* [PATCH v4 0/6] hyperv: VMBus implementation
@ 2020-04-24 12:34 Jon Doron
2020-04-24 12:34 ` [PATCH v4 1/6] hyperv: expose API to determine if synic is enabled Jon Doron
` (6 more replies)
0 siblings, 7 replies; 31+ messages in thread
From: Jon Doron @ 2020-04-24 12:34 UTC (permalink / raw)
To: qemu-devel
Cc: mail, eyakovlev, ehabkost, rvkagan, liran.alon, pbonzini,
vkuznets, Jon Doron
This is a rebase of the old patchset from Roman for HyperV VMBus
implementation.
How to use:
-device vmbus-bridge
Later on new paravirtualized devices can be implemented on top of it
(Network/SCSI/etc.)
VMBus is a collection of technologies. At its lowest layer, it's a message
passing and signaling mechanism, allowing efficient passing of messages to and
from guest VMs. A layer higher, it's a mechanism for defining channels of
communication, where each channel is tagged with a type (which implies a
protocol) and a instance ID. A layer higher than that, it's a bus driver,
serving as the basis of device enumeration within a VM, where a channel can
optionally be exposed as a paravirtual device. When a server-side (paravirtual
back-end) component wishes to offer a channel to a guest VM, it does so by
specifying a channel type, a mode, and an instance ID. VMBus then exposes this
in the guest.
More information about VMBus can be found in the file
vmbuskernelmodeclientlibapi.h in Microsoft's WDK.
v4:
Decided to ditch the patch that envolves handling of EOM as there is
still a discussion going on with it in the KVM mailing list.
v3:
Fixed an error asan
v2:
Rebased on top of latest patchset from Roman and Maciej
Jon Doron (6):
hyperv: expose API to determine if synic is enabled
vmbus: add vmbus protocol definitions
vmbus: vmbus implementation
i386:pc: whitelist dynamic vmbus-bridge
i386: Hyper-V VMBus ACPI DSDT entry
vmbus: add infrastructure to save/load vmbus requests
Makefile.objs | 1 +
hw/hyperv/Kconfig | 5 +
hw/hyperv/Makefile.objs | 1 +
hw/hyperv/hyperv.c | 8 +
hw/hyperv/trace-events | 18 +
hw/hyperv/vmbus.c | 2778 ++++++++++++++++++++++++++++++
hw/i386/acpi-build.c | 43 +
hw/i386/pc_piix.c | 2 +
hw/i386/pc_q35.c | 2 +
include/hw/hyperv/hyperv.h | 1 +
include/hw/hyperv/vmbus-bridge.h | 35 +
include/hw/hyperv/vmbus-proto.h | 222 +++
include/hw/hyperv/vmbus.h | 230 +++
13 files changed, 3346 insertions(+)
create mode 100644 hw/hyperv/trace-events
create mode 100644 hw/hyperv/vmbus.c
create mode 100644 include/hw/hyperv/vmbus-bridge.h
create mode 100644 include/hw/hyperv/vmbus-proto.h
create mode 100644 include/hw/hyperv/vmbus.h
--
2.24.1
^ permalink raw reply [flat|nested] 31+ messages in thread
* [PATCH v4 1/6] hyperv: expose API to determine if synic is enabled
2020-04-24 12:34 [PATCH v4 0/6] hyperv: VMBus implementation Jon Doron
@ 2020-04-24 12:34 ` Jon Doron
2020-04-24 12:34 ` [PATCH v4 2/6] vmbus: add vmbus protocol definitions Jon Doron
` (5 subsequent siblings)
6 siblings, 0 replies; 31+ messages in thread
From: Jon Doron @ 2020-04-24 12:34 UTC (permalink / raw)
To: qemu-devel
Cc: mail, eyakovlev, ehabkost, rvkagan, liran.alon, pbonzini,
vkuznets, Jon Doron
Signed-off-by: Jon Doron <arilou@gmail.com>
---
hw/hyperv/hyperv.c | 8 ++++++++
include/hw/hyperv/hyperv.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/hw/hyperv/hyperv.c b/hw/hyperv/hyperv.c
index 8ca3706f5b..ddf4f32c60 100644
--- a/hw/hyperv/hyperv.c
+++ b/hw/hyperv/hyperv.c
@@ -37,6 +37,13 @@ typedef struct SynICState {
#define TYPE_SYNIC "hyperv-synic"
#define SYNIC(obj) OBJECT_CHECK(SynICState, (obj), TYPE_SYNIC)
+static bool synic_enabled;
+
+bool hyperv_is_synic_enabled(void)
+{
+ return synic_enabled;
+}
+
static SynICState *get_synic(CPUState *cs)
{
return SYNIC(object_resolve_path_component(OBJECT(cs), "synic"));
@@ -133,6 +140,7 @@ void hyperv_synic_add(CPUState *cs)
object_property_add_child(OBJECT(cs), "synic", obj, &error_abort);
object_unref(obj);
object_property_set_bool(obj, true, "realized", &error_abort);
+ synic_enabled = true;
}
void hyperv_synic_reset(CPUState *cs)
diff --git a/include/hw/hyperv/hyperv.h b/include/hw/hyperv/hyperv.h
index 597381cb01..a63ee0003c 100644
--- a/include/hw/hyperv/hyperv.h
+++ b/include/hw/hyperv/hyperv.h
@@ -79,5 +79,6 @@ void hyperv_synic_add(CPUState *cs);
void hyperv_synic_reset(CPUState *cs);
void hyperv_synic_update(CPUState *cs, bool enable,
hwaddr msg_page_addr, hwaddr event_page_addr);
+bool hyperv_is_synic_enabled(void);
#endif
--
2.24.1
^ permalink raw reply related [flat|nested] 31+ messages in thread
* [PATCH v4 2/6] vmbus: add vmbus protocol definitions
2020-04-24 12:34 [PATCH v4 0/6] hyperv: VMBus implementation Jon Doron
2020-04-24 12:34 ` [PATCH v4 1/6] hyperv: expose API to determine if synic is enabled Jon Doron
@ 2020-04-24 12:34 ` Jon Doron
2020-04-24 12:34 ` [PATCH v4 3/6] vmbus: vmbus implementation Jon Doron
` (4 subsequent siblings)
6 siblings, 0 replies; 31+ messages in thread
From: Jon Doron @ 2020-04-24 12:34 UTC (permalink / raw)
To: qemu-devel
Cc: mail, eyakovlev, ehabkost, rvkagan, liran.alon, Roman Kagan,
pbonzini, vkuznets, Maciej S . Szmigiero, Jon Doron
Add a header with data structures and constants used in Hyper-V VMBus
hypervisor <-> guest interactions.
Based on the respective stuff from Linux kernel.
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Signed-off-by: Jon Doron <arilou@gmail.com>
---
include/hw/hyperv/vmbus-proto.h | 222 ++++++++++++++++++++++++++++++++
1 file changed, 222 insertions(+)
create mode 100644 include/hw/hyperv/vmbus-proto.h
diff --git a/include/hw/hyperv/vmbus-proto.h b/include/hw/hyperv/vmbus-proto.h
new file mode 100644
index 0000000000..4628d3b323
--- /dev/null
+++ b/include/hw/hyperv/vmbus-proto.h
@@ -0,0 +1,222 @@
+/*
+ * QEMU Hyper-V VMBus support
+ *
+ * Copyright (c) 2017-2018 Virtuozzo International GmbH.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_HYPERV_VMBUS_PROTO_H
+#define HW_HYPERV_VMBUS_PROTO_H
+
+#define VMBUS_VERSION_WS2008 ((0 << 16) | (13))
+#define VMBUS_VERSION_WIN7 ((1 << 16) | (1))
+#define VMBUS_VERSION_WIN8 ((2 << 16) | (4))
+#define VMBUS_VERSION_WIN8_1 ((3 << 16) | (0))
+#define VMBUS_VERSION_WIN10 ((4 << 16) | (0))
+#define VMBUS_VERSION_INVAL -1
+#define VMBUS_VERSION_CURRENT VMBUS_VERSION_WIN10
+
+#define VMBUS_MESSAGE_CONNECTION_ID 1
+#define VMBUS_EVENT_CONNECTION_ID 2
+#define VMBUS_MONITOR_CONNECTION_ID 3
+#define VMBUS_SINT 2
+
+#define VMBUS_MSG_INVALID 0
+#define VMBUS_MSG_OFFERCHANNEL 1
+#define VMBUS_MSG_RESCIND_CHANNELOFFER 2
+#define VMBUS_MSG_REQUESTOFFERS 3
+#define VMBUS_MSG_ALLOFFERS_DELIVERED 4
+#define VMBUS_MSG_OPENCHANNEL 5
+#define VMBUS_MSG_OPENCHANNEL_RESULT 6
+#define VMBUS_MSG_CLOSECHANNEL 7
+#define VMBUS_MSG_GPADL_HEADER 8
+#define VMBUS_MSG_GPADL_BODY 9
+#define VMBUS_MSG_GPADL_CREATED 10
+#define VMBUS_MSG_GPADL_TEARDOWN 11
+#define VMBUS_MSG_GPADL_TORNDOWN 12
+#define VMBUS_MSG_RELID_RELEASED 13
+#define VMBUS_MSG_INITIATE_CONTACT 14
+#define VMBUS_MSG_VERSION_RESPONSE 15
+#define VMBUS_MSG_UNLOAD 16
+#define VMBUS_MSG_UNLOAD_RESPONSE 17
+#define VMBUS_MSG_COUNT 18
+
+#define VMBUS_MESSAGE_SIZE_ALIGN sizeof(uint64_t)
+
+#define VMBUS_PACKET_INVALID 0x0
+#define VMBUS_PACKET_SYNCH 0x1
+#define VMBUS_PACKET_ADD_XFER_PAGESET 0x2
+#define VMBUS_PACKET_RM_XFER_PAGESET 0x3
+#define VMBUS_PACKET_ESTABLISH_GPADL 0x4
+#define VMBUS_PACKET_TEARDOWN_GPADL 0x5
+#define VMBUS_PACKET_DATA_INBAND 0x6
+#define VMBUS_PACKET_DATA_USING_XFER_PAGES 0x7
+#define VMBUS_PACKET_DATA_USING_GPADL 0x8
+#define VMBUS_PACKET_DATA_USING_GPA_DIRECT 0x9
+#define VMBUS_PACKET_CANCEL_REQUEST 0xa
+#define VMBUS_PACKET_COMP 0xb
+#define VMBUS_PACKET_DATA_USING_ADDITIONAL_PKT 0xc
+#define VMBUS_PACKET_ADDITIONAL_DATA 0xd
+
+#define VMBUS_CHANNEL_USER_DATA_SIZE 120
+
+#define VMBUS_OFFER_MONITOR_ALLOCATED 0x1
+#define VMBUS_OFFER_INTERRUPT_DEDICATED 0x1
+
+#define VMBUS_RING_BUFFER_FEAT_PENDING_SZ (1ul << 0)
+
+#define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 0x1
+#define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES 0x2
+#define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS 0x4
+#define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x10
+#define VMBUS_CHANNEL_LOOPBACK_OFFER 0x100
+#define VMBUS_CHANNEL_PARENT_OFFER 0x200
+#define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x400
+#define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER 0x2000
+
+#define VMBUS_PACKET_FLAG_REQUEST_COMPLETION 1
+
+typedef struct vmbus_message_header {
+ uint32_t message_type;
+ uint32_t _padding;
+} vmbus_message_header;
+
+typedef struct vmbus_message_initiate_contact {
+ vmbus_message_header header;
+ uint32_t version_requested;
+ uint32_t target_vcpu;
+ uint64_t interrupt_page;
+ uint64_t monitor_page1;
+ uint64_t monitor_page2;
+} vmbus_message_initiate_contact;
+
+typedef struct vmbus_message_version_response {
+ vmbus_message_header header;
+ uint8_t version_supported;
+ uint8_t status;
+} vmbus_message_version_response;
+
+typedef struct vmbus_message_offer_channel {
+ vmbus_message_header header;
+ uint8_t type_uuid[16];
+ uint8_t instance_uuid[16];
+ uint64_t _reserved1;
+ uint64_t _reserved2;
+ uint16_t channel_flags;
+ uint16_t mmio_size_mb;
+ uint8_t user_data[VMBUS_CHANNEL_USER_DATA_SIZE];
+ uint16_t sub_channel_index;
+ uint16_t _reserved3;
+ uint32_t child_relid;
+ uint8_t monitor_id;
+ uint8_t monitor_flags;
+ uint16_t interrupt_flags;
+ uint32_t connection_id;
+} vmbus_message_offer_channel;
+
+typedef struct vmbus_message_rescind_channel_offer {
+ vmbus_message_header header;
+ uint32_t child_relid;
+} vmbus_message_rescind_channel_offer;
+
+typedef struct vmbus_gpa_range {
+ uint32_t byte_count;
+ uint32_t byte_offset;
+ uint64_t pfn_array[];
+} vmbus_gpa_range;
+
+typedef struct vmbus_message_gpadl_header {
+ vmbus_message_header header;
+ uint32_t child_relid;
+ uint32_t gpadl_id;
+ uint16_t range_buflen;
+ uint16_t rangecount;
+ vmbus_gpa_range range[];
+} QEMU_PACKED vmbus_message_gpadl_header;
+
+typedef struct vmbus_message_gpadl_body {
+ vmbus_message_header header;
+ uint32_t message_number;
+ uint32_t gpadl_id;
+ uint64_t pfn_array[];
+} vmbus_message_gpadl_body;
+
+typedef struct vmbus_message_gpadl_created {
+ vmbus_message_header header;
+ uint32_t child_relid;
+ uint32_t gpadl_id;
+ uint32_t status;
+} vmbus_message_gpadl_created;
+
+typedef struct vmbus_message_gpadl_teardown {
+ vmbus_message_header header;
+ uint32_t child_relid;
+ uint32_t gpadl_id;
+} vmbus_message_gpadl_teardown;
+
+typedef struct vmbus_message_gpadl_torndown {
+ vmbus_message_header header;
+ uint32_t gpadl_id;
+} vmbus_message_gpadl_torndown;
+
+typedef struct vmbus_message_open_channel {
+ vmbus_message_header header;
+ uint32_t child_relid;
+ uint32_t open_id;
+ uint32_t ring_buffer_gpadl_id;
+ uint32_t target_vp;
+ uint32_t ring_buffer_offset;
+ uint8_t user_data[VMBUS_CHANNEL_USER_DATA_SIZE];
+} vmbus_message_open_channel;
+
+typedef struct vmbus_message_open_result {
+ vmbus_message_header header;
+ uint32_t child_relid;
+ uint32_t open_id;
+ uint32_t status;
+} vmbus_message_open_result;
+
+typedef struct vmbus_message_close_channel {
+ vmbus_message_header header;
+ uint32_t child_relid;
+} vmbus_message_close_channel;
+
+typedef struct vmbus_ring_buffer {
+ uint32_t write_index;
+ uint32_t read_index;
+ uint32_t interrupt_mask;
+ uint32_t pending_send_sz;
+ uint32_t _reserved1[12];
+ uint32_t feature_bits;
+} vmbus_ring_buffer;
+
+typedef struct vmbus_packet_hdr {
+ uint16_t type;
+ uint16_t offset_qwords;
+ uint16_t len_qwords;
+ uint16_t flags;
+ uint64_t transaction_id;
+} vmbus_packet_hdr;
+
+typedef struct vmbus_pkt_gpa_direct {
+ uint32_t _reserved;
+ uint32_t rangecount;
+ vmbus_gpa_range range[];
+} vmbus_pkt_gpa_direct;
+
+typedef struct vmbus_xferpg_range {
+ uint32_t byte_count;
+ uint32_t byte_offset;
+} vmbus_xferpg_range;
+
+typedef struct vmbus_pkt_xferpg {
+ uint16_t buffer_id;
+ uint8_t sender_owns_set;
+ uint8_t _reserved;
+ uint32_t rangecount;
+ vmbus_xferpg_range range[];
+} vmbus_pkt_xferpg;
+
+#endif
--
2.24.1
^ permalink raw reply related [flat|nested] 31+ messages in thread
* [PATCH v4 3/6] vmbus: vmbus implementation
2020-04-24 12:34 [PATCH v4 0/6] hyperv: VMBus implementation Jon Doron
2020-04-24 12:34 ` [PATCH v4 1/6] hyperv: expose API to determine if synic is enabled Jon Doron
2020-04-24 12:34 ` [PATCH v4 2/6] vmbus: add vmbus protocol definitions Jon Doron
@ 2020-04-24 12:34 ` Jon Doron
2020-04-24 12:34 ` [PATCH v4 4/6] i386:pc: whitelist dynamic vmbus-bridge Jon Doron
` (3 subsequent siblings)
6 siblings, 0 replies; 31+ messages in thread
From: Jon Doron @ 2020-04-24 12:34 UTC (permalink / raw)
To: qemu-devel
Cc: mail, eyakovlev, ehabkost, rvkagan, liran.alon, Roman Kagan,
pbonzini, vkuznets, Maciej S . Szmigiero, Jon Doron
Add the VMBus infrastructure -- bus, devices, root bridge, vmbus state
machine, vmbus channel interactions, etc.
VMBus is a collection of technologies. At its lowest layer, it's a message
passing and signaling mechanism, allowing efficient passing of messages to and
from guest VMs. A layer higher, it's a mechanism for defining channels of
communication, where each channel is tagged with a type (which implies a
protocol) and a instance ID. A layer higher than that, it's a bus driver,
serving as the basis of device enumeration within a VM, where a channel can
optionally be exposed as a paravirtual device. When a server-side (paravirtual
back-end) component wishes to offer a channel to a guest VM, it does so by
specifying a channel type, a mode, and an instance ID. VMBus then exposes this
in the guest.
More information about VMBus can be found in the file
vmbuskernelmodeclientlibapi.h in Microsoft's WDK.
TODO:
- split into smaller palatable pieces
- more comments
- check and handle corner cases
Kudos to Evgeny Yakovlev (formerly eyakovlev@virtuozzo.com) and Andrey
Smetatin (formerly asmetanin@virtuozzo.com) for research and
prototyping.
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Signed-off-by: Jon Doron <arilou@gmail.com>
---
Makefile.objs | 1 +
hw/hyperv/Kconfig | 5 +
hw/hyperv/Makefile.objs | 1 +
hw/hyperv/trace-events | 18 +
hw/hyperv/vmbus.c | 2672 ++++++++++++++++++++++++++++++
include/hw/hyperv/vmbus-bridge.h | 32 +
include/hw/hyperv/vmbus.h | 227 +++
7 files changed, 2956 insertions(+)
create mode 100644 hw/hyperv/trace-events
create mode 100644 hw/hyperv/vmbus.c
create mode 100644 include/hw/hyperv/vmbus-bridge.h
create mode 100644 include/hw/hyperv/vmbus.h
diff --git a/Makefile.objs b/Makefile.objs
index a7c967633a..1ef80ce58f 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -151,6 +151,7 @@ trace-events-subdirs += hw/block/dataplane
trace-events-subdirs += hw/char
trace-events-subdirs += hw/dma
trace-events-subdirs += hw/hppa
+trace-events-subdirs += hw/hyperv
trace-events-subdirs += hw/i2c
trace-events-subdirs += hw/i386
trace-events-subdirs += hw/i386/xen
diff --git a/hw/hyperv/Kconfig b/hw/hyperv/Kconfig
index a1fa8ff9be..3fbfe41c9e 100644
--- a/hw/hyperv/Kconfig
+++ b/hw/hyperv/Kconfig
@@ -6,3 +6,8 @@ config HYPERV_TESTDEV
bool
default y if TEST_DEVICES
depends on HYPERV
+
+config VMBUS
+ bool
+ default y
+ depends on HYPERV
diff --git a/hw/hyperv/Makefile.objs b/hw/hyperv/Makefile.objs
index edaca2f763..5b614e040c 100644
--- a/hw/hyperv/Makefile.objs
+++ b/hw/hyperv/Makefile.objs
@@ -1,2 +1,3 @@
obj-y += hyperv.o
obj-$(CONFIG_HYPERV_TESTDEV) += hyperv_testdev.o
+obj-$(CONFIG_VMBUS) += vmbus.o
diff --git a/hw/hyperv/trace-events b/hw/hyperv/trace-events
new file mode 100644
index 0000000000..ba5bd62d61
--- /dev/null
+++ b/hw/hyperv/trace-events
@@ -0,0 +1,18 @@
+# vmbus
+vmbus_recv_message(uint32_t type, uint32_t size) "type %d size %d"
+vmbus_signal_event(void) ""
+vmbus_channel_notify_guest(uint32_t chan_id) "channel #%d"
+vmbus_post_msg(uint32_t type, uint32_t size) "type %d size %d"
+vmbus_msg_cb(int status) "message status %d"
+vmbus_process_incoming_message(uint32_t message_type) "type %d"
+vmbus_initiate_contact(uint16_t major, uint16_t minor, uint32_t vcpu, uint64_t monitor_page1, uint64_t monitor_page2, uint64_t interrupt_page) "version %d.%d target vp %d mon pages 0x%"PRIx64",0x%"PRIx64" int page 0x%"PRIx64
+vmbus_send_offer(uint32_t chan_id, void *dev) "channel #%d dev %p"
+vmbus_terminate_offers(void) ""
+vmbus_gpadl_header(uint32_t gpadl_id, uint16_t num_gfns) "gpadl #%d gfns %d"
+vmbus_gpadl_body(uint32_t gpadl_id) "gpadl #%d"
+vmbus_gpadl_created(uint32_t gpadl_id) "gpadl #%d"
+vmbus_gpadl_teardown(uint32_t gpadl_id) "gpadl #%d"
+vmbus_gpadl_torndown(uint32_t gpadl_id) "gpadl #%d"
+vmbus_open_channel(uint32_t chan_id, uint32_t gpadl_id, uint32_t target_vp) "channel #%d gpadl #%d target vp %d"
+vmbus_channel_open(uint32_t chan_id, uint32_t status) "channel #%d status %d"
+vmbus_close_channel(uint32_t chan_id) "channel #%d"
diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
new file mode 100644
index 0000000000..1f5873ab60
--- /dev/null
+++ b/hw/hyperv/vmbus.c
@@ -0,0 +1,2672 @@
+/*
+ * QEMU Hyper-V VMBus
+ *
+ * Copyright (c) 2017-2018 Virtuozzo International GmbH.
+ *
+ * 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 "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "qemu/main-loop.h"
+#include "qapi/error.h"
+#include "migration/vmstate.h"
+#include "hw/qdev-properties.h"
+#include "hw/hyperv/hyperv.h"
+#include "hw/hyperv/vmbus.h"
+#include "hw/hyperv/vmbus-bridge.h"
+#include "hw/sysbus.h"
+#include "cpu.h"
+#include "trace.h"
+
+#define TYPE_VMBUS "vmbus"
+#define VMBUS(obj) OBJECT_CHECK(VMBus, (obj), TYPE_VMBUS)
+
+enum {
+ VMGPADL_INIT,
+ VMGPADL_ALIVE,
+ VMGPADL_TEARINGDOWN,
+ VMGPADL_TORNDOWN,
+};
+
+struct VMBusGpadl {
+ /* GPADL id */
+ uint32_t id;
+ /* associated channel id (rudimentary?) */
+ uint32_t child_relid;
+
+ /* number of pages in the GPADL as declared in GPADL_HEADER message */
+ uint32_t num_gfns;
+ /*
+ * Due to limited message size, GPADL may not fit fully in a single
+ * GPADL_HEADER message, and is further popluated using GPADL_BODY
+ * messages. @seen_gfns is the number of pages seen so far; once it
+ * reaches @num_gfns, the GPADL is ready to use.
+ */
+ uint32_t seen_gfns;
+ /* array of GFNs (of size @num_gfns once allocated) */
+ uint64_t *gfns;
+
+ uint8_t state;
+
+ QTAILQ_ENTRY(VMBusGpadl) link;
+ VMBus *vmbus;
+ unsigned refcount;
+};
+
+/*
+ * Wrap sequential read from / write to GPADL.
+ */
+typedef struct GpadlIter {
+ VMBusGpadl *gpadl;
+ AddressSpace *as;
+ DMADirection dir;
+ /* offset into GPADL where the next i/o will be performed */
+ uint32_t off;
+ /*
+ * Cached mapping of the currently accessed page, up to page boundary.
+ * Updated lazily on i/o.
+ * Note: MemoryRegionCache can not be used here because pages in the GPADL
+ * are non-contiguous and may belong to different memory regions.
+ */
+ void *map;
+ /* offset after last i/o (i.e. not affected by seek) */
+ uint32_t last_off;
+ /*
+ * Indicator that the iterator is active and may have a cached mapping.
+ * Allows to enforce bracketing of all i/o (which may create cached
+ * mappings) and thus exclude mapping leaks.
+ */
+ bool active;
+} GpadlIter;
+
+/*
+ * Ring buffer. There are two of them, sitting in the same GPADL, for each
+ * channel.
+ * Each ring buffer consists of a set of pages, with the first page containing
+ * the ring buffer header, and the remaining pages being for data packets.
+ */
+typedef struct VMBusRingBufCommon {
+ AddressSpace *as;
+ /* GPA of the ring buffer header */
+ dma_addr_t rb_addr;
+ /* start and length of the ring buffer data area within GPADL */
+ uint32_t base;
+ uint32_t len;
+
+ GpadlIter iter;
+} VMBusRingBufCommon;
+
+typedef struct VMBusSendRingBuf {
+ VMBusRingBufCommon common;
+ /* current write index, to be committed at the end of send */
+ uint32_t wr_idx;
+ /* write index at the start of send */
+ uint32_t last_wr_idx;
+ /* space to be requested from the guest */
+ uint32_t wanted;
+ /* space reserved for planned sends */
+ uint32_t reserved;
+ /* last seen read index */
+ uint32_t last_seen_rd_idx;
+} VMBusSendRingBuf;
+
+typedef struct VMBusRecvRingBuf {
+ VMBusRingBufCommon common;
+ /* current read index, to be committed at the end of receive */
+ uint32_t rd_idx;
+ /* read index at the start of receive */
+ uint32_t last_rd_idx;
+ /* last seen write index */
+ uint32_t last_seen_wr_idx;
+} VMBusRecvRingBuf;
+
+
+enum {
+ VMOFFER_INIT,
+ VMOFFER_SENDING,
+ VMOFFER_SENT,
+};
+
+enum {
+ VMCHAN_INIT,
+ VMCHAN_OPENING,
+ VMCHAN_OPEN,
+};
+
+struct VMBusChannel {
+ VMBusDevice *dev;
+
+ /* channel id */
+ uint32_t id;
+ /*
+ * subchannel index within the device; subchannel #0 is "primary" and
+ * always exists
+ */
+ uint16_t subchan_idx;
+ uint32_t open_id;
+ /* VP_INDEX of the vCPU to notify with (synthetic) interrupts */
+ uint32_t target_vp;
+ /* GPADL id to use for the ring buffers */
+ uint32_t ringbuf_gpadl;
+ /* start (in pages) of the send ring buffer within @ringbuf_gpadl */
+ uint32_t ringbuf_send_offset;
+
+ uint8_t offer_state;
+ uint8_t state;
+ bool is_open;
+
+ /* main device worker; copied from the device class */
+ VMBusChannelNotifyCb notify_cb;
+ /*
+ * guest->host notifications, either sent directly or dispatched via
+ * interrupt page (older VMBus)
+ */
+ EventNotifier notifier;
+
+ VMBus *vmbus;
+ /*
+ * SINT route to signal with host->guest notifications; may be shared with
+ * the main VMBus SINT route
+ */
+ HvSintRoute *notify_route;
+ VMBusGpadl *gpadl;
+
+ VMBusSendRingBuf send_ringbuf;
+ VMBusRecvRingBuf recv_ringbuf;
+
+ QTAILQ_ENTRY(VMBusChannel) link;
+};
+
+/*
+ * Hyper-V spec mandates that every message port has 16 buffers, which means
+ * that the guest can post up to this many messages without blocking.
+ * Therefore a queue for incoming messages has to be provided.
+ * For outgoing (i.e. host->guest) messages there's no queue; the VMBus just
+ * doesn't transition to a new state until the message is known to have been
+ * successfully delivered to the respective SynIC message slot.
+ */
+#define HV_MSG_QUEUE_LEN 16
+
+/* Hyper-V devices never use channel #0. Must be something special. */
+#define VMBUS_FIRST_CHANID 1
+/* Each channel occupies one bit within a single event page sint slot. */
+#define VMBUS_CHANID_COUNT (HV_EVENT_FLAGS_COUNT - VMBUS_FIRST_CHANID)
+/* Leave a few connection numbers for other purposes. */
+#define VMBUS_CHAN_CONNECTION_OFFSET 16
+
+/*
+ * Since the success or failure of sending a message is reported
+ * asynchronously, the VMBus state machine has effectively two entry points:
+ * vmbus_run and vmbus_msg_cb (the latter is called when the host->guest
+ * message delivery status becomes known). Both are run as oneshot BHs on the
+ * main aio context, ensuring serialization.
+ */
+enum {
+ VMBUS_LISTEN,
+ VMBUS_HANDSHAKE,
+ VMBUS_OFFER,
+ VMBUS_CREATE_GPADL,
+ VMBUS_TEARDOWN_GPADL,
+ VMBUS_OPEN_CHANNEL,
+ VMBUS_UNLOAD,
+ VMBUS_STATE_MAX
+};
+
+struct VMBus {
+ BusState parent;
+
+ uint8_t state;
+ /* protection against recursive aio_poll (see vmbus_run) */
+ bool in_progress;
+ /* whether there's a message being delivered to the guest */
+ bool msg_in_progress;
+ uint32_t version;
+ /* VP_INDEX of the vCPU to send messages and interrupts to */
+ uint32_t target_vp;
+ HvSintRoute *sint_route;
+ /*
+ * interrupt page for older protocol versions; newer ones use SynIC event
+ * flags directly
+ */
+ hwaddr int_page_gpa;
+
+ DECLARE_BITMAP(chanid_bitmap, VMBUS_CHANID_COUNT);
+
+ /* incoming message queue */
+ struct hyperv_post_message_input rx_queue[HV_MSG_QUEUE_LEN];
+ uint8_t rx_queue_head;
+ uint8_t rx_queue_size;
+ QemuMutex rx_queue_lock;
+
+ QTAILQ_HEAD(, VMBusGpadl) gpadl_list;
+ QTAILQ_HEAD(, VMBusChannel) channel_list;
+
+ /*
+ * guest->host notifications for older VMBus, to be dispatched via
+ * interrupt page
+ */
+ EventNotifier notifier;
+};
+
+static bool gpadl_full(VMBusGpadl *gpadl)
+{
+ return gpadl->seen_gfns == gpadl->num_gfns;
+}
+
+static VMBusGpadl *create_gpadl(VMBus *vmbus, uint32_t id,
+ uint32_t child_relid, uint32_t num_gfns)
+{
+ VMBusGpadl *gpadl = g_new0(VMBusGpadl, 1);
+
+ gpadl->id = id;
+ gpadl->child_relid = child_relid;
+ gpadl->num_gfns = num_gfns;
+ gpadl->gfns = g_new(uint64_t, num_gfns);
+ QTAILQ_INSERT_HEAD(&vmbus->gpadl_list, gpadl, link);
+ gpadl->vmbus = vmbus;
+ gpadl->refcount = 1;
+ return gpadl;
+}
+
+static void free_gpadl(VMBusGpadl *gpadl)
+{
+ QTAILQ_REMOVE(&gpadl->vmbus->gpadl_list, gpadl, link);
+ g_free(gpadl->gfns);
+ g_free(gpadl);
+}
+
+static VMBusGpadl *find_gpadl(VMBus *vmbus, uint32_t gpadl_id)
+{
+ VMBusGpadl *gpadl;
+ QTAILQ_FOREACH(gpadl, &vmbus->gpadl_list, link) {
+ if (gpadl->id == gpadl_id) {
+ return gpadl;
+ }
+ }
+ return NULL;
+}
+
+VMBusGpadl *vmbus_get_gpadl(VMBusChannel *chan, uint32_t gpadl_id)
+{
+ VMBusGpadl *gpadl = find_gpadl(chan->vmbus, gpadl_id);
+ if (!gpadl || !gpadl_full(gpadl)) {
+ return NULL;
+ }
+ gpadl->refcount++;
+ return gpadl;
+}
+
+void vmbus_put_gpadl(VMBusGpadl *gpadl)
+{
+ if (!gpadl) {
+ return;
+ }
+ if (--gpadl->refcount) {
+ return;
+ }
+ free_gpadl(gpadl);
+}
+
+uint32_t vmbus_gpadl_len(VMBusGpadl *gpadl)
+{
+ return gpadl->num_gfns * TARGET_PAGE_SIZE;
+}
+
+static void gpadl_iter_init(GpadlIter *iter, VMBusGpadl *gpadl,
+ AddressSpace *as, DMADirection dir)
+{
+ iter->gpadl = gpadl;
+ iter->as = as;
+ iter->dir = dir;
+ iter->active = false;
+}
+
+static inline void gpadl_iter_cache_unmap(GpadlIter *iter)
+{
+ uint32_t map_start_in_page = (uintptr_t)iter->map & ~TARGET_PAGE_MASK;
+ uint32_t io_end_in_page = ((iter->last_off - 1) & ~TARGET_PAGE_MASK) + 1;
+
+ /* mapping is only done to do non-zero amount of i/o */
+ assert(iter->last_off > 0);
+ assert(map_start_in_page < io_end_in_page);
+
+ dma_memory_unmap(iter->as, iter->map, TARGET_PAGE_SIZE - map_start_in_page,
+ iter->dir, io_end_in_page - map_start_in_page);
+}
+
+/*
+ * Copy exactly @len bytes between the GPADL pointed to by @iter and @buf.
+ * The direction of the copy is determined by @iter->dir.
+ * The caller must ensure the operation overflows neither @buf nor the GPADL
+ * (there's an assert for the latter).
+ * Reuse the currently mapped page in the GPADL if possible.
+ */
+static ssize_t gpadl_iter_io(GpadlIter *iter, void *buf, uint32_t len)
+{
+ ssize_t ret = len;
+
+ assert(iter->active);
+
+ while (len) {
+ uint32_t off_in_page = iter->off & ~TARGET_PAGE_MASK;
+ uint32_t pgleft = TARGET_PAGE_SIZE - off_in_page;
+ uint32_t cplen = MIN(pgleft, len);
+ void *p;
+
+ /* try to reuse the cached mapping */
+ if (iter->map) {
+ uint32_t map_start_in_page =
+ (uintptr_t)iter->map & ~TARGET_PAGE_MASK;
+ uint32_t off_base = iter->off & ~TARGET_PAGE_MASK;
+ uint32_t mapped_base = (iter->last_off - 1) & ~TARGET_PAGE_MASK;
+ if (off_base != mapped_base || off_in_page < map_start_in_page) {
+ gpadl_iter_cache_unmap(iter);
+ iter->map = NULL;
+ }
+ }
+
+ if (!iter->map) {
+ dma_addr_t maddr;
+ dma_addr_t mlen = pgleft;
+ uint32_t idx = iter->off >> TARGET_PAGE_BITS;
+ assert(idx < iter->gpadl->num_gfns);
+
+ maddr = (iter->gpadl->gfns[idx] << TARGET_PAGE_BITS) | off_in_page;
+
+ iter->map = dma_memory_map(iter->as, maddr, &mlen, iter->dir);
+ if (mlen != pgleft) {
+ dma_memory_unmap(iter->as, iter->map, mlen, iter->dir, 0);
+ iter->map = NULL;
+ return -EFAULT;
+ }
+ }
+
+ p = (void *)(((uintptr_t)iter->map & TARGET_PAGE_MASK) | off_in_page);
+ if (iter->dir == DMA_DIRECTION_FROM_DEVICE) {
+ memcpy(p, buf, cplen);
+ } else {
+ memcpy(buf, p, cplen);
+ }
+
+ buf += cplen;
+ len -= cplen;
+ iter->off += cplen;
+ iter->last_off = iter->off;
+ }
+
+ return ret;
+}
+
+/*
+ * Position the iterator @iter at new offset @new_off.
+ * If this results in the cached mapping being unusable with the new offset,
+ * unmap it.
+ */
+static inline void gpadl_iter_seek(GpadlIter *iter, uint32_t new_off)
+{
+ assert(iter->active);
+ iter->off = new_off;
+}
+
+/*
+ * Start a series of i/o on the GPADL.
+ * After this i/o and seek operations on @iter become legal.
+ */
+static inline void gpadl_iter_start_io(GpadlIter *iter)
+{
+ assert(!iter->active);
+ /* mapping is cached lazily on i/o */
+ iter->map = NULL;
+ iter->active = true;
+}
+
+/*
+ * End the eariler started series of i/o on the GPADL and release the cached
+ * mapping if any.
+ */
+static inline void gpadl_iter_end_io(GpadlIter *iter)
+{
+ assert(iter->active);
+
+ if (iter->map) {
+ gpadl_iter_cache_unmap(iter);
+ }
+
+ iter->active = false;
+}
+
+static void vmbus_resched(VMBus *vmbus);
+static void vmbus_msg_cb(void *data, int status);
+
+ssize_t vmbus_iov_to_gpadl(VMBusChannel *chan, VMBusGpadl *gpadl, uint32_t off,
+ const struct iovec *iov, size_t iov_cnt)
+{
+ GpadlIter iter;
+ size_t i;
+ ssize_t ret = 0;
+
+ gpadl_iter_init(&iter, gpadl, chan->dev->dma_as,
+ DMA_DIRECTION_FROM_DEVICE);
+ gpadl_iter_start_io(&iter);
+ gpadl_iter_seek(&iter, off);
+ for (i = 0; i < iov_cnt; i++) {
+ ret = gpadl_iter_io(&iter, iov[i].iov_base, iov[i].iov_len);
+ if (ret < 0) {
+ goto out;
+ }
+ }
+out:
+ gpadl_iter_end_io(&iter);
+ return ret;
+}
+
+int vmbus_map_sgl(VMBusChanReq *req, DMADirection dir, struct iovec *iov,
+ unsigned iov_cnt, size_t len, size_t off)
+{
+ int ret_cnt = 0, ret;
+ unsigned i;
+ QEMUSGList *sgl = &req->sgl;
+ ScatterGatherEntry *sg = sgl->sg;
+
+ for (i = 0; i < sgl->nsg; i++) {
+ if (sg[i].len > off) {
+ break;
+ }
+ off -= sg[i].len;
+ }
+ for (; len && i < sgl->nsg; i++) {
+ dma_addr_t mlen = MIN(sg[i].len - off, len);
+ dma_addr_t addr = sg[i].base + off;
+ len -= mlen;
+ off = 0;
+
+ for (; mlen; ret_cnt++) {
+ dma_addr_t l = mlen;
+ dma_addr_t a = addr;
+
+ if (ret_cnt == iov_cnt) {
+ ret = -ENOBUFS;
+ goto err;
+ }
+
+ iov[ret_cnt].iov_base = dma_memory_map(sgl->as, a, &l, dir);
+ if (!l) {
+ ret = -EFAULT;
+ goto err;
+ }
+ iov[ret_cnt].iov_len = l;
+ addr += l;
+ mlen -= l;
+ }
+ }
+
+ return ret_cnt;
+err:
+ vmbus_unmap_sgl(req, dir, iov, ret_cnt, 0);
+ return ret;
+}
+
+void vmbus_unmap_sgl(VMBusChanReq *req, DMADirection dir, struct iovec *iov,
+ unsigned iov_cnt, size_t accessed)
+{
+ QEMUSGList *sgl = &req->sgl;
+ unsigned i;
+
+ for (i = 0; i < iov_cnt; i++) {
+ size_t acsd = MIN(accessed, iov[i].iov_len);
+ dma_memory_unmap(sgl->as, iov[i].iov_base, iov[i].iov_len, dir, acsd);
+ accessed -= acsd;
+ }
+}
+
+static const VMStateDescription vmstate_gpadl = {
+ .name = "vmbus/gpadl",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(id, VMBusGpadl),
+ VMSTATE_UINT32(child_relid, VMBusGpadl),
+ VMSTATE_UINT32(num_gfns, VMBusGpadl),
+ VMSTATE_UINT32(seen_gfns, VMBusGpadl),
+ VMSTATE_VARRAY_UINT32_ALLOC(gfns, VMBusGpadl, num_gfns, 0,
+ vmstate_info_uint64, uint64_t),
+ VMSTATE_UINT8(state, VMBusGpadl),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+/*
+ * Wrap the index into a ring buffer of @len bytes.
+ * @idx is assumed not to exceed twice the size of the ringbuffer, so only
+ * single wraparound is considered.
+ */
+static inline uint32_t rb_idx_wrap(uint32_t idx, uint32_t len)
+{
+ if (idx >= len) {
+ idx -= len;
+ }
+ return idx;
+}
+
+/*
+ * Circular difference between two indices into a ring buffer of @len bytes.
+ * @allow_catchup - whether @idx1 may catch up @idx2; e.g. read index may catch
+ * up write index but not vice versa.
+ */
+static inline uint32_t rb_idx_delta(uint32_t idx1, uint32_t idx2, uint32_t len,
+ bool allow_catchup)
+{
+ return rb_idx_wrap(idx2 + len - idx1 - !allow_catchup, len);
+}
+
+static vmbus_ring_buffer *ringbuf_map_hdr(VMBusRingBufCommon *ringbuf)
+{
+ vmbus_ring_buffer *rb;
+ dma_addr_t mlen = sizeof(*rb);
+
+ rb = dma_memory_map(ringbuf->as, ringbuf->rb_addr, &mlen,
+ DMA_DIRECTION_FROM_DEVICE);
+ if (mlen != sizeof(*rb)) {
+ dma_memory_unmap(ringbuf->as, rb, mlen,
+ DMA_DIRECTION_FROM_DEVICE, 0);
+ return NULL;
+ }
+ return rb;
+}
+
+static void ringbuf_unmap_hdr(VMBusRingBufCommon *ringbuf,
+ vmbus_ring_buffer *rb, bool dirty)
+{
+ assert(rb);
+
+ dma_memory_unmap(ringbuf->as, rb, sizeof(*rb), DMA_DIRECTION_FROM_DEVICE,
+ dirty ? sizeof(*rb) : 0);
+}
+
+static void ringbuf_init_common(VMBusRingBufCommon *ringbuf, VMBusGpadl *gpadl,
+ AddressSpace *as, DMADirection dir,
+ uint32_t begin, uint32_t end)
+{
+ ringbuf->as = as;
+ ringbuf->rb_addr = gpadl->gfns[begin] << TARGET_PAGE_BITS;
+ ringbuf->base = (begin + 1) << TARGET_PAGE_BITS;
+ ringbuf->len = (end - begin - 1) << TARGET_PAGE_BITS;
+ gpadl_iter_init(&ringbuf->iter, gpadl, as, dir);
+}
+
+static int ringbufs_init(VMBusChannel *chan)
+{
+ vmbus_ring_buffer *rb;
+ VMBusSendRingBuf *send_ringbuf = &chan->send_ringbuf;
+ VMBusRecvRingBuf *recv_ringbuf = &chan->recv_ringbuf;
+
+ if (chan->ringbuf_send_offset <= 1 ||
+ chan->gpadl->num_gfns <= chan->ringbuf_send_offset + 1) {
+ return -EINVAL;
+ }
+
+ ringbuf_init_common(&recv_ringbuf->common, chan->gpadl, chan->dev->dma_as,
+ DMA_DIRECTION_TO_DEVICE, 0, chan->ringbuf_send_offset);
+ ringbuf_init_common(&send_ringbuf->common, chan->gpadl, chan->dev->dma_as,
+ DMA_DIRECTION_FROM_DEVICE, chan->ringbuf_send_offset,
+ chan->gpadl->num_gfns);
+ send_ringbuf->wanted = 0;
+ send_ringbuf->reserved = 0;
+
+ rb = ringbuf_map_hdr(&recv_ringbuf->common);
+ if (!rb) {
+ return -EFAULT;
+ }
+ recv_ringbuf->rd_idx = recv_ringbuf->last_rd_idx = rb->read_index;
+ ringbuf_unmap_hdr(&recv_ringbuf->common, rb, false);
+
+ rb = ringbuf_map_hdr(&send_ringbuf->common);
+ if (!rb) {
+ return -EFAULT;
+ }
+ send_ringbuf->wr_idx = send_ringbuf->last_wr_idx = rb->write_index;
+ send_ringbuf->last_seen_rd_idx = rb->read_index;
+ rb->feature_bits |= VMBUS_RING_BUFFER_FEAT_PENDING_SZ;
+ ringbuf_unmap_hdr(&send_ringbuf->common, rb, true);
+
+ if (recv_ringbuf->rd_idx >= recv_ringbuf->common.len ||
+ send_ringbuf->wr_idx >= send_ringbuf->common.len) {
+ return -EOVERFLOW;
+ }
+
+ return 0;
+}
+
+/*
+ * Perform io between the GPADL-backed ringbuffer @ringbuf and @buf, wrapping
+ * around if needed.
+ * @len is assumed not to exceed the size of the ringbuffer, so only single
+ * wraparound is considered.
+ */
+static ssize_t ringbuf_io(VMBusRingBufCommon *ringbuf, void *buf, uint32_t len)
+{
+ ssize_t ret1 = 0, ret2 = 0;
+ uint32_t remain = ringbuf->len + ringbuf->base - ringbuf->iter.off;
+
+ if (len >= remain) {
+ ret1 = gpadl_iter_io(&ringbuf->iter, buf, remain);
+ if (ret1 < 0) {
+ return ret1;
+ }
+ gpadl_iter_seek(&ringbuf->iter, ringbuf->base);
+ buf += remain;
+ len -= remain;
+ }
+ ret2 = gpadl_iter_io(&ringbuf->iter, buf, len);
+ if (ret2 < 0) {
+ return ret2;
+ }
+ return ret1 + ret2;
+}
+
+/*
+ * Position the circular iterator within @ringbuf to offset @new_off, wrapping
+ * around if needed.
+ * @new_off is assumed not to exceed twice the size of the ringbuffer, so only
+ * single wraparound is considered.
+ */
+static inline void ringbuf_seek(VMBusRingBufCommon *ringbuf, uint32_t new_off)
+{
+ gpadl_iter_seek(&ringbuf->iter,
+ ringbuf->base + rb_idx_wrap(new_off, ringbuf->len));
+}
+
+static inline uint32_t ringbuf_tell(VMBusRingBufCommon *ringbuf)
+{
+ return ringbuf->iter.off - ringbuf->base;
+}
+
+static inline void ringbuf_start_io(VMBusRingBufCommon *ringbuf)
+{
+ gpadl_iter_start_io(&ringbuf->iter);
+}
+
+static inline void ringbuf_end_io(VMBusRingBufCommon *ringbuf)
+{
+ gpadl_iter_end_io(&ringbuf->iter);
+}
+
+VMBusDevice *vmbus_channel_device(VMBusChannel *chan)
+{
+ return chan->dev;
+}
+
+VMBusChannel *vmbus_device_channel(VMBusDevice *dev, uint32_t chan_idx)
+{
+ if (chan_idx >= dev->num_channels) {
+ return NULL;
+ }
+ return &dev->channels[chan_idx];
+}
+
+uint32_t vmbus_channel_idx(VMBusChannel *chan)
+{
+ return chan - chan->dev->channels;
+}
+
+void vmbus_channel_notify_host(VMBusChannel *chan)
+{
+ event_notifier_set(&chan->notifier);
+}
+
+bool vmbus_channel_is_open(VMBusChannel *chan)
+{
+ return chan->is_open;
+}
+
+/*
+ * Notify the guest side about the data to work on in the channel ring buffer.
+ * The notification is done by signaling a dedicated per-channel SynIC event
+ * flag (more recent guests) or setting a bit in the interrupt page and firing
+ * the VMBus SINT (older guests).
+ */
+static int vmbus_channel_notify_guest(VMBusChannel *chan)
+{
+ int res = 0;
+ unsigned long *int_map, mask;
+ unsigned idx;
+ hwaddr addr = chan->vmbus->int_page_gpa;
+ hwaddr len = TARGET_PAGE_SIZE / 2, dirty = 0;
+
+ trace_vmbus_channel_notify_guest(chan->id);
+
+ if (!addr) {
+ return hyperv_set_event_flag(chan->notify_route, chan->id);
+ }
+
+ int_map = cpu_physical_memory_map(addr, &len, 1);
+ if (len != TARGET_PAGE_SIZE / 2) {
+ res = -ENXIO;
+ goto unmap;
+ }
+
+ idx = BIT_WORD(chan->id);
+ mask = BIT_MASK(chan->id);
+ if ((atomic_fetch_or(&int_map[idx], mask) & mask) != mask) {
+ res = hyperv_sint_route_set_sint(chan->notify_route);
+ dirty = len;
+ }
+
+unmap:
+ cpu_physical_memory_unmap(int_map, len, 1, dirty);
+ return res;
+}
+
+#define VMBUS_PKT_TRAILER sizeof(uint64_t)
+
+static uint32_t vmbus_pkt_hdr_set_offsets(vmbus_packet_hdr *hdr,
+ uint32_t desclen, uint32_t msglen)
+{
+ hdr->offset_qwords = sizeof(*hdr) / sizeof(uint64_t) +
+ DIV_ROUND_UP(desclen, sizeof(uint64_t));
+ hdr->len_qwords = hdr->offset_qwords +
+ DIV_ROUND_UP(msglen, sizeof(uint64_t));
+ return hdr->len_qwords * sizeof(uint64_t) + VMBUS_PKT_TRAILER;
+}
+
+/*
+ * Simplified ring buffer operation with paired barriers annotations in the
+ * producer and consumer loops:
+ *
+ * producer * consumer
+ * ~~~~~~~~ * ~~~~~~~~
+ * write pending_send_sz * read write_index
+ * smp_mb [A] * smp_mb [C]
+ * read read_index * read packet
+ * smp_mb [B] * read/write out-of-band data
+ * read/write out-of-band data * smp_mb [B]
+ * write packet * write read_index
+ * smp_mb [C] * smp_mb [A]
+ * write write_index * read pending_send_sz
+ * smp_wmb [D] * smp_rmb [D]
+ * write pending_send_sz * read write_index
+ * ... * ...
+ */
+
+static inline uint32_t ringbuf_send_avail(VMBusSendRingBuf *ringbuf)
+{
+ /* don't trust guest data */
+ if (ringbuf->last_seen_rd_idx >= ringbuf->common.len) {
+ return 0;
+ }
+ return rb_idx_delta(ringbuf->wr_idx, ringbuf->last_seen_rd_idx,
+ ringbuf->common.len, false);
+}
+
+static ssize_t ringbuf_send_update_idx(VMBusChannel *chan)
+{
+ VMBusSendRingBuf *ringbuf = &chan->send_ringbuf;
+ vmbus_ring_buffer *rb;
+ uint32_t written;
+
+ written = rb_idx_delta(ringbuf->last_wr_idx, ringbuf->wr_idx,
+ ringbuf->common.len, true);
+ if (!written) {
+ return 0;
+ }
+
+ rb = ringbuf_map_hdr(&ringbuf->common);
+ if (!rb) {
+ return -EFAULT;
+ }
+
+ ringbuf->reserved -= written;
+
+ /* prevent reorder with the data operation and packet write */
+ smp_mb(); /* barrier pair [C] */
+ rb->write_index = ringbuf->wr_idx;
+
+ /*
+ * If the producer earlier indicated that it wants to be notified when the
+ * consumer frees certain amount of space in the ring buffer, that amount
+ * is reduced by the size of the completed write.
+ */
+ if (ringbuf->wanted) {
+ /* otherwise reservation would fail */
+ assert(ringbuf->wanted < written);
+ ringbuf->wanted -= written;
+ /* prevent reorder with write_index write */
+ smp_wmb(); /* barrier pair [D] */
+ rb->pending_send_sz = ringbuf->wanted;
+ }
+
+ /* prevent reorder with write_index or pending_send_sz write */
+ smp_mb(); /* barrier pair [A] */
+ ringbuf->last_seen_rd_idx = rb->read_index;
+
+ /*
+ * The consumer may have missed the reduction of pending_send_sz and skip
+ * notification, so re-check the blocking condition, and, if it's no longer
+ * true, ensure processing another iteration by simulating consumer's
+ * notification.
+ */
+ if (ringbuf_send_avail(ringbuf) >= ringbuf->wanted) {
+ vmbus_channel_notify_host(chan);
+ }
+
+ /* skip notification by consumer's request */
+ if (rb->interrupt_mask) {
+ goto out;
+ }
+
+ /*
+ * The consumer hasn't caught up with the producer's previous state so it's
+ * not blocked.
+ * (last_seen_rd_idx comes from the guest but it's safe to use w/o
+ * validation here as it only affects notification.)
+ */
+ if (rb_idx_delta(ringbuf->last_seen_rd_idx, ringbuf->wr_idx,
+ ringbuf->common.len, true) > written) {
+ goto out;
+ }
+
+ vmbus_channel_notify_guest(chan);
+out:
+ ringbuf_unmap_hdr(&ringbuf->common, rb, true);
+ ringbuf->last_wr_idx = ringbuf->wr_idx;
+ return written;
+}
+
+int vmbus_channel_reserve(VMBusChannel *chan,
+ uint32_t desclen, uint32_t msglen)
+{
+ VMBusSendRingBuf *ringbuf = &chan->send_ringbuf;
+ vmbus_ring_buffer *rb = NULL;
+ vmbus_packet_hdr hdr;
+ uint32_t needed = ringbuf->reserved +
+ vmbus_pkt_hdr_set_offsets(&hdr, desclen, msglen);
+
+ /* avoid touching the guest memory if possible */
+ if (likely(needed <= ringbuf_send_avail(ringbuf))) {
+ goto success;
+ }
+
+ rb = ringbuf_map_hdr(&ringbuf->common);
+ if (!rb) {
+ return -EFAULT;
+ }
+
+ /* fetch read index from guest memory and try again */
+ ringbuf->last_seen_rd_idx = rb->read_index;
+
+ if (likely(needed <= ringbuf_send_avail(ringbuf))) {
+ goto success;
+ }
+
+ rb->pending_send_sz = needed;
+
+ /*
+ * The consumer may have made progress and freed up some space before
+ * seeing updated pending_send_sz, so re-read read_index (preventing
+ * reorder with the pending_send_sz write) and try again.
+ */
+ smp_mb(); /* barrier pair [A] */
+ ringbuf->last_seen_rd_idx = rb->read_index;
+
+ if (needed > ringbuf_send_avail(ringbuf)) {
+ goto out;
+ }
+
+success:
+ ringbuf->reserved = needed;
+ needed = 0;
+
+ /* clear pending_send_sz if it was set */
+ if (ringbuf->wanted) {
+ if (!rb) {
+ rb = ringbuf_map_hdr(&ringbuf->common);
+ if (!rb) {
+ /* failure to clear pending_send_sz is non-fatal */
+ goto out;
+ }
+ }
+
+ rb->pending_send_sz = 0;
+ }
+
+ /* prevent reorder of the following data operation with read_index read */
+ smp_mb(); /* barrier pair [B] */
+
+out:
+ if (rb) {
+ ringbuf_unmap_hdr(&ringbuf->common, rb, ringbuf->wanted == needed);
+ }
+ ringbuf->wanted = needed;
+ return needed ? -ENOSPC : 0;
+}
+
+ssize_t vmbus_channel_send(VMBusChannel *chan, uint16_t pkt_type,
+ void *desc, uint32_t desclen,
+ void *msg, uint32_t msglen,
+ bool need_comp, uint64_t transaction_id)
+{
+ ssize_t ret = 0;
+ vmbus_packet_hdr hdr;
+ uint32_t totlen;
+ VMBusSendRingBuf *ringbuf = &chan->send_ringbuf;
+
+ if (!vmbus_channel_is_open(chan)) {
+ return -EINVAL;
+ }
+
+ totlen = vmbus_pkt_hdr_set_offsets(&hdr, desclen, msglen);
+ hdr.type = pkt_type;
+ hdr.flags = need_comp ? VMBUS_PACKET_FLAG_REQUEST_COMPLETION : 0;
+ hdr.transaction_id = transaction_id;
+
+ assert(totlen <= ringbuf->reserved);
+
+ ringbuf_start_io(&ringbuf->common);
+ ringbuf_seek(&ringbuf->common, ringbuf->wr_idx);
+ ret = ringbuf_io(&ringbuf->common, &hdr, sizeof(hdr));
+ if (ret < 0) {
+ goto out;
+ }
+ if (desclen) {
+ assert(desc);
+ ret = ringbuf_io(&ringbuf->common, desc, desclen);
+ if (ret < 0) {
+ goto out;
+ }
+ ringbuf_seek(&ringbuf->common,
+ ringbuf->wr_idx + hdr.offset_qwords * sizeof(uint64_t));
+ }
+ ret = ringbuf_io(&ringbuf->common, msg, msglen);
+ if (ret < 0) {
+ goto out;
+ }
+ ringbuf_seek(&ringbuf->common, ringbuf->wr_idx + totlen);
+ ringbuf->wr_idx = ringbuf_tell(&ringbuf->common);
+ ret = 0;
+out:
+ ringbuf_end_io(&ringbuf->common);
+ if (ret) {
+ return ret;
+ }
+ return ringbuf_send_update_idx(chan);
+}
+
+ssize_t vmbus_channel_send_completion(VMBusChanReq *req,
+ void *msg, uint32_t msglen)
+{
+ assert(req->need_comp);
+ return vmbus_channel_send(req->chan, VMBUS_PACKET_COMP, NULL, 0,
+ msg, msglen, false, req->transaction_id);
+}
+
+static int sgl_from_gpa_ranges(QEMUSGList *sgl, VMBusDevice *dev,
+ VMBusRingBufCommon *ringbuf, uint32_t len)
+{
+ int ret;
+ vmbus_pkt_gpa_direct hdr;
+ hwaddr curaddr = 0;
+ hwaddr curlen = 0;
+ int num;
+
+ if (len < sizeof(hdr)) {
+ return -EIO;
+ }
+ ret = ringbuf_io(ringbuf, &hdr, sizeof(hdr));
+ if (ret < 0) {
+ return ret;
+ }
+ len -= sizeof(hdr);
+
+ num = (len - hdr.rangecount * sizeof(vmbus_gpa_range)) / sizeof(uint64_t);
+ if (num < 0) {
+ return -EIO;
+ }
+ qemu_sglist_init(sgl, DEVICE(dev), num, ringbuf->as);
+
+ for (; hdr.rangecount; hdr.rangecount--) {
+ vmbus_gpa_range range;
+
+ if (len < sizeof(range)) {
+ goto eio;
+ }
+ ret = ringbuf_io(ringbuf, &range, sizeof(range));
+ if (ret < 0) {
+ goto err;
+ }
+ len -= sizeof(range);
+
+ if (range.byte_offset & TARGET_PAGE_MASK) {
+ goto eio;
+ }
+
+ for (; range.byte_count; range.byte_offset = 0) {
+ uint64_t paddr;
+ uint32_t plen = MIN(range.byte_count,
+ TARGET_PAGE_SIZE - range.byte_offset);
+
+ if (len < sizeof(uint64_t)) {
+ goto eio;
+ }
+ ret = ringbuf_io(ringbuf, &paddr, sizeof(paddr));
+ if (ret < 0) {
+ goto err;
+ }
+ len -= sizeof(uint64_t);
+ paddr <<= TARGET_PAGE_BITS;
+ paddr |= range.byte_offset;
+ range.byte_count -= plen;
+
+ if (curaddr + curlen == paddr) {
+ /* consecutive fragments - join */
+ curlen += plen;
+ } else {
+ if (curlen) {
+ qemu_sglist_add(sgl, curaddr, curlen);
+ }
+
+ curaddr = paddr;
+ curlen = plen;
+ }
+ }
+ }
+
+ if (curlen) {
+ qemu_sglist_add(sgl, curaddr, curlen);
+ }
+
+ return 0;
+eio:
+ ret = -EIO;
+err:
+ qemu_sglist_destroy(sgl);
+ return ret;
+}
+
+static VMBusChanReq *vmbus_alloc_req(VMBusChannel *chan,
+ uint32_t size, uint16_t pkt_type,
+ uint32_t msglen, uint64_t transaction_id,
+ bool need_comp)
+{
+ VMBusChanReq *req;
+ uint32_t msgoff = QEMU_ALIGN_UP(size, __alignof__(*req->msg));
+ uint32_t totlen = msgoff + msglen;
+
+ req = g_malloc0(totlen);
+ req->chan = chan;
+ req->pkt_type = pkt_type;
+ req->msg = (void *)req + msgoff;
+ req->msglen = msglen;
+ req->transaction_id = transaction_id;
+ req->need_comp = need_comp;
+ return req;
+}
+
+int vmbus_channel_recv_start(VMBusChannel *chan)
+{
+ VMBusRecvRingBuf *ringbuf = &chan->recv_ringbuf;
+ vmbus_ring_buffer *rb;
+
+ rb = ringbuf_map_hdr(&ringbuf->common);
+ if (!rb) {
+ return -EFAULT;
+ }
+ ringbuf->last_seen_wr_idx = rb->write_index;
+ ringbuf_unmap_hdr(&ringbuf->common, rb, false);
+
+ if (ringbuf->last_seen_wr_idx >= ringbuf->common.len) {
+ return -EOVERFLOW;
+ }
+
+ /* prevent reorder of the following data operation with write_index read */
+ smp_mb(); /* barrier pair [C] */
+ return 0;
+}
+
+void *vmbus_channel_recv_peek(VMBusChannel *chan, uint32_t size)
+{
+ VMBusRecvRingBuf *ringbuf = &chan->recv_ringbuf;
+ vmbus_packet_hdr hdr = {};
+ VMBusChanReq *req;
+ uint32_t avail;
+ uint32_t totlen, pktlen, msglen, msgoff, desclen;
+
+ assert(size >= sizeof(*req));
+
+ /* safe as last_seen_wr_idx is validated in vmbus_channel_recv_start */
+ avail = rb_idx_delta(ringbuf->rd_idx, ringbuf->last_seen_wr_idx,
+ ringbuf->common.len, true);
+ if (avail < sizeof(hdr)) {
+ return NULL;
+ }
+
+ ringbuf_seek(&ringbuf->common, ringbuf->rd_idx);
+ if (ringbuf_io(&ringbuf->common, &hdr, sizeof(hdr)) < 0) {
+ return NULL;
+ }
+
+ pktlen = hdr.len_qwords * sizeof(uint64_t);
+ totlen = pktlen + VMBUS_PKT_TRAILER;
+ if (totlen > avail) {
+ return NULL;
+ }
+
+ msgoff = hdr.offset_qwords * sizeof(uint64_t);
+ if (msgoff > pktlen || msgoff < sizeof(hdr)) {
+ error_report("%s: malformed packet: %u %u", __func__, msgoff, pktlen);
+ return NULL;
+ }
+
+ msglen = pktlen - msgoff;
+
+ req = vmbus_alloc_req(chan, size, hdr.type, msglen, hdr.transaction_id,
+ hdr.flags & VMBUS_PACKET_FLAG_REQUEST_COMPLETION);
+
+ switch (hdr.type) {
+ case VMBUS_PACKET_DATA_USING_GPA_DIRECT:
+ desclen = msgoff - sizeof(hdr);
+ if (sgl_from_gpa_ranges(&req->sgl, chan->dev, &ringbuf->common,
+ desclen) < 0) {
+ error_report("%s: failed to convert GPA ranges to SGL", __func__);
+ goto free_req;
+ }
+ break;
+ case VMBUS_PACKET_DATA_INBAND:
+ case VMBUS_PACKET_COMP:
+ break;
+ default:
+ error_report("%s: unexpected msg type: %x", __func__, hdr.type);
+ goto free_req;
+ }
+
+ ringbuf_seek(&ringbuf->common, ringbuf->rd_idx + msgoff);
+ if (ringbuf_io(&ringbuf->common, req->msg, msglen) < 0) {
+ goto free_req;
+ }
+ ringbuf_seek(&ringbuf->common, ringbuf->rd_idx + totlen);
+
+ return req;
+free_req:
+ vmbus_free_req(req);
+ return NULL;
+}
+
+void vmbus_channel_recv_pop(VMBusChannel *chan)
+{
+ VMBusRecvRingBuf *ringbuf = &chan->recv_ringbuf;
+ ringbuf->rd_idx = ringbuf_tell(&ringbuf->common);
+}
+
+ssize_t vmbus_channel_recv_done(VMBusChannel *chan)
+{
+ VMBusRecvRingBuf *ringbuf = &chan->recv_ringbuf;
+ vmbus_ring_buffer *rb;
+ uint32_t read;
+
+ read = rb_idx_delta(ringbuf->last_rd_idx, ringbuf->rd_idx,
+ ringbuf->common.len, true);
+ if (!read) {
+ return 0;
+ }
+
+ rb = ringbuf_map_hdr(&ringbuf->common);
+ if (!rb) {
+ return -EFAULT;
+ }
+
+ /* prevent reorder with the data operation and packet read */
+ smp_mb(); /* barrier pair [B] */
+ rb->read_index = ringbuf->rd_idx;
+
+ /* prevent reorder of the following pending_send_sz read */
+ smp_mb(); /* barrier pair [A] */
+
+ if (rb->interrupt_mask) {
+ goto out;
+ }
+
+ if (rb->feature_bits & VMBUS_RING_BUFFER_FEAT_PENDING_SZ) {
+ uint32_t wr_idx, wr_avail;
+ uint32_t wanted = rb->pending_send_sz;
+
+ if (!wanted) {
+ goto out;
+ }
+
+ /* prevent reorder with pending_send_sz read */
+ smp_rmb(); /* barrier pair [D] */
+ wr_idx = rb->write_index;
+
+ wr_avail = rb_idx_delta(wr_idx, ringbuf->rd_idx, ringbuf->common.len,
+ true);
+
+ /* the producer wasn't blocked on the consumer state */
+ if (wr_avail >= read + wanted) {
+ goto out;
+ }
+ /* there's not enough space for the producer to make progress */
+ if (wr_avail < wanted) {
+ goto out;
+ }
+ }
+
+ vmbus_channel_notify_guest(chan);
+out:
+ ringbuf_unmap_hdr(&ringbuf->common, rb, true);
+ ringbuf->last_rd_idx = ringbuf->rd_idx;
+ return read;
+}
+
+void vmbus_free_req(void *req)
+{
+ VMBusChanReq *r = req;
+
+ if (!req) {
+ return;
+ }
+
+ if (r->sgl.dev) {
+ qemu_sglist_destroy(&r->sgl);
+ }
+ g_free(req);
+}
+
+static void channel_event_cb(EventNotifier *e)
+{
+ VMBusChannel *chan = container_of(e, VMBusChannel, notifier);
+ if (event_notifier_test_and_clear(e)) {
+ /*
+ * All receives are supposed to happen within the device worker, so
+ * bracket it with ringbuf_start/end_io on the receive ringbuffer, and
+ * potentially reuse the cached mapping throughout the worker.
+ * Can't do this for sends as they may happen outside the device
+ * worker.
+ */
+ VMBusRecvRingBuf *ringbuf = &chan->recv_ringbuf;
+ ringbuf_start_io(&ringbuf->common);
+ chan->notify_cb(chan);
+ ringbuf_end_io(&ringbuf->common);
+
+ }
+}
+
+static int alloc_chan_id(VMBus *vmbus)
+{
+ int ret;
+
+ ret = find_next_zero_bit(vmbus->chanid_bitmap, VMBUS_CHANID_COUNT, 0);
+ if (ret == VMBUS_CHANID_COUNT) {
+ return -ENOMEM;
+ }
+ return ret + VMBUS_FIRST_CHANID;
+}
+
+static int register_chan_id(VMBusChannel *chan)
+{
+ return test_and_set_bit(chan->id - VMBUS_FIRST_CHANID,
+ chan->vmbus->chanid_bitmap) ? -EEXIST : 0;
+}
+
+static void unregister_chan_id(VMBusChannel *chan)
+{
+ clear_bit(chan->id - VMBUS_FIRST_CHANID, chan->vmbus->chanid_bitmap);
+}
+
+static uint32_t chan_connection_id(VMBusChannel *chan)
+{
+ return VMBUS_CHAN_CONNECTION_OFFSET + chan->id;
+}
+
+static void init_channel(VMBus *vmbus, VMBusDevice *dev, VMBusDeviceClass *vdc,
+ VMBusChannel *chan, uint16_t idx, Error **errp)
+{
+ int res;
+
+ chan->dev = dev;
+ chan->notify_cb = vdc->chan_notify_cb;
+ chan->subchan_idx = idx;
+ chan->vmbus = vmbus;
+
+ res = alloc_chan_id(vmbus);
+ if (res < 0) {
+ error_setg(errp, "no spare channel id");
+ return;
+ }
+ chan->id = res;
+ register_chan_id(chan);
+
+ /*
+ * The guest drivers depend on the device subchannels (idx #1+) to be
+ * offered after the primary channel (idx #0) of that device. To ensure
+ * that, record the channels on the channel list in the order they appear
+ * within the device.
+ */
+ QTAILQ_INSERT_TAIL(&vmbus->channel_list, chan, link);
+}
+
+static void deinit_channel(VMBusChannel *chan)
+{
+ assert(chan->state == VMCHAN_INIT);
+ QTAILQ_REMOVE(&chan->vmbus->channel_list, chan, link);
+ unregister_chan_id(chan);
+}
+
+static void create_channels(VMBus *vmbus, VMBusDevice *dev, Error **errp)
+{
+ uint16_t i;
+ VMBusDeviceClass *vdc = VMBUS_DEVICE_GET_CLASS(dev);
+ Error *err = NULL;
+
+ dev->num_channels = vdc->num_channels ? vdc->num_channels(dev) : 1;
+ if (dev->num_channels < 1) {
+ error_setg(&err, "invalid #channels: %u", dev->num_channels);
+ goto error_out;
+ }
+
+ dev->channels = g_new0(VMBusChannel, dev->num_channels);
+ for (i = 0; i < dev->num_channels; i++) {
+ init_channel(vmbus, dev, vdc, &dev->channels[i], i, &err);
+ if (err) {
+ goto err_init;
+ }
+ }
+
+ return;
+
+err_init:
+ while (i--) {
+ deinit_channel(&dev->channels[i]);
+ }
+error_out:
+ error_propagate(errp, err);
+}
+
+static void free_channels(VMBusDevice *dev)
+{
+ uint16_t i;
+ for (i = 0; i < dev->num_channels; i++) {
+ deinit_channel(&dev->channels[i]);
+ }
+ g_free(dev->channels);
+}
+
+static HvSintRoute *make_sint_route(VMBus *vmbus, uint32_t vp_index)
+{
+ VMBusChannel *chan;
+
+ if (vp_index == vmbus->target_vp) {
+ hyperv_sint_route_ref(vmbus->sint_route);
+ return vmbus->sint_route;
+ }
+
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (chan->target_vp == vp_index && vmbus_channel_is_open(chan)) {
+ hyperv_sint_route_ref(chan->notify_route);
+ return chan->notify_route;
+ }
+ }
+
+ return hyperv_sint_route_new(vp_index, VMBUS_SINT, NULL, NULL);
+}
+
+static void open_channel(VMBusChannel *chan)
+{
+ VMBusDeviceClass *vdc = VMBUS_DEVICE_GET_CLASS(chan->dev);
+
+ chan->gpadl = vmbus_get_gpadl(chan, chan->ringbuf_gpadl);
+ if (!chan->gpadl) {
+ return;
+ }
+
+ if (ringbufs_init(chan)) {
+ goto put_gpadl;
+ }
+
+ if (event_notifier_init(&chan->notifier, 0)) {
+ goto put_gpadl;
+ }
+
+ event_notifier_set_handler(&chan->notifier, channel_event_cb);
+
+ if (hyperv_set_event_flag_handler(chan_connection_id(chan),
+ &chan->notifier)) {
+ goto cleanup_notifier;
+ }
+
+ chan->notify_route = make_sint_route(chan->vmbus, chan->target_vp);
+ if (!chan->notify_route) {
+ goto clear_event_flag_handler;
+ }
+
+ if (vdc->open_channel && vdc->open_channel(chan)) {
+ goto unref_sint_route;
+ }
+
+ chan->is_open = true;
+ return;
+
+unref_sint_route:
+ hyperv_sint_route_unref(chan->notify_route);
+clear_event_flag_handler:
+ hyperv_set_event_flag_handler(chan_connection_id(chan), NULL);
+cleanup_notifier:
+ event_notifier_set_handler(&chan->notifier, NULL);
+ event_notifier_cleanup(&chan->notifier);
+put_gpadl:
+ vmbus_put_gpadl(chan->gpadl);
+}
+
+static void close_channel(VMBusChannel *chan)
+{
+ VMBusDeviceClass *vdc = VMBUS_DEVICE_GET_CLASS(chan->dev);
+
+ if (!chan->is_open) {
+ return;
+ }
+
+ if (vdc->close_channel) {
+ vdc->close_channel(chan);
+ }
+
+ hyperv_sint_route_unref(chan->notify_route);
+ hyperv_set_event_flag_handler(chan_connection_id(chan), NULL);
+ event_notifier_set_handler(&chan->notifier, NULL);
+ event_notifier_cleanup(&chan->notifier);
+ vmbus_put_gpadl(chan->gpadl);
+ chan->is_open = false;
+}
+
+static int channel_post_load(void *opaque, int version_id)
+{
+ VMBusChannel *chan = opaque;
+
+ return register_chan_id(chan);
+}
+
+static const VMStateDescription vmstate_channel = {
+ .name = "vmbus/channel",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .post_load = channel_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(id, VMBusChannel),
+ VMSTATE_UINT16(subchan_idx, VMBusChannel),
+ VMSTATE_UINT32(open_id, VMBusChannel),
+ VMSTATE_UINT32(target_vp, VMBusChannel),
+ VMSTATE_UINT32(ringbuf_gpadl, VMBusChannel),
+ VMSTATE_UINT32(ringbuf_send_offset, VMBusChannel),
+ VMSTATE_UINT8(offer_state, VMBusChannel),
+ VMSTATE_UINT8(state, VMBusChannel),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static VMBusChannel *find_channel(VMBus *vmbus, uint32_t id)
+{
+ VMBusChannel *chan;
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (chan->id == id) {
+ return chan;
+ }
+ }
+ return NULL;
+}
+
+static int enqueue_incoming_message(VMBus *vmbus,
+ const struct hyperv_post_message_input *msg)
+{
+ int ret = 0;
+ uint8_t idx, prev_size;
+
+ qemu_mutex_lock(&vmbus->rx_queue_lock);
+
+ if (vmbus->rx_queue_size == HV_MSG_QUEUE_LEN) {
+ ret = -ENOBUFS;
+ goto out;
+ }
+
+ prev_size = vmbus->rx_queue_size;
+ idx = (vmbus->rx_queue_head + vmbus->rx_queue_size) % HV_MSG_QUEUE_LEN;
+ memcpy(&vmbus->rx_queue[idx], msg, sizeof(*msg));
+ vmbus->rx_queue_size++;
+
+ /* only need to resched if the queue was empty before */
+ if (!prev_size) {
+ vmbus_resched(vmbus);
+ }
+out:
+ qemu_mutex_unlock(&vmbus->rx_queue_lock);
+ return ret;
+}
+
+static uint16_t vmbus_recv_message(const struct hyperv_post_message_input *msg,
+ void *data)
+{
+ VMBus *vmbus = data;
+ struct vmbus_message_header *vmbus_msg;
+
+ if (msg->message_type != HV_MESSAGE_VMBUS) {
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ }
+
+ if (msg->payload_size < sizeof(struct vmbus_message_header)) {
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ }
+
+ vmbus_msg = (struct vmbus_message_header *)msg->payload;
+
+ trace_vmbus_recv_message(vmbus_msg->message_type, msg->payload_size);
+
+ if (vmbus_msg->message_type == VMBUS_MSG_INVALID ||
+ vmbus_msg->message_type >= VMBUS_MSG_COUNT) {
+ error_report("vmbus: unknown message type %#x",
+ vmbus_msg->message_type);
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ }
+
+ if (enqueue_incoming_message(vmbus, msg)) {
+ return HV_STATUS_INSUFFICIENT_BUFFERS;
+ }
+ return HV_STATUS_SUCCESS;
+}
+
+static bool vmbus_initialized(VMBus *vmbus)
+{
+ return vmbus->version > 0 && vmbus->version <= VMBUS_VERSION_CURRENT;
+}
+
+static void vmbus_reset_all(VMBus *vmbus)
+{
+ qbus_reset_all(BUS(vmbus));
+}
+
+static void post_msg(VMBus *vmbus, void *msgdata, uint32_t msglen)
+{
+ int ret;
+ struct hyperv_message msg = {
+ .header.message_type = HV_MESSAGE_VMBUS,
+ };
+
+ assert(!vmbus->msg_in_progress);
+ assert(msglen <= sizeof(msg.payload));
+ assert(msglen >= sizeof(struct vmbus_message_header));
+
+ vmbus->msg_in_progress = true;
+
+ trace_vmbus_post_msg(((struct vmbus_message_header *)msgdata)->message_type,
+ msglen);
+
+ memcpy(msg.payload, msgdata, msglen);
+ msg.header.payload_size = ROUND_UP(msglen, VMBUS_MESSAGE_SIZE_ALIGN);
+
+ ret = hyperv_post_msg(vmbus->sint_route, &msg);
+ if (ret == 0 || ret == -EAGAIN) {
+ return;
+ }
+
+ error_report("message delivery fatal failure: %d; aborting vmbus", ret);
+ vmbus_reset_all(vmbus);
+}
+
+static int vmbus_init(VMBus *vmbus)
+{
+ if (vmbus->target_vp != (uint32_t)-1) {
+ vmbus->sint_route = hyperv_sint_route_new(vmbus->target_vp, VMBUS_SINT,
+ vmbus_msg_cb, vmbus);
+ if (!vmbus->sint_route) {
+ error_report("failed to set up SINT route");
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
+static void vmbus_deinit(VMBus *vmbus)
+{
+ VMBusGpadl *gpadl, *tmp_gpadl;
+ VMBusChannel *chan;
+
+ QTAILQ_FOREACH_SAFE(gpadl, &vmbus->gpadl_list, link, tmp_gpadl) {
+ if (gpadl->state == VMGPADL_TORNDOWN) {
+ continue;
+ }
+ vmbus_put_gpadl(gpadl);
+ }
+
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ chan->offer_state = VMOFFER_INIT;
+ }
+
+ hyperv_sint_route_unref(vmbus->sint_route);
+ vmbus->sint_route = NULL;
+ vmbus->int_page_gpa = 0;
+ vmbus->target_vp = (uint32_t)-1;
+ vmbus->version = 0;
+ vmbus->state = VMBUS_LISTEN;
+ vmbus->msg_in_progress = false;
+}
+
+static void handle_initiate_contact(VMBus *vmbus,
+ vmbus_message_initiate_contact *msg,
+ uint32_t msglen)
+{
+ if (msglen < sizeof(*msg)) {
+ return;
+ }
+
+ trace_vmbus_initiate_contact(msg->version_requested >> 16,
+ msg->version_requested & 0xffff,
+ msg->target_vcpu, msg->monitor_page1,
+ msg->monitor_page2, msg->interrupt_page);
+
+ /*
+ * Reset vmbus on INITIATE_CONTACT regardless of its previous state.
+ * Useful, in particular, with vmbus-aware BIOS which can't shut vmbus down
+ * before handing over to OS loader.
+ */
+ vmbus_reset_all(vmbus);
+
+ vmbus->target_vp = msg->target_vcpu;
+ vmbus->version = msg->version_requested;
+ if (vmbus->version < VMBUS_VERSION_WIN8) {
+ /* linux passes interrupt page even when it doesn't need it */
+ vmbus->int_page_gpa = msg->interrupt_page;
+ }
+ vmbus->state = VMBUS_HANDSHAKE;
+
+ if (vmbus_init(vmbus)) {
+ error_report("failed to init vmbus; aborting");
+ vmbus_deinit(vmbus);
+ return;
+ }
+}
+
+static void send_handshake(VMBus *vmbus)
+{
+ struct vmbus_message_version_response msg = {
+ .header.message_type = VMBUS_MSG_VERSION_RESPONSE,
+ .version_supported = vmbus_initialized(vmbus),
+ };
+
+ post_msg(vmbus, &msg, sizeof(msg));
+}
+
+static void handle_request_offers(VMBus *vmbus, void *msgdata, uint32_t msglen)
+{
+ VMBusChannel *chan;
+
+ if (!vmbus_initialized(vmbus)) {
+ return;
+ }
+
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (chan->offer_state == VMOFFER_INIT) {
+ chan->offer_state = VMOFFER_SENDING;
+ break;
+ }
+ }
+
+ vmbus->state = VMBUS_OFFER;
+}
+
+static void send_offer(VMBus *vmbus)
+{
+ VMBusChannel *chan;
+ struct vmbus_message_header alloffers_msg = {
+ .message_type = VMBUS_MSG_ALLOFFERS_DELIVERED,
+ };
+
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (chan->offer_state == VMOFFER_SENDING) {
+ VMBusDeviceClass *vdc = VMBUS_DEVICE_GET_CLASS(chan->dev);
+ /* Hyper-V wants LE GUIDs */
+ QemuUUID classid = qemu_uuid_bswap(vdc->classid);
+ QemuUUID instanceid = qemu_uuid_bswap(chan->dev->instanceid);
+ struct vmbus_message_offer_channel msg = {
+ .header.message_type = VMBUS_MSG_OFFERCHANNEL,
+ .child_relid = chan->id,
+ .connection_id = chan_connection_id(chan),
+ .channel_flags = vdc->channel_flags,
+ .mmio_size_mb = vdc->mmio_size_mb,
+ .sub_channel_index = vmbus_channel_idx(chan),
+ .interrupt_flags = VMBUS_OFFER_INTERRUPT_DEDICATED,
+ };
+
+ memcpy(msg.type_uuid, &classid, sizeof(classid));
+ memcpy(msg.instance_uuid, &instanceid, sizeof(instanceid));
+
+ trace_vmbus_send_offer(chan->id, chan->dev);
+
+ post_msg(vmbus, &msg, sizeof(msg));
+ return;
+ }
+ }
+
+ /* no more offers, send terminator message */
+ trace_vmbus_terminate_offers();
+ post_msg(vmbus, &alloffers_msg, sizeof(alloffers_msg));
+}
+
+static bool complete_offer(VMBus *vmbus)
+{
+ VMBusChannel *chan;
+
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (chan->offer_state == VMOFFER_SENDING) {
+ chan->offer_state = VMOFFER_SENT;
+ goto next_offer;
+ }
+ }
+ /*
+ * no transitioning channels found so this is completing the terminator
+ * message, and vmbus can move to the next state
+ */
+ return true;
+
+next_offer:
+ /* try to mark another channel for offering */
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (chan->offer_state == VMOFFER_INIT) {
+ chan->offer_state = VMOFFER_SENDING;
+ break;
+ }
+ }
+ /*
+ * if an offer has been sent there are more offers or the terminator yet to
+ * send, so no state transition for vmbus
+ */
+ return false;
+}
+
+
+static void handle_gpadl_header(VMBus *vmbus, vmbus_message_gpadl_header *msg,
+ uint32_t msglen)
+{
+ VMBusGpadl *gpadl;
+ uint32_t num_gfns, i;
+
+ /* must include at least one gpa range */
+ if (msglen < sizeof(*msg) + sizeof(msg->range[0]) ||
+ !vmbus_initialized(vmbus)) {
+ return;
+ }
+
+ num_gfns = (msg->range_buflen - msg->rangecount * sizeof(msg->range[0])) /
+ sizeof(msg->range[0].pfn_array[0]);
+
+ trace_vmbus_gpadl_header(msg->gpadl_id, num_gfns);
+
+ /*
+ * In theory the GPADL_HEADER message can define a GPADL with multiple GPA
+ * ranges each with arbitrary size and alignment. However in practice only
+ * single-range page-aligned GPADLs have been observed so just ignore
+ * anything else and simplify things greatly.
+ */
+ if (msg->rangecount != 1 || msg->range[0].byte_offset ||
+ (msg->range[0].byte_count != (num_gfns << TARGET_PAGE_BITS))) {
+ return;
+ }
+
+ /* ignore requests to create already existing GPADLs */
+ if (find_gpadl(vmbus, msg->gpadl_id)) {
+ return;
+ }
+
+ gpadl = create_gpadl(vmbus, msg->gpadl_id, msg->child_relid, num_gfns);
+
+ for (i = 0; i < num_gfns &&
+ (void *)&msg->range[0].pfn_array[i + 1] <= (void *)msg + msglen;
+ i++) {
+ gpadl->gfns[gpadl->seen_gfns++] = msg->range[0].pfn_array[i];
+ }
+
+ if (gpadl_full(gpadl)) {
+ vmbus->state = VMBUS_CREATE_GPADL;
+ }
+}
+
+static void handle_gpadl_body(VMBus *vmbus, vmbus_message_gpadl_body *msg,
+ uint32_t msglen)
+{
+ VMBusGpadl *gpadl;
+ uint32_t num_gfns_left, i;
+
+ if (msglen < sizeof(*msg) || !vmbus_initialized(vmbus)) {
+ return;
+ }
+
+ trace_vmbus_gpadl_body(msg->gpadl_id);
+
+ gpadl = find_gpadl(vmbus, msg->gpadl_id);
+ if (!gpadl) {
+ return;
+ }
+
+ num_gfns_left = gpadl->num_gfns - gpadl->seen_gfns;
+ assert(num_gfns_left);
+
+ for (i = 0; i < num_gfns_left &&
+ (void *)&msg->pfn_array[i + 1] <= (void *)msg + msglen; i++) {
+ gpadl->gfns[gpadl->seen_gfns++] = msg->pfn_array[i];
+ }
+
+ if (gpadl_full(gpadl)) {
+ vmbus->state = VMBUS_CREATE_GPADL;
+ }
+}
+
+static void send_create_gpadl(VMBus *vmbus)
+{
+ VMBusGpadl *gpadl;
+
+ QTAILQ_FOREACH(gpadl, &vmbus->gpadl_list, link) {
+ if (gpadl_full(gpadl) && gpadl->state == VMGPADL_INIT) {
+ struct vmbus_message_gpadl_created msg = {
+ .header.message_type = VMBUS_MSG_GPADL_CREATED,
+ .gpadl_id = gpadl->id,
+ .child_relid = gpadl->child_relid,
+ };
+
+ trace_vmbus_gpadl_created(gpadl->id);
+ post_msg(vmbus, &msg, sizeof(msg));
+ return;
+ }
+ }
+
+ assert(false);
+}
+
+static bool complete_create_gpadl(VMBus *vmbus)
+{
+ VMBusGpadl *gpadl;
+
+ QTAILQ_FOREACH(gpadl, &vmbus->gpadl_list, link) {
+ if (gpadl_full(gpadl) && gpadl->state == VMGPADL_INIT) {
+ gpadl->state = VMGPADL_ALIVE;
+
+ return true;
+ }
+ }
+
+ assert(false);
+ return false;
+}
+
+static void handle_gpadl_teardown(VMBus *vmbus,
+ vmbus_message_gpadl_teardown *msg,
+ uint32_t msglen)
+{
+ VMBusGpadl *gpadl;
+
+ if (msglen < sizeof(*msg) || !vmbus_initialized(vmbus)) {
+ return;
+ }
+
+ trace_vmbus_gpadl_teardown(msg->gpadl_id);
+
+ gpadl = find_gpadl(vmbus, msg->gpadl_id);
+ if (!gpadl || gpadl->state == VMGPADL_TORNDOWN) {
+ return;
+ }
+
+ gpadl->state = VMGPADL_TEARINGDOWN;
+ vmbus->state = VMBUS_TEARDOWN_GPADL;
+}
+
+static void send_teardown_gpadl(VMBus *vmbus)
+{
+ VMBusGpadl *gpadl;
+
+ QTAILQ_FOREACH(gpadl, &vmbus->gpadl_list, link) {
+ if (gpadl->state == VMGPADL_TEARINGDOWN) {
+ struct vmbus_message_gpadl_torndown msg = {
+ .header.message_type = VMBUS_MSG_GPADL_TORNDOWN,
+ .gpadl_id = gpadl->id,
+ };
+
+ trace_vmbus_gpadl_torndown(gpadl->id);
+ post_msg(vmbus, &msg, sizeof(msg));
+ return;
+ }
+ }
+
+ assert(false);
+}
+
+static bool complete_teardown_gpadl(VMBus *vmbus)
+{
+ VMBusGpadl *gpadl;
+
+ QTAILQ_FOREACH(gpadl, &vmbus->gpadl_list, link) {
+ if (gpadl->state == VMGPADL_TEARINGDOWN) {
+ gpadl->state = VMGPADL_TORNDOWN;
+ vmbus_put_gpadl(gpadl);
+ return true;
+ }
+ }
+
+ assert(false);
+ return false;
+}
+
+static void handle_open_channel(VMBus *vmbus, vmbus_message_open_channel *msg,
+ uint32_t msglen)
+{
+ VMBusChannel *chan;
+
+ if (msglen < sizeof(*msg) || !vmbus_initialized(vmbus)) {
+ return;
+ }
+
+ trace_vmbus_open_channel(msg->child_relid, msg->ring_buffer_gpadl_id,
+ msg->target_vp);
+ chan = find_channel(vmbus, msg->child_relid);
+ if (!chan || chan->state != VMCHAN_INIT) {
+ return;
+ }
+
+ chan->ringbuf_gpadl = msg->ring_buffer_gpadl_id;
+ chan->ringbuf_send_offset = msg->ring_buffer_offset;
+ chan->target_vp = msg->target_vp;
+ chan->open_id = msg->open_id;
+
+ open_channel(chan);
+
+ chan->state = VMCHAN_OPENING;
+ vmbus->state = VMBUS_OPEN_CHANNEL;
+}
+
+static void send_open_channel(VMBus *vmbus)
+{
+ VMBusChannel *chan;
+
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (chan->state == VMCHAN_OPENING) {
+ struct vmbus_message_open_result msg = {
+ .header.message_type = VMBUS_MSG_OPENCHANNEL_RESULT,
+ .child_relid = chan->id,
+ .open_id = chan->open_id,
+ .status = !vmbus_channel_is_open(chan),
+ };
+
+ trace_vmbus_channel_open(chan->id, msg.status);
+ post_msg(vmbus, &msg, sizeof(msg));
+ return;
+ }
+ }
+
+ assert(false);
+}
+
+static bool complete_open_channel(VMBus *vmbus)
+{
+ VMBusChannel *chan;
+
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (chan->state == VMCHAN_OPENING) {
+ if (vmbus_channel_is_open(chan)) {
+ chan->state = VMCHAN_OPEN;
+ /*
+ * simulate guest notification of ringbuffer space made
+ * available, for the channel protocols where the host
+ * initiates the communication
+ */
+ vmbus_channel_notify_host(chan);
+ } else {
+ chan->state = VMCHAN_INIT;
+ }
+ return true;
+ }
+ }
+
+ assert(false);
+ return false;
+}
+
+static void vdev_reset_on_close(VMBusDevice *vdev)
+{
+ uint16_t i;
+
+ for (i = 0; i < vdev->num_channels; i++) {
+ if (vmbus_channel_is_open(&vdev->channels[i])) {
+ return;
+ }
+ }
+
+ /* all channels closed -- reset device */
+ qdev_reset_all(DEVICE(vdev));
+}
+
+static void handle_close_channel(VMBus *vmbus, vmbus_message_close_channel *msg,
+ uint32_t msglen)
+{
+ VMBusChannel *chan;
+
+ if (msglen < sizeof(*msg) || !vmbus_initialized(vmbus)) {
+ return;
+ }
+
+ trace_vmbus_close_channel(msg->child_relid);
+
+ chan = find_channel(vmbus, msg->child_relid);
+ if (!chan) {
+ return;
+ }
+
+ close_channel(chan);
+ chan->state = VMCHAN_INIT;
+
+ vdev_reset_on_close(chan->dev);
+}
+
+static void handle_unload(VMBus *vmbus, void *msg, uint32_t msglen)
+{
+ vmbus->state = VMBUS_UNLOAD;
+}
+
+static void send_unload(VMBus *vmbus)
+{
+ vmbus_message_header msg = {
+ .message_type = VMBUS_MSG_UNLOAD_RESPONSE,
+ };
+
+ qemu_mutex_lock(&vmbus->rx_queue_lock);
+ vmbus->rx_queue_size = 0;
+ qemu_mutex_unlock(&vmbus->rx_queue_lock);
+
+ post_msg(vmbus, &msg, sizeof(msg));
+ return;
+}
+
+static bool complete_unload(VMBus *vmbus)
+{
+ vmbus_reset_all(vmbus);
+ return true;
+}
+
+static void process_message(VMBus *vmbus)
+{
+ struct hyperv_post_message_input *hv_msg;
+ struct vmbus_message_header *msg;
+ void *msgdata;
+ uint32_t msglen;
+
+ qemu_mutex_lock(&vmbus->rx_queue_lock);
+
+ if (!vmbus->rx_queue_size) {
+ goto unlock;
+ }
+
+ hv_msg = &vmbus->rx_queue[vmbus->rx_queue_head];
+ msglen = hv_msg->payload_size;
+ if (msglen < sizeof(*msg)) {
+ goto out;
+ }
+ msgdata = hv_msg->payload;
+ msg = (struct vmbus_message_header *)msgdata;
+
+ trace_vmbus_process_incoming_message(msg->message_type);
+
+ switch (msg->message_type) {
+ case VMBUS_MSG_INITIATE_CONTACT:
+ handle_initiate_contact(vmbus, msgdata, msglen);
+ break;
+ case VMBUS_MSG_REQUESTOFFERS:
+ handle_request_offers(vmbus, msgdata, msglen);
+ break;
+ case VMBUS_MSG_GPADL_HEADER:
+ handle_gpadl_header(vmbus, msgdata, msglen);
+ break;
+ case VMBUS_MSG_GPADL_BODY:
+ handle_gpadl_body(vmbus, msgdata, msglen);
+ break;
+ case VMBUS_MSG_GPADL_TEARDOWN:
+ handle_gpadl_teardown(vmbus, msgdata, msglen);
+ break;
+ case VMBUS_MSG_OPENCHANNEL:
+ handle_open_channel(vmbus, msgdata, msglen);
+ break;
+ case VMBUS_MSG_CLOSECHANNEL:
+ handle_close_channel(vmbus, msgdata, msglen);
+ break;
+ case VMBUS_MSG_UNLOAD:
+ handle_unload(vmbus, msgdata, msglen);
+ break;
+ default:
+ error_report("unknown message type %#x", msg->message_type);
+ break;
+ }
+
+out:
+ vmbus->rx_queue_size--;
+ vmbus->rx_queue_head++;
+ vmbus->rx_queue_head %= HV_MSG_QUEUE_LEN;
+
+ vmbus_resched(vmbus);
+unlock:
+ qemu_mutex_unlock(&vmbus->rx_queue_lock);
+}
+
+static const struct {
+ void (*run)(VMBus *vmbus);
+ bool (*complete)(VMBus *vmbus);
+} state_runner[] = {
+ [VMBUS_LISTEN] = {process_message, NULL},
+ [VMBUS_HANDSHAKE] = {send_handshake, NULL},
+ [VMBUS_OFFER] = {send_offer, complete_offer},
+ [VMBUS_CREATE_GPADL] = {send_create_gpadl, complete_create_gpadl},
+ [VMBUS_TEARDOWN_GPADL] = {send_teardown_gpadl, complete_teardown_gpadl},
+ [VMBUS_OPEN_CHANNEL] = {send_open_channel, complete_open_channel},
+ [VMBUS_UNLOAD] = {send_unload, complete_unload},
+};
+
+static void vmbus_do_run(VMBus *vmbus)
+{
+ if (vmbus->msg_in_progress) {
+ return;
+ }
+
+ assert(vmbus->state < VMBUS_STATE_MAX);
+ assert(state_runner[vmbus->state].run);
+ state_runner[vmbus->state].run(vmbus);
+}
+
+static void vmbus_run(void *opaque)
+{
+ VMBus *vmbus = opaque;
+
+ /* make sure no recursion happens (e.g. due to recursive aio_poll()) */
+ if (vmbus->in_progress) {
+ return;
+ }
+
+ vmbus->in_progress = true;
+ /*
+ * FIXME: if vmbus_resched() is called from within vmbus_do_run(), it
+ * should go *after* the code that can result in aio_poll; otherwise
+ * reschedules can be missed. No idea how to enforce that.
+ */
+ vmbus_do_run(vmbus);
+ vmbus->in_progress = false;
+}
+
+static void vmbus_msg_cb(void *data, int status)
+{
+ VMBus *vmbus = data;
+ bool (*complete)(VMBus *vmbus);
+
+ assert(vmbus->msg_in_progress);
+
+ trace_vmbus_msg_cb(status);
+
+ if (status == -EAGAIN) {
+ goto out;
+ }
+ if (status) {
+ error_report("message delivery fatal failure: %d; aborting vmbus",
+ status);
+ vmbus_reset_all(vmbus);
+ return;
+ }
+
+ assert(vmbus->state < VMBUS_STATE_MAX);
+ complete = state_runner[vmbus->state].complete;
+ if (!complete || complete(vmbus)) {
+ vmbus->state = VMBUS_LISTEN;
+ }
+out:
+ vmbus->msg_in_progress = false;
+ vmbus_resched(vmbus);
+}
+
+static void vmbus_resched(VMBus *vmbus)
+{
+ aio_bh_schedule_oneshot(qemu_get_aio_context(), vmbus_run, vmbus);
+}
+
+static void vmbus_signal_event(EventNotifier *e)
+{
+ VMBusChannel *chan;
+ VMBus *vmbus = container_of(e, VMBus, notifier);
+ unsigned long *int_map;
+ hwaddr addr, len;
+ bool is_dirty = false;
+
+ if (!event_notifier_test_and_clear(e)) {
+ return;
+ }
+
+ trace_vmbus_signal_event();
+
+ if (!vmbus->int_page_gpa) {
+ return;
+ }
+
+ addr = vmbus->int_page_gpa + TARGET_PAGE_SIZE / 2;
+ len = TARGET_PAGE_SIZE / 2;
+ int_map = cpu_physical_memory_map(addr, &len, 1);
+ if (len != TARGET_PAGE_SIZE / 2) {
+ goto unmap;
+ }
+
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ if (bitmap_test_and_clear_atomic(int_map, chan->id, 1)) {
+ if (!vmbus_channel_is_open(chan)) {
+ continue;
+ }
+ vmbus_channel_notify_host(chan);
+ is_dirty = true;
+ }
+ }
+
+unmap:
+ cpu_physical_memory_unmap(int_map, len, 1, is_dirty);
+}
+
+static void vmbus_dev_realize(DeviceState *dev, Error **errp)
+{
+ VMBusDevice *vdev = VMBUS_DEVICE(dev);
+ VMBusDeviceClass *vdc = VMBUS_DEVICE_GET_CLASS(vdev);
+ VMBus *vmbus = VMBUS(qdev_get_parent_bus(dev));
+ BusChild *child;
+ Error *err = NULL;
+ char idstr[UUID_FMT_LEN + 1];
+
+ assert(!qemu_uuid_is_null(&vdev->instanceid));
+
+ /* Check for instance id collision for this class id */
+ QTAILQ_FOREACH(child, &BUS(vmbus)->children, sibling) {
+ VMBusDevice *child_dev = VMBUS_DEVICE(child->child);
+
+ if (child_dev == vdev) {
+ continue;
+ }
+
+ if (qemu_uuid_is_equal(&child_dev->instanceid, &vdev->instanceid)) {
+ qemu_uuid_unparse(&vdev->instanceid, idstr);
+ error_setg(&err, "duplicate vmbus device instance id %s", idstr);
+ goto error_out;
+ }
+ }
+
+ vdev->dma_as = &address_space_memory;
+
+ create_channels(vmbus, vdev, &err);
+ if (err) {
+ goto error_out;
+ }
+
+ if (vdc->vmdev_realize) {
+ vdc->vmdev_realize(vdev, &err);
+ if (err) {
+ goto err_vdc_realize;
+ }
+ }
+ return;
+
+err_vdc_realize:
+ free_channels(vdev);
+error_out:
+ error_propagate(errp, err);
+}
+
+static void vmbus_dev_reset(DeviceState *dev)
+{
+ uint16_t i;
+ VMBusDevice *vdev = VMBUS_DEVICE(dev);
+ VMBusDeviceClass *vdc = VMBUS_DEVICE_GET_CLASS(vdev);
+
+ if (vdev->channels) {
+ for (i = 0; i < vdev->num_channels; i++) {
+ VMBusChannel *chan = &vdev->channels[i];
+ close_channel(chan);
+ chan->state = VMCHAN_INIT;
+ }
+ }
+
+ if (vdc->vmdev_reset) {
+ vdc->vmdev_reset(vdev);
+ }
+}
+
+static void vmbus_dev_unrealize(DeviceState *dev, Error **errp)
+{
+ VMBusDevice *vdev = VMBUS_DEVICE(dev);
+ VMBusDeviceClass *vdc = VMBUS_DEVICE_GET_CLASS(vdev);
+
+ if (vdc->vmdev_unrealize) {
+ vdc->vmdev_unrealize(vdev, errp);
+ }
+ free_channels(vdev);
+}
+
+static void vmbus_dev_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *kdev = DEVICE_CLASS(klass);
+ kdev->bus_type = TYPE_VMBUS;
+ kdev->realize = vmbus_dev_realize;
+ kdev->unrealize = vmbus_dev_unrealize;
+ kdev->reset = vmbus_dev_reset;
+}
+
+static Property vmbus_dev_instanceid =
+ DEFINE_PROP_UUID("instanceid", VMBusDevice, instanceid);
+
+static void vmbus_dev_instance_init(Object *obj)
+{
+ VMBusDevice *vdev = VMBUS_DEVICE(obj);
+ VMBusDeviceClass *vdc = VMBUS_DEVICE_GET_CLASS(vdev);
+
+ if (!qemu_uuid_is_null(&vdc->instanceid)) {
+ /* Class wants to only have a single instance with a fixed UUID */
+ vdev->instanceid = vdc->instanceid;
+ } else {
+ qdev_property_add_static(DEVICE(vdev), &vmbus_dev_instanceid);
+ }
+}
+
+const VMStateDescription vmstate_vmbus_dev = {
+ .name = TYPE_VMBUS_DEVICE,
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8_ARRAY(instanceid.data, VMBusDevice, 16),
+ VMSTATE_UINT16(num_channels, VMBusDevice),
+ VMSTATE_STRUCT_VARRAY_POINTER_UINT16(channels, VMBusDevice,
+ num_channels, vmstate_channel,
+ VMBusChannel),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+/* vmbus generic device base */
+static const TypeInfo vmbus_dev_type_info = {
+ .name = TYPE_VMBUS_DEVICE,
+ .parent = TYPE_DEVICE,
+ .abstract = true,
+ .instance_size = sizeof(VMBusDevice),
+ .class_size = sizeof(VMBusDeviceClass),
+ .class_init = vmbus_dev_class_init,
+ .instance_init = vmbus_dev_instance_init,
+};
+
+static void vmbus_realize(BusState *bus, Error **errp)
+{
+ int ret = 0;
+ Error *local_err = NULL;
+ VMBus *vmbus = VMBUS(bus);
+
+ qemu_mutex_init(&vmbus->rx_queue_lock);
+
+ QTAILQ_INIT(&vmbus->gpadl_list);
+ QTAILQ_INIT(&vmbus->channel_list);
+
+ ret = hyperv_set_msg_handler(VMBUS_MESSAGE_CONNECTION_ID,
+ vmbus_recv_message, vmbus);
+ if (ret != 0) {
+ error_setg(&local_err, "hyperv set message handler failed: %d", ret);
+ goto error_out;
+ }
+
+ ret = event_notifier_init(&vmbus->notifier, 0);
+ if (ret != 0) {
+ error_setg(&local_err, "event notifier failed to init with %d", ret);
+ goto remove_msg_handler;
+ }
+
+ event_notifier_set_handler(&vmbus->notifier, vmbus_signal_event);
+ ret = hyperv_set_event_flag_handler(VMBUS_EVENT_CONNECTION_ID,
+ &vmbus->notifier);
+ if (ret != 0) {
+ error_setg(&local_err, "hyperv set event handler failed with %d", ret);
+ goto clear_event_notifier;
+ }
+
+ return;
+
+clear_event_notifier:
+ event_notifier_cleanup(&vmbus->notifier);
+remove_msg_handler:
+ hyperv_set_msg_handler(VMBUS_MESSAGE_CONNECTION_ID, NULL, NULL);
+error_out:
+ qemu_mutex_destroy(&vmbus->rx_queue_lock);
+ error_propagate(errp, local_err);
+}
+
+static void vmbus_unrealize(BusState *bus, Error **errp)
+{
+ VMBus *vmbus = VMBUS(bus);
+
+ hyperv_set_msg_handler(VMBUS_MESSAGE_CONNECTION_ID, NULL, NULL);
+ hyperv_set_event_flag_handler(VMBUS_EVENT_CONNECTION_ID, NULL);
+ event_notifier_cleanup(&vmbus->notifier);
+
+ qemu_mutex_destroy(&vmbus->rx_queue_lock);
+}
+
+static void vmbus_reset(BusState *bus)
+{
+ vmbus_deinit(VMBUS(bus));
+}
+
+static char *vmbus_get_dev_path(DeviceState *dev)
+{
+ BusState *bus = qdev_get_parent_bus(dev);
+ return qdev_get_dev_path(bus->parent);
+}
+
+static char *vmbus_get_fw_dev_path(DeviceState *dev)
+{
+ VMBusDevice *vdev = VMBUS_DEVICE(dev);
+ char uuid[UUID_FMT_LEN + 1];
+
+ qemu_uuid_unparse(&vdev->instanceid, uuid);
+ return g_strdup_printf("%s@%s", qdev_fw_name(dev), uuid);
+}
+
+static void vmbus_class_init(ObjectClass *klass, void *data)
+{
+ BusClass *k = BUS_CLASS(klass);
+
+ k->get_dev_path = vmbus_get_dev_path;
+ k->get_fw_dev_path = vmbus_get_fw_dev_path;
+ k->realize = vmbus_realize;
+ k->unrealize = vmbus_unrealize;
+ k->reset = vmbus_reset;
+}
+
+static int vmbus_pre_load(void *opaque)
+{
+ VMBusChannel *chan;
+ VMBus *vmbus = VMBUS(opaque);
+
+ /*
+ * channel IDs allocated by the source will come in the migration stream
+ * for each channel, so clean up the ones allocated at realize
+ */
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+ unregister_chan_id(chan);
+ }
+
+ return 0;
+}
+static int vmbus_post_load(void *opaque, int version_id)
+{
+ int ret;
+ VMBus *vmbus = VMBUS(opaque);
+ VMBusGpadl *gpadl;
+ VMBusChannel *chan;
+
+ ret = vmbus_init(vmbus);
+ if (ret) {
+ return ret;
+ }
+
+ QTAILQ_FOREACH(gpadl, &vmbus->gpadl_list, link) {
+ gpadl->vmbus = vmbus;
+ gpadl->refcount = 1;
+ }
+
+ /*
+ * reopening channels depends on initialized vmbus so it's done here
+ * instead of channel_post_load()
+ */
+ QTAILQ_FOREACH(chan, &vmbus->channel_list, link) {
+
+ if (chan->state == VMCHAN_OPENING || chan->state == VMCHAN_OPEN) {
+ open_channel(chan);
+ }
+
+ if (chan->state != VMCHAN_OPEN) {
+ continue;
+ }
+
+ if (!vmbus_channel_is_open(chan)) {
+ /* reopen failed, abort loading */
+ return -1;
+ }
+
+ /* resume processing on the guest side if it missed the notification */
+ hyperv_sint_route_set_sint(chan->notify_route);
+ /* ditto on the host side */
+ vmbus_channel_notify_host(chan);
+ }
+
+ vmbus_resched(vmbus);
+ return 0;
+}
+
+static const VMStateDescription vmstate_post_message_input = {
+ .name = "vmbus/hyperv_post_message_input",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ /*
+ * skip connection_id and message_type as they are validated before
+ * queueing and ignored on dequeueing
+ */
+ VMSTATE_UINT32(payload_size, struct hyperv_post_message_input),
+ VMSTATE_UINT8_ARRAY(payload, struct hyperv_post_message_input,
+ HV_MESSAGE_PAYLOAD_SIZE),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static bool vmbus_rx_queue_needed(void *opaque)
+{
+ VMBus *vmbus = VMBUS(opaque);
+ return vmbus->rx_queue_size;
+}
+
+static const VMStateDescription vmstate_rx_queue = {
+ .name = "vmbus/rx_queue",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .needed = vmbus_rx_queue_needed,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(rx_queue_head, VMBus),
+ VMSTATE_UINT8(rx_queue_size, VMBus),
+ VMSTATE_STRUCT_ARRAY(rx_queue, VMBus,
+ HV_MSG_QUEUE_LEN, 0,
+ vmstate_post_message_input,
+ struct hyperv_post_message_input),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static const VMStateDescription vmstate_vmbus = {
+ .name = TYPE_VMBUS,
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .pre_load = vmbus_pre_load,
+ .post_load = vmbus_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(state, VMBus),
+ VMSTATE_UINT32(version, VMBus),
+ VMSTATE_UINT32(target_vp, VMBus),
+ VMSTATE_UINT64(int_page_gpa, VMBus),
+ VMSTATE_QTAILQ_V(gpadl_list, VMBus, 0,
+ vmstate_gpadl, VMBusGpadl, link),
+ VMSTATE_END_OF_LIST()
+ },
+ .subsections = (const VMStateDescription * []) {
+ &vmstate_rx_queue,
+ NULL
+ }
+};
+
+static const TypeInfo vmbus_type_info = {
+ .name = TYPE_VMBUS,
+ .parent = TYPE_BUS,
+ .instance_size = sizeof(VMBus),
+ .class_init = vmbus_class_init,
+};
+
+static void vmbus_bridge_realize(DeviceState *dev, Error **errp)
+{
+ VMBusBridge *bridge = VMBUS_BRIDGE(dev);
+
+ /*
+ * here there's at least one vmbus bridge that is being realized, so
+ * vmbus_bridge_find can only return NULL if it's not unique
+ */
+ if (!vmbus_bridge_find()) {
+ error_setg(errp, "there can be at most one %s in the system",
+ TYPE_VMBUS_BRIDGE);
+ return;
+ }
+
+ if (!hyperv_is_synic_enabled()) {
+ error_report("VMBus requires usable Hyper-V SynIC and VP_INDEX");
+ return;
+ }
+
+ bridge->bus = VMBUS(qbus_create(TYPE_VMBUS, dev, "vmbus"));
+}
+
+static char *vmbus_bridge_ofw_unit_address(const SysBusDevice *dev)
+{
+ /* there can be only one VMBus */
+ return g_strdup("0");
+}
+
+static const VMStateDescription vmstate_vmbus_bridge = {
+ .name = TYPE_VMBUS_BRIDGE,
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ VMSTATE_STRUCT_POINTER(bus, VMBusBridge, vmstate_vmbus, VMBus),
+ VMSTATE_END_OF_LIST()
+ },
+};
+
+static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *k = DEVICE_CLASS(klass);
+ SysBusDeviceClass *sk = SYS_BUS_DEVICE_CLASS(klass);
+
+ k->realize = vmbus_bridge_realize;
+ k->fw_name = "vmbus";
+ sk->explicit_ofw_unit_address = vmbus_bridge_ofw_unit_address;
+ set_bit(DEVICE_CATEGORY_BRIDGE, k->categories);
+ k->vmsd = &vmstate_vmbus_bridge;
+ /* override SysBusDevice's default */
+ k->user_creatable = true;
+}
+
+static const TypeInfo vmbus_bridge_type_info = {
+ .name = TYPE_VMBUS_BRIDGE,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(VMBusBridge),
+ .class_init = vmbus_bridge_class_init,
+};
+
+static void vmbus_register_types(void)
+{
+ type_register_static(&vmbus_bridge_type_info);
+ type_register_static(&vmbus_dev_type_info);
+ type_register_static(&vmbus_type_info);
+}
+
+type_init(vmbus_register_types)
diff --git a/include/hw/hyperv/vmbus-bridge.h b/include/hw/hyperv/vmbus-bridge.h
new file mode 100644
index 0000000000..9cc8f780de
--- /dev/null
+++ b/include/hw/hyperv/vmbus-bridge.h
@@ -0,0 +1,32 @@
+/*
+ * QEMU Hyper-V VMBus root bridge
+ *
+ * Copyright (c) 2017-2018 Virtuozzo International GmbH.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_HYPERV_VMBUS_BRIDGE_H
+#define HW_HYPERV_VMBUS_BRIDGE_H
+
+#include "hw/sysbus.h"
+
+#define TYPE_VMBUS_BRIDGE "vmbus-bridge"
+
+typedef struct VMBus VMBus;
+
+typedef struct VMBusBridge {
+ SysBusDevice parent_obj;
+
+ VMBus *bus;
+} VMBusBridge;
+
+#define VMBUS_BRIDGE(obj) OBJECT_CHECK(VMBusBridge, (obj), TYPE_VMBUS_BRIDGE)
+
+static inline VMBusBridge *vmbus_bridge_find(void)
+{
+ return VMBUS_BRIDGE(object_resolve_path_type("", TYPE_VMBUS_BRIDGE, NULL));
+}
+
+#endif
diff --git a/include/hw/hyperv/vmbus.h b/include/hw/hyperv/vmbus.h
new file mode 100644
index 0000000000..63a5b807b6
--- /dev/null
+++ b/include/hw/hyperv/vmbus.h
@@ -0,0 +1,227 @@
+/*
+ * QEMU Hyper-V VMBus
+ *
+ * Copyright (c) 2017-2018 Virtuozzo International GmbH.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_HYPERV_VMBUS_H
+#define HW_HYPERV_VMBUS_H
+
+#include "sysemu/sysemu.h"
+#include "sysemu/dma.h"
+#include "hw/qdev-core.h"
+#include "migration/vmstate.h"
+#include "hw/hyperv/vmbus-proto.h"
+#include "qemu/uuid.h"
+
+#define TYPE_VMBUS_DEVICE "vmbus-dev"
+
+#define VMBUS_DEVICE(obj) \
+ OBJECT_CHECK(VMBusDevice, (obj), TYPE_VMBUS_DEVICE)
+#define VMBUS_DEVICE_CLASS(klass) \
+ OBJECT_CLASS_CHECK(VMBusDeviceClass, (klass), TYPE_VMBUS_DEVICE)
+#define VMBUS_DEVICE_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(VMBusDeviceClass, (obj), TYPE_VMBUS_DEVICE)
+
+/*
+ * Object wrapping a GPADL -- GPA Descriptor List -- an array of guest physical
+ * pages, to be used for various buffers shared between the host and the guest.
+ */
+typedef struct VMBusGpadl VMBusGpadl;
+/*
+ * VMBus channel -- a pair of ring buffers for either direction, placed within
+ * one GPADL, and the associated notification means.
+ */
+typedef struct VMBusChannel VMBusChannel;
+/*
+ * Base class for VMBus devices. Includes one or more channels. Identified by
+ * class GUID and instance GUID.
+ */
+typedef struct VMBusDevice VMBusDevice;
+
+typedef void(*VMBusChannelNotifyCb)(struct VMBusChannel *chan);
+
+typedef struct VMBusDeviceClass {
+ DeviceClass parent;
+
+ QemuUUID classid;
+ QemuUUID instanceid; /* Fixed UUID for singleton devices */
+ uint16_t channel_flags;
+ uint16_t mmio_size_mb;
+
+ /* Extentions to standard device callbacks */
+ void (*vmdev_realize)(VMBusDevice *vdev, Error **errp);
+ void (*vmdev_unrealize)(VMBusDevice *vdev, Error **errp);
+ void (*vmdev_reset)(VMBusDevice *vdev);
+ /*
+ * Calculate the number of channels based on the device properties. Called
+ * at realize time.
+ **/
+ uint16_t (*num_channels)(VMBusDevice *vdev);
+ /*
+ * Device-specific actions to complete the otherwise successful process of
+ * opening a channel.
+ * Return 0 on success, -errno on failure.
+ */
+ int (*open_channel)(VMBusChannel *chan);
+ /*
+ * Device-specific actions to perform before closing a channel.
+ */
+ void (*close_channel)(VMBusChannel *chan);
+ /*
+ * Main device worker; invoked in response to notifications from either
+ * side, when there's work to do with the data in the channel ring buffers.
+ */
+ VMBusChannelNotifyCb chan_notify_cb;
+} VMBusDeviceClass;
+
+struct VMBusDevice {
+ DeviceState parent;
+ QemuUUID instanceid;
+ uint16_t num_channels;
+ VMBusChannel *channels;
+ AddressSpace *dma_as;
+};
+
+extern const VMStateDescription vmstate_vmbus_dev;
+
+/*
+ * A unit of work parsed out of a message in the receive (i.e. guest->host)
+ * ring buffer of a channel. It's supposed to be subclassed (through
+ * embedding) by the specific devices.
+ */
+typedef struct VMBusChanReq {
+ VMBusChannel *chan;
+ uint16_t pkt_type;
+ uint32_t msglen;
+ void *msg;
+ uint64_t transaction_id;
+ bool need_comp;
+ QEMUSGList sgl;
+} VMBusChanReq;
+
+VMBusDevice *vmbus_channel_device(VMBusChannel *chan);
+VMBusChannel *vmbus_device_channel(VMBusDevice *dev, uint32_t chan_idx);
+uint32_t vmbus_channel_idx(VMBusChannel *chan);
+bool vmbus_channel_is_open(VMBusChannel *chan);
+
+/*
+ * Notify (on guest's behalf) the host side of the channel that there's data in
+ * the ringbuffer to process.
+ */
+void vmbus_channel_notify_host(VMBusChannel *chan);
+
+/*
+ * Reserve space for a packet in the send (i.e. host->guest) ringbuffer. If
+ * there isn't enough room, indicate that to the guest, to be notified when it
+ * becomes available.
+ * Return 0 on success, negative errno on failure.
+ * The ringbuffer indices are NOT updated, the requested space indicator may.
+ */
+int vmbus_channel_reserve(VMBusChannel *chan,
+ uint32_t desclen, uint32_t msglen);
+
+/*
+ * Send a packet to the guest. The space for the packet MUST be reserved
+ * first.
+ * Return total number of bytes placed in the send ringbuffer on success,
+ * negative errno on failure.
+ * The ringbuffer indices are updated on success, and the guest is signaled if
+ * needed.
+ */
+ssize_t vmbus_channel_send(VMBusChannel *chan, uint16_t pkt_type,
+ void *desc, uint32_t desclen,
+ void *msg, uint32_t msglen,
+ bool need_comp, uint64_t transaction_id);
+
+/*
+ * Prepare to fetch a batch of packets from the receive ring buffer.
+ * Return 0 on success, negative errno on failure.
+ */
+int vmbus_channel_recv_start(VMBusChannel *chan);
+
+/*
+ * Shortcut for a common case of sending a simple completion packet with no
+ * auxiliary descriptors.
+ */
+ssize_t vmbus_channel_send_completion(VMBusChanReq *req,
+ void *msg, uint32_t msglen);
+
+/*
+ * Peek at the receive (i.e. guest->host) ring buffer and extract a unit of
+ * work (a device-specific subclass of VMBusChanReq) from a packet if there's
+ * one.
+ * Return an allocated buffer, containing the request of @size with filled
+ * VMBusChanReq at the beginning, followed by the message payload, or NULL on
+ * failure.
+ * The ringbuffer indices are NOT updated, nor is the private copy of the read
+ * index.
+ */
+void *vmbus_channel_recv_peek(VMBusChannel *chan, uint32_t size);
+
+/*
+ * Update the private copy of the read index once the preceding peek is deemed
+ * successful.
+ * The ringbuffer indices are NOT updated.
+ */
+void vmbus_channel_recv_pop(VMBusChannel *chan);
+
+/*
+ * Propagate the private copy of the read index into the receive ring buffer,
+ * and thus complete the reception of a series of packets. Notify guest if
+ * needed.
+ * Return the number of bytes popped off the receive ring buffer by the
+ * preceding recv_peek/recv_pop calls on success, negative errno on failure.
+ */
+ssize_t vmbus_channel_recv_done(VMBusChannel *chan);
+
+/*
+ * Free the request allocated by vmbus_channel_recv_peek, together with its
+ * fields.
+ */
+void vmbus_free_req(void *req);
+
+/*
+ * Find and reference a GPADL by @gpadl_id.
+ * If not found return NULL.
+ */
+VMBusGpadl *vmbus_get_gpadl(VMBusChannel *chan, uint32_t gpadl_id);
+
+/*
+ * Unreference @gpadl. If the reference count drops to zero, free it.
+ * @gpadl may be NULL, in which case nothing is done.
+ */
+void vmbus_put_gpadl(VMBusGpadl *gpadl);
+
+/*
+ * Calculate total length in bytes of @gpadl.
+ * @gpadl must be valid.
+ */
+uint32_t vmbus_gpadl_len(VMBusGpadl *gpadl);
+
+/*
+ * Copy data from @iov to @gpadl at offset @off.
+ * Return the number of bytes copied, or a negative status on failure.
+ */
+ssize_t vmbus_iov_to_gpadl(VMBusChannel *chan, VMBusGpadl *gpadl, uint32_t off,
+ const struct iovec *iov, size_t iov_cnt);
+
+/*
+ * Map SGList contained in the request @req, at offset @off and no more than
+ * @len bytes, for io in direction @dir, and populate @iov with the mapped
+ * iovecs.
+ * Return the number of iovecs mapped, or negative status on failure.
+ */
+int vmbus_map_sgl(VMBusChanReq *req, DMADirection dir, struct iovec *iov,
+ unsigned iov_cnt, size_t len, size_t off);
+
+/*
+ * Unmap *iov mapped with vmbus_map_sgl, marking the number of bytes @accessed.
+ */
+void vmbus_unmap_sgl(VMBusChanReq *req, DMADirection dir, struct iovec *iov,
+ unsigned iov_cnt, size_t accessed);
+
+#endif
--
2.24.1
^ permalink raw reply related [flat|nested] 31+ messages in thread
* [PATCH v4 4/6] i386:pc: whitelist dynamic vmbus-bridge
2020-04-24 12:34 [PATCH v4 0/6] hyperv: VMBus implementation Jon Doron
` (2 preceding siblings ...)
2020-04-24 12:34 ` [PATCH v4 3/6] vmbus: vmbus implementation Jon Doron
@ 2020-04-24 12:34 ` Jon Doron
2020-04-24 12:34 ` [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry Jon Doron
` (2 subsequent siblings)
6 siblings, 0 replies; 31+ messages in thread
From: Jon Doron @ 2020-04-24 12:34 UTC (permalink / raw)
To: qemu-devel
Cc: mail, eyakovlev, ehabkost, rvkagan, liran.alon, Roman Kagan,
pbonzini, vkuznets, Maciej S . Szmigiero, Jon Doron
As vmbus-bridge is derived from sysbus device, it has to be whitelisted
to be allowed to be created with -device.
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Signed-off-by: Jon Doron <arilou@gmail.com>
---
hw/i386/pc_piix.c | 2 ++
hw/i386/pc_q35.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 9cceae3e2c..6daa0770fa 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -60,6 +60,7 @@
#include "migration/global_state.h"
#include "migration/misc.h"
#include "sysemu/numa.h"
+#include "hw/hyperv/vmbus-bridge.h"
#include "hw/mem/nvdimm.h"
#define MAX_IDE_BUS 2
@@ -417,6 +418,7 @@ static void pc_i440fx_machine_options(MachineClass *m)
m->default_machine_opts = "firmware=bios-256k.bin";
m->default_display = "std";
machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE);
+ machine_class_allow_dynamic_sysbus_dev(m, TYPE_VMBUS_BRIDGE);
}
static void pc_i440fx_5_0_machine_options(MachineClass *m)
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index d37c425e22..faaa39ced2 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -53,6 +53,7 @@
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "sysemu/numa.h"
+#include "hw/hyperv/vmbus-bridge.h"
#include "hw/mem/nvdimm.h"
/* ICH9 AHCI has 6 ports */
@@ -346,6 +347,7 @@ static void pc_q35_machine_options(MachineClass *m)
machine_class_allow_dynamic_sysbus_dev(m, TYPE_AMD_IOMMU_DEVICE);
machine_class_allow_dynamic_sysbus_dev(m, TYPE_INTEL_IOMMU_DEVICE);
machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE);
+ machine_class_allow_dynamic_sysbus_dev(m, TYPE_VMBUS_BRIDGE);
m->max_cpus = 288;
}
--
2.24.1
^ permalink raw reply related [flat|nested] 31+ messages in thread
* [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-04-24 12:34 [PATCH v4 0/6] hyperv: VMBus implementation Jon Doron
` (3 preceding siblings ...)
2020-04-24 12:34 ` [PATCH v4 4/6] i386:pc: whitelist dynamic vmbus-bridge Jon Doron
@ 2020-04-24 12:34 ` Jon Doron
2020-05-05 13:06 ` Igor Mammedov
2020-04-24 12:34 ` [PATCH v4 6/6] vmbus: add infrastructure to save/load vmbus requests Jon Doron
2020-05-21 16:03 ` [PATCH v4 0/6] hyperv: VMBus implementation Paolo Bonzini
6 siblings, 1 reply; 31+ messages in thread
From: Jon Doron @ 2020-04-24 12:34 UTC (permalink / raw)
To: qemu-devel
Cc: mail, eyakovlev, ehabkost, rvkagan, liran.alon, Roman Kagan,
pbonzini, vkuznets, Maciej S . Szmigiero, Jon Doron
Guest OS uses ACPI to discover VMBus presence. Add a corresponding
entry to DSDT in case VMBus has been enabled.
Experimentally Windows guests were found to require this entry to
include two IRQ resources. They seem to never be used but they still
have to be there.
Make IRQ numbers user-configurable via corresponding properties; use 7
and 13 by default.
Signed-off-by: Evgeny Yakovlev <eyakovlev@virtuozzo.com>
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Signed-off-by: Jon Doron <arilou@gmail.com>
---
hw/hyperv/vmbus.c | 7 ++++++
hw/i386/acpi-build.c | 43 ++++++++++++++++++++++++++++++++
include/hw/hyperv/vmbus-bridge.h | 3 +++
3 files changed, 53 insertions(+)
diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
index 1f5873ab60..0df7afe0ca 100644
--- a/hw/hyperv/vmbus.c
+++ b/hw/hyperv/vmbus.c
@@ -2641,6 +2641,12 @@ static const VMStateDescription vmstate_vmbus_bridge = {
},
};
+static Property vmbus_bridge_props[] = {
+ DEFINE_PROP_UINT8("irq0", VMBusBridge, irq0, 7),
+ DEFINE_PROP_UINT8("irq1", VMBusBridge, irq1, 13),
+ DEFINE_PROP_END_OF_LIST()
+};
+
static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
@@ -2651,6 +2657,7 @@ static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
sk->explicit_ofw_unit_address = vmbus_bridge_ofw_unit_address;
set_bit(DEVICE_CATEGORY_BRIDGE, k->categories);
k->vmsd = &vmstate_vmbus_bridge;
+ device_class_set_props(k, vmbus_bridge_props);
/* override SysBusDevice's default */
k->user_creatable = true;
}
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 2a7e55bae7..d235074fb8 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -50,6 +50,7 @@
#include "hw/mem/nvdimm.h"
#include "sysemu/numa.h"
#include "sysemu/reset.h"
+#include "hw/hyperv/vmbus-bridge.h"
/* Supported chipsets: */
#include "hw/southbridge/piix.h"
@@ -1270,9 +1271,47 @@ static Aml *build_com_device_aml(uint8_t uid)
return dev;
}
+static Aml *build_vmbus_device_aml(VMBusBridge *vmbus_bridge)
+{
+ Aml *dev;
+ Aml *method;
+ Aml *crs;
+
+ dev = aml_device("VMBS");
+ aml_append(dev, aml_name_decl("STA", aml_int(0xF)));
+ aml_append(dev, aml_name_decl("_HID", aml_string("VMBus")));
+ aml_append(dev, aml_name_decl("_UID", aml_int(0x0)));
+ aml_append(dev, aml_name_decl("_DDN", aml_string("VMBUS")));
+
+ method = aml_method("_DIS", 0, AML_NOTSERIALIZED);
+ aml_append(method, aml_store(aml_and(aml_name("STA"), aml_int(0xD), NULL),
+ aml_name("STA")));
+ aml_append(dev, method);
+
+ method = aml_method("_PS0", 0, AML_NOTSERIALIZED);
+ aml_append(method, aml_store(aml_or(aml_name("STA"), aml_int(0xF), NULL),
+ aml_name("STA")));
+ aml_append(dev, method);
+
+ method = aml_method("_STA", 0, AML_NOTSERIALIZED);
+ aml_append(method, aml_return(aml_name("STA")));
+ aml_append(dev, method);
+
+ aml_append(dev, aml_name_decl("_PS3", aml_int(0x0)));
+
+ crs = aml_resource_template();
+ aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq0));
+ /* FIXME: newer HyperV gets by with only one IRQ */
+ aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq1));
+ aml_append(dev, aml_name_decl("_CRS", crs));
+
+ return dev;
+}
+
static void build_isa_devices_aml(Aml *table)
{
ISADevice *fdc = pc_find_fdc0();
+ VMBusBridge *vmbus_bridge = vmbus_bridge_find();
bool ambiguous;
Aml *scope = aml_scope("_SB.PCI0.ISA");
@@ -1296,6 +1335,10 @@ static void build_isa_devices_aml(Aml *table)
build_acpi_ipmi_devices(scope, BUS(obj), "\\_SB.PCI0.ISA");
}
+ if (vmbus_bridge) {
+ aml_append(scope, build_vmbus_device_aml(vmbus_bridge));
+ }
+
aml_append(table, scope);
}
diff --git a/include/hw/hyperv/vmbus-bridge.h b/include/hw/hyperv/vmbus-bridge.h
index 9cc8f780de..c0a06d832c 100644
--- a/include/hw/hyperv/vmbus-bridge.h
+++ b/include/hw/hyperv/vmbus-bridge.h
@@ -19,6 +19,9 @@ typedef struct VMBus VMBus;
typedef struct VMBusBridge {
SysBusDevice parent_obj;
+ uint8_t irq0;
+ uint8_t irq1;
+
VMBus *bus;
} VMBusBridge;
--
2.24.1
^ permalink raw reply related [flat|nested] 31+ messages in thread
* [PATCH v4 6/6] vmbus: add infrastructure to save/load vmbus requests
2020-04-24 12:34 [PATCH v4 0/6] hyperv: VMBus implementation Jon Doron
` (4 preceding siblings ...)
2020-04-24 12:34 ` [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry Jon Doron
@ 2020-04-24 12:34 ` Jon Doron
2020-05-21 16:03 ` [PATCH v4 0/6] hyperv: VMBus implementation Paolo Bonzini
6 siblings, 0 replies; 31+ messages in thread
From: Jon Doron @ 2020-04-24 12:34 UTC (permalink / raw)
To: qemu-devel
Cc: mail, eyakovlev, ehabkost, rvkagan, liran.alon, Roman Kagan,
pbonzini, vkuznets, Maciej S . Szmigiero, Jon Doron
This can be allow to include controller-specific data while
saving/loading in-flight scsi requests of the vmbus scsi controller.
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Signed-off-by: Jon Doron <arilou@gmail.com>
---
hw/hyperv/vmbus.c | 99 +++++++++++++++++++++++++++++++++++++++
include/hw/hyperv/vmbus.h | 3 ++
2 files changed, 102 insertions(+)
diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
index 0df7afe0ca..ab72a59a4a 100644
--- a/hw/hyperv/vmbus.c
+++ b/hw/hyperv/vmbus.c
@@ -1272,6 +1272,105 @@ void vmbus_free_req(void *req)
g_free(req);
}
+static const VMStateDescription vmstate_sgent = {
+ .name = "vmbus/sgentry",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT64(base, ScatterGatherEntry),
+ VMSTATE_UINT64(len, ScatterGatherEntry),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+typedef struct VMBusChanReqSave {
+ uint16_t chan_idx;
+ uint16_t pkt_type;
+ uint32_t msglen;
+ void *msg;
+ uint64_t transaction_id;
+ bool need_comp;
+ uint32_t num;
+ ScatterGatherEntry *sgl;
+} VMBusChanReqSave;
+
+static const VMStateDescription vmstate_vmbus_chan_req = {
+ .name = "vmbus/vmbus_chan_req",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT16(chan_idx, VMBusChanReqSave),
+ VMSTATE_UINT16(pkt_type, VMBusChanReqSave),
+ VMSTATE_UINT32(msglen, VMBusChanReqSave),
+ VMSTATE_VBUFFER_ALLOC_UINT32(msg, VMBusChanReqSave, 0, NULL, msglen),
+ VMSTATE_UINT64(transaction_id, VMBusChanReqSave),
+ VMSTATE_BOOL(need_comp, VMBusChanReqSave),
+ VMSTATE_UINT32(num, VMBusChanReqSave),
+ VMSTATE_STRUCT_VARRAY_POINTER_UINT32(sgl, VMBusChanReqSave, num,
+ vmstate_sgent, ScatterGatherEntry),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+void vmbus_save_req(QEMUFile *f, VMBusChanReq *req)
+{
+ VMBusChanReqSave req_save;
+
+ req_save.chan_idx = req->chan->subchan_idx;
+ req_save.pkt_type = req->pkt_type;
+ req_save.msglen = req->msglen;
+ req_save.msg = req->msg;
+ req_save.transaction_id = req->transaction_id;
+ req_save.need_comp = req->need_comp;
+ req_save.num = req->sgl.nsg;
+ req_save.sgl = g_memdup(req->sgl.sg,
+ req_save.num * sizeof(ScatterGatherEntry));
+
+ vmstate_save_state(f, &vmstate_vmbus_chan_req, &req_save, NULL);
+
+ g_free(req_save.sgl);
+}
+
+void *vmbus_load_req(QEMUFile *f, VMBusDevice *dev, uint32_t size)
+{
+ VMBusChanReqSave req_save;
+ VMBusChanReq *req = NULL;
+ VMBusChannel *chan = NULL;
+ uint32_t i;
+
+ vmstate_load_state(f, &vmstate_vmbus_chan_req, &req_save, 0);
+
+ if (req_save.chan_idx >= dev->num_channels) {
+ error_report("%s: %u(chan_idx) > %u(num_channels)", __func__,
+ req_save.chan_idx, dev->num_channels);
+ goto out;
+ }
+ chan = &dev->channels[req_save.chan_idx];
+
+ if (vmbus_channel_reserve(chan, 0, req_save.msglen)) {
+ goto out;
+ }
+
+ req = vmbus_alloc_req(chan, size, req_save.pkt_type, req_save.msglen,
+ req_save.transaction_id, req_save.need_comp);
+ if (req_save.msglen) {
+ memcpy(req->msg, req_save.msg, req_save.msglen);
+ }
+
+ for (i = 0; i < req_save.num; i++) {
+ qemu_sglist_add(&req->sgl, req_save.sgl[i].base, req_save.sgl[i].len);
+ }
+
+out:
+ if (req_save.msglen) {
+ g_free(req_save.msg);
+ }
+ if (req_save.num) {
+ g_free(req_save.sgl);
+ }
+ return req;
+}
+
static void channel_event_cb(EventNotifier *e)
{
VMBusChannel *chan = container_of(e, VMBusChannel, notifier);
diff --git a/include/hw/hyperv/vmbus.h b/include/hw/hyperv/vmbus.h
index 63a5b807b6..9219f34d6b 100644
--- a/include/hw/hyperv/vmbus.h
+++ b/include/hw/hyperv/vmbus.h
@@ -224,4 +224,7 @@ int vmbus_map_sgl(VMBusChanReq *req, DMADirection dir, struct iovec *iov,
void vmbus_unmap_sgl(VMBusChanReq *req, DMADirection dir, struct iovec *iov,
unsigned iov_cnt, size_t accessed);
+void vmbus_save_req(QEMUFile *f, VMBusChanReq *req);
+void *vmbus_load_req(QEMUFile *f, VMBusDevice *dev, uint32_t size);
+
#endif
--
2.24.1
^ permalink raw reply related [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-04-24 12:34 ` [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry Jon Doron
@ 2020-05-05 13:06 ` Igor Mammedov
2020-05-05 15:38 ` Jon Doron
2020-05-11 18:21 ` Roman Kagan
0 siblings, 2 replies; 31+ messages in thread
From: Igor Mammedov @ 2020-05-05 13:06 UTC (permalink / raw)
To: Jon Doron
Cc: mail, eyakovlev, ehabkost, rvkagan, qemu-devel, liran.alon,
Roman Kagan, pbonzini, vkuznets, Maciej S . Szmigiero
On Fri, 24 Apr 2020 15:34:43 +0300
Jon Doron <arilou@gmail.com> wrote:
> Guest OS uses ACPI to discover VMBus presence. Add a corresponding
> entry to DSDT in case VMBus has been enabled.
>
> Experimentally Windows guests were found to require this entry to
> include two IRQ resources. They seem to never be used but they still
> have to be there.
>
> Make IRQ numbers user-configurable via corresponding properties; use 7
> and 13 by default.
well, it seems that at least linux guest driver uses one IRQ,
abeit not from ACPI descriptior
perhaps it's what hyperv host puts into _CRS.
Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
also what if vmbus irq collides with an irq that is already taken,
it would be better to initialize and consume irqs it climes to use
so in case if conflict one would get a error.
> Signed-off-by: Evgeny Yakovlev <eyakovlev@virtuozzo.com>
> Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
> Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
> Signed-off-by: Jon Doron <arilou@gmail.com>
> ---
> hw/hyperv/vmbus.c | 7 ++++++
> hw/i386/acpi-build.c | 43 ++++++++++++++++++++++++++++++++
> include/hw/hyperv/vmbus-bridge.h | 3 +++
> 3 files changed, 53 insertions(+)
>
> diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
> index 1f5873ab60..0df7afe0ca 100644
> --- a/hw/hyperv/vmbus.c
> +++ b/hw/hyperv/vmbus.c
> @@ -2641,6 +2641,12 @@ static const VMStateDescription vmstate_vmbus_bridge = {
> },
> };
>
> +static Property vmbus_bridge_props[] = {
> + DEFINE_PROP_UINT8("irq0", VMBusBridge, irq0, 7),
> + DEFINE_PROP_UINT8("irq1", VMBusBridge, irq1, 13),
> + DEFINE_PROP_END_OF_LIST()
> +};
> +
> static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
> {
> DeviceClass *k = DEVICE_CLASS(klass);
> @@ -2651,6 +2657,7 @@ static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
> sk->explicit_ofw_unit_address = vmbus_bridge_ofw_unit_address;
> set_bit(DEVICE_CATEGORY_BRIDGE, k->categories);
> k->vmsd = &vmstate_vmbus_bridge;
> + device_class_set_props(k, vmbus_bridge_props);
> /* override SysBusDevice's default */
> k->user_creatable = true;
> }
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 2a7e55bae7..d235074fb8 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -50,6 +50,7 @@
> #include "hw/mem/nvdimm.h"
> #include "sysemu/numa.h"
> #include "sysemu/reset.h"
> +#include "hw/hyperv/vmbus-bridge.h"
>
> /* Supported chipsets: */
> #include "hw/southbridge/piix.h"
> @@ -1270,9 +1271,47 @@ static Aml *build_com_device_aml(uint8_t uid)
> return dev;
> }
>
> +static Aml *build_vmbus_device_aml(VMBusBridge *vmbus_bridge)
> +{
> + Aml *dev;
> + Aml *method;
> + Aml *crs;
> +
> + dev = aml_device("VMBS");
> + aml_append(dev, aml_name_decl("STA", aml_int(0xF)));
> + aml_append(dev, aml_name_decl("_HID", aml_string("VMBus")));
> + aml_append(dev, aml_name_decl("_UID", aml_int(0x0)));
> + aml_append(dev, aml_name_decl("_DDN", aml_string("VMBUS")));
> +
> + method = aml_method("_DIS", 0, AML_NOTSERIALIZED);
> + aml_append(method, aml_store(aml_and(aml_name("STA"), aml_int(0xD), NULL),
> + aml_name("STA")));
> + aml_append(dev, method);
> +
> + method = aml_method("_PS0", 0, AML_NOTSERIALIZED);
> + aml_append(method, aml_store(aml_or(aml_name("STA"), aml_int(0xF), NULL),
> + aml_name("STA")));
> + aml_append(dev, method);
> +
> + method = aml_method("_STA", 0, AML_NOTSERIALIZED);
> + aml_append(method, aml_return(aml_name("STA")));
> + aml_append(dev, method);
do you reaaly need all that _STA/_DIS/_PS0,
does it work without thouse methods?
> +
> + aml_append(dev, aml_name_decl("_PS3", aml_int(0x0)));
should be method
> +
> + crs = aml_resource_template();
> + aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq0));
> + /* FIXME: newer HyperV gets by with only one IRQ */
then why are you adding the second IRQ, does it work with 1 IRQ?
> + aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq1));
> + aml_append(dev, aml_name_decl("_CRS", crs));
> +
> + return dev;
> +}
> +
> static void build_isa_devices_aml(Aml *table)
> {
> ISADevice *fdc = pc_find_fdc0();
> + VMBusBridge *vmbus_bridge = vmbus_bridge_find();
> bool ambiguous;
>
> Aml *scope = aml_scope("_SB.PCI0.ISA");
> @@ -1296,6 +1335,10 @@ static void build_isa_devices_aml(Aml *table)
> build_acpi_ipmi_devices(scope, BUS(obj), "\\_SB.PCI0.ISA");
> }
>
> + if (vmbus_bridge) {
> + aml_append(scope, build_vmbus_device_aml(vmbus_bridge));
> + }
it seems that bridge is sysbus device, why it's put under ISA bus?
> aml_append(table, scope);
> }
>
> diff --git a/include/hw/hyperv/vmbus-bridge.h b/include/hw/hyperv/vmbus-bridge.h
> index 9cc8f780de..c0a06d832c 100644
> --- a/include/hw/hyperv/vmbus-bridge.h
> +++ b/include/hw/hyperv/vmbus-bridge.h
> @@ -19,6 +19,9 @@ typedef struct VMBus VMBus;
> typedef struct VMBusBridge {
> SysBusDevice parent_obj;
>
> + uint8_t irq0;
> + uint8_t irq1;
> +
> VMBus *bus;
> } VMBusBridge;
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-05 13:06 ` Igor Mammedov
@ 2020-05-05 15:38 ` Jon Doron
2020-05-06 13:37 ` Maciej S. Szmigiero
2020-05-11 18:21 ` Roman Kagan
1 sibling, 1 reply; 31+ messages in thread
From: Jon Doron @ 2020-05-05 15:38 UTC (permalink / raw)
To: Igor Mammedov
Cc: mail, eyakovlev, ehabkost, rvkagan, qemu-devel, liran.alon,
Roman Kagan, pbonzini, vkuznets, Maciej S . Szmigiero
On 05/05/2020, Igor Mammedov wrote:
I dont know what were the original intentions of the original patch
authors (at this point I simply rebased it, and to be honest I did not
need this patch to get where I was going to, but it was part of the
original patchset).
But I'm willing to do any changes so we can keep going forward with
this.
>On Fri, 24 Apr 2020 15:34:43 +0300
>Jon Doron <arilou@gmail.com> wrote:
>
>> Guest OS uses ACPI to discover VMBus presence. Add a corresponding
>> entry to DSDT in case VMBus has been enabled.
>>
>> Experimentally Windows guests were found to require this entry to
>> include two IRQ resources. They seem to never be used but they still
>> have to be there.
>>
>> Make IRQ numbers user-configurable via corresponding properties; use 7
>> and 13 by default.
>well, it seems that at least linux guest driver uses one IRQ,
>abeit not from ACPI descriptior
>
>perhaps it's what hyperv host puts into _CRS.
>Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
>
>
I can no longer get to the HyperV computer I had (in the office so
hopefully if someone else has access to HyperV machine and willing to
reply here with the dumped ACPI tables that would be great).
>also what if vmbus irq collides with an irq that is already taken,
>it would be better to initialize and consume irqs it climes to use
>so in case if conflict one would get a error.
>
Sounds right. I tried to see if there is any place in acpi that checks
if an IRQ is taken or not but could not find any, can you point me out
to a place where it's done?
If not then I guess we need a function that iterates through all
registered IRQs so we can find if we have a conflict.
Probably the best places to put it is where you build the acpi aml, but
that would really make the code more complicated (i.e
build_append_int_noprefix and aml_interrupt).
In case I have not understood you right please let me know.
>> Signed-off-by: Evgeny Yakovlev <eyakovlev@virtuozzo.com>
>> Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
>> Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
>> Signed-off-by: Jon Doron <arilou@gmail.com>
>> ---
>> hw/hyperv/vmbus.c | 7 ++++++
>> hw/i386/acpi-build.c | 43 ++++++++++++++++++++++++++++++++
>> include/hw/hyperv/vmbus-bridge.h | 3 +++
>> 3 files changed, 53 insertions(+)
>>
>> diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
>> index 1f5873ab60..0df7afe0ca 100644
>> --- a/hw/hyperv/vmbus.c
>> +++ b/hw/hyperv/vmbus.c
>> @@ -2641,6 +2641,12 @@ static const VMStateDescription vmstate_vmbus_bridge = {
>> },
>> };
>>
>> +static Property vmbus_bridge_props[] = {
>> + DEFINE_PROP_UINT8("irq0", VMBusBridge, irq0, 7),
>> + DEFINE_PROP_UINT8("irq1", VMBusBridge, irq1, 13),
>> + DEFINE_PROP_END_OF_LIST()
>> +};
>> +
>> static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
>> {
>> DeviceClass *k = DEVICE_CLASS(klass);
>> @@ -2651,6 +2657,7 @@ static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
>> sk->explicit_ofw_unit_address = vmbus_bridge_ofw_unit_address;
>> set_bit(DEVICE_CATEGORY_BRIDGE, k->categories);
>> k->vmsd = &vmstate_vmbus_bridge;
>> + device_class_set_props(k, vmbus_bridge_props);
>> /* override SysBusDevice's default */
>> k->user_creatable = true;
>> }
>> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
>> index 2a7e55bae7..d235074fb8 100644
>> --- a/hw/i386/acpi-build.c
>> +++ b/hw/i386/acpi-build.c
>> @@ -50,6 +50,7 @@
>> #include "hw/mem/nvdimm.h"
>> #include "sysemu/numa.h"
>> #include "sysemu/reset.h"
>> +#include "hw/hyperv/vmbus-bridge.h"
>>
>> /* Supported chipsets: */
>> #include "hw/southbridge/piix.h"
>> @@ -1270,9 +1271,47 @@ static Aml *build_com_device_aml(uint8_t uid)
>> return dev;
>> }
>>
>> +static Aml *build_vmbus_device_aml(VMBusBridge *vmbus_bridge)
>> +{
>> + Aml *dev;
>> + Aml *method;
>> + Aml *crs;
>> +
>> + dev = aml_device("VMBS");
>> + aml_append(dev, aml_name_decl("STA", aml_int(0xF)));
>> + aml_append(dev, aml_name_decl("_HID", aml_string("VMBus")));
>> + aml_append(dev, aml_name_decl("_UID", aml_int(0x0)));
>> + aml_append(dev, aml_name_decl("_DDN", aml_string("VMBUS")));
>> +
>> + method = aml_method("_DIS", 0, AML_NOTSERIALIZED);
>> + aml_append(method, aml_store(aml_and(aml_name("STA"), aml_int(0xD), NULL),
>> + aml_name("STA")));
>> + aml_append(dev, method);
>> +
>> + method = aml_method("_PS0", 0, AML_NOTSERIALIZED);
>> + aml_append(method, aml_store(aml_or(aml_name("STA"), aml_int(0xF), NULL),
>> + aml_name("STA")));
>> + aml_append(dev, method);
>> +
>> + method = aml_method("_STA", 0, AML_NOTSERIALIZED);
>> + aml_append(method, aml_return(aml_name("STA")));
>> + aml_append(dev, method);
>
>do you reaaly need all that _STA/_DIS/_PS0,
>does it work without thouse methods?
>
>> +
>> + aml_append(dev, aml_name_decl("_PS3", aml_int(0x0)));
>should be method
>
>> +
>> + crs = aml_resource_template();
>> + aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq0));
>> + /* FIXME: newer HyperV gets by with only one IRQ */
>then why are you adding the second IRQ, does it work with 1 IRQ?
>
>> + aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq1));
>> + aml_append(dev, aml_name_decl("_CRS", crs));
>> +
>> + return dev;
>> +}
>> +
>> static void build_isa_devices_aml(Aml *table)
>> {
>> ISADevice *fdc = pc_find_fdc0();
>> + VMBusBridge *vmbus_bridge = vmbus_bridge_find();
>> bool ambiguous;
>>
>> Aml *scope = aml_scope("_SB.PCI0.ISA");
>> @@ -1296,6 +1335,10 @@ static void build_isa_devices_aml(Aml *table)
>> build_acpi_ipmi_devices(scope, BUS(obj), "\\_SB.PCI0.ISA");
>> }
>>
>> + if (vmbus_bridge) {
>> + aml_append(scope, build_vmbus_device_aml(vmbus_bridge));
>> + }
>it seems that bridge is sysbus device, why it's put under ISA bus?
>
That's where the original author put it, where would you prefer it will
go?
>> aml_append(table, scope);
>> }
>>
>> diff --git a/include/hw/hyperv/vmbus-bridge.h b/include/hw/hyperv/vmbus-bridge.h
>> index 9cc8f780de..c0a06d832c 100644
>> --- a/include/hw/hyperv/vmbus-bridge.h
>> +++ b/include/hw/hyperv/vmbus-bridge.h
>> @@ -19,6 +19,9 @@ typedef struct VMBus VMBus;
>> typedef struct VMBusBridge {
>> SysBusDevice parent_obj;
>>
>> + uint8_t irq0;
>> + uint8_t irq1;
>> +
>> VMBus *bus;
>> } VMBusBridge;
>>
>
For your other questions I have no clue like I said I have only rebased
the latest revision (which was about 1-2 years old).
-- Jon.
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-05 15:38 ` Jon Doron
@ 2020-05-06 13:37 ` Maciej S. Szmigiero
2020-05-07 3:14 ` Jon Doron
0 siblings, 1 reply; 31+ messages in thread
From: Maciej S. Szmigiero @ 2020-05-06 13:37 UTC (permalink / raw)
To: Igor Mammedov
Cc: eyakovlev, Jon Doron, rvkagan, qemu-devel, liran.alon,
Roman Kagan, pbonzini, vkuznets, ehabkost
On 05.05.2020 17:38, Jon Doron wrote:
> On 05/05/2020, Igor Mammedov wrote:
>
> I dont know what were the original intentions of the original patch authors (at this point I simply rebased it, and to be honest I did not need this patch to get where I was going to, but it was part of the original patchset).
>
> But I'm willing to do any changes so we can keep going forward with this.
>
>> On Fri, 24 Apr 2020 15:34:43 +0300
>> Jon Doron <arilou@gmail.com> wrote:
>>
>>> Guest OS uses ACPI to discover VMBus presence. Add a corresponding
>>> entry to DSDT in case VMBus has been enabled.
>>>
>>> Experimentally Windows guests were found to require this entry to
>>> include two IRQ resources. They seem to never be used but they still
>>> have to be there.
>>>
>>> Make IRQ numbers user-configurable via corresponding properties; use 7
>>> and 13 by default.
>> well, it seems that at least linux guest driver uses one IRQ,
>> abeit not from ACPI descriptior
>>
>> perhaps it's what hyperv host puts into _CRS.
>> Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
>>
>>
>
> I can no longer get to the HyperV computer I had (in the office so hopefully if someone else has access to HyperV machine and willing to reply here with the dumped ACPI tables that would be great).
>
Here is a VMBus ACPI device description from Hyper-V in Windows Server 2019:
Device (\_SB.VMOD.VMBS)
{
Name (STA, 0x0F)
Name (_ADR, Zero) // _ADR: Address
Name (_DDN, "VMBUS") // _DDN: DOS Device Name
Name (_HID, "VMBus") // _HID: Hardware ID
Name (_UID, Zero) // _UID: Unique ID
Method (_DIS, 0, NotSerialized) // _DIS: Disable Device
{
STA &= 0x0D
}
Method (_PS0, 0, NotSerialized) // _PS0: Power State 0
{
STA |= 0x0F
}
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (STA) /* \_SB_.VMOD.VMBS.STA_ */
}
Name (_PS3, Zero) // _PS3: Power State 3
Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
{
IRQ (Edge, ActiveHigh, Exclusive, )
{5}
})
}
It seems to use just IRQ 5.
Maciej
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-06 13:37 ` Maciej S. Szmigiero
@ 2020-05-07 3:14 ` Jon Doron
2020-05-11 20:11 ` Roman Kagan
0 siblings, 1 reply; 31+ messages in thread
From: Jon Doron @ 2020-05-07 3:14 UTC (permalink / raw)
To: Maciej S. Szmigiero
Cc: eyakovlev, ehabkost, rvkagan, qemu-devel, liran.alon,
Roman Kagan, pbonzini, Igor Mammedov, vkuznets
Thank you Maciej :)
Igor it seems like the IRQ being used is 5 and not 7 & 13 like in the
current patch. Seems like it needs to reside in the _CRS like you said.
Seems like it has all those _STA/_DIS/_PS0 just like the way it's
currently in the patch (unless I'm missing something).
Notice _PS3 is not a Method.
So just to summarize the changes i need to do:
1. Change from 2 IRQs to single one (and use 5 as the default)
2. IRQs needs to be under _CRS.
3. You mentioned you want under a different location than the ISA bug
where would you want it to be?
Please let me know if there is anything else.
Thanks,
-- Jon.
On 06/05/2020, Maciej S. Szmigiero wrote:
>On 05.05.2020 17:38, Jon Doron wrote:
>> On 05/05/2020, Igor Mammedov wrote:
>>
>> I dont know what were the original intentions of the original patch authors (at this point I simply rebased it, and to be honest I did not need this patch to get where I was going to, but it was part of the original patchset).
>>
>> But I'm willing to do any changes so we can keep going forward with this.
>>
>>> On Fri, 24 Apr 2020 15:34:43 +0300
>>> Jon Doron <arilou@gmail.com> wrote:
>>>
>>>> Guest OS uses ACPI to discover VMBus presence. Add a corresponding
>>>> entry to DSDT in case VMBus has been enabled.
>>>>
>>>> Experimentally Windows guests were found to require this entry to
>>>> include two IRQ resources. They seem to never be used but they still
>>>> have to be there.
>>>>
>>>> Make IRQ numbers user-configurable via corresponding properties; use 7
>>>> and 13 by default.
>>> well, it seems that at least linux guest driver uses one IRQ,
>>> abeit not from ACPI descriptior
>>>
>>> perhaps it's what hyperv host puts into _CRS.
>>> Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
>>>
>>>
>>
>> I can no longer get to the HyperV computer I had (in the office so hopefully if someone else has access to HyperV machine and willing to reply here with the dumped ACPI tables that would be great).
>>
>
>Here is a VMBus ACPI device description from Hyper-V in Windows Server 2019:
>
>Device (\_SB.VMOD.VMBS)
>{
> Name (STA, 0x0F)
> Name (_ADR, Zero) // _ADR: Address
> Name (_DDN, "VMBUS") // _DDN: DOS Device Name
> Name (_HID, "VMBus") // _HID: Hardware ID
> Name (_UID, Zero) // _UID: Unique ID
> Method (_DIS, 0, NotSerialized) // _DIS: Disable Device
> {
> STA &= 0x0D
> }
>
> Method (_PS0, 0, NotSerialized) // _PS0: Power State 0
> {
> STA |= 0x0F
> }
>
> Method (_STA, 0, NotSerialized) // _STA: Status
> {
> Return (STA) /* \_SB_.VMOD.VMBS.STA_ */
> }
>
> Name (_PS3, Zero) // _PS3: Power State 3
> Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
> {
> IRQ (Edge, ActiveHigh, Exclusive, )
> {5}
> })
>}
>
>It seems to use just IRQ 5.
>
>Maciej
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-05 13:06 ` Igor Mammedov
2020-05-05 15:38 ` Jon Doron
@ 2020-05-11 18:21 ` Roman Kagan
2020-05-13 15:34 ` Igor Mammedov
1 sibling, 1 reply; 31+ messages in thread
From: Roman Kagan @ 2020-05-11 18:21 UTC (permalink / raw)
To: Igor Mammedov
Cc: mail, eyakovlev, Jon Doron, qemu-devel, liran.alon, Roman Kagan,
pbonzini, vkuznets, Maciej S . Szmigiero, ehabkost
On Tue, May 05, 2020 at 03:06:37PM +0200, Igor Mammedov wrote:
> On Fri, 24 Apr 2020 15:34:43 +0300
> Jon Doron <arilou@gmail.com> wrote:
>
> > Guest OS uses ACPI to discover VMBus presence. Add a corresponding
> > entry to DSDT in case VMBus has been enabled.
> >
> > Experimentally Windows guests were found to require this entry to
> > include two IRQ resources. They seem to never be used but they still
> > have to be there.
> >
> > Make IRQ numbers user-configurable via corresponding properties; use 7
> > and 13 by default.
> well, it seems that at least linux guest driver uses one IRQ,
> abeit not from ACPI descriptior
I guess you mean synthetic interrupts. Linux doesn't seem to use
ACPI-discovered IRQs.
> perhaps it's what hyperv host puts into _CRS.
> Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
Exactly, this was how this was conceived in the first place.
> also what if vmbus irq collides with an irq that is already taken,
> it would be better to initialize and consume irqs it climes to use
> so in case if conflict one would get a error.
That was the plan initially. However, since no guest actually used
those irqs, it appeared not worth the effort. Dunno what problems can
arise from the conflicts.
> > Signed-off-by: Evgeny Yakovlev <eyakovlev@virtuozzo.com>
> > Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
> > Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
> > Signed-off-by: Jon Doron <arilou@gmail.com>
> > ---
> > hw/hyperv/vmbus.c | 7 ++++++
> > hw/i386/acpi-build.c | 43 ++++++++++++++++++++++++++++++++
> > include/hw/hyperv/vmbus-bridge.h | 3 +++
> > 3 files changed, 53 insertions(+)
> >
> > diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
> > index 1f5873ab60..0df7afe0ca 100644
> > --- a/hw/hyperv/vmbus.c
> > +++ b/hw/hyperv/vmbus.c
> > @@ -2641,6 +2641,12 @@ static const VMStateDescription vmstate_vmbus_bridge = {
> > },
> > };
> >
> > +static Property vmbus_bridge_props[] = {
> > + DEFINE_PROP_UINT8("irq0", VMBusBridge, irq0, 7),
> > + DEFINE_PROP_UINT8("irq1", VMBusBridge, irq1, 13),
> > + DEFINE_PROP_END_OF_LIST()
> > +};
> > +
> > static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
> > {
> > DeviceClass *k = DEVICE_CLASS(klass);
> > @@ -2651,6 +2657,7 @@ static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
> > sk->explicit_ofw_unit_address = vmbus_bridge_ofw_unit_address;
> > set_bit(DEVICE_CATEGORY_BRIDGE, k->categories);
> > k->vmsd = &vmstate_vmbus_bridge;
> > + device_class_set_props(k, vmbus_bridge_props);
> > /* override SysBusDevice's default */
> > k->user_creatable = true;
> > }
> > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > index 2a7e55bae7..d235074fb8 100644
> > --- a/hw/i386/acpi-build.c
> > +++ b/hw/i386/acpi-build.c
> > @@ -50,6 +50,7 @@
> > #include "hw/mem/nvdimm.h"
> > #include "sysemu/numa.h"
> > #include "sysemu/reset.h"
> > +#include "hw/hyperv/vmbus-bridge.h"
> >
> > /* Supported chipsets: */
> > #include "hw/southbridge/piix.h"
> > @@ -1270,9 +1271,47 @@ static Aml *build_com_device_aml(uint8_t uid)
> > return dev;
> > }
> >
> > +static Aml *build_vmbus_device_aml(VMBusBridge *vmbus_bridge)
> > +{
> > + Aml *dev;
> > + Aml *method;
> > + Aml *crs;
> > +
> > + dev = aml_device("VMBS");
> > + aml_append(dev, aml_name_decl("STA", aml_int(0xF)));
> > + aml_append(dev, aml_name_decl("_HID", aml_string("VMBus")));
> > + aml_append(dev, aml_name_decl("_UID", aml_int(0x0)));
> > + aml_append(dev, aml_name_decl("_DDN", aml_string("VMBUS")));
> > +
> > + method = aml_method("_DIS", 0, AML_NOTSERIALIZED);
> > + aml_append(method, aml_store(aml_and(aml_name("STA"), aml_int(0xD), NULL),
> > + aml_name("STA")));
> > + aml_append(dev, method);
> > +
> > + method = aml_method("_PS0", 0, AML_NOTSERIALIZED);
> > + aml_append(method, aml_store(aml_or(aml_name("STA"), aml_int(0xF), NULL),
> > + aml_name("STA")));
> > + aml_append(dev, method);
> > +
> > + method = aml_method("_STA", 0, AML_NOTSERIALIZED);
> > + aml_append(method, aml_return(aml_name("STA")));
> > + aml_append(dev, method);
>
> do you reaaly need all that _STA/_DIS/_PS0,
> does it work without thouse methods?
This was just copied from HyperV. It may make sense to test without.
> > +
> > + aml_append(dev, aml_name_decl("_PS3", aml_int(0x0)));
> should be method
Not our fault :) Again this was copied.
> > +
> > + crs = aml_resource_template();
> > + aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq0));
> > + /* FIXME: newer HyperV gets by with only one IRQ */
> then why are you adding the second IRQ, does it work with 1 IRQ?
This FIXME was left by me when I noticed that more recent HyperV servers
only stick one IRQ there, but I didn't get around to dig further.
> > + aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq1));
> > + aml_append(dev, aml_name_decl("_CRS", crs));
> > +
> > + return dev;
> > +}
> > +
> > static void build_isa_devices_aml(Aml *table)
> > {
> > ISADevice *fdc = pc_find_fdc0();
> > + VMBusBridge *vmbus_bridge = vmbus_bridge_find();
> > bool ambiguous;
> >
> > Aml *scope = aml_scope("_SB.PCI0.ISA");
> > @@ -1296,6 +1335,10 @@ static void build_isa_devices_aml(Aml *table)
> > build_acpi_ipmi_devices(scope, BUS(obj), "\\_SB.PCI0.ISA");
> > }
> >
> > + if (vmbus_bridge) {
> > + aml_append(scope, build_vmbus_device_aml(vmbus_bridge));
> > + }
> it seems that bridge is sysbus device, why it's put under ISA bus?
This is where it's put by HyperV in Gen1 machines. For Gen2, which has
neither PCI nor ISA, it's put in a dedicated container.
Either way, the ancestor nodes are consulted for the memory windows for
certain devices like vmbus-pci bridges or vmbus framebuffer, so it may
be necessary to adjust this when / if we add those devices.
Thanks,
Roman.
> > aml_append(table, scope);
> > }
> >
> > diff --git a/include/hw/hyperv/vmbus-bridge.h b/include/hw/hyperv/vmbus-bridge.h
> > index 9cc8f780de..c0a06d832c 100644
> > --- a/include/hw/hyperv/vmbus-bridge.h
> > +++ b/include/hw/hyperv/vmbus-bridge.h
> > @@ -19,6 +19,9 @@ typedef struct VMBus VMBus;
> > typedef struct VMBusBridge {
> > SysBusDevice parent_obj;
> >
> > + uint8_t irq0;
> > + uint8_t irq1;
> > +
> > VMBus *bus;
> > } VMBusBridge;
> >
>
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-07 3:14 ` Jon Doron
@ 2020-05-11 20:11 ` Roman Kagan
2020-05-13 15:37 ` Igor Mammedov
0 siblings, 1 reply; 31+ messages in thread
From: Roman Kagan @ 2020-05-11 20:11 UTC (permalink / raw)
To: Jon Doron
Cc: Maciej S. Szmigiero, eyakovlev, ehabkost, qemu-devel, liran.alon,
Roman Kagan, Igor Mammedov, pbonzini, vkuznets
On Thu, May 07, 2020 at 06:14:25AM +0300, Jon Doron wrote:
> Igor it seems like the IRQ being used is 5 and not 7 & 13 like in the
> current patch.
HyperV using irq 5 doesn't mean QEMU has to too. Especially so as no
guest was noticed to use the irqs in ACPI. I'd rather try and test if
the guest requires any those at all.
> Seems like it needs to reside in the _CRS like you said.
They already are there.
> Seems like it has all those _STA/_DIS/_PS0 just like the way it's currently
> in the patch (unless I'm missing something).
Right, but, as you can see, they are pretty dumb, so the question is
whether they are necessary or the guests can do without (Linux
apparently can).
Thanks,
Roman.
> Notice _PS3 is not a Method.
>
> So just to summarize the changes i need to do:
> 1. Change from 2 IRQs to single one (and use 5 as the default)
> 2. IRQs needs to be under _CRS.
> 3. You mentioned you want under a different location than the ISA bug where
> would you want it to be?
>
> Please let me know if there is anything else.
>
> Thanks,
> -- Jon.
>
> On 06/05/2020, Maciej S. Szmigiero wrote:
> > On 05.05.2020 17:38, Jon Doron wrote:
> > > On 05/05/2020, Igor Mammedov wrote:
> > >
> > > I dont know what were the original intentions of the original patch authors (at this point I simply rebased it, and to be honest I did not need this patch to get where I was going to, but it was part of the original patchset).
> > >
> > > But I'm willing to do any changes so we can keep going forward with this.
> > >
> > > > On Fri, 24 Apr 2020 15:34:43 +0300
> > > > Jon Doron <arilou@gmail.com> wrote:
> > > >
> > > > > Guest OS uses ACPI to discover VMBus presence. Add a corresponding
> > > > > entry to DSDT in case VMBus has been enabled.
> > > > >
> > > > > Experimentally Windows guests were found to require this entry to
> > > > > include two IRQ resources. They seem to never be used but they still
> > > > > have to be there.
> > > > >
> > > > > Make IRQ numbers user-configurable via corresponding properties; use 7
> > > > > and 13 by default.
> > > > well, it seems that at least linux guest driver uses one IRQ,
> > > > abeit not from ACPI descriptior
> > > >
> > > > perhaps it's what hyperv host puts into _CRS.
> > > > Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
> > > >
> > > >
> > >
> > > I can no longer get to the HyperV computer I had (in the office so hopefully if someone else has access to HyperV machine and willing to reply here with the dumped ACPI tables that would be great).
> > >
> >
> > Here is a VMBus ACPI device description from Hyper-V in Windows Server 2019:
> >
> > Device (\_SB.VMOD.VMBS)
> > {
> > Name (STA, 0x0F)
> > Name (_ADR, Zero) // _ADR: Address
> > Name (_DDN, "VMBUS") // _DDN: DOS Device Name
> > Name (_HID, "VMBus") // _HID: Hardware ID
> > Name (_UID, Zero) // _UID: Unique ID
> > Method (_DIS, 0, NotSerialized) // _DIS: Disable Device
> > {
> > STA &= 0x0D
> > }
> >
> > Method (_PS0, 0, NotSerialized) // _PS0: Power State 0
> > {
> > STA |= 0x0F
> > }
> >
> > Method (_STA, 0, NotSerialized) // _STA: Status
> > {
> > Return (STA) /* \_SB_.VMOD.VMBS.STA_ */
> > }
> >
> > Name (_PS3, Zero) // _PS3: Power State 3
> > Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
> > {
> > IRQ (Edge, ActiveHigh, Exclusive, )
> > {5}
> > })
> > }
> >
> > It seems to use just IRQ 5.
> >
> > Maciej
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-11 18:21 ` Roman Kagan
@ 2020-05-13 15:34 ` Igor Mammedov
2020-05-21 16:02 ` Paolo Bonzini
0 siblings, 1 reply; 31+ messages in thread
From: Igor Mammedov @ 2020-05-13 15:34 UTC (permalink / raw)
To: Roman Kagan
Cc: mail, eyakovlev, Jon Doron, qemu-devel, liran.alon, Roman Kagan,
pbonzini, vkuznets, Maciej S . Szmigiero, ehabkost
On Mon, 11 May 2020 21:21:56 +0300
Roman Kagan <rvkagan@yandex-team.ru> wrote:
> On Tue, May 05, 2020 at 03:06:37PM +0200, Igor Mammedov wrote:
> > On Fri, 24 Apr 2020 15:34:43 +0300
> > Jon Doron <arilou@gmail.com> wrote:
> >
> > > Guest OS uses ACPI to discover VMBus presence. Add a corresponding
> > > entry to DSDT in case VMBus has been enabled.
> > >
> > > Experimentally Windows guests were found to require this entry to
> > > include two IRQ resources. They seem to never be used but they still
> > > have to be there.
> > >
> > > Make IRQ numbers user-configurable via corresponding properties; use 7
> > > and 13 by default.
> > well, it seems that at least linux guest driver uses one IRQ,
> > abeit not from ACPI descriptior
>
> I guess you mean synthetic interrupts. Linux doesn't seem to use
> ACPI-discovered IRQs.
indeed it doesn't, but that doesn't mean that Windows doesn't as well.
> > perhaps it's what hyperv host puts into _CRS.
> > Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
>
> Exactly, this was how this was conceived in the first place.
>
> > also what if vmbus irq collides with an irq that is already taken,
> > it would be better to initialize and consume irqs it climes to use
> > so in case if conflict one would get a error.
>
> That was the plan initially. However, since no guest actually used
> those irqs, it appeared not worth the effort. Dunno what problems can
> arise from the conflicts.
I'd rather avoid using random IRQ numbers (considering we are dealing with
black-box here). So if it's really necessary to have IRQ described here,
I'd suggest to implement them in device model so they would be reserved
and QEMU would error out in a sane way if IRQ conflict is detected.
> > > Signed-off-by: Evgeny Yakovlev <eyakovlev@virtuozzo.com>
> > > Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
> > > Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
> > > Signed-off-by: Jon Doron <arilou@gmail.com>
> > > ---
> > > hw/hyperv/vmbus.c | 7 ++++++
> > > hw/i386/acpi-build.c | 43 ++++++++++++++++++++++++++++++++
> > > include/hw/hyperv/vmbus-bridge.h | 3 +++
> > > 3 files changed, 53 insertions(+)
> > >
> > > diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c
> > > index 1f5873ab60..0df7afe0ca 100644
> > > --- a/hw/hyperv/vmbus.c
> > > +++ b/hw/hyperv/vmbus.c
> > > @@ -2641,6 +2641,12 @@ static const VMStateDescription vmstate_vmbus_bridge = {
> > > },
> > > };
> > >
> > > +static Property vmbus_bridge_props[] = {
> > > + DEFINE_PROP_UINT8("irq0", VMBusBridge, irq0, 7),
> > > + DEFINE_PROP_UINT8("irq1", VMBusBridge, irq1, 13),
> > > + DEFINE_PROP_END_OF_LIST()
> > > +};
> > > +
> > > static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
> > > {
> > > DeviceClass *k = DEVICE_CLASS(klass);
> > > @@ -2651,6 +2657,7 @@ static void vmbus_bridge_class_init(ObjectClass *klass, void *data)
> > > sk->explicit_ofw_unit_address = vmbus_bridge_ofw_unit_address;
> > > set_bit(DEVICE_CATEGORY_BRIDGE, k->categories);
> > > k->vmsd = &vmstate_vmbus_bridge;
> > > + device_class_set_props(k, vmbus_bridge_props);
> > > /* override SysBusDevice's default */
> > > k->user_creatable = true;
> > > }
> > > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > > index 2a7e55bae7..d235074fb8 100644
> > > --- a/hw/i386/acpi-build.c
> > > +++ b/hw/i386/acpi-build.c
> > > @@ -50,6 +50,7 @@
> > > #include "hw/mem/nvdimm.h"
> > > #include "sysemu/numa.h"
> > > #include "sysemu/reset.h"
> > > +#include "hw/hyperv/vmbus-bridge.h"
> > >
> > > /* Supported chipsets: */
> > > #include "hw/southbridge/piix.h"
> > > @@ -1270,9 +1271,47 @@ static Aml *build_com_device_aml(uint8_t uid)
> > > return dev;
> > > }
> > >
> > > +static Aml *build_vmbus_device_aml(VMBusBridge *vmbus_bridge)
> > > +{
> > > + Aml *dev;
> > > + Aml *method;
> > > + Aml *crs;
> > > +
> > > + dev = aml_device("VMBS");
> > > + aml_append(dev, aml_name_decl("STA", aml_int(0xF)));
> > > + aml_append(dev, aml_name_decl("_HID", aml_string("VMBus")));
> > > + aml_append(dev, aml_name_decl("_UID", aml_int(0x0)));
> > > + aml_append(dev, aml_name_decl("_DDN", aml_string("VMBUS")));
> > > +
> > > + method = aml_method("_DIS", 0, AML_NOTSERIALIZED);
> > > + aml_append(method, aml_store(aml_and(aml_name("STA"), aml_int(0xD), NULL),
> > > + aml_name("STA")));
> > > + aml_append(dev, method);
> > > +
> > > + method = aml_method("_PS0", 0, AML_NOTSERIALIZED);
> > > + aml_append(method, aml_store(aml_or(aml_name("STA"), aml_int(0xF), NULL),
> > > + aml_name("STA")));
> > > + aml_append(dev, method);
> > > +
> > > + method = aml_method("_STA", 0, AML_NOTSERIALIZED);
> > > + aml_append(method, aml_return(aml_name("STA")));
> > > + aml_append(dev, method);
> >
> > do you reaaly need all that _STA/_DIS/_PS0,
> > does it work without thouse methods?
>
> This was just copied from HyperV. It may make sense to test without.
>
> > > +
> > > + aml_append(dev, aml_name_decl("_PS3", aml_int(0x0)));
> > should be method
>
> Not our fault :) Again this was copied.
>
> > > +
> > > + crs = aml_resource_template();
> > > + aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq0));
> > > + /* FIXME: newer HyperV gets by with only one IRQ */
> > then why are you adding the second IRQ, does it work with 1 IRQ?
>
> This FIXME was left by me when I noticed that more recent HyperV servers
> only stick one IRQ there, but I didn't get around to dig further.
>
> > > + aml_append(crs, aml_irq_no_flags(vmbus_bridge->irq1));
> > > + aml_append(dev, aml_name_decl("_CRS", crs));
> > > +
> > > + return dev;
> > > +}
> > > +
> > > static void build_isa_devices_aml(Aml *table)
> > > {
> > > ISADevice *fdc = pc_find_fdc0();
> > > + VMBusBridge *vmbus_bridge = vmbus_bridge_find();
> > > bool ambiguous;
> > >
> > > Aml *scope = aml_scope("_SB.PCI0.ISA");
> > > @@ -1296,6 +1335,10 @@ static void build_isa_devices_aml(Aml *table)
> > > build_acpi_ipmi_devices(scope, BUS(obj), "\\_SB.PCI0.ISA");
> > > }
> > >
> > > + if (vmbus_bridge) {
> > > + aml_append(scope, build_vmbus_device_aml(vmbus_bridge));
> > > + }
> > it seems that bridge is sysbus device, why it's put under ISA bus?
>
> This is where it's put by HyperV in Gen1 machines. For Gen2, which has
> neither PCI nor ISA, it's put in a dedicated container.
>
> Either way, the ancestor nodes are consulted for the memory windows for
> certain devices like vmbus-pci bridges or vmbus framebuffer, so it may
> be necessary to adjust this when / if we add those devices.
>
> Thanks,
> Roman.
>
> > > aml_append(table, scope);
> > > }
> > >
> > > diff --git a/include/hw/hyperv/vmbus-bridge.h b/include/hw/hyperv/vmbus-bridge.h
> > > index 9cc8f780de..c0a06d832c 100644
> > > --- a/include/hw/hyperv/vmbus-bridge.h
> > > +++ b/include/hw/hyperv/vmbus-bridge.h
> > > @@ -19,6 +19,9 @@ typedef struct VMBus VMBus;
> > > typedef struct VMBusBridge {
> > > SysBusDevice parent_obj;
> > >
> > > + uint8_t irq0;
> > > + uint8_t irq1;
> > > +
> > > VMBus *bus;
> > > } VMBusBridge;
> > >
> >
> >
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-11 20:11 ` Roman Kagan
@ 2020-05-13 15:37 ` Igor Mammedov
2020-05-15 8:56 ` Jon Doron
0 siblings, 1 reply; 31+ messages in thread
From: Igor Mammedov @ 2020-05-13 15:37 UTC (permalink / raw)
To: Roman Kagan
Cc: Maciej S. Szmigiero, eyakovlev, Jon Doron, qemu-devel,
liran.alon, Roman Kagan, pbonzini, vkuznets, ehabkost
On Mon, 11 May 2020 23:11:23 +0300
Roman Kagan <rvkagan@yandex-team.ru> wrote:
> On Thu, May 07, 2020 at 06:14:25AM +0300, Jon Doron wrote:
> > Igor it seems like the IRQ being used is 5 and not 7 & 13 like in the
> > current patch.
>
> HyperV using irq 5 doesn't mean QEMU has to too. Especially so as no
> guest was noticed to use the irqs in ACPI. I'd rather try and test if
> the guest requires any those at all.
>
> > Seems like it needs to reside in the _CRS like you said.
>
> They already are there.
>
> > Seems like it has all those _STA/_DIS/_PS0 just like the way it's currently
> > in the patch (unless I'm missing something).
>
> Right, but, as you can see, they are pretty dumb, so the question is
> whether they are necessary or the guests can do without (Linux
> apparently can).
Agreed with all of above,
Instead of blind copying dubious AML, we should try to figure out what's
really necessary of it and throw away the rest.
>
> Thanks,
> Roman.
>
> > Notice _PS3 is not a Method.
> >
> > So just to summarize the changes i need to do:
> > 1. Change from 2 IRQs to single one (and use 5 as the default)
> > 2. IRQs needs to be under _CRS.
> > 3. You mentioned you want under a different location than the ISA bug where
> > would you want it to be?
> >
> > Please let me know if there is anything else.
> >
> > Thanks,
> > -- Jon.
> >
> > On 06/05/2020, Maciej S. Szmigiero wrote:
> > > On 05.05.2020 17:38, Jon Doron wrote:
> > > > On 05/05/2020, Igor Mammedov wrote:
> > > >
> > > > I dont know what were the original intentions of the original patch authors (at this point I simply rebased it, and to be honest I did not need this patch to get where I was going to, but it was part of the original patchset).
> > > >
> > > > But I'm willing to do any changes so we can keep going forward with this.
> > > >
> > > > > On Fri, 24 Apr 2020 15:34:43 +0300
> > > > > Jon Doron <arilou@gmail.com> wrote:
> > > > >
> > > > > > Guest OS uses ACPI to discover VMBus presence. Add a corresponding
> > > > > > entry to DSDT in case VMBus has been enabled.
> > > > > >
> > > > > > Experimentally Windows guests were found to require this entry to
> > > > > > include two IRQ resources. They seem to never be used but they still
> > > > > > have to be there.
> > > > > >
> > > > > > Make IRQ numbers user-configurable via corresponding properties; use 7
> > > > > > and 13 by default.
> > > > > well, it seems that at least linux guest driver uses one IRQ,
> > > > > abeit not from ACPI descriptior
> > > > >
> > > > > perhaps it's what hyperv host puts into _CRS.
> > > > > Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
> > > > >
> > > > >
> > > >
> > > > I can no longer get to the HyperV computer I had (in the office so hopefully if someone else has access to HyperV machine and willing to reply here with the dumped ACPI tables that would be great).
> > > >
> > >
> > > Here is a VMBus ACPI device description from Hyper-V in Windows Server 2019:
> > >
> > > Device (\_SB.VMOD.VMBS)
> > > {
> > > Name (STA, 0x0F)
> > > Name (_ADR, Zero) // _ADR: Address
> > > Name (_DDN, "VMBUS") // _DDN: DOS Device Name
> > > Name (_HID, "VMBus") // _HID: Hardware ID
> > > Name (_UID, Zero) // _UID: Unique ID
> > > Method (_DIS, 0, NotSerialized) // _DIS: Disable Device
> > > {
> > > STA &= 0x0D
> > > }
> > >
> > > Method (_PS0, 0, NotSerialized) // _PS0: Power State 0
> > > {
> > > STA |= 0x0F
> > > }
> > >
> > > Method (_STA, 0, NotSerialized) // _STA: Status
> > > {
> > > Return (STA) /* \_SB_.VMOD.VMBS.STA_ */
> > > }
> > >
> > > Name (_PS3, Zero) // _PS3: Power State 3
> > > Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
> > > {
> > > IRQ (Edge, ActiveHigh, Exclusive, )
> > > {5}
> > > })
> > > }
> > >
> > > It seems to use just IRQ 5.
> > >
> > > Maciej
> >
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-13 15:37 ` Igor Mammedov
@ 2020-05-15 8:56 ` Jon Doron
2020-05-15 12:35 ` Roman Kagan
0 siblings, 1 reply; 31+ messages in thread
From: Jon Doron @ 2020-05-15 8:56 UTC (permalink / raw)
To: Igor Mammedov
Cc: Maciej S. Szmigiero, eyakovlev, ehabkost, qemu-devel,
Roman Kagan, liran.alon, Roman Kagan, pbonzini, vkuznets
On 13/05/2020, Igor Mammedov wrote:
Do you guys know perhaps which module is reading the ACPI configuration
for VMBus? vmbus.sys / vmbkmcl.sys / winhv.sys? is it the kernel or HAL?
I dont have any real HyperV Windows to play with...
Roman, do you remember when is this information being used? Do we need a
full emulation setup (aka your hv-scsi / hv-net) patches in order to see
Windows working this ACPI entry?
Thanks,
-- Jon.
>On Mon, 11 May 2020 23:11:23 +0300
>Roman Kagan <rvkagan@yandex-team.ru> wrote:
>
>> On Thu, May 07, 2020 at 06:14:25AM +0300, Jon Doron wrote:
>> > Igor it seems like the IRQ being used is 5 and not 7 & 13 like in the
>> > current patch.
>>
>> HyperV using irq 5 doesn't mean QEMU has to too. Especially so as no
>> guest was noticed to use the irqs in ACPI. I'd rather try and test if
>> the guest requires any those at all.
>>
>> > Seems like it needs to reside in the _CRS like you said.
>>
>> They already are there.
>>
>> > Seems like it has all those _STA/_DIS/_PS0 just like the way it's currently
>> > in the patch (unless I'm missing something).
>>
>> Right, but, as you can see, they are pretty dumb, so the question is
>> whether they are necessary or the guests can do without (Linux
>> apparently can).
>
>Agreed with all of above,
>Instead of blind copying dubious AML, we should try to figure out what's
>really necessary of it and throw away the rest.
>
>>
>> Thanks,
>> Roman.
>>
>> > Notice _PS3 is not a Method.
>> >
>> > So just to summarize the changes i need to do:
>> > 1. Change from 2 IRQs to single one (and use 5 as the default)
>> > 2. IRQs needs to be under _CRS.
>> > 3. You mentioned you want under a different location than the ISA bug where
>> > would you want it to be?
>> >
>> > Please let me know if there is anything else.
>> >
>> > Thanks,
>> > -- Jon.
>> >
>> > On 06/05/2020, Maciej S. Szmigiero wrote:
>> > > On 05.05.2020 17:38, Jon Doron wrote:
>> > > > On 05/05/2020, Igor Mammedov wrote:
>> > > >
>> > > > I dont know what were the original intentions of the original patch authors (at this point I simply rebased it, and to be honest I did not need this patch to get where I was going to, but it was part of the original patchset).
>> > > >
>> > > > But I'm willing to do any changes so we can keep going forward with this.
>> > > >
>> > > > > On Fri, 24 Apr 2020 15:34:43 +0300
>> > > > > Jon Doron <arilou@gmail.com> wrote:
>> > > > >
>> > > > > > Guest OS uses ACPI to discover VMBus presence. Add a corresponding
>> > > > > > entry to DSDT in case VMBus has been enabled.
>> > > > > >
>> > > > > > Experimentally Windows guests were found to require this entry to
>> > > > > > include two IRQ resources. They seem to never be used but they still
>> > > > > > have to be there.
>> > > > > >
>> > > > > > Make IRQ numbers user-configurable via corresponding properties; use 7
>> > > > > > and 13 by default.
>> > > > > well, it seems that at least linux guest driver uses one IRQ,
>> > > > > abeit not from ACPI descriptior
>> > > > >
>> > > > > perhaps it's what hyperv host puts into _CRS.
>> > > > > Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
>> > > > >
>> > > > >
>> > > >
>> > > > I can no longer get to the HyperV computer I had (in the office so hopefully if someone else has access to HyperV machine and willing to reply here with the dumped ACPI tables that would be great).
>> > > >
>> > >
>> > > Here is a VMBus ACPI device description from Hyper-V in Windows Server 2019:
>> > >
>> > > Device (\_SB.VMOD.VMBS)
>> > > {
>> > > Name (STA, 0x0F)
>> > > Name (_ADR, Zero) // _ADR: Address
>> > > Name (_DDN, "VMBUS") // _DDN: DOS Device Name
>> > > Name (_HID, "VMBus") // _HID: Hardware ID
>> > > Name (_UID, Zero) // _UID: Unique ID
>> > > Method (_DIS, 0, NotSerialized) // _DIS: Disable Device
>> > > {
>> > > STA &= 0x0D
>> > > }
>> > >
>> > > Method (_PS0, 0, NotSerialized) // _PS0: Power State 0
>> > > {
>> > > STA |= 0x0F
>> > > }
>> > >
>> > > Method (_STA, 0, NotSerialized) // _STA: Status
>> > > {
>> > > Return (STA) /* \_SB_.VMOD.VMBS.STA_ */
>> > > }
>> > >
>> > > Name (_PS3, Zero) // _PS3: Power State 3
>> > > Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
>> > > {
>> > > IRQ (Edge, ActiveHigh, Exclusive, )
>> > > {5}
>> > > })
>> > > }
>> > >
>> > > It seems to use just IRQ 5.
>> > >
>> > > Maciej
>> >
>>
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-15 8:56 ` Jon Doron
@ 2020-05-15 12:35 ` Roman Kagan
0 siblings, 0 replies; 31+ messages in thread
From: Roman Kagan @ 2020-05-15 12:35 UTC (permalink / raw)
To: Jon Doron
Cc: Maciej S. Szmigiero, eyakovlev, ehabkost, qemu-devel, liran.alon,
Roman Kagan, pbonzini, Igor Mammedov, vkuznets
On Fri, May 15, 2020 at 11:56:36AM +0300, Jon Doron wrote:
> On 13/05/2020, Igor Mammedov wrote:
>
> Do you guys know perhaps which module is reading the ACPI configuration for
> VMBus? vmbus.sys / vmbkmcl.sys / winhv.sys? is it the kernel or HAL?
No idea...
> I dont have any real HyperV Windows to play with...
>
> Roman, do you remember when is this information being used? Do we need a
> full emulation setup (aka your hv-scsi / hv-net) patches in order to see
> Windows working this ACPI entry?
I think the series you've posted should be enough to see VMBus in the
DeviceManager. hv-scsi and hv-net should not further depend on ACPI.
hv-pci does: it (at least in its Linux driver implementation) wants the
VMBus entry or any of its ancestors to define range(s) where mmio
windows can be placed. This may be worth considering when deciding
where to stick the VMBus entry to.
Thanks,
Roman.
> Thanks,
> -- Jon.
>
> > On Mon, 11 May 2020 23:11:23 +0300
> > Roman Kagan <rvkagan@yandex-team.ru> wrote:
> >
> > > On Thu, May 07, 2020 at 06:14:25AM +0300, Jon Doron wrote:
> > > > Igor it seems like the IRQ being used is 5 and not 7 & 13 like in the
> > > > current patch.
> > >
> > > HyperV using irq 5 doesn't mean QEMU has to too. Especially so as no
> > > guest was noticed to use the irqs in ACPI. I'd rather try and test if
> > > the guest requires any those at all.
> > >
> > > > Seems like it needs to reside in the _CRS like you said.
> > >
> > > They already are there.
> > >
> > > > Seems like it has all those _STA/_DIS/_PS0 just like the way it's currently
> > > > in the patch (unless I'm missing something).
> > >
> > > Right, but, as you can see, they are pretty dumb, so the question is
> > > whether they are necessary or the guests can do without (Linux
> > > apparently can).
> >
> > Agreed with all of above,
> > Instead of blind copying dubious AML, we should try to figure out what's
> > really necessary of it and throw away the rest.
> >
> > >
> > > Thanks,
> > > Roman.
> > >
> > > > Notice _PS3 is not a Method.
> > > >
> > > > So just to summarize the changes i need to do:
> > > > 1. Change from 2 IRQs to single one (and use 5 as the default)
> > > > 2. IRQs needs to be under _CRS.
> > > > 3. You mentioned you want under a different location than the ISA bug where
> > > > would you want it to be?
> > > >
> > > > Please let me know if there is anything else.
> > > >
> > > > Thanks,
> > > > -- Jon.
> > > >
> > > > On 06/05/2020, Maciej S. Szmigiero wrote:
> > > > > On 05.05.2020 17:38, Jon Doron wrote:
> > > > > > On 05/05/2020, Igor Mammedov wrote:
> > > > > >
> > > > > > I dont know what were the original intentions of the original patch authors (at this point I simply rebased it, and to be honest I did not need this patch to get where I was going to, but it was part of the original patchset).
> > > > > >
> > > > > > But I'm willing to do any changes so we can keep going forward with this.
> > > > > >
> > > > > > > On Fri, 24 Apr 2020 15:34:43 +0300
> > > > > > > Jon Doron <arilou@gmail.com> wrote:
> > > > > > >
> > > > > > > > Guest OS uses ACPI to discover VMBus presence. Add a corresponding
> > > > > > > > entry to DSDT in case VMBus has been enabled.
> > > > > > > >
> > > > > > > > Experimentally Windows guests were found to require this entry to
> > > > > > > > include two IRQ resources. They seem to never be used but they still
> > > > > > > > have to be there.
> > > > > > > >
> > > > > > > > Make IRQ numbers user-configurable via corresponding properties; use 7
> > > > > > > > and 13 by default.
> > > > > > > well, it seems that at least linux guest driver uses one IRQ,
> > > > > > > abeit not from ACPI descriptior
> > > > > > >
> > > > > > > perhaps it's what hyperv host puts into _CRS.
> > > > > > > Could you dump ACPI tables and check how hyperv describes vmbus in acpi?
> > > > > > >
> > > > > > >
> > > > > >
> > > > > > I can no longer get to the HyperV computer I had (in the office so hopefully if someone else has access to HyperV machine and willing to reply here with the dumped ACPI tables that would be great).
> > > > > >
> > > > >
> > > > > Here is a VMBus ACPI device description from Hyper-V in Windows Server 2019:
> > > > >
> > > > > Device (\_SB.VMOD.VMBS)
> > > > > {
> > > > > Name (STA, 0x0F)
> > > > > Name (_ADR, Zero) // _ADR: Address
> > > > > Name (_DDN, "VMBUS") // _DDN: DOS Device Name
> > > > > Name (_HID, "VMBus") // _HID: Hardware ID
> > > > > Name (_UID, Zero) // _UID: Unique ID
> > > > > Method (_DIS, 0, NotSerialized) // _DIS: Disable Device
> > > > > {
> > > > > STA &= 0x0D
> > > > > }
> > > > >
> > > > > Method (_PS0, 0, NotSerialized) // _PS0: Power State 0
> > > > > {
> > > > > STA |= 0x0F
> > > > > }
> > > > >
> > > > > Method (_STA, 0, NotSerialized) // _STA: Status
> > > > > {
> > > > > Return (STA) /* \_SB_.VMOD.VMBS.STA_ */
> > > > > }
> > > > >
> > > > > Name (_PS3, Zero) // _PS3: Power State 3
> > > > > Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
> > > > > {
> > > > > IRQ (Edge, ActiveHigh, Exclusive, )
> > > > > {5}
> > > > > })
> > > > > }
> > > > >
> > > > > It seems to use just IRQ 5.
> > > > >
> > > > > Maciej
> > > >
> > >
> >
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-13 15:34 ` Igor Mammedov
@ 2020-05-21 16:02 ` Paolo Bonzini
2020-05-22 8:40 ` Igor Mammedow
0 siblings, 1 reply; 31+ messages in thread
From: Paolo Bonzini @ 2020-05-21 16:02 UTC (permalink / raw)
To: Igor Mammedov, Roman Kagan
Cc: mail, eyakovlev, Jon Doron, qemu-devel, liran.alon, Roman Kagan,
vkuznets, Maciej S . Szmigiero, ehabkost
On 13/05/20 17:34, Igor Mammedov wrote:
> I'd rather avoid using random IRQ numbers (considering we are dealing with
> black-box here). So if it's really necessary to have IRQ described here,
> I'd suggest to implement them in device model so they would be reserved
> and QEMU would error out in a sane way if IRQ conflict is detected.
We don't generally detect ISA IRQ conflicts though, do we?
Paolo
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 0/6] hyperv: VMBus implementation
2020-04-24 12:34 [PATCH v4 0/6] hyperv: VMBus implementation Jon Doron
` (5 preceding siblings ...)
2020-04-24 12:34 ` [PATCH v4 6/6] vmbus: add infrastructure to save/load vmbus requests Jon Doron
@ 2020-05-21 16:03 ` Paolo Bonzini
2020-05-22 2:53 ` Jon Doron
6 siblings, 1 reply; 31+ messages in thread
From: Paolo Bonzini @ 2020-05-21 16:03 UTC (permalink / raw)
To: Jon Doron, qemu-devel
Cc: mail, eyakovlev, ehabkost, rvkagan, liran.alon, vkuznets
On 24/04/20 14:34, Jon Doron wrote:
> This is a rebase of the old patchset from Roman for HyperV VMBus
> implementation.
>
> How to use:
> -device vmbus-bridge
>
> Later on new paravirtualized devices can be implemented on top of it
> (Network/SCSI/etc.)
>
> VMBus is a collection of technologies. At its lowest layer, it's a message
> passing and signaling mechanism, allowing efficient passing of messages to and
> from guest VMs. A layer higher, it's a mechanism for defining channels of
> communication, where each channel is tagged with a type (which implies a
> protocol) and a instance ID. A layer higher than that, it's a bus driver,
> serving as the basis of device enumeration within a VM, where a channel can
> optionally be exposed as a paravirtual device. When a server-side (paravirtual
> back-end) component wishes to offer a channel to a guest VM, it does so by
> specifying a channel type, a mode, and an instance ID. VMBus then exposes this
> in the guest.
>
> More information about VMBus can be found in the file
> vmbuskernelmodeclientlibapi.h in Microsoft's WDK.
>
> v4:
> Decided to ditch the patch that envolves handling of EOM as there is
> still a discussion going on with it in the KVM mailing list.
>
> v3:
> Fixed an error asan
>
> v2:
> Rebased on top of latest patchset from Roman and Maciej
>
> Jon Doron (6):
> hyperv: expose API to determine if synic is enabled
> vmbus: add vmbus protocol definitions
> vmbus: vmbus implementation
> i386:pc: whitelist dynamic vmbus-bridge
> i386: Hyper-V VMBus ACPI DSDT entry
> vmbus: add infrastructure to save/load vmbus requests
>
> Makefile.objs | 1 +
> hw/hyperv/Kconfig | 5 +
> hw/hyperv/Makefile.objs | 1 +
> hw/hyperv/hyperv.c | 8 +
> hw/hyperv/trace-events | 18 +
> hw/hyperv/vmbus.c | 2778 ++++++++++++++++++++++++++++++
> hw/i386/acpi-build.c | 43 +
> hw/i386/pc_piix.c | 2 +
> hw/i386/pc_q35.c | 2 +
> include/hw/hyperv/hyperv.h | 1 +
> include/hw/hyperv/vmbus-bridge.h | 35 +
> include/hw/hyperv/vmbus-proto.h | 222 +++
> include/hw/hyperv/vmbus.h | 230 +++
> 13 files changed, 3346 insertions(+)
> create mode 100644 hw/hyperv/trace-events
> create mode 100644 hw/hyperv/vmbus.c
> create mode 100644 include/hw/hyperv/vmbus-bridge.h
> create mode 100644 include/hw/hyperv/vmbus-proto.h
> create mode 100644 include/hw/hyperv/vmbus.h
>
Queued, thanks. I'll take a look at the EOM handling threads next.
Paolo
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 0/6] hyperv: VMBus implementation
2020-05-21 16:03 ` [PATCH v4 0/6] hyperv: VMBus implementation Paolo Bonzini
@ 2020-05-22 2:53 ` Jon Doron
2020-05-22 7:19 ` Paolo Bonzini
0 siblings, 1 reply; 31+ messages in thread
From: Jon Doron @ 2020-05-22 2:53 UTC (permalink / raw)
To: Paolo Bonzini
Cc: mail, eyakovlev, ehabkost, rvkagan, qemu-devel, liran.alon, vkuznets
On 21/05/2020, Paolo Bonzini wrote:
>On 24/04/20 14:34, Jon Doron wrote:
>> This is a rebase of the old patchset from Roman for HyperV VMBus
>> implementation.
>>
>> How to use:
>> -device vmbus-bridge
>>
>> Later on new paravirtualized devices can be implemented on top of it
>> (Network/SCSI/etc.)
>>
>> VMBus is a collection of technologies. At its lowest layer, it's a message
>> passing and signaling mechanism, allowing efficient passing of messages to and
>> from guest VMs. A layer higher, it's a mechanism for defining channels of
>> communication, where each channel is tagged with a type (which implies a
>> protocol) and a instance ID. A layer higher than that, it's a bus driver,
>> serving as the basis of device enumeration within a VM, where a channel can
>> optionally be exposed as a paravirtual device. When a server-side (paravirtual
>> back-end) component wishes to offer a channel to a guest VM, it does so by
>> specifying a channel type, a mode, and an instance ID. VMBus then exposes this
>> in the guest.
>>
>> More information about VMBus can be found in the file
>> vmbuskernelmodeclientlibapi.h in Microsoft's WDK.
>>
>> v4:
>> Decided to ditch the patch that envolves handling of EOM as there is
>> still a discussion going on with it in the KVM mailing list.
>>
>> v3:
>> Fixed an error asan
>>
>> v2:
>> Rebased on top of latest patchset from Roman and Maciej
>>
>> Jon Doron (6):
>> hyperv: expose API to determine if synic is enabled
>> vmbus: add vmbus protocol definitions
>> vmbus: vmbus implementation
>> i386:pc: whitelist dynamic vmbus-bridge
>> i386: Hyper-V VMBus ACPI DSDT entry
>> vmbus: add infrastructure to save/load vmbus requests
>>
>> Makefile.objs | 1 +
>> hw/hyperv/Kconfig | 5 +
>> hw/hyperv/Makefile.objs | 1 +
>> hw/hyperv/hyperv.c | 8 +
>> hw/hyperv/trace-events | 18 +
>> hw/hyperv/vmbus.c | 2778 ++++++++++++++++++++++++++++++
>> hw/i386/acpi-build.c | 43 +
>> hw/i386/pc_piix.c | 2 +
>> hw/i386/pc_q35.c | 2 +
>> include/hw/hyperv/hyperv.h | 1 +
>> include/hw/hyperv/vmbus-bridge.h | 35 +
>> include/hw/hyperv/vmbus-proto.h | 222 +++
>> include/hw/hyperv/vmbus.h | 230 +++
>> 13 files changed, 3346 insertions(+)
>> create mode 100644 hw/hyperv/trace-events
>> create mode 100644 hw/hyperv/vmbus.c
>> create mode 100644 include/hw/hyperv/vmbus-bridge.h
>> create mode 100644 include/hw/hyperv/vmbus-proto.h
>> create mode 100644 include/hw/hyperv/vmbus.h
>>
>
>Queued, thanks. I'll take a look at the EOM handling threads next.
>
>Paolo
>
Hi Paolo, there is no need to look at the EOM, we have scraped it as you
can see in v4 :)
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 0/6] hyperv: VMBus implementation
2020-05-22 2:53 ` Jon Doron
@ 2020-05-22 7:19 ` Paolo Bonzini
0 siblings, 0 replies; 31+ messages in thread
From: Paolo Bonzini @ 2020-05-22 7:19 UTC (permalink / raw)
To: Jon Doron
Cc: mail, eyakovlev, ehabkost, rvkagan, qemu-devel, liran.alon, vkuznets
On 22/05/20 04:53, Jon Doron wrote:
>>>
>>>
>>
>> Queued, thanks. I'll take a look at the EOM handling threads next.
>>
>> Paolo
>>
>
> Hi Paolo, there is no need to look at the EOM, we have scraped it as you
> can see in v4 :)
I mean in order to un-scrape it. :)
Paolo
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-21 16:02 ` Paolo Bonzini
@ 2020-05-22 8:40 ` Igor Mammedow
2020-05-28 5:26 ` Jon Doron
0 siblings, 1 reply; 31+ messages in thread
From: Igor Mammedow @ 2020-05-22 8:40 UTC (permalink / raw)
To: Paolo Bonzini
Cc: mail, eyakovlev, Jon Doron, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, vkuznets, Maciej S . Szmigiero, ehabkost
On Thu, 21 May 2020 18:02:07 +0200
Paolo Bonzini <pbonzini@redhat.com> wrote:
> On 13/05/20 17:34, Igor Mammedov wrote:
> > I'd rather avoid using random IRQ numbers (considering we are
> > dealing with black-box here). So if it's really necessary to have
> > IRQ described here, I'd suggest to implement them in device model
> > so they would be reserved and QEMU would error out in a sane way if
> > IRQ conflict is detected.
>
> We don't generally detect ISA IRQ conflicts though, do we?
that I don't know that's why I'm not suggesting how to do it.
The point is hard-coding in AML random IRQs is not right thing to do,
(especially with the lack of 'any' spec), as minimum AML should pull
it from device model and that probably should be configurable and set
by board.
Other thing is:
I haven't looked at VMBus device model in detail, but DSDT part aren't
matching device though (device model is not ISA device hence AML part
shouldn't be on in ISA scope), where to put it is open question.
There were other issues with AML code, I've commented on, so I was
waiting on respin with comments addressed.
I don't think that this patch is good enough for merging.
>
> Paolo
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-22 8:40 ` Igor Mammedow
@ 2020-05-28 5:26 ` Jon Doron
2020-05-28 5:36 ` Jon Doron
2020-05-28 10:37 ` Igor Mammedov
0 siblings, 2 replies; 31+ messages in thread
From: Jon Doron @ 2020-05-28 5:26 UTC (permalink / raw)
To: Igor Mammedow
Cc: mail, eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, vkuznets, Maciej S . Szmigiero
On 22/05/2020, Igor Mammedow wrote:
>On Thu, 21 May 2020 18:02:07 +0200
>Paolo Bonzini <pbonzini@redhat.com> wrote:
>
>> On 13/05/20 17:34, Igor Mammedov wrote:
>> > I'd rather avoid using random IRQ numbers (considering we are
>> > dealing with black-box here). So if it's really necessary to have
>> > IRQ described here, I'd suggest to implement them in device model
>> > so they would be reserved and QEMU would error out in a sane way if
>> > IRQ conflict is detected.
>>
>> We don't generally detect ISA IRQ conflicts though, do we?
>
>that I don't know that's why I'm not suggesting how to do it.
>The point is hard-coding in AML random IRQs is not right thing to do,
>(especially with the lack of 'any' spec), as minimum AML should pull
>it from device model and that probably should be configurable and set
>by board.
>
>Other thing is:
>I haven't looked at VMBus device model in detail, but DSDT part aren't
>matching device though (device model is not ISA device hence AML part
>shouldn't be on in ISA scope), where to put it is open question.
>There were other issues with AML code, I've commented on, so I was
>waiting on respin with comments addressed.
>I don't think that this patch is good enough for merging.
>
>
But it seems like the current patch does match what's Microsoft HyperV
is publishing in it's APCI tables.
I dont think it's correct for us to "fix" Microsoft emulation even if
it's wrong, since that's what Windows probably expects to see...
I tried looking where Microsoft uses the ACPI tables to identify the
VMBus but without much luck in order to understand how flexible a change
would be for the OS to still detect the VMBus device, but in general
I think "correcting" something that is emulated 1:1 because there is no
spec is the right way.
>>
>> Paolo
>>
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-28 5:26 ` Jon Doron
@ 2020-05-28 5:36 ` Jon Doron
2020-05-28 10:37 ` Igor Mammedov
1 sibling, 0 replies; 31+ messages in thread
From: Jon Doron @ 2020-05-28 5:36 UTC (permalink / raw)
To: Igor Mammedow
Cc: mail, eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, vkuznets, Maciej S . Szmigiero
On 28/05/2020, Jon Doron wrote:
>On 22/05/2020, Igor Mammedow wrote:
>>On Thu, 21 May 2020 18:02:07 +0200
>>Paolo Bonzini <pbonzini@redhat.com> wrote:
>>
>>>On 13/05/20 17:34, Igor Mammedov wrote:
>>>> I'd rather avoid using random IRQ numbers (considering we are
>>>> dealing with black-box here). So if it's really necessary to have
>>>> IRQ described here, I'd suggest to implement them in device model
>>>> so they would be reserved and QEMU would error out in a sane way if
>>>> IRQ conflict is detected.
>>>
>>>We don't generally detect ISA IRQ conflicts though, do we?
>>
>>that I don't know that's why I'm not suggesting how to do it.
>>The point is hard-coding in AML random IRQs is not right thing to do,
>>(especially with the lack of 'any' spec), as minimum AML should pull
>>it from device model and that probably should be configurable and set
>>by board.
>>
>>Other thing is:
>>I haven't looked at VMBus device model in detail, but DSDT part aren't
>>matching device though (device model is not ISA device hence AML part
>>shouldn't be on in ISA scope), where to put it is open question.
>>There were other issues with AML code, I've commented on, so I was
>>waiting on respin with comments addressed.
>>I don't think that this patch is good enough for merging.
>>
>>
>
>But it seems like the current patch does match what's Microsoft HyperV
>is publishing in it's APCI tables.
>
>I dont think it's correct for us to "fix" Microsoft emulation even if
>it's wrong, since that's what Windows probably expects to see...
>
>I tried looking where Microsoft uses the ACPI tables to identify the
>VMBus but without much luck in order to understand how flexible a
>change would be for the OS to still detect the VMBus device, but in
>general I think "correcting" something that is emulated 1:1 because
>there is no spec is the right way.
>
Bah sorry meant to say:
In general correcting some virtual emulated device which is current is
matching 1:1 is wrong, I think the right way to handle this type of
things is to copy them 1:1 and not try to "fix" or "correct" them since
that's what Windows expects.
>>>
>>>Paolo
>>>
>>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-28 5:26 ` Jon Doron
2020-05-28 5:36 ` Jon Doron
@ 2020-05-28 10:37 ` Igor Mammedov
2020-05-28 11:02 ` Jon Doron
1 sibling, 1 reply; 31+ messages in thread
From: Igor Mammedov @ 2020-05-28 10:37 UTC (permalink / raw)
To: Jon Doron
Cc: mail, eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, vkuznets, Maciej S . Szmigiero
On Thu, 28 May 2020 08:26:42 +0300
Jon Doron <arilou@gmail.com> wrote:
> On 22/05/2020, Igor Mammedow wrote:
> >On Thu, 21 May 2020 18:02:07 +0200
> >Paolo Bonzini <pbonzini@redhat.com> wrote:
> >
> >> On 13/05/20 17:34, Igor Mammedov wrote:
> >> > I'd rather avoid using random IRQ numbers (considering we are
> >> > dealing with black-box here). So if it's really necessary to have
> >> > IRQ described here, I'd suggest to implement them in device model
> >> > so they would be reserved and QEMU would error out in a sane way if
> >> > IRQ conflict is detected.
> >>
> >> We don't generally detect ISA IRQ conflicts though, do we?
> >
> >that I don't know that's why I'm not suggesting how to do it.
> >The point is hard-coding in AML random IRQs is not right thing to do,
> >(especially with the lack of 'any' spec), as minimum AML should pull
> >it from device model and that probably should be configurable and set
> >by board.
> >
> >Other thing is:
> >I haven't looked at VMBus device model in detail, but DSDT part aren't
> >matching device though (device model is not ISA device hence AML part
> >shouldn't be on in ISA scope), where to put it is open question.
> >There were other issues with AML code, I've commented on, so I was
> >waiting on respin with comments addressed.
> >I don't think that this patch is good enough for merging.
> >
> >
>
> But it seems like the current patch does match what's Microsoft HyperV
> is publishing in it's APCI tables.
>
> I dont think it's correct for us to "fix" Microsoft emulation even if
> it's wrong, since that's what Windows probably expects to see...
>
> I tried looking where Microsoft uses the ACPI tables to identify the
> VMBus but without much luck in order to understand how flexible a change
> would be for the OS to still detect the VMBus device, but in general
> I think "correcting" something that is emulated 1:1 because there is no
> spec is the right way.
I'd agree, if removing nonsense would break VMBus detection (does it?).
if something is that doesn't make sense but has to stay because it is need
to make windows happy, that's fine , just add annotate is with comment,
so it won't confuse anyone why that code exists there later on.
I suggest to:
1. try dropping _PS* & _STA as it doesn't actually does anything and _PS3 is plain wrong
2. drop one IRQ, newer hyper-v seems to be doing fine with only one
3. it's not ISA device, I'd suggest to move into _SB scope
4. I don't know much about IRQs but
git grep DEFINE_PROP_ | grep -i iqr
yields nothing so I'm not sure if it's acceptable. Typically it's board that assigns
IRQ and not device, for Sysbus devices (see: sysbus_init_irq/sysbus_connect_irq).
So I'd leave it upto Paolo or someone else to decide/comment on.
>
> >>
> >> Paolo
> >>
> >
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-28 10:37 ` Igor Mammedov
@ 2020-05-28 11:02 ` Jon Doron
2020-06-14 14:11 ` Jon Doron
0 siblings, 1 reply; 31+ messages in thread
From: Jon Doron @ 2020-05-28 11:02 UTC (permalink / raw)
To: Igor Mammedov
Cc: mail, eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, vkuznets, Maciej S . Szmigiero
On 28/05/2020, Igor Mammedov wrote:
>On Thu, 28 May 2020 08:26:42 +0300
>Jon Doron <arilou@gmail.com> wrote:
>
>> On 22/05/2020, Igor Mammedow wrote:
>> >On Thu, 21 May 2020 18:02:07 +0200
>> >Paolo Bonzini <pbonzini@redhat.com> wrote:
>> >
>> >> On 13/05/20 17:34, Igor Mammedov wrote:
>> >> > I'd rather avoid using random IRQ numbers (considering we are
>> >> > dealing with black-box here). So if it's really necessary to have
>> >> > IRQ described here, I'd suggest to implement them in device model
>> >> > so they would be reserved and QEMU would error out in a sane way if
>> >> > IRQ conflict is detected.
>> >>
>> >> We don't generally detect ISA IRQ conflicts though, do we?
>> >
>> >that I don't know that's why I'm not suggesting how to do it.
>> >The point is hard-coding in AML random IRQs is not right thing to do,
>> >(especially with the lack of 'any' spec), as minimum AML should pull
>> >it from device model and that probably should be configurable and set
>> >by board.
>> >
>> >Other thing is:
>> >I haven't looked at VMBus device model in detail, but DSDT part aren't
>> >matching device though (device model is not ISA device hence AML part
>> >shouldn't be on in ISA scope), where to put it is open question.
>> >There were other issues with AML code, I've commented on, so I was
>> >waiting on respin with comments addressed.
>> >I don't think that this patch is good enough for merging.
>> >
>> >
>>
>> But it seems like the current patch does match what's Microsoft HyperV
>> is publishing in it's APCI tables.
>>
>> I dont think it's correct for us to "fix" Microsoft emulation even if
>> it's wrong, since that's what Windows probably expects to see...
>>
>> I tried looking where Microsoft uses the ACPI tables to identify the
>> VMBus but without much luck in order to understand how flexible a change
>> would be for the OS to still detect the VMBus device, but in general
>> I think "correcting" something that is emulated 1:1 because there is no
>> spec is the right way.
>
>I'd agree, if removing nonsense would break VMBus detection (does it?).
>if something is that doesn't make sense but has to stay because it is need
>to make windows happy, that's fine , just add annotate is with comment,
>so it won't confuse anyone why that code exists there later on.
>
>I suggest to:
> 1. try dropping _PS* & _STA as it doesn't actually does anything and _PS3 is plain wrong
> 2. drop one IRQ, newer hyper-v seems to be doing fine with only one
> 3. it's not ISA device, I'd suggest to move into _SB scope
> 4. I don't know much about IRQs but
> git grep DEFINE_PROP_ | grep -i iqr
> yields nothing so I'm not sure if it's acceptable. Typically it's board that assigns
> IRQ and not device, for Sysbus devices (see: sysbus_init_irq/sysbus_connect_irq).
> So I'd leave it upto Paolo or someone else to decide/comment on.
>
Sounds like a plan, I'll try to come up with the test results
(at least for Windows 10 guest which is what I have setup) and update
this thread with the results.
-- Jon.
>>
>> >>
>> >> Paolo
>> >>
>> >
>>
>
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-05-28 11:02 ` Jon Doron
@ 2020-06-14 14:11 ` Jon Doron
2020-06-14 15:20 ` Jon Doron
2020-06-14 21:40 ` Maciej S. Szmigiero
0 siblings, 2 replies; 31+ messages in thread
From: Jon Doron @ 2020-06-14 14:11 UTC (permalink / raw)
To: Igor Mammedov
Cc: mail, eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, vkuznets, Maciej S . Szmigiero
On 28/05/2020, Jon Doron wrote:
>On 28/05/2020, Igor Mammedov wrote:
>>On Thu, 28 May 2020 08:26:42 +0300
>>Jon Doron <arilou@gmail.com> wrote:
>>
>>>On 22/05/2020, Igor Mammedow wrote:
>>>>On Thu, 21 May 2020 18:02:07 +0200
>>>>Paolo Bonzini <pbonzini@redhat.com> wrote:
>>>>
>>>>> On 13/05/20 17:34, Igor Mammedov wrote:
>>>>> > I'd rather avoid using random IRQ numbers (considering we are
>>>>> > dealing with black-box here). So if it's really necessary to have
>>>>> > IRQ described here, I'd suggest to implement them in device model
>>>>> > so they would be reserved and QEMU would error out in a sane way if
>>>>> > IRQ conflict is detected.
>>>>>
>>>>> We don't generally detect ISA IRQ conflicts though, do we?
>>>>
>>>>that I don't know that's why I'm not suggesting how to do it.
>>>>The point is hard-coding in AML random IRQs is not right thing to do,
>>>>(especially with the lack of 'any' spec), as minimum AML should pull
>>>>it from device model and that probably should be configurable and set
>>>>by board.
>>>>
>>>>Other thing is:
>>>>I haven't looked at VMBus device model in detail, but DSDT part aren't
>>>>matching device though (device model is not ISA device hence AML part
>>>>shouldn't be on in ISA scope), where to put it is open question.
>>>>There were other issues with AML code, I've commented on, so I was
>>>>waiting on respin with comments addressed.
>>>>I don't think that this patch is good enough for merging.
>>>>
>>>>
>>>
>>>But it seems like the current patch does match what's Microsoft HyperV
>>>is publishing in it's APCI tables.
>>>
>>>I dont think it's correct for us to "fix" Microsoft emulation even if
>>>it's wrong, since that's what Windows probably expects to see...
>>>
>>>I tried looking where Microsoft uses the ACPI tables to identify the
>>>VMBus but without much luck in order to understand how flexible a change
>>>would be for the OS to still detect the VMBus device, but in general
>>>I think "correcting" something that is emulated 1:1 because there is no
>>>spec is the right way.
>>
>>I'd agree, if removing nonsense would break VMBus detection (does it?).
>>if something is that doesn't make sense but has to stay because it is need
>>to make windows happy, that's fine , just add annotate is with comment,
>>so it won't confuse anyone why that code exists there later on.
>>
>>I suggest to:
>>1. try dropping _PS* & _STA as it doesn't actually does anything and _PS3 is plain wrong
>>2. drop one IRQ, newer hyper-v seems to be doing fine with only one
>>3. it's not ISA device, I'd suggest to move into _SB scope
>>4. I don't know much about IRQs but
>> git grep DEFINE_PROP_ | grep -i iqr
>> yields nothing so I'm not sure if it's acceptable. Typically it's board that assigns
>> IRQ and not device, for Sysbus devices (see: sysbus_init_irq/sysbus_connect_irq).
>> So I'd leave it upto Paolo or someone else to decide/comment on.
>>
>
>Sounds like a plan, I'll try to come up with the test results
>(at least for Windows 10 guest which is what I have setup) and update
>this thread with the results.
>
>-- Jon.
>
>>>
>>>>>
>>>>> Paolo
>>>>>
>>>>
>>>
>>
Hi guys,
Sorry for the delay...
So first ill clarify what was the test, the test was to see the device
"Microsoft Hyper-V Virtual Machine Bus" in Windows Device Manager under
"System devices" with a state of "working properly".
It seems like it's ok to drop all the _PS* and _STA.
It seems to be functioning with single IRQ as well, it is worth noting
that even when i dropped the entire _CRS (so no IRQs resources are
required, the device was still showing that it's functioning, but I
suspect this might affect the child devices like hv-net and hv-scsi).
With that said I did run into a small issue I set-up Win10 1903 (aka
19H1) and it seems like VMBus now requires to have the following
features enabled:
HV_VP_RUNTIME_AVAILABLE
HV_TIME_REF_COUNT_AVAILABLE
HV_SYNIC_AVAILABLE
HV_SYNTIMERS_AVAILABLE
HV_APIC_ACCESS_AVAILABLE
HV_HYPERCALL_AVAILABLE
HV_VP_INDEX_AVAILABLE
So notice that previously only SYNIC and VPINDEX was needed, now you
need the whole thing so you need to run qemu with something like
-cpu host,hv-relaxed,hv_spinlocks=0x1fff,hv_time,hv-vapic,hv-vpindex,hv-synic,hv-runtime,hv-stimer
The validation was done in winhv!WinHvpCheckPartitionPrivileges .
Paolo I noticed you have done a PULL request, would you like to wait on
it and we will submit a version with a single IRQ (selectable by user
property) and go with Igor's suggestion dropping _PS* and _STA (though
like I said before I prefer to mimic the original HyperV with it's
bugs, but I'll leave this decision to you).
Also today VMBus only verifies SYNIC is enabled I'm not sure how but I
wonder if we want to some how exports from the CPU which other HV
features are enabled so we can verify all the required ones are set,
would appreciate if you have any suggestions here.
Cheers,
-- Jon.
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-06-14 14:11 ` Jon Doron
@ 2020-06-14 15:20 ` Jon Doron
2020-06-14 21:40 ` Maciej S. Szmigiero
1 sibling, 0 replies; 31+ messages in thread
From: Jon Doron @ 2020-06-14 15:20 UTC (permalink / raw)
To: Igor Mammedov
Cc: mail, eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, vkuznets, Maciej S . Szmigiero
On 14/06/2020, Jon Doron wrote:
>On 28/05/2020, Jon Doron wrote:
>>On 28/05/2020, Igor Mammedov wrote:
>>>On Thu, 28 May 2020 08:26:42 +0300
>>>Jon Doron <arilou@gmail.com> wrote:
>>>
>>>>On 22/05/2020, Igor Mammedow wrote:
>>>>>On Thu, 21 May 2020 18:02:07 +0200
>>>>>Paolo Bonzini <pbonzini@redhat.com> wrote:
>>>>>
>>>>>>On 13/05/20 17:34, Igor Mammedov wrote:
>>>>>>> I'd rather avoid using random IRQ numbers (considering we are
>>>>>>> dealing with black-box here). So if it's really necessary to have
>>>>>>> IRQ described here, I'd suggest to implement them in device model
>>>>>>> so they would be reserved and QEMU would error out in a sane way if
>>>>>>> IRQ conflict is detected.
>>>>>>
>>>>>>We don't generally detect ISA IRQ conflicts though, do we?
>>>>>
>>>>>that I don't know that's why I'm not suggesting how to do it.
>>>>>The point is hard-coding in AML random IRQs is not right thing to do,
>>>>>(especially with the lack of 'any' spec), as minimum AML should pull
>>>>>it from device model and that probably should be configurable and set
>>>>>by board.
>>>>>
>>>>>Other thing is:
>>>>>I haven't looked at VMBus device model in detail, but DSDT part aren't
>>>>>matching device though (device model is not ISA device hence AML part
>>>>>shouldn't be on in ISA scope), where to put it is open question.
>>>>>There were other issues with AML code, I've commented on, so I was
>>>>>waiting on respin with comments addressed.
>>>>>I don't think that this patch is good enough for merging.
>>>>>
>>>>>
>>>>
>>>>But it seems like the current patch does match what's Microsoft HyperV
>>>>is publishing in it's APCI tables.
>>>>
>>>>I dont think it's correct for us to "fix" Microsoft emulation even if
>>>>it's wrong, since that's what Windows probably expects to see...
>>>>
>>>>I tried looking where Microsoft uses the ACPI tables to identify the
>>>>VMBus but without much luck in order to understand how flexible a change
>>>>would be for the OS to still detect the VMBus device, but in general
>>>>I think "correcting" something that is emulated 1:1 because there is no
>>>>spec is the right way.
>>>
>>>I'd agree, if removing nonsense would break VMBus detection (does it?).
>>>if something is that doesn't make sense but has to stay because it is need
>>>to make windows happy, that's fine , just add annotate is with comment,
>>>so it won't confuse anyone why that code exists there later on.
>>>
>>>I suggest to:
>>>1. try dropping _PS* & _STA as it doesn't actually does anything and _PS3 is plain wrong
>>>2. drop one IRQ, newer hyper-v seems to be doing fine with only one
>>>3. it's not ISA device, I'd suggest to move into _SB scope
>>>4. I don't know much about IRQs but
>>> git grep DEFINE_PROP_ | grep -i iqr
>>> yields nothing so I'm not sure if it's acceptable. Typically it's board that assigns
>>> IRQ and not device, for Sysbus devices (see: sysbus_init_irq/sysbus_connect_irq).
>>> So I'd leave it upto Paolo or someone else to decide/comment on.
>>>
>>
>>Sounds like a plan, I'll try to come up with the test results
>>(at least for Windows 10 guest which is what I have setup) and update
>>this thread with the results.
>>
>>-- Jon.
>>
>>>>
>>>>>>
>>>>>>Paolo
>>>>>>
>>>>>
>>>>
>>>
>Hi guys,
>
>Sorry for the delay...
>
>So first ill clarify what was the test, the test was to see the device
>"Microsoft Hyper-V Virtual Machine Bus" in Windows Device Manager under
>"System devices" with a state of "working properly".
>
>It seems like it's ok to drop all the _PS* and _STA.
>
>It seems to be functioning with single IRQ as well, it is worth noting
>that even when i dropped the entire _CRS (so no IRQs resources are
>required, the device was still showing that it's functioning, but I
>suspect this might affect the child devices like hv-net and hv-scsi).
>
>With that said I did run into a small issue I set-up Win10 1903 (aka
>19H1) and it seems like VMBus now requires to have the following
>features enabled:
>HV_VP_RUNTIME_AVAILABLE
>HV_TIME_REF_COUNT_AVAILABLE
>HV_SYNIC_AVAILABLE
>HV_SYNTIMERS_AVAILABLE
>HV_APIC_ACCESS_AVAILABLE
>HV_HYPERCALL_AVAILABLE
>HV_VP_INDEX_AVAILABLE
>
>So notice that previously only SYNIC and VPINDEX was needed, now you
>need the whole thing so you need to run qemu with something like
>-cpu host,hv-relaxed,hv_spinlocks=0x1fff,hv_time,hv-vapic,hv-vpindex,hv-synic,hv-runtime,hv-stimer
>
>The validation was done in winhv!WinHvpCheckPartitionPrivileges .
>
>Paolo I noticed you have done a PULL request, would you like to wait
>on it and we will submit a version with a single IRQ (selectable by
>user property) and go with Igor's suggestion dropping _PS* and _STA
>(though like I said before I prefer to mimic the original HyperV with
>it's bugs, but I'll leave this decision to you).
>
>Also today VMBus only verifies SYNIC is enabled I'm not sure how but I
>wonder if we want to some how exports from the CPU which other HV
>features are enabled so we can verify all the required ones are set,
>would appreciate if you have any suggestions here.
>
>Cheers,
>-- Jon.
I got the latest DSDT from one of the latest builds 19041
Device (\_SB.VMOD.VMBS)
{
Name (STA, 0x0F)
Name (_ADR, Zero) // _ADR: Address
Name (_DDN, "VMBUS") // _DDN: DOS Device Name
Name (_HID, "VMBus") // _HID: Hardware ID
Name (_UID, Zero) // _UID: Unique ID
Method (_DIS, 0, NotSerialized) // _DIS: Disable Device
{
STA &= 0x0D
}
Method (_PS0, 0, NotSerialized) // _PS0: Power State 0
{
STA |= 0x0F
}
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (STA) /* \_SB_.VMOD.VMBS.STA_ */
}
Name (_PS3, Zero) // _PS3: Power State 3
Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
{
IRQ (Edge, ActiveHigh, Exclusive, )
{5}
})
}
So things looks the same...
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-06-14 14:11 ` Jon Doron
2020-06-14 15:20 ` Jon Doron
@ 2020-06-14 21:40 ` Maciej S. Szmigiero
2020-06-15 2:40 ` Jon Doron
1 sibling, 1 reply; 31+ messages in thread
From: Maciej S. Szmigiero @ 2020-06-14 21:40 UTC (permalink / raw)
To: Jon Doron
Cc: eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, Igor Mammedov, vkuznets
Hi Jon,
On 14.06.2020 16:11, Jon Doron wrote:
> On 28/05/2020, Jon Doron wrote:
>> On 28/05/2020, Igor Mammedov wrote:
>>> On Thu, 28 May 2020 08:26:42 +0300
>>> Jon Doron <arilou@gmail.com> wrote:
>>>
>>>> On 22/05/2020, Igor Mammedow wrote:
>>>>> On Thu, 21 May 2020 18:02:07 +0200
>>>>> Paolo Bonzini <pbonzini@redhat.com> wrote:
>>>>>
>>>>>> On 13/05/20 17:34, Igor Mammedov wrote:
>>>>>> > I'd rather avoid using random IRQ numbers (considering we are
>>>>>> > dealing with black-box here). So if it's really necessary to have
>>>>>> > IRQ described here, I'd suggest to implement them in device model
>>>>>> > so they would be reserved and QEMU would error out in a sane way if
>>>>>> > IRQ conflict is detected.
>>>>>>
>>>>>> We don't generally detect ISA IRQ conflicts though, do we?
>>>>>
>>>>> that I don't know that's why I'm not suggesting how to do it.
>>>>> The point is hard-coding in AML random IRQs is not right thing to do,
>>>>> (especially with the lack of 'any' spec), as minimum AML should pull
>>>>> it from device model and that probably should be configurable and set
>>>>> by board.
>>>>>
>>>>> Other thing is:
>>>>> I haven't looked at VMBus device model in detail, but DSDT part aren't
>>>>> matching device though (device model is not ISA device hence AML part
>>>>> shouldn't be on in ISA scope), where to put it is open question.
>>>>> There were other issues with AML code, I've commented on, so I was
>>>>> waiting on respin with comments addressed.
>>>>> I don't think that this patch is good enough for merging.
>>>>>
>>>>>
>>>>
>>>> But it seems like the current patch does match what's Microsoft HyperV
>>>> is publishing in it's APCI tables.
>>>>
>>>> I dont think it's correct for us to "fix" Microsoft emulation even if
>>>> it's wrong, since that's what Windows probably expects to see...
>>>>
>>>> I tried looking where Microsoft uses the ACPI tables to identify the
>>>> VMBus but without much luck in order to understand how flexible a change
>>>> would be for the OS to still detect the VMBus device, but in general
>>>> I think "correcting" something that is emulated 1:1 because there is no
>>>> spec is the right way.
>>>
>>> I'd agree, if removing nonsense would break VMBus detection (does it?).
>>> if something is that doesn't make sense but has to stay because it is need
>>> to make windows happy, that's fine , just add annotate is with comment,
>>> so it won't confuse anyone why that code exists there later on.
>>>
>>> I suggest to:
>>> 1. try dropping _PS* & _STA as it doesn't actually does anything and _PS3 is plain wrong
>>> 2. drop one IRQ, newer hyper-v seems to be doing fine with only one
>>> 3. it's not ISA device, I'd suggest to move into _SB scope
>>> 4. I don't know much about IRQs but
>>> git grep DEFINE_PROP_ | grep -i iqr
>>> yields nothing so I'm not sure if it's acceptable. Typically it's board that assigns
>>> IRQ and not device, for Sysbus devices (see: sysbus_init_irq/sysbus_connect_irq).
>>> So I'd leave it upto Paolo or someone else to decide/comment on.
>>>
>>
>> Sounds like a plan, I'll try to come up with the test results
>> (at least for Windows 10 guest which is what I have setup) and update
>> this thread with the results.
>>
>> -- Jon.
>>
>>>>
>>>>>>
>>>>>> Paolo
>>>>>>
>>>>>
>>>>
>>>
> Hi guys,
>
> Sorry for the delay...
>
> So first ill clarify what was the test, the test was to see the device
> "Microsoft Hyper-V Virtual Machine Bus" in Windows Device Manager under
> "System devices" with a state of "working properly".
>
> It seems like it's ok to drop all the _PS* and _STA.
>
> It seems to be functioning with single IRQ as well, it is worth noting that even when i dropped the entire _CRS (so no IRQs resources are required, the device was still showing that it's functioning, but I suspect this might affect the child devices like hv-net and hv-scsi).
I guess you tested a single Windows version, correct?
It may be that requirements differ between Windows versions, just as you
say below about the required enlightenments.
> With that said I did run into a small issue I set-up Win10 1903 (aka 19H1) and it seems like VMBus now requires to have the following features enabled:
> HV_VP_RUNTIME_AVAILABLE
> HV_TIME_REF_COUNT_AVAILABLE
> HV_SYNIC_AVAILABLE
> HV_SYNTIMERS_AVAILABLE
> HV_APIC_ACCESS_AVAILABLE
> HV_HYPERCALL_AVAILABLE
> HV_VP_INDEX_AVAILABLE
>
> So notice that previously only SYNIC and VPINDEX was needed, now you need the whole thing so you need to run qemu with something like
> -cpu host,hv-relaxed,hv_spinlocks=0x1fff,hv_time,hv-vapic,hv-vpindex,hv-synic,hv-runtime,hv-stimer
>
> The validation was done in winhv!WinHvpCheckPartitionPrivileges .
>
> Paolo I noticed you have done a PULL request, would you like to wait on it and we will submit a version with a single IRQ (selectable by user property) and go with Igor's suggestion dropping _PS* and _STA (though like I said before I prefer to mimic the original HyperV with it's bugs, but I'll leave this decision to you).
The code is already in the upstream QEMU tree, it's a known-working code,
so I think it is better to simply work incrementally on further improving
the current version rather than backing it out and merging it again later.
This way it will (hopefully) get some wider testing sooner.
Not to mention that it is less likely for some other QEMU change to
accidentally break it.
> Also today VMBus only verifies SYNIC is enabled I'm not sure how but I wonder if we want to some how exports from the CPU which other HV features are enabled so we can verify all the required ones are set, would appreciate if you have any suggestions here.
>
> Cheers,
> -- Jon.
Thanks,
Maciej
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-06-14 21:40 ` Maciej S. Szmigiero
@ 2020-06-15 2:40 ` Jon Doron
2020-06-15 6:54 ` Maciej S. Szmigiero
0 siblings, 1 reply; 31+ messages in thread
From: Jon Doron @ 2020-06-15 2:40 UTC (permalink / raw)
To: Maciej S. Szmigiero
Cc: eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, Igor Mammedov, vkuznets
On 14/06/2020, Maciej S. Szmigiero wrote:
>Hi Jon,
>
>On 14.06.2020 16:11, Jon Doron wrote:
>> On 28/05/2020, Jon Doron wrote:
>>> On 28/05/2020, Igor Mammedov wrote:
>>>> On Thu, 28 May 2020 08:26:42 +0300
>>>> Jon Doron <arilou@gmail.com> wrote:
>>>>
>>>>> On 22/05/2020, Igor Mammedow wrote:
>>>>>> On Thu, 21 May 2020 18:02:07 +0200
>>>>>> Paolo Bonzini <pbonzini@redhat.com> wrote:
>>>>>>
>>>>>>> On 13/05/20 17:34, Igor Mammedov wrote:
>>>>>>> > I'd rather avoid using random IRQ numbers (considering we are
>>>>>>> > dealing with black-box here). So if it's really necessary to have
>>>>>>> > IRQ described here, I'd suggest to implement them in device model
>>>>>>> > so they would be reserved and QEMU would error out in a sane way if
>>>>>>> > IRQ conflict is detected.
>>>>>>>
>>>>>>> We don't generally detect ISA IRQ conflicts though, do we?
>>>>>>
>>>>>> that I don't know that's why I'm not suggesting how to do it.
>>>>>> The point is hard-coding in AML random IRQs is not right thing to do,
>>>>>> (especially with the lack of 'any' spec), as minimum AML should pull
>>>>>> it from device model and that probably should be configurable and set
>>>>>> by board.
>>>>>>
>>>>>> Other thing is:
>>>>>> I haven't looked at VMBus device model in detail, but DSDT part aren't
>>>>>> matching device though (device model is not ISA device hence AML part
>>>>>> shouldn't be on in ISA scope), where to put it is open question.
>>>>>> There were other issues with AML code, I've commented on, so I was
>>>>>> waiting on respin with comments addressed.
>>>>>> I don't think that this patch is good enough for merging.
>>>>>>
>>>>>>
>>>>>
>>>>> But it seems like the current patch does match what's Microsoft HyperV
>>>>> is publishing in it's APCI tables.
>>>>>
>>>>> I dont think it's correct for us to "fix" Microsoft emulation even if
>>>>> it's wrong, since that's what Windows probably expects to see...
>>>>>
>>>>> I tried looking where Microsoft uses the ACPI tables to identify the
>>>>> VMBus but without much luck in order to understand how flexible a change
>>>>> would be for the OS to still detect the VMBus device, but in general
>>>>> I think "correcting" something that is emulated 1:1 because there is no
>>>>> spec is the right way.
>>>>
>>>> I'd agree, if removing nonsense would break VMBus detection (does it?).
>>>> if something is that doesn't make sense but has to stay because it is need
>>>> to make windows happy, that's fine , just add annotate is with comment,
>>>> so it won't confuse anyone why that code exists there later on.
>>>>
>>>> I suggest to:
>>>> 1. try dropping _PS* & _STA as it doesn't actually does anything and _PS3 is plain wrong
>>>> 2. drop one IRQ, newer hyper-v seems to be doing fine with only one
>>>> 3. it's not ISA device, I'd suggest to move into _SB scope
>>>> 4. I don't know much about IRQs but
>>>> git grep DEFINE_PROP_ | grep -i iqr
>>>> yields nothing so I'm not sure if it's acceptable. Typically it's board that assigns
>>>> IRQ and not device, for Sysbus devices (see: sysbus_init_irq/sysbus_connect_irq).
>>>> So I'd leave it upto Paolo or someone else to decide/comment on.
>>>>
>>>
>>> Sounds like a plan, I'll try to come up with the test results
>>> (at least for Windows 10 guest which is what I have setup) and update
>>> this thread with the results.
>>>
>>> -- Jon.
>>>
>>>>>
>>>>>>>
>>>>>>> Paolo
>>>>>>>
>>>>>>
>>>>>
>>>>
>> Hi guys,
>>
>> Sorry for the delay...
>>
>> So first ill clarify what was the test, the test was to see the device
>> "Microsoft Hyper-V Virtual Machine Bus" in Windows Device Manager under
>> "System devices" with a state of "working properly".
>>
>> It seems like it's ok to drop all the _PS* and _STA.
>>
>> It seems to be functioning with single IRQ as well, it is worth noting that even when i dropped the entire _CRS (so no IRQs resources are required, the device was still showing that it's functioning, but I suspect this might affect the child devices like hv-net and hv-scsi).
>
>I guess you tested a single Windows version, correct?
>It may be that requirements differ between Windows versions, just as you
>say below about the required enlightenments.
>
Yes I have tested only a single version, but from the looks of it there
is only a single IRQ in the HyperV APCI table that I have looked at, and
I believe the one you have pasted as well in the past, so that change
sounds reasonable to me.
As for the enlightenments dont you prefer to have all those as mandatory
for VMBus in order not to run into the issue I have encountered?
>> With that said I did run into a small issue I set-up Win10 1903 (aka 19H1) and it seems like VMBus now requires to have the following features enabled:
>> HV_VP_RUNTIME_AVAILABLE
>> HV_TIME_REF_COUNT_AVAILABLE
>> HV_SYNIC_AVAILABLE
>> HV_SYNTIMERS_AVAILABLE
>> HV_APIC_ACCESS_AVAILABLE
>> HV_HYPERCALL_AVAILABLE
>> HV_VP_INDEX_AVAILABLE
>>
>> So notice that previously only SYNIC and VPINDEX was needed, now you need the whole thing so you need to run qemu with something like
>> -cpu host,hv-relaxed,hv_spinlocks=0x1fff,hv_time,hv-vapic,hv-vpindex,hv-synic,hv-runtime,hv-stimer
>>
>> The validation was done in winhv!WinHvpCheckPartitionPrivileges .
>>
>> Paolo I noticed you have done a PULL request, would you like to wait on it and we will submit a version with a single IRQ (selectable by user property) and go with Igor's suggestion dropping _PS* and _STA (though like I said before I prefer to mimic the original HyperV with it's bugs, but I'll leave this decision to you).
>
>The code is already in the upstream QEMU tree, it's a known-working code,
>so I think it is better to simply work incrementally on further improving
>the current version rather than backing it out and merging it again later.
>
>This way it will (hopefully) get some wider testing sooner.
>
>Not to mention that it is less likely for some other QEMU change to
>accidentally break it.
>
That's great I agree incrementally is the right way here, should we open
another Thread to discuss all these changes or do you prefer we will
keep going on this one?
>> Also today VMBus only verifies SYNIC is enabled I'm not sure how but I wonder if we want to some how exports from the CPU which other HV features are enabled so we can verify all the required ones are set, would appreciate if you have any suggestions here.
>>
>> Cheers,
>> -- Jon.
>
>Thanks,
>Maciej
Thanks,
-- Jon.
^ permalink raw reply [flat|nested] 31+ messages in thread
* Re: [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry
2020-06-15 2:40 ` Jon Doron
@ 2020-06-15 6:54 ` Maciej S. Szmigiero
0 siblings, 0 replies; 31+ messages in thread
From: Maciej S. Szmigiero @ 2020-06-15 6:54 UTC (permalink / raw)
To: Jon Doron
Cc: eyakovlev, ehabkost, qemu-devel, Roman Kagan, liran.alon,
Roman Kagan, Paolo Bonzini, Igor Mammedov, vkuznets
On 15.06.2020 04:40, Jon Doron wrote:
> On 14/06/2020, Maciej S. Szmigiero wrote:
>> Hi Jon,
>>
>> On 14.06.2020 16:11, Jon Doron wrote:
>>> On 28/05/2020, Jon Doron wrote:
>>>> On 28/05/2020, Igor Mammedov wrote:
>>>>> On Thu, 28 May 2020 08:26:42 +0300
>>>>> Jon Doron <arilou@gmail.com> wrote:
>>>>>
>>>>>> On 22/05/2020, Igor Mammedow wrote:
>>>>>>> On Thu, 21 May 2020 18:02:07 +0200
>>>>>>> Paolo Bonzini <pbonzini@redhat.com> wrote:
>>>>>>>
>>>>>>>> On 13/05/20 17:34, Igor Mammedov wrote:
>>>>>>>> > I'd rather avoid using random IRQ numbers (considering we are
>>>>>>>> > dealing with black-box here). So if it's really necessary to have
>>>>>>>> > IRQ described here, I'd suggest to implement them in device model
>>>>>>>> > so they would be reserved and QEMU would error out in a sane way if
>>>>>>>> > IRQ conflict is detected.
>>>>>>>>
>>>>>>>> We don't generally detect ISA IRQ conflicts though, do we?
>>>>>>>
>>>>>>> that I don't know that's why I'm not suggesting how to do it.
>>>>>>> The point is hard-coding in AML random IRQs is not right thing to do,
>>>>>>> (especially with the lack of 'any' spec), as minimum AML should pull
>>>>>>> it from device model and that probably should be configurable and set
>>>>>>> by board.
>>>>>>>
>>>>>>> Other thing is:
>>>>>>> I haven't looked at VMBus device model in detail, but DSDT part aren't
>>>>>>> matching device though (device model is not ISA device hence AML part
>>>>>>> shouldn't be on in ISA scope), where to put it is open question.
>>>>>>> There were other issues with AML code, I've commented on, so I was
>>>>>>> waiting on respin with comments addressed.
>>>>>>> I don't think that this patch is good enough for merging.
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> But it seems like the current patch does match what's Microsoft HyperV
>>>>>> is publishing in it's APCI tables.
>>>>>>
>>>>>> I dont think it's correct for us to "fix" Microsoft emulation even if
>>>>>> it's wrong, since that's what Windows probably expects to see...
>>>>>>
>>>>>> I tried looking where Microsoft uses the ACPI tables to identify the
>>>>>> VMBus but without much luck in order to understand how flexible a change
>>>>>> would be for the OS to still detect the VMBus device, but in general
>>>>>> I think "correcting" something that is emulated 1:1 because there is no
>>>>>> spec is the right way.
>>>>>
>>>>> I'd agree, if removing nonsense would break VMBus detection (does it?).
>>>>> if something is that doesn't make sense but has to stay because it is need
>>>>> to make windows happy, that's fine , just add annotate is with comment,
>>>>> so it won't confuse anyone why that code exists there later on.
>>>>>
>>>>> I suggest to:
>>>>> 1. try dropping _PS* & _STA as it doesn't actually does anything and _PS3 is plain wrong
>>>>> 2. drop one IRQ, newer hyper-v seems to be doing fine with only one
>>>>> 3. it's not ISA device, I'd suggest to move into _SB scope
>>>>> 4. I don't know much about IRQs but
>>>>> git grep DEFINE_PROP_ | grep -i iqr
>>>>> yields nothing so I'm not sure if it's acceptable. Typically it's board that assigns
>>>>> IRQ and not device, for Sysbus devices (see: sysbus_init_irq/sysbus_connect_irq).
>>>>> So I'd leave it upto Paolo or someone else to decide/comment on.
>>>>>
>>>>
>>>> Sounds like a plan, I'll try to come up with the test results
>>>> (at least for Windows 10 guest which is what I have setup) and update
>>>> this thread with the results.
>>>>
>>>> -- Jon.
>>>>
>>>>>>
>>>>>>>>
>>>>>>>> Paolo
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>> Hi guys,
>>>
>>> Sorry for the delay...
>>>
>>> So first ill clarify what was the test, the test was to see the device
>>> "Microsoft Hyper-V Virtual Machine Bus" in Windows Device Manager under
>>> "System devices" with a state of "working properly".
>>>
>>> It seems like it's ok to drop all the _PS* and _STA.
>>>
>>> It seems to be functioning with single IRQ as well, it is worth noting that even when i dropped the entire _CRS (so no IRQs resources are required, the device was still showing that it's functioning, but I suspect this might affect the child devices like hv-net and hv-scsi).
>>
>> I guess you tested a single Windows version, correct?
>> It may be that requirements differ between Windows versions, just as you
>> say below about the required enlightenments.
>>
>
> Yes I have tested only a single version, but from the looks of it there is only a single IRQ in the HyperV APCI table that I have looked at, and I believe the one you have pasted as well in the past, so that change sounds reasonable to me.
I meant also other changes, like dropping of some ACPI methods.
> As for the enlightenments dont you prefer to have all those as mandatory for VMBus in order not to run into the issue I have encountered?
Well, if somebody wants to run only older guests they will be content with
just a limited set of enlightenments, right?
But I don't know what's the QEMU project policy is here.
>>> With that said I did run into a small issue I set-up Win10 1903 (aka 19H1) and it seems like VMBus now requires to have the following features enabled:
>>> HV_VP_RUNTIME_AVAILABLE
>>> HV_TIME_REF_COUNT_AVAILABLE
>>> HV_SYNIC_AVAILABLE
>>> HV_SYNTIMERS_AVAILABLE
>>> HV_APIC_ACCESS_AVAILABLE
>>> HV_HYPERCALL_AVAILABLE
>>> HV_VP_INDEX_AVAILABLE
>>>
>>> So notice that previously only SYNIC and VPINDEX was needed, now you need the whole thing so you need to run qemu with something like
>>> -cpu host,hv-relaxed,hv_spinlocks=0x1fff,hv_time,hv-vapic,hv-vpindex,hv-synic,hv-runtime,hv-stimer
>>>
>>> The validation was done in winhv!WinHvpCheckPartitionPrivileges .
>>>
>>> Paolo I noticed you have done a PULL request, would you like to wait on it and we will submit a version with a single IRQ (selectable by user property) and go with Igor's suggestion dropping _PS* and _STA (though like I said before I prefer to mimic the original HyperV with it's bugs, but I'll leave this decision to you).
>>
>> The code is already in the upstream QEMU tree, it's a known-working code,
>> so I think it is better to simply work incrementally on further improving
>> the current version rather than backing it out and merging it again later.
>>
>> This way it will (hopefully) get some wider testing sooner.
>>
>> Not to mention that it is less likely for some other QEMU change to
>> accidentally break it.
>>
>
> That's great I agree incrementally is the right way here, should we open another Thread to discuss all these changes or do you prefer we will keep going on this one?
If that's going to be an incremental change it is probably worth its
own email thread.
Otherwise the existing one will grow without bounds.
>>> Also today VMBus only verifies SYNIC is enabled I'm not sure how but I wonder if we want to some how exports from the CPU which other HV features are enabled so we can verify all the required ones are set, would appreciate if you have any suggestions here.
>>>
>
> Thanks,
> -- Jon.
Thanks,
Maciej
^ permalink raw reply [flat|nested] 31+ messages in thread
end of thread, other threads:[~2020-06-15 6:55 UTC | newest]
Thread overview: 31+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-24 12:34 [PATCH v4 0/6] hyperv: VMBus implementation Jon Doron
2020-04-24 12:34 ` [PATCH v4 1/6] hyperv: expose API to determine if synic is enabled Jon Doron
2020-04-24 12:34 ` [PATCH v4 2/6] vmbus: add vmbus protocol definitions Jon Doron
2020-04-24 12:34 ` [PATCH v4 3/6] vmbus: vmbus implementation Jon Doron
2020-04-24 12:34 ` [PATCH v4 4/6] i386:pc: whitelist dynamic vmbus-bridge Jon Doron
2020-04-24 12:34 ` [PATCH v4 5/6] i386: Hyper-V VMBus ACPI DSDT entry Jon Doron
2020-05-05 13:06 ` Igor Mammedov
2020-05-05 15:38 ` Jon Doron
2020-05-06 13:37 ` Maciej S. Szmigiero
2020-05-07 3:14 ` Jon Doron
2020-05-11 20:11 ` Roman Kagan
2020-05-13 15:37 ` Igor Mammedov
2020-05-15 8:56 ` Jon Doron
2020-05-15 12:35 ` Roman Kagan
2020-05-11 18:21 ` Roman Kagan
2020-05-13 15:34 ` Igor Mammedov
2020-05-21 16:02 ` Paolo Bonzini
2020-05-22 8:40 ` Igor Mammedow
2020-05-28 5:26 ` Jon Doron
2020-05-28 5:36 ` Jon Doron
2020-05-28 10:37 ` Igor Mammedov
2020-05-28 11:02 ` Jon Doron
2020-06-14 14:11 ` Jon Doron
2020-06-14 15:20 ` Jon Doron
2020-06-14 21:40 ` Maciej S. Szmigiero
2020-06-15 2:40 ` Jon Doron
2020-06-15 6:54 ` Maciej S. Szmigiero
2020-04-24 12:34 ` [PATCH v4 6/6] vmbus: add infrastructure to save/load vmbus requests Jon Doron
2020-05-21 16:03 ` [PATCH v4 0/6] hyperv: VMBus implementation Paolo Bonzini
2020-05-22 2:53 ` Jon Doron
2020-05-22 7:19 ` Paolo Bonzini
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