[Qemu-devel] [PULL 00/18] ppc-for-2.10 queue 20170525

[Qemu-devel] [PULL 00/18] ppc-for-2.10 queue 20170525

[David Gibson]

The following changes since commit 9964e96dc9999cf7f7c936ee854a795415d19b60:

  Merge remote-tracking branch 'jasowang/tags/net-pull-request' into staging (2017-05-23 15:01:31 +0100)

are available in the git repository at:

  git://github.com/dgibson/qemu.git tags/ppc-for-2.10-20170525

for you to fetch changes up to 62f94fc94f98095173146e753a1f03d7c2cc7ba3:

  xics: add unrealize handler (2017-05-25 11:31:33 +1000)

----------------------------------------------------------------
ppc patch queue 2017-05-25

Assorted accumulated patches.  These are nearly all bugfixes at one
level or another - some for longstanding problems, others for some
regressions caused by more recent cleanups.

This includes preliminary patches towards fixing migration for Radix
Page Table guests under POWER9 and also fixing some migration
regressions due to the re-organization of the interrupt controller
code.  Not all the pieces are there yet, so those still won't quite
work, but the preliminary changes make sense on their own.

----------------------------------------------------------------
Bharata B Rao (1):
      spapr: Consolidate HPT freeing code into a routine

Daniel Henrique Barboza (4):
      hw/ppc/spapr_events.c: removing 'exception' from sPAPREventLogEntry
      hw/ppc: removing drc->detach_cb and drc->detach_cb_opaque
      hw/ppc: migrating the DRC state of hotplugged devices
      hw/ppc/spapr.c: recover pending LMB unplug info in spapr_lmb_release

David Gibson (3):
      pseries: Split CAS PVR negotiation out into a separate function
      pseries: Restore support for total vcpus not a multiple of threads-per-core for old machine types
      hw/ppc/spapr.c: adding pending_dimm_unplugs to sPAPRMachineState

Greg Kurz (8):
      ppc/xics: simplify prototype of xics_spapr_init()
      spapr: sanitize error handling in spapr_ics_create()
      spapr-cpu-core: release ICP object when realization fails
      xics_kvm: cache already enabled vCPU ids
      spapr: ensure core_slot isn't NULL in spapr_core_unplug()
      spapr_cpu_core: drop reference on ICP object during CPU realization
      spapr: fix error reporting in xics_system_init()
      xics: add unrealize handler

Laurent Vivier (1):
      spapr: add pre_plug function for memory

Nikunj A Dadhania (1):
      target/ppc: reset reservation in do_rfi()

 hw/intc/xics.c              |   5 +
 hw/intc/xics_kvm.c          |  33 ++++--
 hw/intc/xics_spapr.c        |   3 +-
 hw/ppc/spapr.c              | 239 +++++++++++++++++++++++++++++++-------------
 hw/ppc/spapr_cpu_core.c     |  19 ++--
 hw/ppc/spapr_drc.c          |  92 ++++++++++++++---
 hw/ppc/spapr_events.c       |  52 ++--------
 hw/ppc/spapr_hcall.c        |  54 ++++++----
 hw/ppc/spapr_pci.c          |   5 +-
 include/hw/pci-host/spapr.h |   3 +
 include/hw/ppc/spapr.h      |  12 ++-
 include/hw/ppc/spapr_drc.h  |   8 +-
 include/hw/ppc/xics.h       |   3 +-
 target/ppc/excp_helper.c    |   3 +
 14 files changed, 349 insertions(+), 182 deletions(-)

[Qemu-devel] [PULL 01/18] target/ppc: reset reservation in do_rfi()

[David Gibson]

From: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>

For transitioning back to userspace after the interrupt.

Suggested-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 target/ppc/excp_helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index a6bcb47..9cb2123 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -995,6 +995,9 @@ static inline void do_rfi(CPUPPCState *env, target_ulong nip, target_ulong msr)
      */
     cs->interrupt_request |= CPU_INTERRUPT_EXITTB;
 
+    /* Reset the reservation */
+    env->reserve_addr = -1;
+
     /* Context synchronizing: check if TCG TLB needs flush */
     check_tlb_flush(env, false);
 }
-- 
2.9.4

[Qemu-devel] [PULL 02/18] ppc/xics: simplify prototype of xics_spapr_init()

[David Gibson]

From: Greg Kurz <groug@kaod.org>

This function only does hypercall and RTAS-call registration, and thus
never returns an error. This patch adapt the prototype to reflect that.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/intc/xics_spapr.c  | 3 +--
 hw/ppc/spapr.c        | 2 +-
 include/hw/ppc/xics.h | 2 +-
 3 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/hw/intc/xics_spapr.c b/hw/intc/xics_spapr.c
index f05308b8..d98ea8b 100644
--- a/hw/intc/xics_spapr.c
+++ b/hw/intc/xics_spapr.c
@@ -229,7 +229,7 @@ static void rtas_int_on(PowerPCCPU *cpu, sPAPRMachineState *spapr,
     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 }
 
-int xics_spapr_init(sPAPRMachineState *spapr, Error **errp)
+void xics_spapr_init(sPAPRMachineState *spapr)
 {
     /* Registration of global state belongs into realize */
     spapr_rtas_register(RTAS_IBM_SET_XIVE, "ibm,set-xive", rtas_set_xive);
@@ -243,7 +243,6 @@ int xics_spapr_init(sPAPRMachineState *spapr, Error **errp)
     spapr_register_hypercall(H_XIRR_X, h_xirr_x);
     spapr_register_hypercall(H_EOI, h_eoi);
     spapr_register_hypercall(H_IPOLL, h_ipoll);
-    return 0;
 }
 
 #define ICS_IRQ_FREE(ics, srcno)   \
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 0980d73..18709ad 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -139,7 +139,7 @@ static void xics_system_init(MachineState *machine, int nr_irqs, Error **errp)
     }
 
     if (!spapr->ics) {
-        xics_spapr_init(spapr, errp);
+        xics_spapr_init(spapr);
         spapr->icp_type = TYPE_ICP;
         spapr->ics = spapr_ics_create(spapr, TYPE_ICS_SIMPLE, nr_irqs, errp);
     }
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index 05e6acb..d6cb51f 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -206,6 +206,6 @@ void icp_resend(ICPState *ss);
 typedef struct sPAPRMachineState sPAPRMachineState;
 
 int xics_kvm_init(sPAPRMachineState *spapr, Error **errp);
-int xics_spapr_init(sPAPRMachineState *spapr, Error **errp);
+void xics_spapr_init(sPAPRMachineState *spapr);
 
 #endif /* XICS_H */
-- 
2.9.4

[Qemu-devel] [PULL 03/18] spapr: sanitize error handling in spapr_ics_create()

[David Gibson]

From: Greg Kurz <groug@kaod.org>

The spapr_ics_create() function handles errors in a rather convoluted
way, with two local Error * variables. Moreover, failing to parent the
ICS object to the machine should be considered as a bug but it is
currently ignored.

This patch addresses both issues.

Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 18709ad..a9471b9 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -101,21 +101,26 @@ static ICSState *spapr_ics_create(sPAPRMachineState *spapr,
                                   const char *type_ics,
                                   int nr_irqs, Error **errp)
 {
-    Error *err = NULL, *local_err = NULL;
+    Error *local_err = NULL;
     Object *obj;
 
     obj = object_new(type_ics);
-    object_property_add_child(OBJECT(spapr), "ics", obj, NULL);
+    object_property_add_child(OBJECT(spapr), "ics", obj, &error_abort);
     object_property_add_const_link(obj, "xics", OBJECT(spapr), &error_abort);
-    object_property_set_int(obj, nr_irqs, "nr-irqs", &err);
+    object_property_set_int(obj, nr_irqs, "nr-irqs", &local_err);
+    if (local_err) {
+        goto error;
+    }
     object_property_set_bool(obj, true, "realized", &local_err);
-    error_propagate(&err, local_err);
-    if (err) {
-        error_propagate(errp, err);
-        return NULL;
+    if (local_err) {
+        goto error;
     }
 
     return ICS_SIMPLE(obj);
+
+error:
+    error_propagate(errp, local_err);
+    return NULL;
 }
 
 static void xics_system_init(MachineState *machine, int nr_irqs, Error **errp)
-- 
2.9.4

[Qemu-devel] [PULL 04/18] spapr-cpu-core: release ICP object when realization fails

[David Gibson]

From: Greg Kurz <groug@kaod.org>

While here we introduce a single error path to avoid code duplication.

Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr_cpu_core.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index a17ea07..1df1404 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -147,25 +147,25 @@ static void spapr_cpu_core_realize_child(Object *child, Error **errp)
     object_property_add_const_link(obj, "xics", OBJECT(spapr), &error_abort);
     object_property_set_bool(obj, true, "realized", &local_err);
     if (local_err) {
-        error_propagate(errp, local_err);
-        return;
+        goto error;
     }
 
     object_property_set_bool(child, true, "realized", &local_err);
     if (local_err) {
-        object_unparent(obj);
-        error_propagate(errp, local_err);
-        return;
+        goto error;
     }
 
     spapr_cpu_init(spapr, cpu, &local_err);
     if (local_err) {
-        object_unparent(obj);
-        error_propagate(errp, local_err);
-        return;
+        goto error;
     }
 
     xics_cpu_setup(XICS_FABRIC(spapr), cpu, ICP(obj));
+    return;
+
+error:
+    object_unparent(obj);
+    error_propagate(errp, local_err);
 }
 
 static void spapr_cpu_core_realize(DeviceState *dev, Error **errp)
-- 
2.9.4

[Qemu-devel] [PULL 05/18] spapr: Consolidate HPT freeing code into a routine

[David Gibson]

From: Bharata B Rao <bharata@linux.vnet.ibm.com>

Consolidate the code that frees HPT into a separate routine
spapr_free_hpt() as the same chunk of code is called from two places.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c         | 13 +++++++++----
 hw/ppc/spapr_hcall.c   |  5 +----
 include/hw/ppc/spapr.h |  1 +
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index a9471b9..35dceb0 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1227,16 +1227,21 @@ static int spapr_hpt_shift_for_ramsize(uint64_t ramsize)
     return shift;
 }
 
+void spapr_free_hpt(sPAPRMachineState *spapr)
+{
+    g_free(spapr->htab);
+    spapr->htab = NULL;
+    spapr->htab_shift = 0;
+    close_htab_fd(spapr);
+}
+
 static void spapr_reallocate_hpt(sPAPRMachineState *spapr, int shift,
                                  Error **errp)
 {
     long rc;
 
     /* Clean up any HPT info from a previous boot */
-    g_free(spapr->htab);
-    spapr->htab = NULL;
-    spapr->htab_shift = 0;
-    close_htab_fd(spapr);
+    spapr_free_hpt(spapr);
 
     rc = kvmppc_reset_htab(shift);
     if (rc < 0) {
diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 0d608d6..2daace4 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -913,10 +913,7 @@ static void spapr_check_setup_free_hpt(sPAPRMachineState *spapr,
         /* We assume RADIX, so this catches all the "Do Nothing" cases */
     } else if (!(patbe_old & PATBE1_GR)) {
         /* HASH->RADIX : Free HPT */
-        g_free(spapr->htab);
-        spapr->htab = NULL;
-        spapr->htab_shift = 0;
-        close_htab_fd(spapr);
+        spapr_free_hpt(spapr);
     } else if (!(patbe_new & PATBE1_GR)) {
         /* RADIX->HASH || NOTHING->HASH : Allocate HPT */
         spapr_setup_hpt_and_vrma(spapr);
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 5802f88..93c4cfc 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -610,6 +610,7 @@ int spapr_h_cas_compose_response(sPAPRMachineState *sm,
                                  sPAPROptionVector *ov5_updates);
 void close_htab_fd(sPAPRMachineState *spapr);
 void spapr_setup_hpt_and_vrma(sPAPRMachineState *spapr);
+void spapr_free_hpt(sPAPRMachineState *spapr);
 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn);
 void spapr_tce_table_enable(sPAPRTCETable *tcet,
                             uint32_t page_shift, uint64_t bus_offset,
-- 
2.9.4

[Qemu-devel] [PULL 06/18] xics_kvm: cache already enabled vCPU ids

[David Gibson]

From: Greg Kurz <groug@kaod.org>

Since commit a45863bda90d ("xics_kvm: Don't enable KVM_CAP_IRQ_XICS if
already enabled"), we were able to re-hotplug a vCPU that had been hot-
unplugged ealier, thanks to a boolean flag in ICPState that we set when
enabling KVM_CAP_IRQ_XICS.

This could work because the lifecycle of all ICPState objects was the
same as the machine. Commit 5bc8d26de20c ("spapr: allocate the ICPState
object from under sPAPRCPUCore") broke this assumption and now we always
pass a freshly allocated ICPState object (ie, with the flag unset) to
icp_kvm_cpu_setup().

This cause re-hotplug to fail with:

Unable to connect CPU8 to kernel XICS: Device or resource busy

Let's fix this by caching all the vCPU ids for which KVM_CAP_IRQ_XICS was
enabled. This also drops the now useless boolean flag from ICPState.

Reported-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/intc/xics_kvm.c    | 27 ++++++++++++++++++++-------
 include/hw/ppc/xics.h |  1 -
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
index dd93531..dd7f298 100644
--- a/hw/intc/xics_kvm.c
+++ b/hw/intc/xics_kvm.c
@@ -42,6 +42,14 @@
 
 static int kernel_xics_fd = -1;
 
+typedef struct KVMEnabledICP {
+    unsigned long vcpu_id;
+    QLIST_ENTRY(KVMEnabledICP) node;
+} KVMEnabledICP;
+
+static QLIST_HEAD(, KVMEnabledICP)
+    kvm_enabled_icps = QLIST_HEAD_INITIALIZER(&kvm_enabled_icps);
+
 /*
  * ICP-KVM
  */
@@ -121,6 +129,8 @@ static void icp_kvm_reset(void *dev)
 static void icp_kvm_cpu_setup(ICPState *icp, PowerPCCPU *cpu)
 {
     CPUState *cs = CPU(cpu);
+    KVMEnabledICP *enabled_icp;
+    unsigned long vcpu_id = kvm_arch_vcpu_id(cs);
     int ret;
 
     if (kernel_xics_fd == -1) {
@@ -132,18 +142,21 @@ static void icp_kvm_cpu_setup(ICPState *icp, PowerPCCPU *cpu)
      * which was hot-removed earlier we don't have to renable
      * KVM_CAP_IRQ_XICS capability again.
      */
-    if (icp->cap_irq_xics_enabled) {
-        return;
+    QLIST_FOREACH(enabled_icp, &kvm_enabled_icps, node) {
+        if (enabled_icp->vcpu_id == vcpu_id) {
+            return;
+        }
     }
 
-    ret = kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_XICS, 0, kernel_xics_fd,
-                              kvm_arch_vcpu_id(cs));
+    ret = kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_XICS, 0, kernel_xics_fd, vcpu_id);
     if (ret < 0) {
-        error_report("Unable to connect CPU%ld to kernel XICS: %s",
-                     kvm_arch_vcpu_id(cs), strerror(errno));
+        error_report("Unable to connect CPU%ld to kernel XICS: %s", vcpu_id,
+                     strerror(errno));
         exit(1);
     }
-    icp->cap_irq_xics_enabled = true;
+    enabled_icp = g_malloc(sizeof(*enabled_icp));
+    enabled_icp->vcpu_id = vcpu_id;
+    QLIST_INSERT_HEAD(&kvm_enabled_icps, enabled_icp, node);
 }
 
 static void icp_kvm_realize(DeviceState *dev, Error **errp)
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index d6cb51f..a3073f9 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -81,7 +81,6 @@ struct ICPState {
     uint8_t pending_priority;
     uint8_t mfrr;
     qemu_irq output;
-    bool cap_irq_xics_enabled;
 
     XICSFabric *xics;
 };
-- 
2.9.4

[Qemu-devel] [PULL 07/18] spapr: ensure core_slot isn't NULL in spapr_core_unplug()

[David Gibson]

From: Greg Kurz <groug@kaod.org>

If we go that far on the path of hot-removing a core and we find out that
the core-id is invalid, then we have a serious bug.

Let's make it explicit with an assert() instead of dereferencing a NULL
pointer.

This fixes Coverity issue CID 1375404.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 35dceb0..c912eaa 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2725,6 +2725,7 @@ static void spapr_core_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
     CPUCore *cc = CPU_CORE(dev);
     CPUArchId *core_slot = spapr_find_cpu_slot(ms, cc->core_id, NULL);
 
+    assert(core_slot);
     core_slot->cpu = NULL;
     object_unparent(OBJECT(dev));
 }
-- 
2.9.4

[Qemu-devel] [PULL 08/18] hw/ppc/spapr_events.c: removing 'exception' from sPAPREventLogEntry

[David Gibson]

From: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>

Currenty we do not have any RTAS event that is reported by the
event-scan interface. The existing events, RTAS_LOG_TYPE_EPOW and
RTAS_LOG_TYPE_HOTPLUG, are being reported by the check-exception
interface and, as such, marked as 'exception=true'.

Commit 79853e18d9, 'spapr_events: event-scan RTAS interface', added
the event_scan interface because the guest kernel requires it to
initialize other required interfaces. It is acting since then as
a stub because no events that would be reported by it were added
since then. However, the existence of the 'exception' boolean adds
an unnecessary load in the future migration of the pending_events,
sPAPREventLogEntry QTAILQ that hosts the pending RTAS events.

To make the code cleaner and ease the future migration changes, this
patch makes the following changes:

- remove the 'exception' boolean that filter these events. There is
nothing to filter since all events are reported by check-exception;

- functions rtas_event_log_queue, rtas_event_log_dequeue and
rtas_event_log_contains don't receive the 'exception' boolean
as parameter;

- event_scan function was simplified. It was calling
'rtas_event_log_dequeue(mask, false)' that was always returning
'NULL' because we have no events that are created with
exception=false, thus in the end it would execute a jump to
'out_no_events' all the time. The function now assumes that
this will always be the case and all the remaining logic were
deleted.

In the future, when or if we add new RTAS events that should
be reported with the event_scan interface, we can refer to
the changes made in this patch to add the event_scan logic
back.

Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr_events.c  | 52 +++++++-------------------------------------------
 include/hw/ppc/spapr.h |  1 -
 2 files changed, 7 insertions(+), 46 deletions(-)

diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
index f0b28d8..73e2a18 100644
--- a/hw/ppc/spapr_events.c
+++ b/hw/ppc/spapr_events.c
@@ -342,20 +342,18 @@ static int rtas_event_log_to_irq(sPAPRMachineState *spapr, int log_type)
     return source->irq;
 }
 
-static void rtas_event_log_queue(int log_type, void *data, bool exception)
+static void rtas_event_log_queue(int log_type, void *data)
 {
     sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
     sPAPREventLogEntry *entry = g_new(sPAPREventLogEntry, 1);
 
     g_assert(data);
     entry->log_type = log_type;
-    entry->exception = exception;
     entry->data = data;
     QTAILQ_INSERT_TAIL(&spapr->pending_events, entry, next);
 }
 
-static sPAPREventLogEntry *rtas_event_log_dequeue(uint32_t event_mask,
-                                                  bool exception)
+static sPAPREventLogEntry *rtas_event_log_dequeue(uint32_t event_mask)
 {
     sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
     sPAPREventLogEntry *entry = NULL;
@@ -364,10 +362,6 @@ static sPAPREventLogEntry *rtas_event_log_dequeue(uint32_t event_mask,
         const sPAPREventSource *source =
             rtas_event_log_to_source(spapr, entry->log_type);
 
-        if (entry->exception != exception) {
-            continue;
-        }
-
         if (source->mask & event_mask) {
             break;
         }
@@ -380,7 +374,7 @@ static sPAPREventLogEntry *rtas_event_log_dequeue(uint32_t event_mask,
     return entry;
 }
 
-static bool rtas_event_log_contains(uint32_t event_mask, bool exception)
+static bool rtas_event_log_contains(uint32_t event_mask)
 {
     sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
     sPAPREventLogEntry *entry = NULL;
@@ -389,10 +383,6 @@ static bool rtas_event_log_contains(uint32_t event_mask, bool exception)
         const sPAPREventSource *source =
             rtas_event_log_to_source(spapr, entry->log_type);
 
-        if (entry->exception != exception) {
-            continue;
-        }
-
         if (source->mask & event_mask) {
             return true;
         }
@@ -479,7 +469,7 @@ static void spapr_powerdown_req(Notifier *n, void *opaque)
     epow->event_modifier = RTAS_LOG_V6_EPOW_MODIFIER_NORMAL;
     epow->extended_modifier = RTAS_LOG_V6_EPOW_XMODIFIER_PARTITION_SPECIFIC;
 
-    rtas_event_log_queue(RTAS_LOG_TYPE_EPOW, new_epow, true);
+    rtas_event_log_queue(RTAS_LOG_TYPE_EPOW, new_epow);
 
     qemu_irq_pulse(xics_get_qirq(XICS_FABRIC(spapr),
                                  rtas_event_log_to_irq(spapr,
@@ -572,7 +562,7 @@ static void spapr_hotplug_req_event(uint8_t hp_id, uint8_t hp_action,
             cpu_to_be32(drc_id->count_indexed.index);
     }
 
-    rtas_event_log_queue(RTAS_LOG_TYPE_HOTPLUG, new_hp, true);
+    rtas_event_log_queue(RTAS_LOG_TYPE_HOTPLUG, new_hp);
 
     qemu_irq_pulse(xics_get_qirq(XICS_FABRIC(spapr),
                                  rtas_event_log_to_irq(spapr,
@@ -667,7 +657,7 @@ static void check_exception(PowerPCCPU *cpu, sPAPRMachineState *spapr,
         xinfo |= (uint64_t)rtas_ld(args, 6) << 32;
     }
 
-    event = rtas_event_log_dequeue(mask, true);
+    event = rtas_event_log_dequeue(mask);
     if (!event) {
         goto out_no_events;
     }
@@ -690,7 +680,7 @@ static void check_exception(PowerPCCPU *cpu, sPAPRMachineState *spapr,
      * interrupts.
      */
     for (i = 0; i < EVENT_CLASS_MAX; i++) {
-        if (rtas_event_log_contains(EVENT_CLASS_MASK(i), true)) {
+        if (rtas_event_log_contains(EVENT_CLASS_MASK(i))) {
             const sPAPREventSource *source =
                 spapr_event_sources_get_source(spapr->event_sources, i);
 
@@ -710,38 +700,10 @@ static void event_scan(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                        target_ulong args,
                        uint32_t nret, target_ulong rets)
 {
-    uint32_t mask, buf, len, event_len;
-    sPAPREventLogEntry *event;
-    struct rtas_error_log *hdr;
-
     if (nargs != 4 || nret != 1) {
         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
         return;
     }
-
-    mask = rtas_ld(args, 0);
-    buf = rtas_ld(args, 2);
-    len = rtas_ld(args, 3);
-
-    event = rtas_event_log_dequeue(mask, false);
-    if (!event) {
-        goto out_no_events;
-    }
-
-    hdr = event->data;
-    event_len = be32_to_cpu(hdr->extended_length) + sizeof(*hdr);
-
-    if (event_len < len) {
-        len = event_len;
-    }
-
-    cpu_physical_memory_write(buf, event->data, len);
-    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
-    g_free(event->data);
-    g_free(event);
-    return;
-
-out_no_events:
     rtas_st(rets, 0, RTAS_OUT_NO_ERRORS_FOUND);
 }
 
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 93c4cfc..8f424ca 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -598,7 +598,6 @@ sPAPRTCETable *spapr_tce_find_by_liobn(target_ulong liobn);
 
 struct sPAPREventLogEntry {
     int log_type;
-    bool exception;
     void *data;
     QTAILQ_ENTRY(sPAPREventLogEntry) next;
 };
-- 
2.9.4

[Qemu-devel] [PULL 09/18] spapr_cpu_core: drop reference on ICP object during CPU realization

[David Gibson]

From: Greg Kurz <groug@kaod.org>

When a piece of code allocates an object, it implicitely gets a reference
on it. If it then makes that object a child property of another object, it
should drop its own reference at some point otherwise the child object can
never be finalized. The current code hence leaks one ICP object per CPU
when hot-removing a core.

Failing to add a newly allocated ICP object to the CPU is a bug. While here,
let's ensure QEMU aborts if this ever happens.

Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr_cpu_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index 1df1404..ff7058e 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -143,7 +143,8 @@ static void spapr_cpu_core_realize_child(Object *child, Error **errp)
     Object *obj;
 
     obj = object_new(spapr->icp_type);
-    object_property_add_child(OBJECT(cpu), "icp", obj, NULL);
+    object_property_add_child(OBJECT(cpu), "icp", obj, &error_abort);
+    object_unref(obj);
     object_property_add_const_link(obj, "xics", OBJECT(spapr), &error_abort);
     object_property_set_bool(obj, true, "realized", &local_err);
     if (local_err) {
-- 
2.9.4

[Qemu-devel] [PULL 10/18] spapr: fix error reporting in xics_system_init()

[David Gibson]

From: Greg Kurz <groug@kaod.org>

If the user explicitely asked for kernel-irqchip support and "xics-kvm"
initialization fails, we shouldn't fallback to emulated "xics" as we
do now. It is also awkward to print an error message when we have an
errp pointer argument.

Let's use the errp argument to report the error and let the caller decide.
This simplifies the code as we don't need a local Error * here.

Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index c912eaa..c92d269 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -128,18 +128,14 @@ static void xics_system_init(MachineState *machine, int nr_irqs, Error **errp)
     sPAPRMachineState *spapr = SPAPR_MACHINE(machine);
 
     if (kvm_enabled()) {
-        Error *err = NULL;
-
         if (machine_kernel_irqchip_allowed(machine) &&
             !xics_kvm_init(spapr, errp)) {
             spapr->icp_type = TYPE_KVM_ICP;
-            spapr->ics = spapr_ics_create(spapr, TYPE_ICS_KVM, nr_irqs, &err);
+            spapr->ics = spapr_ics_create(spapr, TYPE_ICS_KVM, nr_irqs, errp);
         }
         if (machine_kernel_irqchip_required(machine) && !spapr->ics) {
-            error_reportf_err(err,
-                              "kernel_irqchip requested but unavailable: ");
-        } else {
-            error_free(err);
+            error_prepend(errp, "kernel_irqchip requested but unavailable: ");
+            return;
         }
     }
 
@@ -147,6 +143,9 @@ static void xics_system_init(MachineState *machine, int nr_irqs, Error **errp)
         xics_spapr_init(spapr);
         spapr->icp_type = TYPE_ICP;
         spapr->ics = spapr_ics_create(spapr, TYPE_ICS_SIMPLE, nr_irqs, errp);
+        if (!spapr->ics) {
+            return;
+        }
     }
 }
 
-- 
2.9.4

[Qemu-devel] [PULL 11/18] pseries: Split CAS PVR negotiation out into a separate function

[David Gibson]

Guests of the qemu machine type go through a feature negotiation process
known as "client architecture support" (CAS) during early boot.  This does
a number of things, one of which is finding a CPU compatibility mode which
can be supported by both guest and host.

In fact the CPU negotiation is probably the single most complex part of the
CAS process, so this splits it out into a helper function.  We've recently
made some mistakes in maintaining backward compatibility for old machine
types here.  Splitting this out will also make it easier to fix this.

This also adds a possibly useful error message if the negotiation fails
(i.e. if there isn't a CPU mode that's suitable for both guest and host).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
---
 hw/ppc/spapr_hcall.c | 49 ++++++++++++++++++++++++++++++++-----------------
 1 file changed, 32 insertions(+), 17 deletions(-)

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 2daace4..77d2d66 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1044,19 +1044,13 @@ static target_ulong h_signal_sys_reset(PowerPCCPU *cpu,
     }
 }
 
-static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
-                                                  sPAPRMachineState *spapr,
-                                                  target_ulong opcode,
-                                                  target_ulong *args)
+static uint32_t cas_check_pvr(PowerPCCPU *cpu, target_ulong *addr,
+                              Error **errp)
 {
-    target_ulong list = ppc64_phys_to_real(args[0]);
-    target_ulong ov_table;
     bool explicit_match = false; /* Matched the CPU's real PVR */
     uint32_t max_compat = cpu->max_compat;
     uint32_t best_compat = 0;
     int i;
-    sPAPROptionVector *ov1_guest, *ov5_guest, *ov5_cas_old, *ov5_updates;
-    bool guest_radix;
 
     /*
      * We scan the supplied table of PVRs looking for two things
@@ -1066,9 +1060,9 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
     for (i = 0; i < 512; ++i) {
         uint32_t pvr, pvr_mask;
 
-        pvr_mask = ldl_be_phys(&address_space_memory, list);
-        pvr = ldl_be_phys(&address_space_memory, list + 4);
-        list += 8;
+        pvr_mask = ldl_be_phys(&address_space_memory, *addr);
+        pvr = ldl_be_phys(&address_space_memory, *addr + 4);
+        *addr += 8;
 
         if (~pvr_mask & pvr) {
             break; /* Terminator record */
@@ -1087,17 +1081,38 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
         /* We couldn't find a suitable compatibility mode, and either
          * the guest doesn't support "raw" mode for this CPU, or raw
          * mode is disabled because a maximum compat mode is set */
-        return H_HARDWARE;
+        error_setg(errp, "Couldn't negotiate a suitable PVR during CAS");
+        return 0;
     }
 
     /* Parsing finished */
     trace_spapr_cas_pvr(cpu->compat_pvr, explicit_match, best_compat);
 
-    /* Update CPUs */
-    if (cpu->compat_pvr != best_compat) {
-        Error *local_err = NULL;
+    return best_compat;
+}
 
-        ppc_set_compat_all(best_compat, &local_err);
+static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
+                                                  sPAPRMachineState *spapr,
+                                                  target_ulong opcode,
+                                                  target_ulong *args)
+{
+    /* Working address in data buffer */
+    target_ulong addr = ppc64_phys_to_real(args[0]);
+    target_ulong ov_table;
+    uint32_t cas_pvr;
+    sPAPROptionVector *ov1_guest, *ov5_guest, *ov5_cas_old, *ov5_updates;
+    bool guest_radix;
+    Error *local_err = NULL;
+
+    cas_pvr = cas_check_pvr(cpu, &addr, &local_err);
+    if (local_err) {
+        error_report_err(local_err);
+        return H_HARDWARE;
+    }
+
+    /* Update CPUs */
+    if (cpu->compat_pvr != cas_pvr) {
+        ppc_set_compat_all(cas_pvr, &local_err);
         if (local_err) {
             error_report_err(local_err);
             return H_HARDWARE;
@@ -1105,7 +1120,7 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
     }
 
     /* For the future use: here @ov_table points to the first option vector */
-    ov_table = list;
+    ov_table = addr;
 
     ov1_guest = spapr_ovec_parse_vector(ov_table, 1);
     ov5_guest = spapr_ovec_parse_vector(ov_table, 5);
-- 
2.9.4

Re: [Qemu-devel] [Qemu-ppc] [PULL 11/18] pseries: Split CAS PVR negotiation out into a separate function

[Greg Kurz]

[-- Attachment #1: Type: text/plain, Size: 5172 bytes --]

On Thu, 25 May 2017 13:51:25 +1000
David Gibson <david@gibson.dropbear.id.au> wrote:

> Guests of the qemu machine type go through a feature negotiation process
> known as "client architecture support" (CAS) during early boot.  This does
> a number of things, one of which is finding a CPU compatibility mode which
> can be supported by both guest and host.
> 
> In fact the CPU negotiation is probably the single most complex part of the
> CAS process, so this splits it out into a helper function.  We've recently
> made some mistakes in maintaining backward compatibility for old machine
> types here.  Splitting this out will also make it easier to fix this.
> 
> This also adds a possibly useful error message if the negotiation fails
> (i.e. if there isn't a CPU mode that's suitable for both guest and host).
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> Reviewed-by: Laurent Vivier <lvivier@redhat.com>
> Reviewed-by: Greg Kurz <groug@kaod.org>
> ---

Any reason for not seing these patches as well in this pull request ?

pseries: Restore PVR negotiation logic for  pre-2.9 machine types
pseries: Improve tracing of CPU  compatibility negotiation

>  hw/ppc/spapr_hcall.c | 49 ++++++++++++++++++++++++++++++++-----------------
>  1 file changed, 32 insertions(+), 17 deletions(-)
> 
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index 2daace4..77d2d66 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1044,19 +1044,13 @@ static target_ulong h_signal_sys_reset(PowerPCCPU *cpu,
>      }
>  }
>  
> -static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
> -                                                  sPAPRMachineState *spapr,
> -                                                  target_ulong opcode,
> -                                                  target_ulong *args)
> +static uint32_t cas_check_pvr(PowerPCCPU *cpu, target_ulong *addr,
> +                              Error **errp)
>  {
> -    target_ulong list = ppc64_phys_to_real(args[0]);
> -    target_ulong ov_table;
>      bool explicit_match = false; /* Matched the CPU's real PVR */
>      uint32_t max_compat = cpu->max_compat;
>      uint32_t best_compat = 0;
>      int i;
> -    sPAPROptionVector *ov1_guest, *ov5_guest, *ov5_cas_old, *ov5_updates;
> -    bool guest_radix;
>  
>      /*
>       * We scan the supplied table of PVRs looking for two things
> @@ -1066,9 +1060,9 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
>      for (i = 0; i < 512; ++i) {
>          uint32_t pvr, pvr_mask;
>  
> -        pvr_mask = ldl_be_phys(&address_space_memory, list);
> -        pvr = ldl_be_phys(&address_space_memory, list + 4);
> -        list += 8;
> +        pvr_mask = ldl_be_phys(&address_space_memory, *addr);
> +        pvr = ldl_be_phys(&address_space_memory, *addr + 4);
> +        *addr += 8;
>  
>          if (~pvr_mask & pvr) {
>              break; /* Terminator record */
> @@ -1087,17 +1081,38 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
>          /* We couldn't find a suitable compatibility mode, and either
>           * the guest doesn't support "raw" mode for this CPU, or raw
>           * mode is disabled because a maximum compat mode is set */
> -        return H_HARDWARE;
> +        error_setg(errp, "Couldn't negotiate a suitable PVR during CAS");
> +        return 0;
>      }
>  
>      /* Parsing finished */
>      trace_spapr_cas_pvr(cpu->compat_pvr, explicit_match, best_compat);
>  
> -    /* Update CPUs */
> -    if (cpu->compat_pvr != best_compat) {
> -        Error *local_err = NULL;
> +    return best_compat;
> +}
>  
> -        ppc_set_compat_all(best_compat, &local_err);
> +static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
> +                                                  sPAPRMachineState *spapr,
> +                                                  target_ulong opcode,
> +                                                  target_ulong *args)
> +{
> +    /* Working address in data buffer */
> +    target_ulong addr = ppc64_phys_to_real(args[0]);
> +    target_ulong ov_table;
> +    uint32_t cas_pvr;
> +    sPAPROptionVector *ov1_guest, *ov5_guest, *ov5_cas_old, *ov5_updates;
> +    bool guest_radix;
> +    Error *local_err = NULL;
> +
> +    cas_pvr = cas_check_pvr(cpu, &addr, &local_err);
> +    if (local_err) {
> +        error_report_err(local_err);
> +        return H_HARDWARE;
> +    }
> +
> +    /* Update CPUs */
> +    if (cpu->compat_pvr != cas_pvr) {
> +        ppc_set_compat_all(cas_pvr, &local_err);
>          if (local_err) {
>              error_report_err(local_err);
>              return H_HARDWARE;
> @@ -1105,7 +1120,7 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
>      }
>  
>      /* For the future use: here @ov_table points to the first option vector */
> -    ov_table = list;
> +    ov_table = addr;
>  
>      ov1_guest = spapr_ovec_parse_vector(ov_table, 1);
>      ov5_guest = spapr_ovec_parse_vector(ov_table, 5);


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Re: [Qemu-devel] [Qemu-ppc] [PULL 11/18] pseries: Split CAS PVR negotiation out into a separate function

[David Gibson]

[-- Attachment #1: Type: text/plain, Size: 2184 bytes --]

On Mon, May 29, 2017 at 11:14:08PM +0200, Greg Kurz wrote:
> On Thu, 25 May 2017 13:51:25 +1000
> David Gibson <david@gibson.dropbear.id.au> wrote:
> 
> > Guests of the qemu machine type go through a feature negotiation process
> > known as "client architecture support" (CAS) during early boot.  This does
> > a number of things, one of which is finding a CPU compatibility mode which
> > can be supported by both guest and host.
> > 
> > In fact the CPU negotiation is probably the single most complex part of the
> > CAS process, so this splits it out into a helper function.  We've recently
> > made some mistakes in maintaining backward compatibility for old machine
> > types here.  Splitting this out will also make it easier to fix this.
> > 
> > This also adds a possibly useful error message if the negotiation fails
> > (i.e. if there isn't a CPU mode that's suitable for both guest and host).
> > 
> > Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > Reviewed-by: Laurent Vivier <lvivier@redhat.com>
> > Reviewed-by: Greg Kurz <groug@kaod.org>
> > ---
> 
> Any reason for not seing these patches as well in this pull request ?
> 
> pseries: Restore PVR negotiation logic for  pre-2.9 machine types
> pseries: Improve tracing of CPU  compatibility negotiation

Yes.  After more discussion; and comparison with analogous x86 cases
that came up with Igor's NUMA cleanups, I've decided that the
behaviour here while guest visible comes under the heading of a
firmware behaviour change, which we don't typically arrange 100%
matching behaviour for.  Meanwhile, I also found out more things that
suggest matching old behaviour correctly is going to be even messier
than I though.

So, I've decided that leaving the behaviour change in place is the
better course.  Note that it won't affect migration (at least after
the other compat/migration fixes are merged).

I'll reconsider if we observe a real problem in the wild with it.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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Re: [Qemu-devel] [Qemu-ppc] [PULL 11/18] pseries: Split CAS PVR negotiation out into a separate function

[Greg Kurz]

[-- Attachment #1: Type: text/plain, Size: 2207 bytes --]

On Wed, 31 May 2017 16:33:21 +1000
David Gibson <david@gibson.dropbear.id.au> wrote:

> On Mon, May 29, 2017 at 11:14:08PM +0200, Greg Kurz wrote:
> > On Thu, 25 May 2017 13:51:25 +1000
> > David Gibson <david@gibson.dropbear.id.au> wrote:
> >   
> > > Guests of the qemu machine type go through a feature negotiation process
> > > known as "client architecture support" (CAS) during early boot.  This does
> > > a number of things, one of which is finding a CPU compatibility mode which
> > > can be supported by both guest and host.
> > > 
> > > In fact the CPU negotiation is probably the single most complex part of the
> > > CAS process, so this splits it out into a helper function.  We've recently
> > > made some mistakes in maintaining backward compatibility for old machine
> > > types here.  Splitting this out will also make it easier to fix this.
> > > 
> > > This also adds a possibly useful error message if the negotiation fails
> > > (i.e. if there isn't a CPU mode that's suitable for both guest and host).
> > > 
> > > Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > > Reviewed-by: Laurent Vivier <lvivier@redhat.com>
> > > Reviewed-by: Greg Kurz <groug@kaod.org>
> > > ---  
> > 
> > Any reason for not seing these patches as well in this pull request ?
> > 
> > pseries: Restore PVR negotiation logic for  pre-2.9 machine types
> > pseries: Improve tracing of CPU  compatibility negotiation  
> 
> Yes.  After more discussion; and comparison with analogous x86 cases
> that came up with Igor's NUMA cleanups, I've decided that the
> behaviour here while guest visible comes under the heading of a
> firmware behaviour change, which we don't typically arrange 100%
> matching behaviour for.  Meanwhile, I also found out more things that
> suggest matching old behaviour correctly is going to be even messier
> than I though.
> 
> So, I've decided that leaving the behaviour change in place is the
> better course.  Note that it won't affect migration (at least after
> the other compat/migration fixes are merged).
> 
> I'll reconsider if we observe a real problem in the wild with it.
> 

Thanks for the detailed explanation!

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[Qemu-devel] [PULL 12/18] pseries: Restore support for total vcpus not a multiple of threads-per-core for old machine types

[David Gibson]

As of pseries-2.7 and later, we require the total number of guest vcpus to
be a multiple of the threads-per-core.  pseries-2.6 and earlier machine
types, however, are supposed to allow this for the sake of migration from
old qemu versions which allowed this.

Unfortunately, 8149e29 "pseries: Enforce homogeneous threads-per-core"
broke this by not considering the old machine type case.  This fixes it by
only applying the check when the machine type supports hotpluggable cpus.
By not-entirely-coincidence, that corresponds to the same time when we
started enforcing total threads being a multiple of threads-per-core.

Fixes: 8149e2992f7811355cc34721b79d69d1a3a667dd

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Tested-by: Greg Kurz <groug@kaod.org>
---
 hw/ppc/spapr.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index c92d269..bcb0e18 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2863,7 +2863,13 @@ static void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
         goto out;
     }
 
-    if (cc->nr_threads != smp_threads) {
+    /*
+     * In general we should have homogeneous threads-per-core, but old
+     * (pre hotplug support) machine types allow the last core to have
+     * reduced threads as a compatibility hack for when we allowed
+     * total vcpus not a multiple of threads-per-core.
+     */
+    if (mc->has_hotpluggable_cpus && (cc->nr_threads != smp_threads)) {
         error_setg(errp, "invalid nr-threads %d, must be %d",
                    cc->nr_threads, smp_threads);
         return;
-- 
2.9.4

[Qemu-devel] [PULL 13/18] spapr: add pre_plug function for memory

[David Gibson]

From: Laurent Vivier <lvivier@redhat.com>

This allows to manage errors before the memory
has started to be hotplugged. We already have
the function for the CPU cores.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
[dwg: Fixed a couple of style nits]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c | 41 ++++++++++++++++++++++++++---------------
 1 file changed, 26 insertions(+), 15 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index bcb0e18..3760d37 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2578,20 +2578,6 @@ static void spapr_memory_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
     uint64_t align = memory_region_get_alignment(mr);
     uint64_t size = memory_region_size(mr);
     uint64_t addr;
-    char *mem_dev;
-
-    if (size % SPAPR_MEMORY_BLOCK_SIZE) {
-        error_setg(&local_err, "Hotplugged memory size must be a multiple of "
-                      "%lld MB", SPAPR_MEMORY_BLOCK_SIZE/M_BYTE);
-        goto out;
-    }
-
-    mem_dev = object_property_get_str(OBJECT(dimm), PC_DIMM_MEMDEV_PROP, NULL);
-    if (mem_dev && !kvmppc_is_mem_backend_page_size_ok(mem_dev)) {
-        error_setg(&local_err, "Memory backend has bad page size. "
-                   "Use 'memory-backend-file' with correct mem-path.");
-        goto out;
-    }
 
     pc_dimm_memory_plug(dev, &ms->hotplug_memory, mr, align, &local_err);
     if (local_err) {
@@ -2612,6 +2598,29 @@ out:
     error_propagate(errp, local_err);
 }
 
+static void spapr_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
+                                  Error **errp)
+{
+    PCDIMMDevice *dimm = PC_DIMM(dev);
+    PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
+    MemoryRegion *mr = ddc->get_memory_region(dimm);
+    uint64_t size = memory_region_size(mr);
+    char *mem_dev;
+
+    if (size % SPAPR_MEMORY_BLOCK_SIZE) {
+        error_setg(errp, "Hotplugged memory size must be a multiple of "
+                      "%lld MB", SPAPR_MEMORY_BLOCK_SIZE / M_BYTE);
+        return;
+    }
+
+    mem_dev = object_property_get_str(OBJECT(dimm), PC_DIMM_MEMDEV_PROP, NULL);
+    if (mem_dev && !kvmppc_is_mem_backend_page_size_ok(mem_dev)) {
+        error_setg(errp, "Memory backend has bad page size. "
+                   "Use 'memory-backend-file' with correct mem-path.");
+        return;
+    }
+}
+
 typedef struct sPAPRDIMMState {
     uint32_t nr_lmbs;
 } sPAPRDIMMState;
@@ -3006,7 +3015,9 @@ static void spapr_machine_device_unplug_request(HotplugHandler *hotplug_dev,
 static void spapr_machine_device_pre_plug(HotplugHandler *hotplug_dev,
                                           DeviceState *dev, Error **errp)
 {
-    if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
+    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+        spapr_memory_pre_plug(hotplug_dev, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
         spapr_core_pre_plug(hotplug_dev, dev, errp);
     }
 }
-- 
2.9.4

Re: [Qemu-devel] [PULL 13/18] spapr: add pre_plug function for memory

[Peter Maydell]

On 25 May 2017 at 04:51, David Gibson <david@gibson.dropbear.id.au> wrote:
> From: Laurent Vivier <lvivier@redhat.com>
>
> This allows to manage errors before the memory
> has started to be hotplugged. We already have
> the function for the CPU cores.

> +static void spapr_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> +                                  Error **errp)
> +{
> +    PCDIMMDevice *dimm = PC_DIMM(dev);
> +    PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
> +    MemoryRegion *mr = ddc->get_memory_region(dimm);
> +    uint64_t size = memory_region_size(mr);
> +    char *mem_dev;
> +
> +    if (size % SPAPR_MEMORY_BLOCK_SIZE) {
> +        error_setg(errp, "Hotplugged memory size must be a multiple of "
> +                      "%lld MB", SPAPR_MEMORY_BLOCK_SIZE / M_BYTE);
> +        return;
> +    }
> +
> +    mem_dev = object_property_get_str(OBJECT(dimm), PC_DIMM_MEMDEV_PROP, NULL);
> +    if (mem_dev && !kvmppc_is_mem_backend_page_size_ok(mem_dev)) {
> +        error_setg(errp, "Memory backend has bad page size. "
> +                   "Use 'memory-backend-file' with correct mem-path.");
> +        return;
> +    }
> +}

Coverity points out that this leaks memory -- object_property_get_str()
returns a copy of a string which the caller is supposed to free, but
this code doesn't free it. (CID 1375942.)

thanks
-- PMM

Re: [Qemu-devel] [PULL 13/18] spapr: add pre_plug function for memory

[Greg Kurz]

[-- Attachment #1: Type: text/plain, Size: 1929 bytes --]

On Tue, 6 Jun 2017 16:00:32 +0100
Peter Maydell <peter.maydell@linaro.org> wrote:

> On 25 May 2017 at 04:51, David Gibson <david@gibson.dropbear.id.au> wrote:
> > From: Laurent Vivier <lvivier@redhat.com>
> >
> > This allows to manage errors before the memory
> > has started to be hotplugged. We already have
> > the function for the CPU cores.  
> 
> > +static void spapr_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> > +                                  Error **errp)
> > +{
> > +    PCDIMMDevice *dimm = PC_DIMM(dev);
> > +    PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
> > +    MemoryRegion *mr = ddc->get_memory_region(dimm);
> > +    uint64_t size = memory_region_size(mr);
> > +    char *mem_dev;
> > +
> > +    if (size % SPAPR_MEMORY_BLOCK_SIZE) {
> > +        error_setg(errp, "Hotplugged memory size must be a multiple of "
> > +                      "%lld MB", SPAPR_MEMORY_BLOCK_SIZE / M_BYTE);
> > +        return;
> > +    }
> > +
> > +    mem_dev = object_property_get_str(OBJECT(dimm), PC_DIMM_MEMDEV_PROP, NULL);
> > +    if (mem_dev && !kvmppc_is_mem_backend_page_size_ok(mem_dev)) {
> > +        error_setg(errp, "Memory backend has bad page size. "
> > +                   "Use 'memory-backend-file' with correct mem-path.");
> > +        return;
> > +    }
> > +}  
> 
> Coverity points out that this leaks memory -- object_property_get_str()
> returns a copy of a string which the caller is supposed to free, but
> this code doesn't free it. (CID 1375942.)
> 

Yeah, I've received the Coverity report as well. This is a regression introduced
in 2.9 by commit df58713396f8 ("hw/ppc/spapr: Check for valid page size when hot
plugging memory") actually.

The same commit also introduces a similar leak in
kvmppc_is_mem_backend_page_size_ok().

I'm about to send a series to fix both.

Cheers.

--
Greg

> thanks
> -- PMM
> 


[-- Attachment #2: OpenPGP digital signature --]
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[Qemu-devel] [PULL 14/18] hw/ppc/spapr.c: adding pending_dimm_unplugs to sPAPRMachineState

[David Gibson]

The LMB DRC release callback, spapr_lmb_release(), uses an opaque
parameter, a sPAPRDIMMState struct that stores the current LMBs that
are allocated to a DIMM (nr_lmbs). After each call to this callback,
the nr_lmbs is decremented by one and, when it reaches zero, the callback
proceeds with the qdev calls to hot unplug the LMB.

Using drc->detach_cb_opaque is problematic because it can't be migrated in
the future DRC migration work. This patch makes the following changes to
eliminate the usage of this opaque callback inside spapr_lmb_release:

- sPAPRDIMMState was moved from spapr.c and added to spapr.h. A new
attribute called 'addr' was added to it. This is used as an unique
identifier to associate a sPAPRDIMMState to a PCDIMM element.

- sPAPRMachineState now hosts a new QTAILQ called 'pending_dimm_unplugs'.
This queue of sPAPRDIMMState elements will store the DIMM state of DIMMs
that are currently going under an unplug process.

- spapr_lmb_release() will now retrieve the nr_lmbs value by getting the
correspondent sPAPRDIMMState. A helper function called spapr_dimm_get_address
was created to fetch the address of a PCDIMM device inside spapr_lmb_release.
When nr_lmbs reaches zero and the callback proceeds with the qdev hot unplug
calls, the sPAPRDIMMState struct is removed from spapr->pending_dimm_unplugs.

After these changes, the opaque argument for spapr_lmb_release is now
unused and is passed as NULL inside spapr_del_lmbs. This and the other
opaque arguments can now be safely removed from the code.

As an additional cleanup made by this patch, the spapr_del_lmbs function
was merged with spapr_memory_unplug_request. The former was being called
only by the latter and both were small enough to fit one single function.

Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
[dwg: Minor stylistic cleanups]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c         | 105 +++++++++++++++++++++++++++++++------------------
 include/hw/ppc/spapr.h |   6 +++
 2 files changed, 73 insertions(+), 38 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 3760d37..3a79dab 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2059,6 +2059,7 @@ static void ppc_spapr_init(MachineState *machine)
     msi_nonbroken = true;
 
     QLIST_INIT(&spapr->phbs);
+    QTAILQ_INIT(&spapr->pending_dimm_unplugs);
 
     /* Allocate RMA if necessary */
     rma_alloc_size = kvmppc_alloc_rma(&rma);
@@ -2621,58 +2622,58 @@ static void spapr_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
     }
 }
 
-typedef struct sPAPRDIMMState {
+struct sPAPRDIMMState {
+    PCDIMMDevice *dimm;
     uint32_t nr_lmbs;
-} sPAPRDIMMState;
+    QTAILQ_ENTRY(sPAPRDIMMState) next;
+};
+
+static sPAPRDIMMState *spapr_pending_dimm_unplugs_find(sPAPRMachineState *s,
+                                                       PCDIMMDevice *dimm)
+{
+    sPAPRDIMMState *dimm_state = NULL;
+
+    QTAILQ_FOREACH(dimm_state, &s->pending_dimm_unplugs, next) {
+        if (dimm_state->dimm == dimm) {
+            break;
+        }
+    }
+    return dimm_state;
+}
+
+static void spapr_pending_dimm_unplugs_add(sPAPRMachineState *spapr,
+                                           sPAPRDIMMState *dimm_state)
+{
+    g_assert(!spapr_pending_dimm_unplugs_find(spapr, dimm_state->dimm));
+    QTAILQ_INSERT_HEAD(&spapr->pending_dimm_unplugs, dimm_state, next);
+}
+
+static void spapr_pending_dimm_unplugs_remove(sPAPRMachineState *spapr,
+                                              sPAPRDIMMState *dimm_state)
+{
+    QTAILQ_REMOVE(&spapr->pending_dimm_unplugs, dimm_state, next);
+    g_free(dimm_state);
+}
 
 static void spapr_lmb_release(DeviceState *dev, void *opaque)
 {
-    sPAPRDIMMState *ds = (sPAPRDIMMState *)opaque;
-    HotplugHandler *hotplug_ctrl;
+    HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(dev);
+    sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_ctrl);
+    sPAPRDIMMState *ds = spapr_pending_dimm_unplugs_find(spapr, PC_DIMM(dev));
 
     if (--ds->nr_lmbs) {
         return;
     }
 
-    g_free(ds);
+    spapr_pending_dimm_unplugs_remove(spapr, ds);
 
     /*
      * Now that all the LMBs have been removed by the guest, call the
      * pc-dimm unplug handler to cleanup up the pc-dimm device.
      */
-    hotplug_ctrl = qdev_get_hotplug_handler(dev);
     hotplug_handler_unplug(hotplug_ctrl, dev, &error_abort);
 }
 
-static void spapr_del_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size,
-                           Error **errp)
-{
-    sPAPRDRConnector *drc;
-    sPAPRDRConnectorClass *drck;
-    uint32_t nr_lmbs = size / SPAPR_MEMORY_BLOCK_SIZE;
-    int i;
-    sPAPRDIMMState *ds = g_malloc0(sizeof(sPAPRDIMMState));
-    uint64_t addr = addr_start;
-
-    ds->nr_lmbs = nr_lmbs;
-    for (i = 0; i < nr_lmbs; i++) {
-        drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
-                addr / SPAPR_MEMORY_BLOCK_SIZE);
-        g_assert(drc);
-
-        drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
-        drck->detach(drc, dev, spapr_lmb_release, ds, errp);
-        addr += SPAPR_MEMORY_BLOCK_SIZE;
-    }
-
-    drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
-                                   addr_start / SPAPR_MEMORY_BLOCK_SIZE);
-    drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
-    spapr_hotplug_req_remove_by_count_indexed(SPAPR_DR_CONNECTOR_TYPE_LMB,
-                                              nr_lmbs,
-                                              drck->get_index(drc));
-}
-
 static void spapr_memory_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
                                 Error **errp)
 {
@@ -2688,19 +2689,47 @@ static void spapr_memory_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
 static void spapr_memory_unplug_request(HotplugHandler *hotplug_dev,
                                         DeviceState *dev, Error **errp)
 {
+    sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_dev);
     Error *local_err = NULL;
     PCDIMMDevice *dimm = PC_DIMM(dev);
     PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
     MemoryRegion *mr = ddc->get_memory_region(dimm);
     uint64_t size = memory_region_size(mr);
-    uint64_t addr;
+    uint32_t nr_lmbs = size / SPAPR_MEMORY_BLOCK_SIZE;
+    uint64_t addr_start, addr;
+    int i;
+    sPAPRDRConnector *drc;
+    sPAPRDRConnectorClass *drck;
+    sPAPRDIMMState *ds;
 
-    addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP, &local_err);
+    addr_start = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP,
+                                         &local_err);
     if (local_err) {
         goto out;
     }
 
-    spapr_del_lmbs(dev, addr, size, &error_abort);
+    ds = g_malloc0(sizeof(sPAPRDIMMState));
+    ds->nr_lmbs = nr_lmbs;
+    ds->dimm = dimm;
+    spapr_pending_dimm_unplugs_add(spapr, ds);
+
+    addr = addr_start;
+    for (i = 0; i < nr_lmbs; i++) {
+        drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
+                addr / SPAPR_MEMORY_BLOCK_SIZE);
+        g_assert(drc);
+
+        drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
+        drck->detach(drc, dev, spapr_lmb_release, NULL, errp);
+        addr += SPAPR_MEMORY_BLOCK_SIZE;
+    }
+
+    drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
+                                   addr_start / SPAPR_MEMORY_BLOCK_SIZE);
+    drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
+    spapr_hotplug_req_remove_by_count_indexed(SPAPR_DR_CONNECTOR_TYPE_LMB,
+                                              nr_lmbs,
+                                              drck->get_index(drc));
 out:
     error_propagate(errp, local_err);
 }
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 8f424ca..777b5de 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -32,6 +32,7 @@ struct sPAPRRTCState {
     int64_t ns_offset;
 };
 
+typedef struct sPAPRDIMMState sPAPRDIMMState;
 typedef struct sPAPRMachineClass sPAPRMachineClass;
 
 #define TYPE_SPAPR_MACHINE      "spapr-machine"
@@ -104,6 +105,11 @@ struct sPAPRMachineState {
     /* RTAS state */
     QTAILQ_HEAD(, sPAPRConfigureConnectorState) ccs_list;
 
+    /* Pending DIMM unplug cache. It is populated when a LMB
+     * unplug starts. It can be regenerated if a migration
+     * occurs during the unplug process. */
+    QTAILQ_HEAD(, sPAPRDIMMState) pending_dimm_unplugs;
+
     /*< public >*/
     char *kvm_type;
     MemoryHotplugState hotplug_memory;
-- 
2.9.4

[Qemu-devel] [PULL 15/18] hw/ppc: removing drc->detach_cb and drc->detach_cb_opaque

[David Gibson]

From: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>

The pointer drc->detach_cb is being used as a way of informing
the detach() function inside spapr_drc.c which cb to execute. This
information can also be retrieved simply by checking drc->type and
choosing the right callback based on it. In this context, detach_cb
is redundant information that must be managed.

After the previous spapr_lmb_release change, no detach_cb_opaques
are being used by any of the three callbacks functions. This is
yet another information that is now unused and, on top of that, can't
be migrated either.

This patch makes the following changes:

- removal of detach_cb_opaque. the 'opaque' argument was removed from
the callbacks and from the detach() function of sPAPRConnectorClass. The
attribute detach_cb_opaque of sPAPRConnector was removed.

- removal of detach_cb from the detach() call. The function pointer
detach_cb of sPAPRConnector was removed. detach() now uses a
switch(drc->type) to execute the apropriate callback. To achieve this,
spapr_core_release, spapr_lmb_release and spapr_phb_remove_pci_device_cb
callbacks were made public to be visible inside detach().

Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c              | 10 ++++++----
 hw/ppc/spapr_drc.c          | 36 ++++++++++++++++++++----------------
 hw/ppc/spapr_pci.c          |  5 +++--
 include/hw/pci-host/spapr.h |  3 +++
 include/hw/ppc/spapr.h      |  4 ++++
 include/hw/ppc/spapr_drc.h  |  8 +-------
 6 files changed, 37 insertions(+), 29 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 3a79dab..14399f4 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2655,7 +2655,8 @@ static void spapr_pending_dimm_unplugs_remove(sPAPRMachineState *spapr,
     g_free(dimm_state);
 }
 
-static void spapr_lmb_release(DeviceState *dev, void *opaque)
+/* Callback to be called during DRC release. */
+void spapr_lmb_release(DeviceState *dev)
 {
     HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(dev);
     sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_ctrl);
@@ -2720,7 +2721,7 @@ static void spapr_memory_unplug_request(HotplugHandler *hotplug_dev,
         g_assert(drc);
 
         drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
-        drck->detach(drc, dev, spapr_lmb_release, NULL, errp);
+        drck->detach(drc, dev, errp);
         addr += SPAPR_MEMORY_BLOCK_SIZE;
     }
 
@@ -2767,7 +2768,8 @@ static void spapr_core_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
     object_unparent(OBJECT(dev));
 }
 
-static void spapr_core_release(DeviceState *dev, void *opaque)
+/* Callback to be called during DRC release. */
+void spapr_core_release(DeviceState *dev)
 {
     HotplugHandler *hotplug_ctrl;
 
@@ -2800,7 +2802,7 @@ void spapr_core_unplug_request(HotplugHandler *hotplug_dev, DeviceState *dev,
     g_assert(drc);
 
     drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
-    drck->detach(drc, dev, spapr_core_release, NULL, &local_err);
+    drck->detach(drc, dev, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index 9fa5545..2851e16 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -20,6 +20,7 @@
 #include "qapi/visitor.h"
 #include "qemu/error-report.h"
 #include "hw/ppc/spapr.h" /* for RTAS return codes */
+#include "hw/pci-host/spapr.h" /* spapr_phb_remove_pci_device_cb callback */
 #include "trace.h"
 
 #define DRC_CONTAINER_PATH "/dr-connector"
@@ -99,8 +100,7 @@ static uint32_t set_isolation_state(sPAPRDRConnector *drc,
         if (drc->awaiting_release) {
             if (drc->configured) {
                 trace_spapr_drc_set_isolation_state_finalizing(get_index(drc));
-                drck->detach(drc, DEVICE(drc->dev), drc->detach_cb,
-                             drc->detach_cb_opaque, NULL);
+                drck->detach(drc, DEVICE(drc->dev), NULL);
             } else {
                 trace_spapr_drc_set_isolation_state_deferring(get_index(drc));
             }
@@ -153,8 +153,7 @@ static uint32_t set_allocation_state(sPAPRDRConnector *drc,
         if (drc->awaiting_release &&
             drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_UNUSABLE) {
             trace_spapr_drc_set_allocation_state_finalizing(get_index(drc));
-            drck->detach(drc, DEVICE(drc->dev), drc->detach_cb,
-                         drc->detach_cb_opaque, NULL);
+            drck->detach(drc, DEVICE(drc->dev), NULL);
         } else if (drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_USABLE) {
             drc->awaiting_allocation = false;
         }
@@ -404,15 +403,10 @@ static void attach(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
                              NULL, 0, NULL);
 }
 
-static void detach(sPAPRDRConnector *drc, DeviceState *d,
-                   spapr_drc_detach_cb *detach_cb,
-                   void *detach_cb_opaque, Error **errp)
+static void detach(sPAPRDRConnector *drc, DeviceState *d, Error **errp)
 {
     trace_spapr_drc_detach(get_index(drc));
 
-    drc->detach_cb = detach_cb;
-    drc->detach_cb_opaque = detach_cb_opaque;
-
     /* if we've signalled device presence to the guest, or if the guest
      * has gone ahead and configured the device (via manually-executed
      * device add via drmgr in guest, namely), we need to wait
@@ -456,8 +450,21 @@ static void detach(sPAPRDRConnector *drc, DeviceState *d,
 
     drc->indicator_state = SPAPR_DR_INDICATOR_STATE_INACTIVE;
 
-    if (drc->detach_cb) {
-        drc->detach_cb(drc->dev, drc->detach_cb_opaque);
+    /* Calling release callbacks based on drc->type. */
+    switch (drc->type) {
+    case SPAPR_DR_CONNECTOR_TYPE_CPU:
+        spapr_core_release(drc->dev);
+        break;
+    case SPAPR_DR_CONNECTOR_TYPE_PCI:
+        spapr_phb_remove_pci_device_cb(drc->dev);
+        break;
+    case SPAPR_DR_CONNECTOR_TYPE_LMB:
+        spapr_lmb_release(drc->dev);
+        break;
+    case SPAPR_DR_CONNECTOR_TYPE_PHB:
+    case SPAPR_DR_CONNECTOR_TYPE_VIO:
+    default:
+        g_assert(false);
     }
 
     drc->awaiting_release = false;
@@ -467,8 +474,6 @@ static void detach(sPAPRDRConnector *drc, DeviceState *d,
     drc->fdt_start_offset = 0;
     object_property_del(OBJECT(drc), "device", NULL);
     drc->dev = NULL;
-    drc->detach_cb = NULL;
-    drc->detach_cb_opaque = NULL;
 }
 
 static bool release_pending(sPAPRDRConnector *drc)
@@ -498,8 +503,7 @@ static void reset(DeviceState *d)
          * force removal if we are
          */
         if (drc->awaiting_release) {
-            drck->detach(drc, DEVICE(drc->dev), drc->detach_cb,
-                         drc->detach_cb_opaque, NULL);
+            drck->detach(drc, DEVICE(drc->dev), NULL);
         }
 
         /* non-PCI devices may be awaiting a transition to UNUSABLE */
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index a7cff32..e4daf8d 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -1369,7 +1369,8 @@ out:
     }
 }
 
-static void spapr_phb_remove_pci_device_cb(DeviceState *dev, void *opaque)
+/* Callback to be called during DRC release. */
+void spapr_phb_remove_pci_device_cb(DeviceState *dev)
 {
     /* some version guests do not wait for completion of a device
      * cleanup (generally done asynchronously by the kernel) before
@@ -1392,7 +1393,7 @@ static void spapr_phb_remove_pci_device(sPAPRDRConnector *drc,
 {
     sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
 
-    drck->detach(drc, DEVICE(pdev), spapr_phb_remove_pci_device_cb, phb, errp);
+    drck->detach(drc, DEVICE(pdev), errp);
 }
 
 static sPAPRDRConnector *spapr_phb_get_pci_func_drc(sPAPRPHBState *phb,
diff --git a/include/hw/pci-host/spapr.h b/include/hw/pci-host/spapr.h
index 1c2e970..38470b2 100644
--- a/include/hw/pci-host/spapr.h
+++ b/include/hw/pci-host/spapr.h
@@ -123,6 +123,9 @@ sPAPRPHBState *spapr_pci_find_phb(sPAPRMachineState *spapr, uint64_t buid);
 PCIDevice *spapr_pci_find_dev(sPAPRMachineState *spapr, uint64_t buid,
                               uint32_t config_addr);
 
+/* PCI release callback. */
+void spapr_phb_remove_pci_device_cb(DeviceState *dev);
+
 /* VFIO EEH hooks */
 #ifdef CONFIG_LINUX
 bool spapr_phb_eeh_available(sPAPRPHBState *sphb);
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 777b5de..98fb78b 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -642,6 +642,10 @@ void spapr_hotplug_req_remove_by_count_indexed(sPAPRDRConnectorType drc_type,
 void *spapr_populate_hotplug_cpu_dt(CPUState *cs, int *fdt_offset,
                                     sPAPRMachineState *spapr);
 
+/* CPU and LMB DRC release callbacks. */
+void spapr_core_release(DeviceState *dev);
+void spapr_lmb_release(DeviceState *dev);
+
 /* rtas-configure-connector state */
 struct sPAPRConfigureConnectorState {
     uint32_t drc_index;
diff --git a/include/hw/ppc/spapr_drc.h b/include/hw/ppc/spapr_drc.h
index 5524247..813b9ff 100644
--- a/include/hw/ppc/spapr_drc.h
+++ b/include/hw/ppc/spapr_drc.h
@@ -130,8 +130,6 @@ typedef enum {
     SPAPR_DR_CC_RESPONSE_NOT_CONFIGURABLE = -9003,
 } sPAPRDRCCResponse;
 
-typedef void (spapr_drc_detach_cb)(DeviceState *d, void *opaque);
-
 typedef struct sPAPRDRConnector {
     /*< private >*/
     DeviceState parent;
@@ -158,8 +156,6 @@ typedef struct sPAPRDRConnector {
 
     /* device pointer, via link property */
     DeviceState *dev;
-    spapr_drc_detach_cb *detach_cb;
-    void *detach_cb_opaque;
 } sPAPRDRConnector;
 
 typedef struct sPAPRDRConnectorClass {
@@ -188,9 +184,7 @@ typedef struct sPAPRDRConnectorClass {
     /* QEMU interfaces for managing hotplug operations */
     void (*attach)(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
                    int fdt_start_offset, bool coldplug, Error **errp);
-    void (*detach)(sPAPRDRConnector *drc, DeviceState *d,
-                   spapr_drc_detach_cb *detach_cb,
-                   void *detach_cb_opaque, Error **errp);
+    void (*detach)(sPAPRDRConnector *drc, DeviceState *d, Error **errp);
     bool (*release_pending)(sPAPRDRConnector *drc);
     void (*set_signalled)(sPAPRDRConnector *drc);
 } sPAPRDRConnectorClass;
-- 
2.9.4

[Qemu-devel] [PULL 16/18] hw/ppc: migrating the DRC state of hotplugged devices

[David Gibson]

From: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>

In pseries, a firmware abstraction called Dynamic Reconfiguration
Connector (DRC) is used to assign a particular dynamic resource
to the guest and provide an interface to manage configuration/removal
of the resource associated with it. In other words, DRC is the
'plugged state' of a device.

Before this patch, DRC wasn't being migrated. This causes
post-migration problems due to DRC state mismatch between source and
target. The DRC state of a device X in the source might
change, while in the target the DRC state of X is still fresh. When
migrating the guest, X will not have the same hotplugged state as it
did in the source. This means that we can't hot unplug X in the
target after migration is completed because its DRC state is not consistent.
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1677552 is one
bug that is caused by this DRC state mismatch between source and
target.

To migrate the DRC state, we defined the VMStateDescription struct for
spapr_drc to enable the transmission of spapr_drc state in migration.
Not all the elements in the DRC state are migrated - only those
that can be modified by guest actions or device add/remove
operations:

- 'isolation_state', 'allocation_state' and 'indicator_state'
are involved in the DR state transition diagram from
PAPR+ 2.7, 13.4;

- 'configured', 'signalled', 'awaiting_release' and 'awaiting_allocation'
are needed in attaching and detaching devices;

- 'indicator_state' provides users with hardware state information.

These are the DRC elements that are migrated.

In this patch the DRC state is migrated for PCI, LMB and CPU
connector types. At this moment there is no support to migrate
DRC for the PHB (PCI Host Bridge) type.

In the 'realize' function the DRC is registered using vmstate_register,
similar to what hw/ppc/spapr_iommu.c does in 'spapr_tce_table_realize'.
This approach works because  DRCs are bus-less and do not sit
on a BusClass that implements bc->get_dev_path, so as a fallback the
VMSD gets identified via "spapr_drc"/get_index(drc).

Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr_drc.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index 2851e16..cc2400b 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -519,6 +519,60 @@ static void reset(DeviceState *d)
     }
 }
 
+static bool spapr_drc_needed(void *opaque)
+{
+    sPAPRDRConnector *drc = (sPAPRDRConnector *)opaque;
+    sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
+    bool rc = false;
+    sPAPRDREntitySense value;
+    drck->entity_sense(drc, &value);
+
+    /* If no dev is plugged in there is no need to migrate the DRC state */
+    if (value != SPAPR_DR_ENTITY_SENSE_PRESENT) {
+        return false;
+    }
+
+    /*
+     * If there is dev plugged in, we need to migrate the DRC state when
+     * it is different from cold-plugged state
+     */
+    switch (drc->type) {
+    case SPAPR_DR_CONNECTOR_TYPE_PCI:
+        rc = !((drc->isolation_state == SPAPR_DR_ISOLATION_STATE_UNISOLATED) &&
+               (drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_USABLE) &&
+               drc->configured && drc->signalled && !drc->awaiting_release);
+        break;
+    case SPAPR_DR_CONNECTOR_TYPE_CPU:
+    case SPAPR_DR_CONNECTOR_TYPE_LMB:
+        rc = !((drc->isolation_state == SPAPR_DR_ISOLATION_STATE_ISOLATED) &&
+               (drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_UNUSABLE) &&
+               drc->configured && drc->signalled && !drc->awaiting_release);
+        break;
+    case SPAPR_DR_CONNECTOR_TYPE_PHB:
+    case SPAPR_DR_CONNECTOR_TYPE_VIO:
+    default:
+        g_assert(false);
+    }
+    return rc;
+}
+
+static const VMStateDescription vmstate_spapr_drc = {
+    .name = "spapr_drc",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = spapr_drc_needed,
+    .fields  = (VMStateField []) {
+        VMSTATE_UINT32(isolation_state, sPAPRDRConnector),
+        VMSTATE_UINT32(allocation_state, sPAPRDRConnector),
+        VMSTATE_UINT32(indicator_state, sPAPRDRConnector),
+        VMSTATE_BOOL(configured, sPAPRDRConnector),
+        VMSTATE_BOOL(awaiting_release, sPAPRDRConnector),
+        VMSTATE_BOOL(awaiting_allocation, sPAPRDRConnector),
+        VMSTATE_BOOL(signalled, sPAPRDRConnector),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static void realize(DeviceState *d, Error **errp)
 {
     sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(d);
@@ -547,6 +601,8 @@ static void realize(DeviceState *d, Error **errp)
         object_unref(OBJECT(drc));
     }
     g_free(child_name);
+    vmstate_register(DEVICE(drc), drck->get_index(drc), &vmstate_spapr_drc,
+                     drc);
     trace_spapr_drc_realize_complete(drck->get_index(drc));
 }
 
-- 
2.9.4

[Qemu-devel] [PULL 17/18] hw/ppc/spapr.c: recover pending LMB unplug info in spapr_lmb_release

[David Gibson]

From: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>

When a LMB hot unplug starts, the current DRC LMB status is stored at
spapr->pending_dimm_unplugs QTAILQ. This queue isn't migrated, thus
if a migration occurs in the middle of a LMB unplug the
spapr_lmb_release callback will lost track of the LMB unplug progress.

This patch implements a new recover function spapr_recover_pending_dimm_state
that is used inside spapr_lmb_release to recover this DRC LMB release
status that is lost during the migration.

Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
[dwg: Minor stylistic changes, simplify error handling]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 14399f4..ab3aab1 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2655,6 +2655,40 @@ static void spapr_pending_dimm_unplugs_remove(sPAPRMachineState *spapr,
     g_free(dimm_state);
 }
 
+static sPAPRDIMMState *spapr_recover_pending_dimm_state(sPAPRMachineState *ms,
+                                                        PCDIMMDevice *dimm)
+{
+    sPAPRDRConnector *drc;
+    PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
+    MemoryRegion *mr = ddc->get_memory_region(dimm);
+    uint64_t size = memory_region_size(mr);
+    uint32_t nr_lmbs = size / SPAPR_MEMORY_BLOCK_SIZE;
+    uint32_t avail_lmbs = 0;
+    uint64_t addr_start, addr;
+    int i;
+    sPAPRDIMMState *ds;
+
+    addr_start = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP,
+                                         &error_abort);
+
+    addr = addr_start;
+    for (i = 0; i < nr_lmbs; i++) {
+        drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
+                                       addr / SPAPR_MEMORY_BLOCK_SIZE);
+        g_assert(drc);
+        if (drc->indicator_state != SPAPR_DR_INDICATOR_STATE_INACTIVE) {
+            avail_lmbs++;
+        }
+        addr += SPAPR_MEMORY_BLOCK_SIZE;
+    }
+
+    ds = g_malloc0(sizeof(sPAPRDIMMState));
+    ds->nr_lmbs = avail_lmbs;
+    ds->dimm = dimm;
+    spapr_pending_dimm_unplugs_add(ms, ds);
+    return ds;
+}
+
 /* Callback to be called during DRC release. */
 void spapr_lmb_release(DeviceState *dev)
 {
@@ -2662,7 +2696,14 @@ void spapr_lmb_release(DeviceState *dev)
     sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_ctrl);
     sPAPRDIMMState *ds = spapr_pending_dimm_unplugs_find(spapr, PC_DIMM(dev));
 
-    if (--ds->nr_lmbs) {
+    /* This information will get lost if a migration occurs
+     * during the unplug process. In this case recover it. */
+    if (ds == NULL) {
+        ds = spapr_recover_pending_dimm_state(spapr, PC_DIMM(dev));
+        if (ds->nr_lmbs) {
+            return;
+        }
+    } else if (--ds->nr_lmbs) {
         return;
     }
 
-- 
2.9.4

[Qemu-devel] [PULL 18/18] xics: add unrealize handler

[David Gibson]

From: Greg Kurz <groug@kaod.org>

Now that ICPState objects get finalized on CPU unplug, we should unregister
reset handlers as well to avoid a QEMU crash at machine reset time.

Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/intc/xics.c     | 5 +++++
 hw/intc/xics_kvm.c | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/hw/intc/xics.c b/hw/intc/xics.c
index 292fffe..ea35167 100644
--- a/hw/intc/xics.c
+++ b/hw/intc/xics.c
@@ -357,6 +357,10 @@ static void icp_realize(DeviceState *dev, Error **errp)
     qemu_register_reset(icp_reset, dev);
 }
 
+static void icp_unrealize(DeviceState *dev, Error **errp)
+{
+    qemu_unregister_reset(icp_reset, dev);
+}
 
 static void icp_class_init(ObjectClass *klass, void *data)
 {
@@ -364,6 +368,7 @@ static void icp_class_init(ObjectClass *klass, void *data)
 
     dc->vmsd = &vmstate_icp_server;
     dc->realize = icp_realize;
+    dc->unrealize = icp_unrealize;
 }
 
 static const TypeInfo icp_info = {
diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
index dd7f298..14b8f6f 100644
--- a/hw/intc/xics_kvm.c
+++ b/hw/intc/xics_kvm.c
@@ -164,12 +164,18 @@ static void icp_kvm_realize(DeviceState *dev, Error **errp)
     qemu_register_reset(icp_kvm_reset, dev);
 }
 
+static void icp_kvm_unrealize(DeviceState *dev, Error **errp)
+{
+    qemu_unregister_reset(icp_kvm_reset, dev);
+}
+
 static void icp_kvm_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     ICPStateClass *icpc = ICP_CLASS(klass);
 
     dc->realize = icp_kvm_realize;
+    dc->unrealize = icp_kvm_unrealize;
     icpc->pre_save = icp_get_kvm_state;
     icpc->post_load = icp_set_kvm_state;
     icpc->cpu_setup = icp_kvm_cpu_setup;
-- 
2.9.4

Re: [Qemu-devel] [PULL 00/18] ppc-for-2.10 queue 20170525

[Stefan Hajnoczi]

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On Thu, May 25, 2017 at 01:51:14PM +1000, David Gibson wrote:
> The following changes since commit 9964e96dc9999cf7f7c936ee854a795415d19b60:
> 
>   Merge remote-tracking branch 'jasowang/tags/net-pull-request' into staging (2017-05-23 15:01:31 +0100)
> 
> are available in the git repository at:
> 
>   git://github.com/dgibson/qemu.git tags/ppc-for-2.10-20170525
> 
> for you to fetch changes up to 62f94fc94f98095173146e753a1f03d7c2cc7ba3:
> 
>   xics: add unrealize handler (2017-05-25 11:31:33 +1000)
> 
> ----------------------------------------------------------------
> ppc patch queue 2017-05-25
> 
> Assorted accumulated patches.  These are nearly all bugfixes at one
> level or another - some for longstanding problems, others for some
> regressions caused by more recent cleanups.
> 
> This includes preliminary patches towards fixing migration for Radix
> Page Table guests under POWER9 and also fixing some migration
> regressions due to the re-organization of the interrupt controller
> code.  Not all the pieces are there yet, so those still won't quite
> work, but the preliminary changes make sense on their own.
> 
> ----------------------------------------------------------------
> Bharata B Rao (1):
>       spapr: Consolidate HPT freeing code into a routine
> 
> Daniel Henrique Barboza (4):
>       hw/ppc/spapr_events.c: removing 'exception' from sPAPREventLogEntry
>       hw/ppc: removing drc->detach_cb and drc->detach_cb_opaque
>       hw/ppc: migrating the DRC state of hotplugged devices
>       hw/ppc/spapr.c: recover pending LMB unplug info in spapr_lmb_release
> 
> David Gibson (3):
>       pseries: Split CAS PVR negotiation out into a separate function
>       pseries: Restore support for total vcpus not a multiple of threads-per-core for old machine types
>       hw/ppc/spapr.c: adding pending_dimm_unplugs to sPAPRMachineState
> 
> Greg Kurz (8):
>       ppc/xics: simplify prototype of xics_spapr_init()
>       spapr: sanitize error handling in spapr_ics_create()
>       spapr-cpu-core: release ICP object when realization fails
>       xics_kvm: cache already enabled vCPU ids
>       spapr: ensure core_slot isn't NULL in spapr_core_unplug()
>       spapr_cpu_core: drop reference on ICP object during CPU realization
>       spapr: fix error reporting in xics_system_init()
>       xics: add unrealize handler
> 
> Laurent Vivier (1):
>       spapr: add pre_plug function for memory
> 
> Nikunj A Dadhania (1):
>       target/ppc: reset reservation in do_rfi()
> 
>  hw/intc/xics.c              |   5 +
>  hw/intc/xics_kvm.c          |  33 ++++--
>  hw/intc/xics_spapr.c        |   3 +-
>  hw/ppc/spapr.c              | 239 +++++++++++++++++++++++++++++++-------------
>  hw/ppc/spapr_cpu_core.c     |  19 ++--
>  hw/ppc/spapr_drc.c          |  92 ++++++++++++++---
>  hw/ppc/spapr_events.c       |  52 ++--------
>  hw/ppc/spapr_hcall.c        |  54 ++++++----
>  hw/ppc/spapr_pci.c          |   5 +-
>  include/hw/pci-host/spapr.h |   3 +
>  include/hw/ppc/spapr.h      |  12 ++-
>  include/hw/ppc/spapr_drc.h  |   8 +-
>  include/hw/ppc/xics.h       |   3 +-
>  target/ppc/excp_helper.c    |   3 +
>  14 files changed, 349 insertions(+), 182 deletions(-)
> 

Thanks, applied to my staging tree:
https://github.com/stefanha/qemu/commits/staging

Stefan

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