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Re: [Qemu-devel] [PATCH v7 06/13] vfio: Add VM state change handler to k
From: |
Kirti Wankhede |
Subject: |
Re: [Qemu-devel] [PATCH v7 06/13] vfio: Add VM state change handler to know state of VM |
Date: |
Fri, 12 Jul 2019 00:44:03 +0530 |
On 7/11/2019 5:43 PM, Dr. David Alan Gilbert wrote:
> * Kirti Wankhede (address@hidden) wrote:
>> VM state change handler gets called on change in VM's state. This is used to
>> set
>> VFIO device state to _RUNNING.
>> VM state change handler, migration state change handler and log_sync listener
>> are called asynchronously, which sometimes lead to data corruption in
>> migration
>> region. Initialised mutex that is used to serialize operations on migration
>> data
>> region during saving state.
>>
>> Signed-off-by: Kirti Wankhede <address@hidden>
>> Reviewed-by: Neo Jia <address@hidden>
>> ---
>> hw/vfio/migration.c | 64
>> +++++++++++++++++++++++++++++++++++++++++++
>> hw/vfio/trace-events | 2 ++
>> include/hw/vfio/vfio-common.h | 4 +++
>> 3 files changed, 70 insertions(+)
>>
>> diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
>> index a2cfbd5af2e1..c01f08b659d0 100644
>> --- a/hw/vfio/migration.c
>> +++ b/hw/vfio/migration.c
>> @@ -78,6 +78,60 @@ err:
>> return ret;
>> }
>>
>> +static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t state)
>> +{
>> + VFIOMigration *migration = vbasedev->migration;
>> + VFIORegion *region = &migration->region.buffer;
>> + uint32_t device_state;
>> + int ret = 0;
>> +
>> + device_state = (state & VFIO_DEVICE_STATE_MASK) |
>> + (vbasedev->device_state & ~VFIO_DEVICE_STATE_MASK);
>> +
>> + if ((device_state & VFIO_DEVICE_STATE_MASK) ==
>> VFIO_DEVICE_STATE_INVALID) {
>> + return -EINVAL;
>> + }
>> +
>> + ret = pwrite(vbasedev->fd, &device_state, sizeof(device_state),
>> + region->fd_offset + offsetof(struct
>> vfio_device_migration_info,
>> + device_state));
>> + if (ret < 0) {
>> + error_report("%s: Failed to set device state %d %s",
>> + vbasedev->name, ret, strerror(errno));
>> + return ret;
>> + }
>> +
>> + vbasedev->device_state = device_state;
>> + trace_vfio_migration_set_state(vbasedev->name, device_state);
>> + return 0;
>> +}
>> +
>> +static void vfio_vmstate_change(void *opaque, int running, RunState state)
>> +{
>> + VFIODevice *vbasedev = opaque;
>> +
>> + if ((vbasedev->vm_running != running)) {
>> + int ret;
>> + uint32_t dev_state;
>> +
>> + if (running) {
>> + dev_state = VFIO_DEVICE_STATE_RUNNING;
>> + } else {
>> + dev_state = (vbasedev->device_state & VFIO_DEVICE_STATE_MASK) &
>> + ~VFIO_DEVICE_STATE_RUNNING;
>> + }
>> +
>> + ret = vfio_migration_set_state(vbasedev, dev_state);
>> + if (ret) {
>> + error_report("%s: Failed to set device state 0x%x",
>> + vbasedev->name, dev_state);
>> + }
>> + vbasedev->vm_running = running;
>> + trace_vfio_vmstate_change(vbasedev->name, running,
>> RunState_str(state),
>> + dev_state);
>> + }
>> +}
>> +
>> static int vfio_migration_init(VFIODevice *vbasedev,
>> struct vfio_region_info *info)
>> {
>> @@ -93,6 +147,11 @@ static int vfio_migration_init(VFIODevice *vbasedev,
>> return ret;
>> }
>>
>> + qemu_mutex_init(&vbasedev->migration->lock);
>
> Does this and it's friend below belong in this patch? As far as I can
> tell you init/deinit the lock here but don't use it which is strange.
>
This lock is used in
0009-vfio-Add-save-state-functions-to-SaveVMHandlers.patch and
0011-vfio-Add-function-to-get-dirty-page-list.patch
Hm. I'll move this init/deinit to patch 0009 in next iteration.
Thanks,
Kirti
> Dave
>
>> + vbasedev->vm_state =
>> qemu_add_vm_change_state_handler(vfio_vmstate_change,
>> + vbasedev);
>> +
>> return 0;
>> }
>>
>> @@ -135,11 +194,16 @@ void vfio_migration_finalize(VFIODevice *vbasedev)
>> return;
>> }
>>
>> + if (vbasedev->vm_state) {
>> + qemu_del_vm_change_state_handler(vbasedev->vm_state);
>> + }
>> +
>> if (vbasedev->migration_blocker) {
>> migrate_del_blocker(vbasedev->migration_blocker);
>> error_free(vbasedev->migration_blocker);
>> }
>>
>> + qemu_mutex_destroy(&vbasedev->migration->lock);
>> vfio_migration_region_exit(vbasedev);
>> g_free(vbasedev->migration);
>> }
>> diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
>> index 191a726a1312..3d15bacd031a 100644
>> --- a/hw/vfio/trace-events
>> +++ b/hw/vfio/trace-events
>> @@ -146,3 +146,5 @@ vfio_display_edid_write_error(void) ""
>>
>> # migration.c
>> vfio_migration_probe(char *name, uint32_t index) " (%s) Region %d"
>> +vfio_migration_set_state(char *name, uint32_t state) " (%s) state %d"
>> +vfio_vmstate_change(char *name, int running, const char *reason, uint32_t
>> dev_state) " (%s) running %d reason %s device state %d"
>> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
>> index 152da3f8d6f3..f6c70db3a9c1 100644
>> --- a/include/hw/vfio/vfio-common.h
>> +++ b/include/hw/vfio/vfio-common.h
>> @@ -29,6 +29,7 @@
>> #ifdef CONFIG_LINUX
>> #include <linux/vfio.h>
>> #endif
>> +#include "sysemu/sysemu.h"
>>
>> #define VFIO_MSG_PREFIX "vfio %s: "
>>
>> @@ -124,6 +125,9 @@ typedef struct VFIODevice {
>> unsigned int flags;
>> VFIOMigration *migration;
>> Error *migration_blocker;
>> + uint32_t device_state;
>> + VMChangeStateEntry *vm_state;
>> + int vm_running;
>> } VFIODevice;
>>
>> struct VFIODeviceOps {
>> --
>> 2.7.0
>>
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK
>
- Re: [Qemu-devel] [PATCH v7 03/13] vfio: Add vfio_get_object callback to VFIODeviceOps, (continued)
- [Qemu-devel] [PATCH v7 04/13] vfio: Add save and load functions for VFIO PCI devices, Kirti Wankhede, 2019/07/09
- [Qemu-devel] [PATCH v7 05/13] vfio: Add migration region initialization and finalize function, Kirti Wankhede, 2019/07/09
- [Qemu-devel] [PATCH v7 06/13] vfio: Add VM state change handler to know state of VM, Kirti Wankhede, 2019/07/09
- Re: [Qemu-devel] [PATCH v7 06/13] vfio: Add VM state change handler to know state of VM, Alex Williamson, 2019/07/16
- Re: [Qemu-devel] [PATCH v7 06/13] vfio: Add VM state change handler to know state of VM, Yan Zhao, 2019/07/22
- [Qemu-devel] [PATCH v7 07/13] vfio: Add migration state change notifier, Kirti Wankhede, 2019/07/09
- [Qemu-devel] [PATCH v7 08/13] vfio: Register SaveVMHandlers for VFIO device, Kirti Wankhede, 2019/07/09
- [Qemu-devel] [PATCH v7 09/13] vfio: Add save state functions to SaveVMHandlers, Kirti Wankhede, 2019/07/09