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qemu-kvm/SOURCES/kvm-vfio-migration-Reset-by...

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5.4 KiB

From a63b4010ba4f491c9144afff363bebcf35ecf496 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
Date: Wed, 12 Jul 2023 17:46:57 +0200
Subject: [PATCH 20/37] vfio/migration: Reset bytes_transferred properly
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Cédric Le Goater <clg@redhat.com>
RH-MergeRequest: 179: vfio: live migration support
RH-Bugzilla: 2192818
RH-Acked-by: Eric Auger <eric.auger@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [18/28] e9a70faeca4fd5aa7ef36502cf76bf0b62f65057 (clegoate/qemu-kvm-c9s)
Bugzilla: https://bugzilla.redhat.com/2192818
commit 808642a2f640
Author: Avihai Horon <avihaih@nvidia.com>
Date: Wed Jun 28 10:31:11 2023 +0300
vfio/migration: Reset bytes_transferred properly
Currently, VFIO bytes_transferred is not reset properly:
1. bytes_transferred is not reset after a VM snapshot (so a migration
following a snapshot will report incorrect value).
2. bytes_transferred is a single counter for all VFIO devices, however
upon migration failure it is reset multiple times, by each VFIO
device.
Fix it by introducing a new function vfio_reset_bytes_transferred() and
calling it during migration and snapshot start.
Remove existing bytes_transferred reset in VFIO migration state
notifier, which is not needed anymore.
Fixes: 3710586caa5d ("qapi: Add VFIO devices migration stats in Migration stats")
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Conflicts:
- migration/migration.c
migration/savevm.c
context changes due to commit aff3f6606d14 ("migration: Rename
ram_counters to mig_stats")
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
hw/vfio/migration.c | 6 +++++-
include/hw/vfio/vfio-common.h | 1 +
migration/migration.c | 1 +
migration/migration.h | 1 +
migration/savevm.c | 1 +
migration/target.c | 17 +++++++++++++++--
6 files changed, 24 insertions(+), 3 deletions(-)
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index acbf0bb7ab..7cf143926c 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -697,7 +697,6 @@ static void vfio_migration_state_notifier(Notifier *notifier, void *data)
case MIGRATION_STATUS_CANCELLING:
case MIGRATION_STATUS_CANCELLED:
case MIGRATION_STATUS_FAILED:
- bytes_transferred = 0;
/*
* If setting the device in RUNNING state fails, the device should
* be reset. To do so, use ERROR state as a recover state.
@@ -818,6 +817,11 @@ int64_t vfio_mig_bytes_transferred(void)
return bytes_transferred;
}
+void vfio_reset_bytes_transferred(void)
+{
+ bytes_transferred = 0;
+}
+
int vfio_migration_realize(VFIODevice *vbasedev, Error **errp)
{
int ret = -ENOTSUP;
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 6d1b8487c3..1d19c6f251 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -229,6 +229,7 @@ int vfio_block_multiple_devices_migration(Error **errp);
void vfio_unblock_multiple_devices_migration(void);
int vfio_block_giommu_migration(Error **errp);
int64_t vfio_mig_bytes_transferred(void);
+void vfio_reset_bytes_transferred(void);
#ifdef CONFIG_LINUX
int vfio_get_region_info(VFIODevice *vbasedev, int index,
diff --git a/migration/migration.c b/migration/migration.c
index 9bf1caee6c..47ad6c43cb 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1638,6 +1638,7 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc,
*/
memset(&ram_counters, 0, sizeof(ram_counters));
memset(&compression_counters, 0, sizeof(compression_counters));
+ reset_vfio_bytes_transferred();
return true;
}
diff --git a/migration/migration.h b/migration/migration.h
index e9679f8029..7ccf460aa2 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -495,6 +495,7 @@ bool migration_rate_limit(void);
void migration_cancel(const Error *error);
void populate_vfio_info(MigrationInfo *info);
+void reset_vfio_bytes_transferred(void);
void postcopy_temp_page_reset(PostcopyTmpPage *tmp_page);
#endif
diff --git a/migration/savevm.c b/migration/savevm.c
index aff70e6263..83088fc3f8 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1620,6 +1620,7 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
migrate_init(ms);
memset(&ram_counters, 0, sizeof(ram_counters));
memset(&compression_counters, 0, sizeof(compression_counters));
+ reset_vfio_bytes_transferred();
ms->to_dst_file = f;
qemu_mutex_unlock_iothread();
diff --git a/migration/target.c b/migration/target.c
index 00ca007f97..f39c9a8d88 100644
--- a/migration/target.c
+++ b/migration/target.c
@@ -14,12 +14,25 @@
#include "hw/vfio/vfio-common.h"
#endif
+#ifdef CONFIG_VFIO
void populate_vfio_info(MigrationInfo *info)
{
-#ifdef CONFIG_VFIO
if (vfio_mig_active()) {
info->vfio = g_malloc0(sizeof(*info->vfio));
info->vfio->transferred = vfio_mig_bytes_transferred();
}
-#endif
}
+
+void reset_vfio_bytes_transferred(void)
+{
+ vfio_reset_bytes_transferred();
+}
+#else
+void populate_vfio_info(MigrationInfo *info)
+{
+}
+
+void reset_vfio_bytes_transferred(void)
+{
+}
+#endif
--
2.39.3