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[PATCH QEMU v23 08/18] vfio: Register SaveVMHandlers for VFIO device
From: |
Kirti Wankhede |
Subject: |
[PATCH QEMU v23 08/18] vfio: Register SaveVMHandlers for VFIO device |
Date: |
Wed, 20 May 2020 23:54:38 +0530 |
Define flags to be used as delimeter in migration file stream.
Added .save_setup and .save_cleanup functions. Mapped & unmapped migration
region from these functions at source during saving or pre-copy phase.
Set VFIO device state depending on VM's state. During live migration, VM is
running when .save_setup is called, _SAVING | _RUNNING state is set for VFIO
device. During save-restore, VM is paused, _SAVING state is set for VFIO device.
Signed-off-by: Kirti Wankhede <address@hidden>
Reviewed-by: Neo Jia <address@hidden>
---
hw/vfio/migration.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio/trace-events | 2 ++
2 files changed, 75 insertions(+)
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index c2f5564b51c3..773c8d16b1c1 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -8,12 +8,14 @@
*/
#include "qemu/osdep.h"
+#include "qemu/main-loop.h"
#include <linux/vfio.h>
#include "sysemu/runstate.h"
#include "hw/vfio/vfio-common.h"
#include "cpu.h"
#include "migration/migration.h"
+#include "migration/vmstate.h"
#include "migration/qemu-file.h"
#include "migration/register.h"
#include "migration/blocker.h"
@@ -24,6 +26,17 @@
#include "pci.h"
#include "trace.h"
+/*
+ * Flags used as delimiter:
+ * 0xffffffff => MSB 32-bit all 1s
+ * 0xef10 => emulated (virtual) function IO
+ * 0x0000 => 16-bits reserved for flags
+ */
+#define VFIO_MIG_FLAG_END_OF_STATE (0xffffffffef100001ULL)
+#define VFIO_MIG_FLAG_DEV_CONFIG_STATE (0xffffffffef100002ULL)
+#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL)
+#define VFIO_MIG_FLAG_DEV_DATA_STATE (0xffffffffef100004ULL)
+
static void vfio_migration_region_exit(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
@@ -126,6 +139,64 @@ static int vfio_migration_set_state(VFIODevice *vbasedev,
uint32_t mask,
return 0;
}
+/* ---------------------------------------------------------------------- */
+
+static int vfio_save_setup(QEMUFile *f, void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+ int ret;
+
+ trace_vfio_save_setup(vbasedev->name);
+
+ qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE);
+
+ if (migration->region.mmaps) {
+ qemu_mutex_lock_iothread();
+ ret = vfio_region_mmap(&migration->region);
+ qemu_mutex_unlock_iothread();
+ if (ret) {
+ error_report("%s: Failed to mmap VFIO migration region %d: %s",
+ vbasedev->name, migration->region.index,
+ strerror(-ret));
+ return ret;
+ }
+ }
+
+ ret = vfio_migration_set_state(vbasedev, ~0, VFIO_DEVICE_STATE_SAVING);
+ if (ret) {
+ error_report("%s: Failed to set state SAVING", vbasedev->name);
+ return ret;
+ }
+
+ qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
+
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ return ret;
+ }
+
+ return 0;
+}
+
+static void vfio_save_cleanup(void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+
+ if (migration->region.mmaps) {
+ vfio_region_unmap(&migration->region);
+ }
+ trace_vfio_save_cleanup(vbasedev->name);
+}
+
+static SaveVMHandlers savevm_vfio_handlers = {
+ .save_setup = vfio_save_setup,
+ .save_cleanup = vfio_save_cleanup,
+};
+
+/* ---------------------------------------------------------------------- */
+
static void vfio_vmstate_change(void *opaque, int running, RunState state)
{
VFIODevice *vbasedev = opaque;
@@ -192,6 +263,8 @@ static int vfio_migration_init(VFIODevice *vbasedev,
return ret;
}
+ register_savevm_live("vfio", VMSTATE_INSTANCE_ID_ANY, 1,
+ &savevm_vfio_handlers, vbasedev);
vbasedev->vm_state = qemu_add_vm_change_state_handler(vfio_vmstate_change,
vbasedev);
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index bd3d47b005cb..86c18def016e 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -149,3 +149,5 @@ vfio_migration_probe(const char *name, uint32_t index) "
(%s) Region %d"
vfio_migration_set_state(const char *name, uint32_t state) " (%s) state %d"
vfio_vmstate_change(const char *name, int running, const char *reason,
uint32_t dev_state) " (%s) running %d reason %s device state %d"
vfio_migration_state_notifier(const char *name, const char *state) " (%s)
state %s"
+vfio_save_setup(const char *name) " (%s)"
+vfio_save_cleanup(const char *name) " (%s)"
--
2.7.0
[PATCH QEMU v23 09/18] vfio: Add save state functions to SaveVMHandlers, Kirti Wankhede, 2020/05/20
[PATCH QEMU v23 10/18] vfio: Add load state functions to SaveVMHandlers, Kirti Wankhede, 2020/05/20
[PATCH QEMU v23 11/18] iommu: add callback to get address limit IOMMU supports, Kirti Wankhede, 2020/05/20