> + CPUState *cs;
>> +
>> + CPU_FOREACH(cs) {
>> + s390_topology_insert(topology_list, S390_CPU(cs));
>> + }
>> +}
>> +
>> +/**
>> + * s390_topology_empty_list:
>> + *
>> + * Clear all entries in the S390Topology list except the sentinel.
>> + */
>> +static void s390_topology_empty_list(S390TopologyList *topology_list)
>> +{
>> + S390TopologyEntry *entry = NULL;
>> + S390TopologyEntry *tmp = NULL;
>> +
>> + QTAILQ_FOREACH_SAFE(entry, topology_list, next, tmp) {
>> + QTAILQ_REMOVE(topology_list, entry, next);
>> + g_free(entry);
>> + }
>> +}
>> +
>> +/**
>> + * insert_stsi_15_1_x:
>> + * cpu: the CPU doing the call for which we set CC
>> + * sel2: the selector 2, containing the nested level
>> + * addr: Guest logical address of the guest SysIB
>> + * ar: the access register number
>> + *
>> + * Create a list head for the Topology entries and initialize it.
>
> s/Topology/topology/
OK
>
>> + * Insert the first entry as a sentinelle.
>
> s/sentinelle/sentinel/
thx
>
>> + * Emulate STSI 15.1.x, that is, perform all necessary checks and
>> + * fill the SYSIB.
>> + * In case the topology description is too long to fit into the SYSIB,
>> + * set CC=3 and abort without writing the SYSIB.
>> + */
>> +void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr,
>> uint8_t ar)
>> +{
>> + S390TopologyList topology_list;
>> + S390TopologyEntry *entry;
>> + SysIB sysib = {0};
>> + int length;
>> +
>> + if (!s390_has_topology() || sel2 < 2 || sel2 >
>> SCLP_READ_SCP_INFO_MNEST) {
>> + setcc(cpu, 3);
>> + return;
>> + }
>> +
>> + QTAILQ_INIT(&topology_list);
>> + entry = g_malloc0(sizeof(S390TopologyEntry));
>> + entry->id.sentinel = 0xff;
>> + QTAILQ_INSERT_HEAD(&topology_list, entry, next);
>> +
>> + s390_topology_fill_list_sorted(&topology_list);
>> +
>> + length = setup_stsi(&topology_list, &sysib.sysib_151x, sel2);
>> +
>> + if (!length) {
>> + setcc(cpu, 3);
I forgot to free the buffers here... will be added like
if (!length) {
s390_topology_empty_list(&topology_list);
setcc(cpu, 3);
return;
}
>> + return;
>> + }
>> +
>> + sysib.sysib_151x.length = cpu_to_be16(length);
>> + s390_cpu_virt_mem_write(cpu, addr, ar, &sysib, length);
>> + setcc(cpu, 0);
>
> s390_cpu_virt_mem_write() could fail, I think in that case you should
> not change the CC value here?
right, thanks.
Regards,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 06/20] s390x/cpu topology: interception of PTF instruction
2023-07-04 12:16 ` Thomas Huth
@ 2023-07-12 14:40 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 14:40 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/4/23 14:16, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> When the host supports the CPU topology facility, the PTF
>> instruction with function code 2 is interpreted by the SIE,
>> provided that the userland hypervisor activates the interpretation
>> by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension.
>>
>> The PTF instructions with function code 0 and 1 are intercepted
>> and must be emulated by the userland hypervisor.
>>
>> During RESET all CPU of the configuration are placed in
>> horizontal polarity.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
>> ---
>> include/hw/s390x/s390-virtio-ccw.h | 6 ++++
>> hw/s390x/cpu-topology.c | 54 ++++++++++++++++++++++++++++++
>> target/s390x/kvm/kvm.c | 11 ++++++
>> 3 files changed, 71 insertions(+)
>
>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
>
Thanks,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command
2023-07-04 12:53 ` Thomas Huth
@ 2023-07-12 14:45 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 14:45 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/4/23 14:53, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> The modification of the CPU attributes are done through a monitor
>> command.
>>
>> It allows to move the core inside the topology tree to optimize
>> the cache usage in the case the host's hypervisor previously
>> moved the CPU.
>>
>> The same command allows to modify the CPU attributes modifiers
>> like polarization entitlement and the dedicated attribute to notify
>> the guest if the host admin modified scheduling or dedication of a vCPU.
>>
>> With this knowledge the guest has the possibility to optimize the
>> usage of the vCPUs.
>>
>> The command has a feature unstable for the moment.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
> ...
>> diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
>> index 1af70a5049..dfc4cb42a4 100644
>> --- a/hw/s390x/cpu-topology.c
>> +++ b/hw/s390x/cpu-topology.c
>> @@ -23,6 +23,7 @@
>> #include "target/s390x/cpu.h"
>> #include "hw/s390x/s390-virtio-ccw.h"
>> #include "hw/s390x/cpu-topology.h"
>> +#include "qapi/qapi-commands-machine-target.h"
>> /*
>> * s390_topology is used to keep the topology information.
>> @@ -260,6 +261,29 @@ static bool s390_topology_check(uint16_t
>> socket_id, uint16_t book_id,
>> return true;
>> }
>> +/**
>> + * s390_topology_need_report
>> + * @cpu: Current cpu
>> + * @drawer_id: future drawer ID
>> + * @book_id: future book ID
>> + * @socket_id: future socket ID
>> + * @entitlement: future entitlement
>> + * @dedicated: future dedicated
>> + *
>> + * A modified topology change report is needed if the topology
>> + * tree or the topology attributes change.
>> + */
>> +static bool s390_topology_need_report(S390CPU *cpu, int drawer_id,
>> + int book_id, int socket_id,
>> + uint16_t entitlement, bool
>> dedicated)
>> +{
>> + return cpu->env.drawer_id != drawer_id ||
>> + cpu->env.book_id != book_id ||
>> + cpu->env.socket_id != socket_id ||
>> + cpu->env.entitlement != entitlement ||
>> + cpu->env.dedicated != dedicated;
>> +}
>> +
>> /**
>> * s390_update_cpu_props:
>> * @ms: the machine state
>> @@ -329,3 +353,113 @@ void s390_topology_setup_cpu(MachineState *ms,
>> S390CPU *cpu, Error **errp)
>> /* topology tree is reflected in props */
>> s390_update_cpu_props(ms, cpu);
>> }
>> +
>> +static void s390_change_topology(uint16_t core_id,
>> + bool has_socket_id, uint16_t
>> socket_id,
>> + bool has_book_id, uint16_t book_id,
>> + bool has_drawer_id, uint16_t
>> drawer_id,
>> + bool has_entitlement,
>> + CpuS390Entitlement entitlement,
>> + bool has_dedicated, bool dedicated,
>> + Error **errp)
>> +{
>> + MachineState *ms = current_machine;
>> + int old_socket_entry;
>> + int new_socket_entry;
>> + bool report_needed;
>> + S390CPU *cpu;
>> + ERRP_GUARD();
>> +
>> + cpu = s390_cpu_addr2state(core_id);
>> + if (!cpu) {
>> + error_setg(errp, "Core-id %d does not exist!", core_id);
>> + return;
>> + }
>> +
>> + /* Get attributes not provided from cpu and verify the new
>> topology */
>> + if (!has_socket_id) {
>> + socket_id = cpu->env.socket_id;
>> + }
>> + if (!has_book_id) {
>> + book_id = cpu->env.book_id;
>> + }
>> + if (!has_drawer_id) {
>> + drawer_id = cpu->env.drawer_id;
>> + }
>> + if (!has_dedicated) {
>> + dedicated = cpu->env.dedicated;
>> + }
>> +
>> + /*
>> + * When the user specifies the entitlement as 'auto' on the
>> command line,
>> + * qemu will set the entitlement as:
>> + * Medium when the CPU is not dedicated.
>> + * High when dedicated is true.
>> + */
>> + if (!has_entitlement || (entitlement ==
>> S390_CPU_ENTITLEMENT_AUTO)) {
>> + if (dedicated) {
>> + entitlement = S390_CPU_ENTITLEMENT_HIGH;
>> + } else {
>> + entitlement = S390_CPU_ENTITLEMENT_MEDIUM;
>> + }
>> + }
>> +
>> + if (!s390_topology_check(socket_id, book_id, drawer_id,
>> + entitlement, dedicated, errp))
>> + return;
>
> Missing curly braces here.
> Not sure why this isn't caught by checkpatch.pl properly :-(
>
> Thomas
>
Yes indeed.
I add the curly braces.
Thanks
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 09/20] machine: adding s390 topology to query-cpu-fast
2023-07-04 12:55 ` Thomas Huth
@ 2023-07-12 15:44 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 15:44 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/4/23 14:55, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> S390x provides two more topology attributes, entitlement and dedication.
>>
>> Let's add these CPU attributes to the QAPI command query-cpu-fast.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> qapi/machine.json | 9 ++++++++-
>> target/s390x/cpu.c | 4 ++++
>> 2 files changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/qapi/machine.json b/qapi/machine.json
>> index 08245beea1..a1920cb78d 100644
>> --- a/qapi/machine.json
>> +++ b/qapi/machine.json
>> @@ -56,10 +56,17 @@
>> # Additional information about a virtual S390 CPU
>> #
>> # @cpu-state: the virtual CPU's state
>> +# @dedicated: the virtual CPU's dedication (since 8.1)
>> +# @entitlement: the virtual CPU's entitlement (since 8.1)
>> #
>> # Since: 2.12
>> ##
>> -{ 'struct': 'CpuInfoS390', 'data': { 'cpu-state': 'CpuS390State' } }
>> +{ 'struct': 'CpuInfoS390',
>> + 'data': { 'cpu-state': 'CpuS390State',
>> + 'dedicated': 'bool',
>> + 'entitlement': 'CpuS390Entitlement'
>
> Would it make sense to make them optional and only report those if the
> topology feature is enabled?
>
> Thomas
>
I think you are right, I make them optional, it has no sense if the
architecture does support topology.
Thanks,
Pierre
>
>> + }
>> +}
>> ##
>> # @CpuInfoFast:
>> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
>> index 74405beb51..01938635eb 100644
>> --- a/target/s390x/cpu.c
>> +++ b/target/s390x/cpu.c
>> @@ -146,6 +146,10 @@ static void s390_query_cpu_fast(CPUState *cpu,
>> CpuInfoFast *value)
>> S390CPU *s390_cpu = S390_CPU(cpu);
>> value->u.s390x.cpu_state = s390_cpu->env.cpu_state;
>> +#if !defined(CONFIG_USER_ONLY)
>> + value->u.s390x.dedicated = s390_cpu->env.dedicated;
>> + value->u.s390x.entitlement = s390_cpu->env.entitlement;
>> +#endif
>> }
>> /* S390CPUClass::reset() */
>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 10/20] machine: adding s390 topology to info hotpluggable-cpus
2023-07-04 12:59 ` Thomas Huth
@ 2023-07-12 16:02 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 16:02 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/4/23 14:59, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> S390 topology adds books and drawers topology containers.
>> Let's add these to the HMP information for hotpluggable cpus.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
>> ---
>> hw/core/machine-hmp-cmds.c | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>> diff --git a/hw/core/machine-hmp-cmds.c b/hw/core/machine-hmp-cmds.c
>> index c3e55ef9e9..f247ba3206 100644
>> --- a/hw/core/machine-hmp-cmds.c
>> +++ b/hw/core/machine-hmp-cmds.c
>> @@ -71,6 +71,12 @@ void hmp_hotpluggable_cpus(Monitor *mon, const
>> QDict *qdict)
>> if (c->has_node_id) {
>> monitor_printf(mon, " node-id: \"%" PRIu64 "\"\n",
>> c->node_id);
>> }
>> + if (c->has_drawer_id) {
>> + monitor_printf(mon, " drawer-id: \"%" PRIu64 "\"\n",
>> c->drawer_id);
>> + }
>> + if (c->has_book_id) {
>> + monitor_printf(mon, " book-id: \"%" PRIu64 "\"\n",
>> c->book_id);
>
> I think the output should be left-aligned (with four spaces at the
> beginning), not right aligned to the colons?
>
> Thomas
>
I think you are right, core-id is not aligned on the colons.
thanks,
Pierre
>
>> + }
>> if (c->has_socket_id) {
>> monitor_printf(mon, " socket-id: \"%" PRIu64 "\"\n",
>> c->socket_id);
>> }
>
>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event
2023-07-04 13:04 ` Thomas Huth
@ 2023-07-12 16:05 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 16:05 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/4/23 15:04, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> When the guest asks to change the polarization this change
>> is forwarded to the upper layer using QAPI.
>> The upper layer is supposed to take according decisions concerning
>> CPU provisioning.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> qapi/machine-target.json | 33 +++++++++++++++++++++++++++++++++
>> hw/s390x/cpu-topology.c | 2 ++
>> 2 files changed, 35 insertions(+)
>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
>
Thanks,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command
2023-07-05 7:58 ` Thomas Huth
@ 2023-07-12 16:12 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 16:12 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/5/23 09:58, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> The query-cpu-polarization qmp command returns the current
>> CPU polarization of the machine.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> qapi/machine-target.json | 29 +++++++++++++++++++++++++++++
>> hw/s390x/cpu-topology.c | 8 ++++++++
>> 2 files changed, 37 insertions(+)
>>
>> diff --git a/qapi/machine-target.json b/qapi/machine-target.json
>> index 1362e43983..1e4b8976aa 100644
>> --- a/qapi/machine-target.json
>> +++ b/qapi/machine-target.json
>> @@ -445,3 +445,32 @@
>> 'features': [ 'unstable' ],
>> 'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
>> }
>> +
>> +##
>> +# @CpuPolarizationInfo:
>> +#
>> +# The result of a cpu polarization
>> +#
>> +# @polarization: the CPU polarization
>> +#
>> +# Since: 8.1
>> +##
>> +{ 'struct': 'CpuPolarizationInfo',
>> + 'data': { 'polarization': 'CpuS390Polarization' },
>> + 'if': { 'all': [ 'TARGET_S390X', 'CONFIG_KVM' ] }
>> +}
>> +
>> +##
>> +# @query-cpu-polarization:
>> +#
>> +# Features:
>> +# @unstable: This command may still be modified.
>> +#
>> +# Returns: the machine polarization
>> +#
>> +# Since: 8.1
>> +##
>> +{ 'command': 'query-cpu-polarization', 'returns':
>> 'CpuPolarizationInfo',
>
> Since this is very specific to s390x, I wonder whether we want to have
> a "s390x" in the command name? 'query-s390x-cpu-polarization'? ... or
> is this getting too long already?
>
> Anyway,
> Reviewed-by: Thomas Huth <thuth@redhat.com>
>
I do not know.I prefer short commands but the interface will mostly be
used by a program, so...
I let it like that unless there is more pressure to change it.
Thanks,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 13/20] docs/s390x/cpu topology: document s390x cpu topology
2023-07-05 8:41 ` Thomas Huth
@ 2023-07-12 16:27 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-12 16:27 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/5/23 10:41, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> Add some basic examples for the definition of cpu topology
>> in s390x.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> MAINTAINERS | 2 +
>> docs/devel/index-internals.rst | 1 +
>> docs/devel/s390-cpu-topology.rst | 170 ++++++++++++++++++++
>> docs/system/s390x/cpu-topology.rst | 240 +++++++++++++++++++++++++++++
>> docs/system/target-s390x.rst | 1 +
>> 5 files changed, 414 insertions(+)
>> create mode 100644 docs/devel/s390-cpu-topology.rst
>> create mode 100644 docs/system/s390x/cpu-topology.rst
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index b8d3e8815c..76f236564c 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -1703,6 +1703,8 @@ S: Supported
>> F: include/hw/s390x/cpu-topology.h
>> F: hw/s390x/cpu-topology.c
>> F: target/s390x/kvm/stsi-topology.c
>> +F: docs/devel/s390-cpu-topology.rst
>> +F: docs/system/s390x/cpu-topology.rst
>> X86 Machines
>> ------------
>> diff --git a/docs/devel/index-internals.rst
>> b/docs/devel/index-internals.rst
>> index e1a93df263..6f81df92bc 100644
>> --- a/docs/devel/index-internals.rst
>> +++ b/docs/devel/index-internals.rst
>> @@ -14,6 +14,7 @@ Details about QEMU's various subsystems including
>> how to add features to them.
>> migration
>> multi-process
>> reset
>> + s390-cpu-topology
>> s390-dasd-ipl
>> tracing
>> vfio-migration
>> diff --git a/docs/devel/s390-cpu-topology.rst
>> b/docs/devel/s390-cpu-topology.rst
>> new file mode 100644
>> index 0000000000..cd36476011
>> --- /dev/null
>> +++ b/docs/devel/s390-cpu-topology.rst
>> @@ -0,0 +1,170 @@
>> +QAPI interface for S390 CPU topology
>> +====================================
>> +
>> +Let's start QEMU with the following command defining 4 CPUs,
>
> Maybe better something like this:
>
> The following sections will explain the S390 CPU topology with the
> help of exemplary output. For this, let's assume that QEMU has been
> started with the following command, defining 4 CPUs.
>
> ?
Absolutely better.
Thanks
>
>> +CPU[0] defined by the -smp argument will have default values:
>> +
>> +.. code-block:: bash
>> +
>> + qemu-system-s390x \
>> + -enable-kvm \
>> + -cpu z14,ctop=on \
>> + -smp 1,drawers=3,books=3,sockets=2,cores=2,maxcpus=36 \
>> + \
>> + -device z14-s390x-cpu,core-id=19,entitlement=high \
>> + -device z14-s390x-cpu,core-id=11,entitlement=low \
>> + -device z14-s390x-cpu,core-id=112,entitlement=high \
>> + ...
>> +
>> +and see the result when using the QAPI interface.
> ...
>> +QAPI command: set-cpu-topology
>> +------------------------------
>> +
>> +The command set-cpu-topology allows to modify the topology tree
>> +or the topology modifiers of a vCPU in the configuration.
>> +
>> +.. code-block:: QMP
>> +
>> + { "execute": "set-cpu-topology",
>> + "arguments": {
>> + "core-id": 11,
>> + "socket-id": 0,
>> + "book-id": 0,
>> + "drawer-id": 0,
>> + "entitlement": "low",
>> + "dedicated": false
>> + }
>> + }
>> + {"return": {}}
>> +
>> +The core-id parameter is the only non optional parameter and every
>> +unspecified parameter keeps its previous value.
>> +
>> +QAPI event CPU_POLARIZATION_CHANGE
>> +----------------------------------
>> +
>> +When a guest is requests a modification of the polarization,
>
> Scratch the word "is".
yes
>
>> +QEMU sends a CPU_POLARIZATION_CHANGE event.
> ...
>> diff --git a/docs/system/s390x/cpu-topology.rst
>> b/docs/system/s390x/cpu-topology.rst
>> new file mode 100644
>> index 0000000000..0535a5d883
>> --- /dev/null
>> +++ b/docs/system/s390x/cpu-topology.rst
>> @@ -0,0 +1,240 @@
>> +CPU topology on s390x
>> +=====================
>> +
>> +Since QEMU 8.1, CPU topology on s390x provides up to 3 levels of
>> +topology containers: drawers, books, sockets, defining a tree shaped
>> +hierarchy.
>
> "drawers, books and sockets. They define a tree-shaped hierarchy."
>
> ?
>
yes, thx
>> +The socket container contains one or more CPU entries.
>
> "The socket container has one or more CPU entries." ?
yes thx
>
>> +Each of these CPU entries consists of a bitmap and three CPU
>> attributes:
>> +
>> +- CPU type
>> +- entitlement
>> +- dedication
>> +
>> +Each bit set in the bitmap correspond to the core-id of a vCPU with
>> +matching the three attribute.
>> +
>> +This documentation provide general information on S390 CPU topology,
>> +how to enable it and on the new CPU attributes.
>> +For information on how to modify the S390 CPU topology and on how to
>> +monitor the polarization change see ``Developer Information``.
>
> It would be nicer to have a proper link here instead. See commit
> d6359e150dbdf84f67add786473fd277a9a442bb for example how to do this in
> our .rst files.
>
>> +Prerequisites
>> +-------------
>> +
>> +To use the CPU topology, you need to run with KVM on a s390x host that
>> +uses the Linux kernel v6.0 or newer (which provide the so-called
>> +``KVM_CAP_S390_CPU_TOPOLOGY`` capability that allows QEMU to signal the
>> +CPU topology facility via the so-called STFLE bit 11 to the VM).
>> +
>> +Enabling CPU topology
>> +---------------------
>> +
>> +Currently, CPU topology is only enabled in the host model by default.
>> +
>> +Enabling CPU topology in a CPU model is done by setting the CPU flag
>> +``ctop`` to ``on`` like in:
>> +
>> +.. code-block:: bash
>> +
>> + -cpu gen16b,ctop=on
>> +
>> +Having the topology disabled by default allows migration between
>> +old and new QEMU without adding new flags.
>> +
>> +Default topology usage
>> +----------------------
>> +
>> +The CPU topology can be specified on the QEMU command line
>> +with the ``-smp`` or the ``-device`` QEMU command arguments.
>> +
>> +Note also that since 7.2 threads are no longer supported in the
>> topology
>> +and the ``-smp`` command line argument accepts only ``threads=1``.
>> +
>> +If none of the containers attributes (drawers, books, sockets) are
>> +specified for the ``-smp`` flag, the number of these containers
>> +is ``1`` .
>
> "Thus the following two options will result in the same topology, for
> example:" ?
Yes thanks
>
>> +.. code-block:: bash
>> +
>> + -smp cpus=5,drawer=1,books=1,sockets=8,cores=4,maxcpus=32
>> +
>> +or
>> +
>> +.. code-block:: bash
>> +
>> + -smp cpus=5,sockets=8,cores=4,maxcpus=32
>> +
>> +When a CPU is defined by the ``-smp`` command argument, its position
>> +inside the topology is calculated by adding the CPUs to the topology
>> +based on the core-id starting with core-0 at position 0 of socket-0,
>> +book-0, drawer-0 and filling all CPUs of socket-0 before to fill
>> socket-1
>> +of book-0 and so on up to the last socket of the last book of the last
>> +drawer.
>> +
>> +When a CPU is defined by the ``-device`` command argument, the
>> +tree topology attributes must be all defined or all not defined.
>> +
>> +.. code-block:: bash
>> +
>> + -device
>> gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=1
>> +
>> +or
>> +
>> +.. code-block:: bash
>> +
>> + -device gen16b-s390x-cpu,core-id=1,dedicated=true
>> +
>> +If none of the tree attributes (drawer, book, sockets), are specified
>> +for the ``-device`` argument, as for all CPUs defined with the ``-smp``
>> +command argument the topology tree attributes will be set by simply
>> +adding the CPUs to the topology based on the core-id starting with
>> +core-0 at position 0 of socket-0, book-0, drawer-0.
>> +
>> +QEMU will not try to solve collisions and will report an error if the
>> +CPU topology, explicitly or implicitly defined on a ``-device``
>> +argument collides with the definition of a CPU implicitely defined
>
> s/implicitely/implicitly/
thx
>
>> +on the ``-smp`` argument.
>> +
>> +When the topology modifier attributes are not defined for the
>> +``-device`` command argument they takes following default values:
>> +
>> +- dedicated: ``false``
>> +- entitlement: ``medium``
>> +
>> +
>> +Hot plug
>> +++++++++
>> +
>> +New CPUs can be plugged using the device_add hmp command as in:
>> +
>> +.. code-block:: bash
>> +
>> + (qemu) device_add gen16b-s390x-cpu,core-id=9
>> +
>> +The same placement of the CPU is derived from the core-id as
>> described above.
>> +
>> +The topology can of course be fully defined:
>> +
>> +.. code-block:: bash
>> +
>> + (qemu) device_add
>> gen16b-s390x-cpu,drawer-id=1,book-id=1,socket-id=2,core-id=1
>> +
>> +
>> +Examples
>> +++++++++
>> +
>> +In the following machine we define 8 sockets with 4 cores each.
>> +
>> +.. code-block:: bash
>> +
>> + $ qemu-system-s390x -m 2G \
>> + -cpu gen16b,ctop=on \
>> + -smp cpus=5,sockets=8,cores=4,maxcpus=32 \
>> + -device host-s390x-cpu,core-id=14 \
>> +
>> +A new CPUs can be plugged using the device_add hmp command as before:
>> +
>> +.. code-block:: bash
>> +
>> + (qemu) device_add gen16b-s390x-cpu,core-id=9
>> +
>> +The core-id defines the placement of the core in the topology by
>> +starting with core 0 in socket 0 up to maxcpus.
>> +
>> +In the example above:
>> +
>> +* There are 5 CPUs provided to the guest with the ``-smp`` command line
>> + They will take the core-ids 0,1,2,3,4
>> + As we have 4 cores in a socket, we have 4 CPUs provided
>> + to the guest in socket 0, with core-ids 0,1,2,3.
>> + The last cpu, with core-id 4, will be on socket 1.
>> +
>> +* the core with ID 14 provided by the ``-device`` command line will
>> + be placed in socket 3, with core-id 14
>> +
>> +* the core with ID 9 provided by the ``device_add`` qmp command will
>> + be placed in socket 2, with core-id 9
>> +
>> +
>> +Polarization, entitlement and dedication
>> +----------------------------------------
>> +
>> +Polarization
>> +++++++++++++
>> +
>> +The polarization is an indication given by the ``guest`` to the host
>
> Why quoting guest, but not host? I'd remove the quotes from guest here.
OK
>
>> +that it is able to make use of CPU provisioning information.
>> +The guest indicates the polarization by using the PTF instruction.
>> +
>> +Polarization is define two models of CPU provisioning: horizontal
>
> "Polarization defines ..." ? ... or "Polarization is defined by ..." ?
thx
>
>> +and vertical.
>> +
>> +The horizontal polarization is the default model on boot and after
>> +subsystem reset in which the guest considers all vCPUs being having
>
> scratch "being" ?
Thx
>
>> +an equal provisioning of CPUs by the host.
>> +
>> +In the vertical polarization model the guest can make use of the
>> +vCPU entitlement information provided by the host to optimize
>> +kernel thread scheduling.
>> +
>> +A subsystem reset puts all vCPU of the configuration into the
>> +horizontal polarization.
>> +
>> +Entitlement
>> ++++++++++++
>> +
>> +The vertical polarization specifies that the guest's vCPU can get
>> +different real CPU provisions:
>> +
>> +- a vCPU with vertical high entitlement specifies that this
>> + vCPU gets 100% of the real CPU provisioning.
>> +
>> +- a vCPU with vertical medium entitlement specifies that this
>> + vCPU shares the real CPU with other vCPUs.
>> +
>> +- a vCPU with vertical low entitlement specifies that this
>> + vCPU only gets real CPU provisioning when no other vCPUs needs it.
>> +
>> +In the case a vCPU with vertical high entitlement does not use
>> +the real CPU, the unused "slack" can be dispatched to other vCPU
>> +with medium or low entitlement.
>> +
>> +The upper level specifies a vCPU as ``dedicated`` when the vCPU is
>
> Using `` quotes will print "dedicated" in monotyped font ... is that
> what you wanted here? AFAIK we're mainly doing that for things that
> can be typed in the terminal, e.g. command line options. So should
> this use normal quotes instead?
No, I think we do not need quotes here.
Thanks
regards,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests
2023-07-05 10:22 ` Thomas Huth
@ 2023-07-12 19:37 ` Nina Schoetterl-Glausch
2023-07-12 20:11 ` Thomas Huth
0 siblings, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-12 19:37 UTC (permalink / raw)
To: Thomas Huth, Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, frankja, berrange, clg
On Wed, 2023-07-05 at 12:22 +0200, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
> > This test takes care to check the changes on different entitlements
> > when the guest requests a polarization change.
> >
> > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> > ---
> > tests/avocado/s390_topology.py | 47
> > ++++++++++++++++++++++++++++++++++
> > 1 file changed, 47 insertions(+)
> >
> > diff --git a/tests/avocado/s390_topology.py
> > b/tests/avocado/s390_topology.py
> > index 2cf731cb1d..4855e5d7e4 100644
> > --- a/tests/avocado/s390_topology.py
> > +++ b/tests/avocado/s390_topology.py
> > @@ -240,3 +240,50 @@ def test_polarisation(self):
> > res = self.vm.qmp('query-cpu-polarization')
> > self.assertEqual(res['return']['polarization'],
> > 'horizontal')
> > self.check_topology(0, 0, 0, 0, 'medium', False)
> > +
> > + def test_entitlement(self):
> > + """
> > + This test verifies that QEMU modifies the polarization
> > + after a guest request.
> ...
> > + self.check_topology(0, 0, 0, 0, 'low', False)
> > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > + self.check_topology(2, 1, 0, 0, 'high', False)
> > + self.check_topology(3, 1, 0, 0, 'high', False)
> > +
> > + self.guest_set_dispatching('1');
> > +
> > + self.check_topology(0, 0, 0, 0, 'low', False)
> > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > + self.check_topology(2, 1, 0, 0, 'high', False)
> > + self.check_topology(3, 1, 0, 0, 'high', False)
> > +
> > + self.guest_set_dispatching('0');
> > +
> > + self.check_topology(0, 0, 0, 0, 'low', False)
> > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > + self.check_topology(2, 1, 0, 0, 'high', False)
> > + self.check_topology(3, 1, 0, 0, 'high', False)
>
> Sorry, I think I'm too blind to see it, but what has changed after
> the guest
> changed the polarization?
Nothing, the values are retained, they're just not active.
The guest will see a horizontal polarization until it changes back to
vertical.
>
> Thomas
>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 14/20] tests/avocado: s390x cpu topology core
2023-06-30 9:17 ` [PATCH v21 14/20] tests/avocado: s390x cpu topology core Pierre Morel
2023-07-04 13:14 ` Thomas Huth
@ 2023-07-12 20:00 ` Nina Schoetterl-Glausch
2023-07-19 11:05 ` Pierre Morel
1 sibling, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-12 20:00 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> Introduction of the s390x cpu topology core functions and
> basic tests.
>
> We test the corelation between the command line and
corRelation
> the QMP results in query-cpus-fast for various CPU topology.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
> ---
[...]
> diff --git a/tests/avocado/s390_topology.py
> b/tests/avocado/s390_topology.py
> new file mode 100644
> index 0000000000..1758ec1f13
> --- /dev/null
> +++ b/tests/avocado/s390_topology.py
> @@ -0,0 +1,196 @@
[...]
> +class S390CPUTopology(QemuSystemTest):
> + """
> + S390x CPU topology consist of 4 topology layers, from bottom to
consistS
> top,
> + the cores, sockets, books and drawers and 2 modifiers
> attributes,
> + the entitlement and the dedication.
> + See: docs/system/s390x/cpu-topology.rst.
> +
> + S390x CPU topology is setup in different ways:
> + - implicitely from the '-smp' argument by completing each
> topology
> + level one after the other begining with drawer 0, book 0 and
> socket 0.
> + - explicitely from the '-device' argument on the QEMU command
> line
> + - explicitely by hotplug of a new CPU using QMP or HMP
> + - it is modified by using QMP 'set-cpu-topology'
> +
> + The S390x modifier attribute entitlement depends on the machine
> + polarization, which can be horizontal or vertical.
> + The polarization is changed on a request from the guest.
> + """
[...]
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests
2023-07-12 19:37 ` Nina Schoetterl-Glausch
@ 2023-07-12 20:11 ` Thomas Huth
2023-07-14 16:30 ` Nina Schoetterl-Glausch
0 siblings, 1 reply; 78+ messages in thread
From: Thomas Huth @ 2023-07-12 20:11 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, frankja, berrange, clg
On 12/07/2023 21.37, Nina Schoetterl-Glausch wrote:
> On Wed, 2023-07-05 at 12:22 +0200, Thomas Huth wrote:
>> On 30/06/2023 11.17, Pierre Morel wrote:
>>> This test takes care to check the changes on different entitlements
>>> when the guest requests a polarization change.
>>>
>>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>>> ---
>>> tests/avocado/s390_topology.py | 47
>>> ++++++++++++++++++++++++++++++++++
>>> 1 file changed, 47 insertions(+)
>>>
>>> diff --git a/tests/avocado/s390_topology.py
>>> b/tests/avocado/s390_topology.py
>>> index 2cf731cb1d..4855e5d7e4 100644
>>> --- a/tests/avocado/s390_topology.py
>>> +++ b/tests/avocado/s390_topology.py
>>> @@ -240,3 +240,50 @@ def test_polarisation(self):
>>> res = self.vm.qmp('query-cpu-polarization')
>>> self.assertEqual(res['return']['polarization'],
>>> 'horizontal')
>>> self.check_topology(0, 0, 0, 0, 'medium', False)
>>> +
>>> + def test_entitlement(self):
>>> + """
>>> + This test verifies that QEMU modifies the polarization
>>> + after a guest request.
>> ...
>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>> +
>>> + self.guest_set_dispatching('1');
>>> +
>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>> +
>>> + self.guest_set_dispatching('0');
>>> +
>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>
>> Sorry, I think I'm too blind to see it, but what has changed after
>> the guest
>> changed the polarization?
>
> Nothing, the values are retained, they're just not active.
> The guest will see a horizontal polarization until it changes back to
> vertical.
But then the comment in front of it ("This test verifies that QEMU
*modifies* the polarization...") does not quite match, does it?
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB
2023-07-12 14:24 ` Pierre Morel
@ 2023-07-12 20:14 ` Thomas Huth
0 siblings, 0 replies; 78+ messages in thread
From: Thomas Huth @ 2023-07-12 20:14 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x, frankja, Claudio Imbrenda
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, berrange, clg
On 12/07/2023 16.24, Pierre Morel wrote:
>
> On 7/4/23 13:40, Thomas Huth wrote:
>> On 30/06/2023 11.17, Pierre Morel wrote:
>>> On interception of STSI(15.1.x) the System Information Block
>>> (SYSIB) is built from the list of pre-ordered topology entries.
>>>
>>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>>> ---
>> ...
>>> diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
>>> index 7ebd5e05b6..6e7d041b01 100644
>>> --- a/target/s390x/cpu.h
>>> +++ b/target/s390x/cpu.h
>>> @@ -569,6 +569,29 @@ typedef struct SysIB_322 {
>>> } SysIB_322;
>>> QEMU_BUILD_BUG_ON(sizeof(SysIB_322) != 4096);
>>> +/*
>>> + * Topology Magnitude fields (MAG) indicates the maximum number of
>>> + * topology list entries (TLE) at the corresponding nesting level.
>>> + */
>>> +#define S390_TOPOLOGY_MAG 6
>>> +#define S390_TOPOLOGY_MAG6 0
>>> +#define S390_TOPOLOGY_MAG5 1
>>> +#define S390_TOPOLOGY_MAG4 2
>>> +#define S390_TOPOLOGY_MAG3 3
>>> +#define S390_TOPOLOGY_MAG2 4
>>> +#define S390_TOPOLOGY_MAG1 5
>>> +/* Configuration topology */
>>> +typedef struct SysIB_151x {
>>> + uint8_t reserved0[2];
>>> + uint16_t length;
>>> + uint8_t mag[S390_TOPOLOGY_MAG];
>>> + uint8_t reserved1;
>>> + uint8_t mnest;
>>> + uint32_t reserved2;
>>> + char tle[];
>>> +} SysIB_151x;
>>> +QEMU_BUILD_BUG_ON(sizeof(SysIB_151x) != 16);
>>> +
>>> typedef union SysIB {
>>> SysIB_111 sysib_111;
>>> SysIB_121 sysib_121;
>>> @@ -576,9 +599,62 @@ typedef union SysIB {
>>> SysIB_221 sysib_221;
>>> SysIB_222 sysib_222;
>>> SysIB_322 sysib_322;
>>> + SysIB_151x sysib_151x;
>>> } SysIB;
>>> QEMU_BUILD_BUG_ON(sizeof(SysIB) != 4096);
>>> +/*
>>> + * CPU Topology List provided by STSI with fc=15 provides a list
>>> + * of two different Topology List Entries (TLE) types to specify
>>> + * the topology hierarchy.
>>> + *
>>> + * - Container Topology List Entry
>>> + * Defines a container to contain other Topology List Entries
>>> + * of any type, nested containers or CPU.
>>> + * - CPU Topology List Entry
>>> + * Specifies the CPUs position, type, entitlement and polarization
>>> + * of the CPUs contained in the last Container TLE.
>>> + *
>>> + * There can be theoretically up to five levels of containers, QEMU
>>> + * uses only three levels, the drawer's, book's and socket's level.
>>> + *
>>> + * A container with a nesting level (NL) greater than 1 can only
>>> + * contain another container of nesting level NL-1.
>>> + *
>>> + * A container of nesting level 1 (socket), contains as many CPU TLE
>>> + * as needed to describe the position and qualities of all CPUs inside
>>> + * the container.
>>> + * The qualities of a CPU are polarization, entitlement and type.
>>> + *
>>> + * The CPU TLE defines the position of the CPUs of identical qualities
>>> + * using a 64bits mask which first bit has its offset defined by
>>> + * the CPU address orgin field of the CPU TLE like in:
>>> + * CPU address = origin * 64 + bit position within the mask
>>> + *
>>> + */
>>> +/* Container type Topology List Entry */
>>> +typedef struct SysIBTl_container {
>>> + uint8_t nl;
>>> + uint8_t reserved[6];
>>> + uint8_t id;
>>> +} SysIBTl_container;
>>
>> Why mixing CamelCase with underscore-style here? SysIBTlContainer would
>> look more natural, I think?
>
>
> OK, what about SYSIBContainerListEntry ?
Sounds fine!
>
>>
>>> +QEMU_BUILD_BUG_ON(sizeof(SysIBTl_container) != 8);
>>> +
>>> +/* CPU type Topology List Entry */
>>> +typedef struct SysIBTl_cpu {
>>> + uint8_t nl;
>>> + uint8_t reserved0[3];
>>> +#define SYSIB_TLE_POLARITY_MASK 0x03
>>> +#define SYSIB_TLE_DEDICATED 0x04
>>> + uint8_t flags;
>>> + uint8_t type;
>>> + uint16_t origin;
>>> + uint64_t mask;
>>> +} SysIBTl_cpu;
>>
>> dito, maybe better SysIBTlCpu ?
>
>
> What about SysIBCPUListEntry ?
Ack.
Thomas
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests
2023-07-12 20:11 ` Thomas Huth
@ 2023-07-14 16:30 ` Nina Schoetterl-Glausch
2023-07-19 14:08 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-14 16:30 UTC (permalink / raw)
To: Thomas Huth, Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, frankja, berrange, clg
On Wed, 2023-07-12 at 22:11 +0200, Thomas Huth wrote:
> On 12/07/2023 21.37, Nina Schoetterl-Glausch wrote:
> > On Wed, 2023-07-05 at 12:22 +0200, Thomas Huth wrote:
> > > On 30/06/2023 11.17, Pierre Morel wrote:
> > > > This test takes care to check the changes on different
> > > > entitlements
> > > > when the guest requests a polarization change.
> > > >
> > > > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> > > > ---
> > > > tests/avocado/s390_topology.py | 47
> > > > ++++++++++++++++++++++++++++++++++
> > > > 1 file changed, 47 insertions(+)
> > > >
> > > > diff --git a/tests/avocado/s390_topology.py
> > > > b/tests/avocado/s390_topology.py
> > > > index 2cf731cb1d..4855e5d7e4 100644
> > > > --- a/tests/avocado/s390_topology.py
> > > > +++ b/tests/avocado/s390_topology.py
> > > > @@ -240,3 +240,50 @@ def test_polarisation(self):
> > > > res = self.vm.qmp('query-cpu-polarization')
> > > > self.assertEqual(res['return']['polarization'],
> > > > 'horizontal')
> > > > self.check_topology(0, 0, 0, 0, 'medium', False)
> > > > +
> > > > + def test_entitlement(self):
> > > > + """
> > > > + This test verifies that QEMU modifies the polarization
> > > > + after a guest request.
> > > ...
> > > > + self.check_topology(0, 0, 0, 0, 'low', False)
> > > > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > > > + self.check_topology(2, 1, 0, 0, 'high', False)
> > > > + self.check_topology(3, 1, 0, 0, 'high', False)
> > > > +
> > > > + self.guest_set_dispatching('1');
> > > > +
> > > > + self.check_topology(0, 0, 0, 0, 'low', False)
> > > > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > > > + self.check_topology(2, 1, 0, 0, 'high', False)
> > > > + self.check_topology(3, 1, 0, 0, 'high', False)
> > > > +
> > > > + self.guest_set_dispatching('0');
> > > > +
> > > > + self.check_topology(0, 0, 0, 0, 'low', False)
> > > > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > > > + self.check_topology(2, 1, 0, 0, 'high', False)
> > > > + self.check_topology(3, 1, 0, 0, 'high', False)
> > >
> > > Sorry, I think I'm too blind to see it, but what has changed
> > > after
> > > the guest
> > > changed the polarization?
> >
> > Nothing, the values are retained, they're just not active.
> > The guest will see a horizontal polarization until it changes back
> > to
> > vertical.
>
> But then the comment in front of it ("This test verifies that QEMU
> *modifies* the polarization...") does not quite match, does it?
Yeah, it tests that QEMU reports it's own state changed when using
set-cpu-topology.
I think it would be a good idea to get the guests view from the sysfs,
also.
>
> Thomas
>
>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command
2023-06-30 9:17 ` [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command Pierre Morel
2023-07-04 12:53 ` Thomas Huth
@ 2023-07-18 7:54 ` Nina Schoetterl-Glausch
2023-07-18 12:25 ` Pierre Morel
1 sibling, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-18 7:54 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> The modification of the CPU attributes are done through a monitor
> command.
>
> It allows to move the core inside the topology tree to optimize
> the cache usage in the case the host's hypervisor previously
> moved the CPU.
>
> The same command allows to modify the CPU attributes modifiers
> like polarization entitlement and the dedicated attribute to notify
> the guest if the host admin modified scheduling or dedication of a
> vCPU.
>
> With this knowledge the guest has the possibility to optimize the
> usage of the vCPUs.
>
> The command has a feature unstable for the moment.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event
2023-06-30 9:17 ` [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event Pierre Morel
2023-07-04 13:04 ` Thomas Huth
@ 2023-07-18 7:59 ` Nina Schoetterl-Glausch
2023-07-18 12:34 ` Pierre Morel
1 sibling, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-18 7:59 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> When the guest asks to change the polarization this change
> is forwarded to the upper layer using QAPI.
> The upper layer is supposed to take according decisions concerning
> CPU provisioning.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command
2023-07-18 7:54 ` Nina Schoetterl-Glausch
@ 2023-07-18 12:25 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-18 12:25 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On 7/18/23 09:54, Nina Schoetterl-Glausch wrote:
> On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
>> The modification of the CPU attributes are done through a monitor
>> command.
>>
>> It allows to move the core inside the topology tree to optimize
>> the cache usage in the case the host's hypervisor previously
>> moved the CPU.
>>
>> The same command allows to modify the CPU attributes modifiers
>> like polarization entitlement and the dedicated attribute to notify
>> the guest if the host admin modified scheduling or dedication of a
>> vCPU.
>>
>> With this knowledge the guest has the possibility to optimize the
>> usage of the vCPUs.
>>
>> The command has a feature unstable for the moment.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Thanks,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event
2023-07-18 7:59 ` Nina Schoetterl-Glausch
@ 2023-07-18 12:34 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-18 12:34 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On 7/18/23 09:59, Nina Schoetterl-Glausch wrote:
> On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
>> When the guest asks to change the polarization this change
>> is forwarded to the upper layer using QAPI.
>> The upper layer is supposed to take according decisions concerning
>> CPU provisioning.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
>
Thanks,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology
2023-06-30 9:17 ` [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology Pierre Morel
@ 2023-07-18 16:31 ` Nina Schoetterl-Glausch
2023-07-21 11:24 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-18 16:31 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Some notes below.
The s390x/ prefix in the title might suggest that this patch
is s390 specific, but it touches common files.
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> S390 adds two new SMP levels, drawers and books to the CPU
> topology.
> The S390 CPU have specific topology features like dedication
S390 CPUs have specific topology features like dedication and
entitlement. These indicate to the guest information on host
vCPU scheduling and help the guest make better scheduling decisions.
> and entitlement to give to the guest indications on the host
> vCPUs scheduling and help the guest take the best decisions
> on the scheduling of threads on the vCPUs.
>
> Let us provide the SMP properties with books and drawers levels
> and S390 CPU with dedication and entitlement,
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> qapi/machine-common.json | 22 +++++++++++++
> qapi/machine.json | 21 ++++++++++---
> include/hw/boards.h | 10 +++++-
> include/hw/qdev-properties-system.h | 4 +++
> target/s390x/cpu.h | 6 ++++
> hw/core/machine-smp.c | 48 ++++++++++++++++++++++++---
> --
> hw/core/machine.c | 4 +++
> hw/core/qdev-properties-system.c | 13 ++++++++
> hw/s390x/s390-virtio-ccw.c | 2 ++
> softmmu/vl.c | 6 ++++
> target/s390x/cpu.c | 7 +++++
> qapi/meson.build | 1 +
> qemu-options.hx | 7 +++--
> 13 files changed, 137 insertions(+), 14 deletions(-)
> create mode 100644 qapi/machine-common.json
>
> diff --git a/qapi/machine-common.json b/qapi/machine-common.json
> new file mode 100644
> index 0000000000..bc0d76829c
> --- /dev/null
> +++ b/qapi/machine-common.json
> @@ -0,0 +1,22 @@
> +# -*- Mode: Python -*-
> +# vim: filetype=python
> +#
> +# This work is licensed under the terms of the GNU GPL, version 2 or
> later.
> +# See the COPYING file in the top-level directory.
> +
> +##
> +# = Machines S390 data types
Common definitions for machine.json and machine-target.json
[...]
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 14/20] tests/avocado: s390x cpu topology core
2023-07-04 13:14 ` Thomas Huth
@ 2023-07-19 9:24 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 9:24 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/4/23 15:14, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> Introduction of the s390x cpu topology core functions and
>> basic tests.
>>
>> We test the corelation between the command line and
>> the QMP results in query-cpus-fast for various CPU topology.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> MAINTAINERS | 1 +
>> tests/avocado/s390_topology.py | 196 +++++++++++++++++++++++++++++++++
>> 2 files changed, 197 insertions(+)
>> create mode 100644 tests/avocado/s390_topology.py
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 76f236564c..12d0d7bd91 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -1705,6 +1705,7 @@ F: hw/s390x/cpu-topology.c
>> F: target/s390x/kvm/stsi-topology.c
>> F: docs/devel/s390-cpu-topology.rst
>> F: docs/system/s390x/cpu-topology.rst
>> +F: tests/avocado/s390_topology.py
>> X86 Machines
>> ------------
>> diff --git a/tests/avocado/s390_topology.py
>> b/tests/avocado/s390_topology.py
>> new file mode 100644
>> index 0000000000..1758ec1f13
>> --- /dev/null
>> +++ b/tests/avocado/s390_topology.py
>> @@ -0,0 +1,196 @@
>> +# Functional test that boots a Linux kernel and checks the console
>> +#
>> +# Copyright IBM Corp. 2023
>> +#
>> +# Author:
>> +# Pierre Morel <pmorel@linux.ibm.com>
>> +#
>> +# This work is licensed under the terms of the GNU GPL, version 2 or
>> +# later. See the COPYING file in the top-level directory.
>> +
>> +import os
>> +import shutil
>> +import time
>> +
>> +from avocado_qemu import QemuSystemTest
>> +from avocado_qemu import exec_command
>> +from avocado_qemu import exec_command_and_wait_for_pattern
>> +from avocado_qemu import interrupt_interactive_console_until_pattern
>> +from avocado_qemu import wait_for_console_pattern
>> +from avocado.utils import process
>> +from avocado.utils import archive
>> +
>> +
>> +class S390CPUTopology(QemuSystemTest):
>> + """
>> + S390x CPU topology consist of 4 topology layers, from bottom to
>> top,
>> + the cores, sockets, books and drawers and 2 modifiers attributes,
>> + the entitlement and the dedication.
>> + See: docs/system/s390x/cpu-topology.rst.
>> +
>> + S390x CPU topology is setup in different ways:
>> + - implicitely from the '-smp' argument by completing each topology
>
> implicitly
>
>> + level one after the other begining with drawer 0, book 0 and
>> socket 0.
>
> beginning
>
>> + - explicitely from the '-device' argument on the QEMU command line
>
> explicitly
>
>> + - explicitely by hotplug of a new CPU using QMP or HMP
>
> explicitly
>
> Thomas
>
Thanks, I make the corrections.
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 14/20] tests/avocado: s390x cpu topology core
2023-07-12 20:00 ` Nina Schoetterl-Glausch
@ 2023-07-19 11:05 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 11:05 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On 7/12/23 22:00, Nina Schoetterl-Glausch wrote:
> On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
>> Introduction of the s390x cpu topology core functions and
>> basic tests.
>>
>> We test the corelation between the command line and
> corRelation
>
>> the QMP results in query-cpus-fast for various CPU topology.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Thanks,
I did change the two spelling errors.
regards,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 15/20] tests/avocado: s390x cpu topology polarisation
2023-07-05 8:53 ` Thomas Huth
@ 2023-07-19 11:35 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 11:35 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/5/23 10:53, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> Polarization is changed on a request from the guest.
>> Let's verify the polarization is accordingly set by QEMU.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> tests/avocado/s390_topology.py | 46 ++++++++++++++++++++++++++++++++++
>> 1 file changed, 46 insertions(+)
>>
>> diff --git a/tests/avocado/s390_topology.py
>> b/tests/avocado/s390_topology.py
>> index 1758ec1f13..2cf731cb1d 100644
>> --- a/tests/avocado/s390_topology.py
>> +++ b/tests/avocado/s390_topology.py
>> @@ -40,6 +40,7 @@ class S390CPUTopology(QemuSystemTest):
>> The polarization is changed on a request from the guest.
>> """
>> timeout = 90
>> + event_timeout = 1
>
> When running tests in CI and the machines are very loaded, the tests
> can be stalled easily by multiple seconds. So using a timeout of 1
> seconds sounds way too low for me. Please use at least 5 seconds, or
> maybe even 10.
OK
>
>> KERNEL_COMMON_COMMAND_LINE = ('printk.time=0 '
>> 'root=/dev/ram '
>> @@ -99,6 +100,15 @@ def kernel_init(self):
>> '-initrd', initrd_path,
>> '-append', kernel_command_line)
>> + def system_init(self):
>> + self.log.info("System init")
>> + exec_command(self, 'mount proc -t proc /proc')
>> + time.sleep(0.2)
>> + exec_command(self, 'mount sys -t sysfs /sys')
>> + time.sleep(0.2)
>
> Hard coded sleeps are ugly... they are prone to race conditions (e.g.
> on loaded test systems), and they artificially slow down the test
> duration.
>
> What about doing all three commands in one statement instead:
>
> exec_command_and_wait_for_pattern(self,
> """mount proc -t proc /proc ;
> mount sys -t sysfs /sys ;
> /bin/cat /sys/devices/system/cpu/dispatching""",
> '0')
>
> ?
>
OK , I use this. thx.
Regards,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests
2023-07-14 16:30 ` Nina Schoetterl-Glausch
@ 2023-07-19 14:08 ` Pierre Morel
2023-07-19 14:13 ` Nina Schoetterl-Glausch
0 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 14:08 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, frankja, berrange, clg
On 7/14/23 18:30, Nina Schoetterl-Glausch wrote:
> On Wed, 2023-07-12 at 22:11 +0200, Thomas Huth wrote:
>> On 12/07/2023 21.37, Nina Schoetterl-Glausch wrote:
>>> On Wed, 2023-07-05 at 12:22 +0200, Thomas Huth wrote:
>>>> On 30/06/2023 11.17, Pierre Morel wrote:
>>>>> This test takes care to check the changes on different
>>>>> entitlements
>>>>> when the guest requests a polarization change.
>>>>>
>>>>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>>>>> ---
>>>>> tests/avocado/s390_topology.py | 47
>>>>> ++++++++++++++++++++++++++++++++++
>>>>> 1 file changed, 47 insertions(+)
>>>>>
>>>>> diff --git a/tests/avocado/s390_topology.py
>>>>> b/tests/avocado/s390_topology.py
>>>>> index 2cf731cb1d..4855e5d7e4 100644
>>>>> --- a/tests/avocado/s390_topology.py
>>>>> +++ b/tests/avocado/s390_topology.py
>>>>> @@ -240,3 +240,50 @@ def test_polarisation(self):
>>>>> res = self.vm.qmp('query-cpu-polarization')
>>>>> self.assertEqual(res['return']['polarization'],
>>>>> 'horizontal')
>>>>> self.check_topology(0, 0, 0, 0, 'medium', False)
>>>>> +
>>>>> + def test_entitlement(self):
>>>>> + """
>>>>> + This test verifies that QEMU modifies the polarization
>>>>> + after a guest request.
>>>> ...
>>>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>>>> +
>>>>> + self.guest_set_dispatching('1');
>>>>> +
>>>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>>>> +
>>>>> + self.guest_set_dispatching('0');
>>>>> +
>>>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>>> Sorry, I think I'm too blind to see it, but what has changed
>>>> after
>>>> the guest
>>>> changed the polarization?
>>> Nothing, the values are retained, they're just not active.
>>> The guest will see a horizontal polarization until it changes back
>>> to
>>> vertical.
>> But then the comment in front of it ("This test verifies that QEMU
>> *modifies* the polarization...") does not quite match, does it?
> Yeah, it tests that QEMU reports it's own state changed when using
> set-cpu-topology.
> I think it would be a good idea to get the guests view from the sysfs,
> also.
>
>> Thomas
>>
>>
Yes, I think you are right, I rewrite this to check the guest view of
the changes.
As you said the values are retained when not used by horizontal
polarization so it is a non sense to check from host view.
Thanks
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 17/20] tests/avocado: s390x cpu topology test dedicated CPU
2023-06-30 9:17 ` [PATCH v21 17/20] tests/avocado: s390x cpu topology test dedicated CPU Pierre Morel
@ 2023-07-19 14:09 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 14:09 UTC (permalink / raw)
To: qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, nsg, frankja, berrange, clg
Same as for the previous test.
I rewrite this to check the guest view.
On 6/30/23 11:17, Pierre Morel wrote:
> A dedicated CPU in vertical polarization can only have
> a high entitlement.
> Let's check this.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> tests/avocado/s390_topology.py | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/tests/avocado/s390_topology.py b/tests/avocado/s390_topology.py
> index 4855e5d7e4..cba44bec91 100644
> --- a/tests/avocado/s390_topology.py
> +++ b/tests/avocado/s390_topology.py
> @@ -287,3 +287,31 @@ def test_entitlement(self):
> self.check_topology(1, 0, 0, 0, 'medium', False)
> self.check_topology(2, 1, 0, 0, 'high', False)
> self.check_topology(3, 1, 0, 0, 'high', False)
> +
> + def test_dedicated(self):
> + """
> + This test verifies that QEMU modifies the entitlement change correctly
> + for a dedicated CPU after several guest polarization change requests.
> +
> + :avocado: tags=arch:s390x
> + :avocado: tags=machine:s390-ccw-virtio
> + """
> + self.kernel_init()
> + self.vm.launch()
> + self.wait_until_booted()
> +
> + self.system_init()
> +
> + res = self.vm.qmp('set-cpu-topology',
> + {'core-id': 0, 'dedicated': True})
> + self.assertEqual(res['return'], {})
> +
> + self.check_topology(0, 0, 0, 0, 'high', True)
> +
> + self.guest_set_dispatching('1');
> +
> + self.check_topology(0, 0, 0, 0, 'high', True)
> +
> + self.guest_set_dispatching('0');
> +
> + self.check_topology(0, 0, 0, 0, 'high', True)
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests
2023-07-19 14:08 ` Pierre Morel
@ 2023-07-19 14:13 ` Nina Schoetterl-Glausch
2023-07-19 15:34 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-19 14:13 UTC (permalink / raw)
To: Pierre Morel, Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, frankja, berrange, clg
On Wed, 2023-07-19 at 16:08 +0200, Pierre Morel wrote:
>
> On 7/14/23 18:30, Nina Schoetterl-Glausch wrote:
> > On Wed, 2023-07-12 at 22:11 +0200, Thomas Huth wrote:
> > > On 12/07/2023 21.37, Nina Schoetterl-Glausch wrote:
> > > > On Wed, 2023-07-05 at 12:22 +0200, Thomas Huth wrote:
> > > > > On 30/06/2023 11.17, Pierre Morel wrote:
> > > > > > This test takes care to check the changes on different
> > > > > > entitlements
> > > > > > when the guest requests a polarization change.
> > > > > >
> > > > > > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> > > > > > ---
> > > > > > tests/avocado/s390_topology.py | 47
> > > > > > ++++++++++++++++++++++++++++++++++
> > > > > > 1 file changed, 47 insertions(+)
> > > > > >
> > > > > > diff --git a/tests/avocado/s390_topology.py
> > > > > > b/tests/avocado/s390_topology.py
> > > > > > index 2cf731cb1d..4855e5d7e4 100644
> > > > > > --- a/tests/avocado/s390_topology.py
> > > > > > +++ b/tests/avocado/s390_topology.py
> > > > > > @@ -240,3 +240,50 @@ def test_polarisation(self):
> > > > > > res = self.vm.qmp('query-cpu-polarization')
> > > > > > self.assertEqual(res['return']['polarization'],
> > > > > > 'horizontal')
> > > > > > self.check_topology(0, 0, 0, 0, 'medium',
> > > > > > False)
> > > > > > +
> > > > > > + def test_entitlement(self):
> > > > > > + """
> > > > > > + This test verifies that QEMU modifies the
> > > > > > polarization
> > > > > > + after a guest request.
> > > > > ...
> > > > > > + self.check_topology(0, 0, 0, 0, 'low', False)
> > > > > > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > > > > > + self.check_topology(2, 1, 0, 0, 'high', False)
> > > > > > + self.check_topology(3, 1, 0, 0, 'high', False)
> > > > > > +
> > > > > > + self.guest_set_dispatching('1');
> > > > > > +
> > > > > > + self.check_topology(0, 0, 0, 0, 'low', False)
> > > > > > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > > > > > + self.check_topology(2, 1, 0, 0, 'high', False)
> > > > > > + self.check_topology(3, 1, 0, 0, 'high', False)
> > > > > > +
> > > > > > + self.guest_set_dispatching('0');
> > > > > > +
> > > > > > + self.check_topology(0, 0, 0, 0, 'low', False)
> > > > > > + self.check_topology(1, 0, 0, 0, 'medium', False)
> > > > > > + self.check_topology(2, 1, 0, 0, 'high', False)
> > > > > > + self.check_topology(3, 1, 0, 0, 'high', False)
> > > > > Sorry, I think I'm too blind to see it, but what has changed
> > > > > after
> > > > > the guest
> > > > > changed the polarization?
> > > > Nothing, the values are retained, they're just not active.
> > > > The guest will see a horizontal polarization until it changes
> > > > back
> > > > to
> > > > vertical.
> > > But then the comment in front of it ("This test verifies that
> > > QEMU
> > > *modifies* the polarization...") does not quite match, does it?
> > Yeah, it tests that QEMU reports it's own state changed when using
> > set-cpu-topology.
> > I think it would be a good idea to get the guests view from the
> > sysfs,
> > also.
> >
> > > Thomas
> > >
> > >
>
> Yes, I think you are right, I rewrite this to check the guest view of
> the changes.
>
> As you said the values are retained when not used by horizontal
> polarization so it is a non sense to check from host view.
I don't think it's bad to check the host view, you can do both.
>
> Thanks
>
> Pierre
>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 18/20] tests/avocado: s390x cpu topology test socket full
2023-07-05 10:26 ` Thomas Huth
@ 2023-07-19 14:21 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 14:21 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/5/23 12:26, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> This test verifies that QMP set-cpu-topology does not accept
>> to overload a socket.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> tests/avocado/s390_topology.py | 25 +++++++++++++++++++++++++
>> 1 file changed, 25 insertions(+)
>>
>> diff --git a/tests/avocado/s390_topology.py
>> b/tests/avocado/s390_topology.py
>> index cba44bec91..0003b30702 100644
>> --- a/tests/avocado/s390_topology.py
>> +++ b/tests/avocado/s390_topology.py
>> @@ -315,3 +315,28 @@ def test_dedicated(self):
>> self.guest_set_dispatching('0');
>> self.check_topology(0, 0, 0, 0, 'high', True)
>> +
>> + def test_socket_full(self):
>> + """
>> + This test verifies that QEMU does not accept to overload a
>> socket.
>> + The socket-id 0 on book-id 0 already contains CPUs 0 and 1
>> and can
>> + not accept any new CPU while socket-id 0 on book-id 1 is free.
>> +
>> + :avocado: tags=arch:s390x
>> + :avocado: tags=machine:s390-ccw-virtio
>> + """
>> + self.kernel_init()
>> + self.vm.add_args('-smp',
>> + '3,drawers=2,books=2,sockets=3,cores=2,maxcpus=24')
>> + self.vm.launch()
>> + self.wait_until_booted()
>> +
>> + self.system_init()
>> +
>> + res = self.vm.qmp('set-cpu-topology',
>> + {'core-id': 2, 'socket-id': 0, 'book-id': 0})
>> + self.assertEqual(res['error']['class'], 'GenericError')
>> +
>> + res = self.vm.qmp('set-cpu-topology',
>> + {'core-id': 2, 'socket-id': 0, 'book-id': 1})
>> + self.assertEqual(res['return'], {})
>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
>
Thanks,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 19/20] tests/avocado: s390x cpu topology dedicated errors
2023-07-05 10:28 ` Thomas Huth
@ 2023-07-19 14:21 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 14:21 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/5/23 12:28, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> Let's test that QEMU refuses to setup a dedicated CPU with
>> low or medium entitlement.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> tests/avocado/s390_topology.py | 48 ++++++++++++++++++++++++++++++++++
>> 1 file changed, 48 insertions(+)
>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
>
Thanks,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 20/20] tests/avocado: s390x cpu topology bad move
2023-07-05 10:32 ` Thomas Huth
@ 2023-07-19 14:23 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 14:23 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/5/23 12:32, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
>> This test verifies that QEMU refuses to move a CPU to an
>> unexistant location.
>
> s/unexistant/nonexistent/ ?
>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> tests/avocado/s390_topology.py | 25 +++++++++++++++++++++++++
>> 1 file changed, 25 insertions(+)
>>
>> diff --git a/tests/avocado/s390_topology.py
>> b/tests/avocado/s390_topology.py
>> index 99d9508cef..ea39168b53 100644
>> --- a/tests/avocado/s390_topology.py
>> +++ b/tests/avocado/s390_topology.py
>> @@ -388,3 +388,28 @@ def test_dedicated_error(self):
>> res = self.vm.qmp('set-cpu-topology',
>> {'core-id': 0, 'entitlement': 'medium',
>> 'dedicated': False})
>> self.assertEqual(res['return'], {})
>> +
>> + def test_move_error(self):
>> + """
>> + This test verifies that QEMU refuses to move a CPU to an
>> + unexistant location
>
> s/unexistant/nonexistent/ ?
>
> With the words fixed:
> Reviewed-by: Thomas Huth <thuth@redhat.com>
>
I fix it, thanks,
Regards,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 00/20] s390x: CPU Topology
2023-07-05 10:02 ` [PATCH v21 00/20] s390x: CPU Topology Thomas Huth
@ 2023-07-19 15:27 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 15:27 UTC (permalink / raw)
To: Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, nsg, frankja, berrange, clg
On 7/5/23 12:02, Thomas Huth wrote:
> On 30/06/2023 11.17, Pierre Morel wrote:
> ...
>> Testing
>> =======
>>
>> To use the QEMU patches, you will need Linux V6-rc1 or newer,
>> or use the following Linux mainline patches:
>>
>> f5ecfee94493 2022-07-20 KVM: s390: resetting the Topology-Change-Report
>> 24fe0195bc19 2022-07-20 KVM: s390: guest support for topology function
>> 0130337ec45b 2022-07-20 KVM: s390: Cleanup ipte lock access and SIIF
>> fac..
>>
>> Currently this code is for KVM only, I have no idea if it is interesting
>> to provide a TCG patch. If ever it will be done in another series.
>>
>> This series provide 12 avocado tests using Fedora-35 kernel and initrd
>> image.
>
> Hi Pierre,
>
> the new avocado tests currently fail if you run them on a x86 host.
> Could you please add a check that they are properly skipped instead if
> the environment does not match? I guess a
>
> self.require_accelerator('kvm')
>
> should do the job...
>
> Thomas
>
Yes, thanks, I add this during initialization of the VM.
Regards,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests
2023-07-19 14:13 ` Nina Schoetterl-Glausch
@ 2023-07-19 15:34 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-19 15:34 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, Thomas Huth, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, cohuck,
mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake, armbru,
seiden, nrb, frankja, berrange, clg
On 7/19/23 16:13, Nina Schoetterl-Glausch wrote:
> On Wed, 2023-07-19 at 16:08 +0200, Pierre Morel wrote:
>> On 7/14/23 18:30, Nina Schoetterl-Glausch wrote:
>>> On Wed, 2023-07-12 at 22:11 +0200, Thomas Huth wrote:
>>>> On 12/07/2023 21.37, Nina Schoetterl-Glausch wrote:
>>>>> On Wed, 2023-07-05 at 12:22 +0200, Thomas Huth wrote:
>>>>>> On 30/06/2023 11.17, Pierre Morel wrote:
>>>>>>> This test takes care to check the changes on different
>>>>>>> entitlements
>>>>>>> when the guest requests a polarization change.
>>>>>>>
>>>>>>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>>>>>>> ---
>>>>>>> tests/avocado/s390_topology.py | 47
>>>>>>> ++++++++++++++++++++++++++++++++++
>>>>>>> 1 file changed, 47 insertions(+)
>>>>>>>
>>>>>>> diff --git a/tests/avocado/s390_topology.py
>>>>>>> b/tests/avocado/s390_topology.py
>>>>>>> index 2cf731cb1d..4855e5d7e4 100644
>>>>>>> --- a/tests/avocado/s390_topology.py
>>>>>>> +++ b/tests/avocado/s390_topology.py
>>>>>>> @@ -240,3 +240,50 @@ def test_polarisation(self):
>>>>>>> res = self.vm.qmp('query-cpu-polarization')
>>>>>>> self.assertEqual(res['return']['polarization'],
>>>>>>> 'horizontal')
>>>>>>> self.check_topology(0, 0, 0, 0, 'medium',
>>>>>>> False)
>>>>>>> +
>>>>>>> + def test_entitlement(self):
>>>>>>> + """
>>>>>>> + This test verifies that QEMU modifies the
>>>>>>> polarization
>>>>>>> + after a guest request.
>>>>>> ...
>>>>>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>>>>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>>>>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>>>>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>>>>>> +
>>>>>>> + self.guest_set_dispatching('1');
>>>>>>> +
>>>>>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>>>>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>>>>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>>>>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>>>>>> +
>>>>>>> + self.guest_set_dispatching('0');
>>>>>>> +
>>>>>>> + self.check_topology(0, 0, 0, 0, 'low', False)
>>>>>>> + self.check_topology(1, 0, 0, 0, 'medium', False)
>>>>>>> + self.check_topology(2, 1, 0, 0, 'high', False)
>>>>>>> + self.check_topology(3, 1, 0, 0, 'high', False)
>>>>>> Sorry, I think I'm too blind to see it, but what has changed
>>>>>> after
>>>>>> the guest
>>>>>> changed the polarization?
>>>>> Nothing, the values are retained, they're just not active.
>>>>> The guest will see a horizontal polarization until it changes
>>>>> back
>>>>> to
>>>>> vertical.
>>>> But then the comment in front of it ("This test verifies that
>>>> QEMU
>>>> *modifies* the polarization...") does not quite match, does it?
>>> Yeah, it tests that QEMU reports it's own state changed when using
>>> set-cpu-topology.
>>> I think it would be a good idea to get the guests view from the
>>> sysfs,
>>> also.
>>>
>>>> Thomas
>>>>
>>>>
>> Yes, I think you are right, I rewrite this to check the guest view of
>> the changes.
>>
>> As you said the values are retained when not used by horizontal
>> polarization so it is a non sense to check from host view.
> I don't think it's bad to check the host view, you can do both.
>
OK, then I do it.
Thanks,
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology
2023-07-18 16:31 ` Nina Schoetterl-Glausch
@ 2023-07-21 11:24 ` Pierre Morel
2023-07-24 10:15 ` Nina Schoetterl-Glausch
0 siblings, 1 reply; 78+ messages in thread
From: Pierre Morel @ 2023-07-21 11:24 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On 7/18/23 18:31, Nina Schoetterl-Glausch wrote:
> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
>
> Some notes below.
>
> The s390x/ prefix in the title might suggest that this patch
> is s390 specific, but it touches common files.
Right.
What do you suggest?
I can cut it in two or squash it with patch number 2.
The first idea was to separate the patch to ease the review but the
functionality introduced in patch 1 do only make sense with patch 2.
So I would be for squashing the first two patches.
?
>
> On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
>> S390 adds two new SMP levels, drawers and books to the CPU
>> topology.
>> The S390 CPU have specific topology features like dedication
> S390 CPUs have specific topology features like dedication and
> entitlement. These indicate to the guest information on host
> vCPU scheduling and help the guest make better scheduling decisions.
>
>> and entitlement to give to the guest indications on the host
>> vCPUs scheduling and help the guest take the best decisions
>> on the scheduling of threads on the vCPUs.
>>
>> Let us provide the SMP properties with books and drawers levels
>> and S390 CPU with dedication and entitlement,
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> qapi/machine-common.json | 22 +++++++++++++
>> qapi/machine.json | 21 ++++++++++---
>> include/hw/boards.h | 10 +++++-
>> include/hw/qdev-properties-system.h | 4 +++
>> target/s390x/cpu.h | 6 ++++
>> hw/core/machine-smp.c | 48 ++++++++++++++++++++++++---
>> --
>> hw/core/machine.c | 4 +++
>> hw/core/qdev-properties-system.c | 13 ++++++++
>> hw/s390x/s390-virtio-ccw.c | 2 ++
>> softmmu/vl.c | 6 ++++
>> target/s390x/cpu.c | 7 +++++
>> qapi/meson.build | 1 +
>> qemu-options.hx | 7 +++--
>> 13 files changed, 137 insertions(+), 14 deletions(-)
>> create mode 100644 qapi/machine-common.json
>>
>> diff --git a/qapi/machine-common.json b/qapi/machine-common.json
>> new file mode 100644
>> index 0000000000..bc0d76829c
>> --- /dev/null
>> +++ b/qapi/machine-common.json
>> @@ -0,0 +1,22 @@
>> +# -*- Mode: Python -*-
>> +# vim: filetype=python
>> +#
>> +# This work is licensed under the terms of the GNU GPL, version 2 or
>> later.
>> +# See the COPYING file in the top-level directory.
>> +
>> +##
>> +# = Machines S390 data types
> Common definitions for machine.json and machine-target.json
>
>
> [...]
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology
2023-07-21 11:24 ` Pierre Morel
@ 2023-07-24 10:15 ` Nina Schoetterl-Glausch
2023-07-25 8:43 ` Pierre Morel
0 siblings, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-24 10:15 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-07-21 at 13:24 +0200, Pierre Morel wrote:
>
> On 7/18/23 18:31, Nina Schoetterl-Glausch wrote:
> > Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
> >
> > Some notes below.
> >
> > The s390x/ prefix in the title might suggest that this patch
> > is s390 specific, but it touches common files.
>
>
> Right.
>
> What do you suggest?
>
> I can cut it in two or squash it with patch number 2.
>
> The first idea was to separate the patch to ease the review but the
> functionality introduced in patch 1 do only make sense with patch 2.
>
> So I would be for squashing the first two patches.
>
> ?
Oh, I'd just change the title.
CPU topology: extend with s390 specifics
or similar, it was just a nit not to create the impression that the
patch only touches s390 stuff.
>
>
> >
> > On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> > > S390 adds two new SMP levels, drawers and books to the CPU
> > > topology.
> > > The S390 CPU have specific topology features like dedication
> > S390 CPUs have specific topology features like dedication and
> > entitlement. These indicate to the guest information on host
> > vCPU scheduling and help the guest make better scheduling
> > decisions.
> >
> > > and entitlement to give to the guest indications on the host
> > > vCPUs scheduling and help the guest take the best decisions
> > > on the scheduling of threads on the vCPUs.
> > >
> > > Let us provide the SMP properties with books and drawers levels
> > > and S390 CPU with dedication and entitlement,
> > >
> > > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> > > ---
> > > qapi/machine-common.json | 22 +++++++++++++
> > > qapi/machine.json | 21 ++++++++++---
> > > include/hw/boards.h | 10 +++++-
> > > include/hw/qdev-properties-system.h | 4 +++
> > > target/s390x/cpu.h | 6 ++++
> > > hw/core/machine-smp.c | 48
> > > ++++++++++++++++++++++++---
> > > --
> > > hw/core/machine.c | 4 +++
> > > hw/core/qdev-properties-system.c | 13 ++++++++
> > > hw/s390x/s390-virtio-ccw.c | 2 ++
> > > softmmu/vl.c | 6 ++++
> > > target/s390x/cpu.c | 7 +++++
> > > qapi/meson.build | 1 +
> > > qemu-options.hx | 7 +++--
> > > 13 files changed, 137 insertions(+), 14 deletions(-)
> > > create mode 100644 qapi/machine-common.json
> > >
> > > diff --git a/qapi/machine-common.json b/qapi/machine-common.json
> > > new file mode 100644
> > > index 0000000000..bc0d76829c
> > > --- /dev/null
> > > +++ b/qapi/machine-common.json
> > > @@ -0,0 +1,22 @@
> > > +# -*- Mode: Python -*-
> > > +# vim: filetype=python
> > > +#
> > > +# This work is licensed under the terms of the GNU GPL, version
> > > 2 or
> > > later.
> > > +# See the COPYING file in the top-level directory.
> > > +
> > > +##
> > > +# = Machines S390 data types
> > Common definitions for machine.json and machine-target.json
> >
> >
> > [...]
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug
2023-06-30 9:17 ` [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug Pierre Morel
2023-07-04 10:32 ` Thomas Huth
@ 2023-07-24 20:19 ` Nina Schoetterl-Glausch
2023-07-25 8:44 ` Pierre Morel
1 sibling, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-24 20:19 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> The topology information are attributes of the CPU and are
> specified during the CPU device creation.
>
> On hot plug we:
> - calculate the default values for the topology for drawers,
> books and sockets in the case they are not specified.
> - verify the CPU attributes
> - check that we have still room on the desired socket
>
> The possibility to insert a CPU in a mask is dependent on the
> number of cores allowed in a socket, a book or a drawer, the
> checking is done during the hot plug of the CPU to have an
> immediate answer.
>
> If the complete topology is not specified, the core is added
> in the physical topology based on its core ID and it gets
> defaults values for the modifier attributes.
>
> This way, starting QEMU without specifying the topology can
> still get some advantage of the CPU topology.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> if you address
Thomas' comments.
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology
2023-07-24 10:15 ` Nina Schoetterl-Glausch
@ 2023-07-25 8:43 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-25 8:43 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On 7/24/23 12:15, Nina Schoetterl-Glausch wrote:
> On Fri, 2023-07-21 at 13:24 +0200, Pierre Morel wrote:
>> On 7/18/23 18:31, Nina Schoetterl-Glausch wrote:
>>> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
>>>
>>> Some notes below.
>>>
>>> The s390x/ prefix in the title might suggest that this patch
>>> is s390 specific, but it touches common files.
>>
>> Right.
>>
>> What do you suggest?
>>
>> I can cut it in two or squash it with patch number 2.
>>
>> The first idea was to separate the patch to ease the review but the
>> functionality introduced in patch 1 do only make sense with patch 2.
>>
>> So I would be for squashing the first two patches.
>>
>> ?
> Oh, I'd just change the title.
>
> CPU topology: extend with s390 specifics
>
> or similar, it was just a nit not to create the impression that the
> patch only touches s390 stuff.
OK thanks
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug
2023-07-24 20:19 ` Nina Schoetterl-Glausch
@ 2023-07-25 8:44 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-25 8:44 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On 7/24/23 22:19, Nina Schoetterl-Glausch wrote:
> On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
>> The topology information are attributes of the CPU and are
>> specified during the CPU device creation.
>>
>> On hot plug we:
>> - calculate the default values for the topology for drawers,
>> books and sockets in the case they are not specified.
>> - verify the CPU attributes
>> - check that we have still room on the desired socket
>>
>> The possibility to insert a CPU in a mask is dependent on the
>> number of cores allowed in a socket, a book or a drawer, the
>> checking is done during the hot plug of the CPU to have an
>> immediate answer.
>>
>> If the complete topology is not specified, the core is added
>> in the physical topology based on its core ID and it gets
>> defaults values for the modifier attributes.
>>
>> This way, starting QEMU without specifying the topology can
>> still get some advantage of the CPU topology.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> if you address
> Thomas' comments.
>
Thanks,
regards
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 05/20] s390x/cpu topology: resetting the Topology-Change-Report
2023-06-30 9:17 ` [PATCH v21 05/20] s390x/cpu topology: resetting the Topology-Change-Report Pierre Morel
@ 2023-07-25 13:43 ` Nina Schoetterl-Glausch
0 siblings, 0 replies; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-25 13:43 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> During a subsystem reset the Topology-Change-Report is cleared
> by the machine.
> Let's ask KVM to clear the Modified Topology Change Report (MTCR)
> bit of the SCA in the case of a subsystem reset.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB
2023-06-30 9:17 ` [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB Pierre Morel
2023-07-04 11:40 ` Thomas Huth
@ 2023-07-25 15:41 ` Nina Schoetterl-Glausch
2023-07-26 8:11 ` Pierre Morel
2023-07-27 17:31 ` Nina Schoetterl-Glausch
2 siblings, 1 reply; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-25 15:41 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> On interception of STSI(15.1.x) the System Information Block
> (SYSIB) is built from the list of pre-ordered topology entries.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> MAINTAINERS | 1 +
> qapi/machine-target.json | 14 ++
> include/hw/s390x/cpu-topology.h | 25 +++
> include/hw/s390x/sclp.h | 1 +
> target/s390x/cpu.h | 76 ++++++++
> hw/s390x/cpu-topology.c | 4 +-
> target/s390x/kvm/kvm.c | 5 +-
> target/s390x/kvm/stsi-topology.c | 310 +++++++++++++++++++++++++++++++
> target/s390x/kvm/meson.build | 3 +-
> 9 files changed, 436 insertions(+), 3 deletions(-)
> create mode 100644 target/s390x/kvm/stsi-topology.c
[...]
> typedef struct S390Topology {
> uint8_t *cores_per_socket;
> + bool polarization;
You don't use this as a bool and since it's no longer called
vertical_polarization, it's not longer entirely clear what the value
means so I think this should be a CpuS390Polarization.
That also makes the assignment in patch 12 clearer since it assigns the
same type.
[...]
> S390Topology s390_topology = {
> /* will be initialized after the cpu model is realized */
> .cores_per_socket = NULL,
> + .polarization = S390_CPU_POLARIZATION_HORIZONTAL,
> };
[...]
> +static s390_topology_id s390_topology_from_cpu(S390CPU *cpu)
> +{
> + s390_topology_id topology_id = {0};
> +
> + topology_id.drawer = cpu->env.drawer_id;
> + topology_id.book = cpu->env.book_id;
> + topology_id.socket = cpu->env.socket_id;
> + topology_id.origin = cpu->env.core_id / 64;
> + topology_id.type = S390_TOPOLOGY_CPU_IFL;
> + topology_id.dedicated = cpu->env.dedicated;
> +
> + if (s390_topology.polarization == S390_CPU_POLARIZATION_VERTICAL) {
> + topology_id.entitlement = cpu->env.entitlement;
> + }
> +
> + return topology_id;
> +}
[...]
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB
2023-07-25 15:41 ` Nina Schoetterl-Glausch
@ 2023-07-26 8:11 ` Pierre Morel
0 siblings, 0 replies; 78+ messages in thread
From: Pierre Morel @ 2023-07-26 8:11 UTC (permalink / raw)
To: Nina Schoetterl-Glausch, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On 7/25/23 17:41, Nina Schoetterl-Glausch wrote:
> On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
>> On interception of STSI(15.1.x) the System Information Block
>> (SYSIB) is built from the list of pre-ordered topology entries.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>> MAINTAINERS | 1 +
>> qapi/machine-target.json | 14 ++
>> include/hw/s390x/cpu-topology.h | 25 +++
>> include/hw/s390x/sclp.h | 1 +
>> target/s390x/cpu.h | 76 ++++++++
>> hw/s390x/cpu-topology.c | 4 +-
>> target/s390x/kvm/kvm.c | 5 +-
>> target/s390x/kvm/stsi-topology.c | 310 +++++++++++++++++++++++++++++++
>> target/s390x/kvm/meson.build | 3 +-
>> 9 files changed, 436 insertions(+), 3 deletions(-)
>> create mode 100644 target/s390x/kvm/stsi-topology.c
> [...]
>
>> typedef struct S390Topology {
>> uint8_t *cores_per_socket;
>> + bool polarization;
> You don't use this as a bool and since it's no longer called
> vertical_polarization, it's not longer entirely clear what the value
> means so I think this should be a CpuS390Polarization.
> That also makes the assignment in patch 12 clearer since it assigns the
> same type.
>
> [...]
right, I make the change
Thanks
Pierre
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command
2023-06-30 9:17 ` [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command Pierre Morel
2023-07-05 7:58 ` Thomas Huth
@ 2023-07-26 11:54 ` Nina Schoetterl-Glausch
1 sibling, 0 replies; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-26 11:54 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> The query-cpu-polarization qmp command returns the current
> CPU polarization of the machine.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
[...]
^ permalink raw reply [flat|nested] 78+ messages in thread
* Re: [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB
2023-06-30 9:17 ` [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB Pierre Morel
2023-07-04 11:40 ` Thomas Huth
2023-07-25 15:41 ` Nina Schoetterl-Glausch
@ 2023-07-27 17:31 ` Nina Schoetterl-Glausch
2 siblings, 0 replies; 78+ messages in thread
From: Nina Schoetterl-Glausch @ 2023-07-27 17:31 UTC (permalink / raw)
To: Pierre Morel, qemu-s390x
Cc: qemu-devel, borntraeger, pasic, richard.henderson, david, thuth,
cohuck, mst, pbonzini, kvm, ehabkost, marcel.apfelbaum, eblake,
armbru, seiden, nrb, frankja, berrange, clg
On Fri, 2023-06-30 at 11:17 +0200, Pierre Morel wrote:
> On interception of STSI(15.1.x) the System Information Block
> (SYSIB) is built from the list of pre-ordered topology entries.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> MAINTAINERS | 1 +
> qapi/machine-target.json | 14 ++
> include/hw/s390x/cpu-topology.h | 25 +++
> include/hw/s390x/sclp.h | 1 +
> target/s390x/cpu.h | 76 ++++++++
> hw/s390x/cpu-topology.c | 4 +-
> target/s390x/kvm/kvm.c | 5 +-
> target/s390x/kvm/stsi-topology.c | 310 +++++++++++++++++++++++++++++++
> target/s390x/kvm/meson.build | 3 +-
> 9 files changed, 436 insertions(+), 3 deletions(-)
> create mode 100644 target/s390x/kvm/stsi-topology.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 0b03ac5a9b..b8d3e8815c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1702,6 +1702,7 @@ M: Pierre Morel <pmorel@linux.ibm.com>
> S: Supported
> F: include/hw/s390x/cpu-topology.h
> F: hw/s390x/cpu-topology.c
> +F: target/s390x/kvm/stsi-topology.c
>
> X86 Machines
> ------------
> diff --git a/qapi/machine-target.json b/qapi/machine-target.json
> index 3362f8dc3f..8ea4834e63 100644
> --- a/qapi/machine-target.json
> +++ b/qapi/machine-target.json
> @@ -361,3 +361,17 @@
> 'TARGET_MIPS',
> 'TARGET_LOONGARCH64',
> 'TARGET_RISCV' ] } }
> +
> +##
> +# @CpuS390Polarization:
> +#
> +# An enumeration of cpu polarization that can be assumed by a virtual
> +# S390 CPU
> +#
> +# Since: 8.1
> +##
> +{ 'enum': 'CpuS390Polarization',
> + 'prefix': 'S390_CPU_POLARIZATION',
> + 'data': [ 'horizontal', 'vertical' ],
> + 'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] }
> +}
> diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h
> index 9164ac00a7..193b33a2fc 100644
> --- a/include/hw/s390x/cpu-topology.h
> +++ b/include/hw/s390x/cpu-topology.h
> @@ -15,10 +15,35 @@
> #include "hw/boards.h"
> #include "qapi/qapi-types-machine-target.h"
>
> +#define S390_TOPOLOGY_CPU_IFL 0x03
> +
> +typedef union s390_topology_id {
> + uint64_t id;
> + struct {
> + uint8_t sentinel;
> + uint8_t drawer;
> + uint8_t book;
> + uint8_t socket;
> + uint8_t dedicated;
> + uint8_t entitlement;
> + uint8_t type;
> + uint8_t origin;
The order here is not quite right according to the PoP. Type should be
higher, after socket, such that all cpus of the same type in a socket
are stored as a block.
Also entitlement and dedication need to be inverted, e.g such that
dedicated cpus are shown before non dedicated ones.
> + };
> +} s390_topology_id;
> +
[...]
> +/**
> + * s390_topology_empty_list:
> + *
> + * Clear all entries in the S390Topology list except the sentinel.
The comment is out of date.
> + */
> +static void s390_topology_empty_list(S390TopologyList *topology_list)
> +{
> + S390TopologyEntry *entry = NULL;
> + S390TopologyEntry *tmp = NULL;
> +
> + QTAILQ_FOREACH_SAFE(entry, topology_list, next, tmp) {
> + QTAILQ_REMOVE(topology_list, entry, next);
> + g_free(entry);
> + }
> +}
> +
> +/**
> + * insert_stsi_15_1_x:
> + * cpu: the CPU doing the call for which we set CC
> + * sel2: the selector 2, containing the nested level
> + * addr: Guest logical address of the guest SysIB
> + * ar: the access register number
> + *
> + * Create a list head for the Topology entries and initialize it.
> + * Insert the first entry as a sentinelle.
> + *
> + * Emulate STSI 15.1.x, that is, perform all necessary checks and
> + * fill the SYSIB.
> + * In case the topology description is too long to fit into the SYSIB,
> + * set CC=3 and abort without writing the SYSIB.
> + */
> +void insert_stsi_15_1_x(S390CPU *cpu, int sel2, uint64_t addr, uint8_t ar)
> +{
> + S390TopologyList topology_list;
> + S390TopologyEntry *entry;
> + SysIB sysib = {0};
> + int length;
> +
> + if (!s390_has_topology() || sel2 < 2 || sel2 > SCLP_READ_SCP_INFO_MNEST) {
> + setcc(cpu, 3);
> + return;
> + }
> +
> + QTAILQ_INIT(&topology_list);
> + entry = g_malloc0(sizeof(S390TopologyEntry));
> + entry->id.sentinel = 0xff;
> + QTAILQ_INSERT_HEAD(&topology_list, entry, next);
> +
> + s390_topology_fill_list_sorted(&topology_list);
> +
> + length = setup_stsi(&topology_list, &sysib.sysib_151x, sel2);
> +
> + if (!length) {
> + setcc(cpu, 3);
> + return;
> + }
> +
> + sysib.sysib_151x.length = cpu_to_be16(length);
> + s390_cpu_virt_mem_write(cpu, addr, ar, &sysib, length);
> + setcc(cpu, 0);
> +
> + s390_topology_empty_list(&topology_list);
> +}
> diff --git a/target/s390x/kvm/meson.build b/target/s390x/kvm/meson.build
> index 37253f75bf..bcf014ba87 100644
> --- a/target/s390x/kvm/meson.build
> +++ b/target/s390x/kvm/meson.build
> @@ -1,6 +1,7 @@
>
> s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
> - 'kvm.c'
> + 'kvm.c',
> + 'stsi-topology.c'
> ), if_false: files(
> 'stubs.c'
> ))
^ permalink raw reply [flat|nested] 78+ messages in thread
end of thread, other threads:[~2023-07-27 17:32 UTC | newest]
Thread overview: 78+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-06-30 9:17 [PATCH v21 00/20] s390x: CPU Topology Pierre Morel
2023-06-30 9:17 ` [PATCH v21 01/20] s390x/cpu topology: add s390 specifics to CPU topology Pierre Morel
2023-07-18 16:31 ` Nina Schoetterl-Glausch
2023-07-21 11:24 ` Pierre Morel
2023-07-24 10:15 ` Nina Schoetterl-Glausch
2023-07-25 8:43 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 02/20] s390x/cpu topology: add topology entries on CPU hotplug Pierre Morel
2023-07-04 10:32 ` Thomas Huth
2023-07-12 11:20 ` Pierre Morel
2023-07-24 20:19 ` Nina Schoetterl-Glausch
2023-07-25 8:44 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 03/20] target/s390x/cpu topology: handle STSI(15) and build the SYSIB Pierre Morel
2023-07-04 11:40 ` Thomas Huth
2023-07-04 12:27 ` Thomas Huth
2023-07-12 14:24 ` Pierre Morel
2023-07-12 20:14 ` Thomas Huth
2023-07-25 15:41 ` Nina Schoetterl-Glausch
2023-07-26 8:11 ` Pierre Morel
2023-07-27 17:31 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 04/20] s390x/sclp: reporting the maximum nested topology entries Pierre Morel
2023-06-30 9:17 ` [PATCH v21 05/20] s390x/cpu topology: resetting the Topology-Change-Report Pierre Morel
2023-07-25 13:43 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 06/20] s390x/cpu topology: interception of PTF instruction Pierre Morel
2023-07-04 12:16 ` Thomas Huth
2023-07-12 14:40 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 07/20] target/s390x/cpu topology: activate CPU topology Pierre Morel
2023-06-30 9:17 ` [PATCH v21 08/20] qapi/s390x/cpu topology: set-cpu-topology qmp command Pierre Morel
2023-07-04 12:53 ` Thomas Huth
2023-07-12 14:45 ` Pierre Morel
2023-07-18 7:54 ` Nina Schoetterl-Glausch
2023-07-18 12:25 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 09/20] machine: adding s390 topology to query-cpu-fast Pierre Morel
2023-07-04 12:55 ` Thomas Huth
2023-07-12 15:44 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 10/20] machine: adding s390 topology to info hotpluggable-cpus Pierre Morel
2023-07-04 12:59 ` Thomas Huth
2023-07-12 16:02 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 11/20] qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE qapi event Pierre Morel
2023-07-04 13:04 ` Thomas Huth
2023-07-12 16:05 ` Pierre Morel
2023-07-18 7:59 ` Nina Schoetterl-Glausch
2023-07-18 12:34 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 12/20] qapi/s390x/cpu topology: query-cpu-polarization qmp command Pierre Morel
2023-07-05 7:58 ` Thomas Huth
2023-07-12 16:12 ` Pierre Morel
2023-07-26 11:54 ` Nina Schoetterl-Glausch
2023-06-30 9:17 ` [PATCH v21 13/20] docs/s390x/cpu topology: document s390x cpu topology Pierre Morel
2023-07-05 8:41 ` Thomas Huth
2023-07-12 16:27 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 14/20] tests/avocado: s390x cpu topology core Pierre Morel
2023-07-04 13:14 ` Thomas Huth
2023-07-19 9:24 ` Pierre Morel
2023-07-12 20:00 ` Nina Schoetterl-Glausch
2023-07-19 11:05 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 15/20] tests/avocado: s390x cpu topology polarisation Pierre Morel
2023-07-05 8:53 ` Thomas Huth
2023-07-19 11:35 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 16/20] tests/avocado: s390x cpu topology entitlement tests Pierre Morel
2023-07-05 10:22 ` Thomas Huth
2023-07-12 19:37 ` Nina Schoetterl-Glausch
2023-07-12 20:11 ` Thomas Huth
2023-07-14 16:30 ` Nina Schoetterl-Glausch
2023-07-19 14:08 ` Pierre Morel
2023-07-19 14:13 ` Nina Schoetterl-Glausch
2023-07-19 15:34 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 17/20] tests/avocado: s390x cpu topology test dedicated CPU Pierre Morel
2023-07-19 14:09 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 18/20] tests/avocado: s390x cpu topology test socket full Pierre Morel
2023-07-05 10:26 ` Thomas Huth
2023-07-19 14:21 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 19/20] tests/avocado: s390x cpu topology dedicated errors Pierre Morel
2023-07-05 10:28 ` Thomas Huth
2023-07-19 14:21 ` Pierre Morel
2023-06-30 9:17 ` [PATCH v21 20/20] tests/avocado: s390x cpu topology bad move Pierre Morel
2023-07-05 10:32 ` Thomas Huth
2023-07-19 14:23 ` Pierre Morel
2023-07-05 10:02 ` [PATCH v21 00/20] s390x: CPU Topology Thomas Huth
2023-07-19 15:27 ` Pierre Morel
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