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91 lines
3.0 KiB
91 lines
3.0 KiB
From df7814de08c8c7c45eacb7b9d9ead9be4d1e3baf Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
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Date: Mon, 11 Sep 2023 16:10:19 +0200
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Subject: [PATCH 4/4] vfio/migration: Block VFIO migration with postcopy
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migration
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 318: VFIO migration: fix a QEMU crash when postcopy is enabled
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RH-Bugzilla: 2229868
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RH-Acked-by: Alex Williamson <None>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Commit: [4/4] 36eedf879547044c2ba2763fb48784a95f9e4ea7
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Bugzilla: https://bugzilla.redhat.com/2229868
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commit bf7ef7a2da3e61dc104f26c679c9465e3fbe7dde
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Author: Avihai Horon <avihaih@nvidia.com>
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Date: Wed Sep 6 18:08:52 2023 +0300
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vfio/migration: Block VFIO migration with postcopy migration
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VFIO migration is not compatible with postcopy migration. A VFIO device
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in the destination can't handle page faults for pages that have not been
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sent yet.
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Doing such migration will cause the VM to crash in the destination:
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qemu-system-x86_64: VFIO_MAP_DMA failed: Bad address
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qemu-system-x86_64: vfio_dma_map(0x55a28c7659d0, 0xc0000, 0xb000, 0x7f1b11a00000) = -14 (Bad address)
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qemu: hardware error: vfio: DMA mapping failed, unable to continue
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To prevent this, block VFIO migration with postcopy migration.
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Reported-by: Yanghang Liu <yanghliu@redhat.com>
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Signed-off-by: Avihai Horon <avihaih@nvidia.com>
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Tested-by: Yanghang Liu <yanghliu@redhat.com>
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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hw/vfio/migration.c | 22 ++++++++++++++++++++++
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1 file changed, 22 insertions(+)
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diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
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index 2674f4bc47..4f018c7531 100644
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--- a/hw/vfio/migration.c
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+++ b/hw/vfio/migration.c
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@@ -331,6 +331,27 @@ static bool vfio_precopy_supported(VFIODevice *vbasedev)
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/* ---------------------------------------------------------------------- */
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+static int vfio_save_prepare(void *opaque, Error **errp)
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+{
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+ VFIODevice *vbasedev = opaque;
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+
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+ /*
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+ * Snapshot doesn't use postcopy, so allow snapshot even if postcopy is on.
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+ */
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+ if (runstate_check(RUN_STATE_SAVE_VM)) {
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+ return 0;
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+ }
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+
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+ if (migrate_postcopy_ram()) {
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+ error_setg(
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+ errp, "%s: VFIO migration is not supported with postcopy migration",
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+ vbasedev->name);
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+ return -EOPNOTSUPP;
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+ }
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+
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+ return 0;
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+}
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+
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static int vfio_save_setup(QEMUFile *f, void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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@@ -630,6 +651,7 @@ static bool vfio_switchover_ack_needed(void *opaque)
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}
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static const SaveVMHandlers savevm_vfio_handlers = {
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+ .save_prepare = vfio_save_prepare,
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.save_setup = vfio_save_setup,
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.save_cleanup = vfio_save_cleanup,
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.state_pending_estimate = vfio_state_pending_estimate,
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--
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2.39.3
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