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From 84cedeca547585a51f6044186d241a501ff757d2 Mon Sep 17 00:00:00 2001
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Message-Id: <84cedeca547585a51f6044186d241a501ff757d2@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Mon, 31 Jan 2022 12:55:47 +0100
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Subject: [PATCH] qemu: Validate domain definition even on migration
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When we are about to spawn QEMU, we validate the domain
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definition against qemuCaps. Except when domain is/was already
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running before (i.e. on incoming migration, snapshots, resume
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from a file). However, especially on incoming migration it may
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happen that the destination QEMU is different to the source
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QEMU, e.g. the destination QEMU may have some devices disabled.
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And we have a function that validates devices/features requested
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in domain XML against the desired QEMU capabilities (aka
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qemuCaps) - it's virDomainDefValidate() which calls
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qemuValidateDomainDef() and qemuValidateDomainDeviceDef()
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subsequently.
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But the problem here is that the validation function is
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explicitly skipped over in specific scenarios (like incoming
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migration, restore from a snapshot or previously saved file).
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This in turn means that we may spawn QEMU and request
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device/features it doesn't support. When that happens QEMU fails
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to load migration stream:
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qemu-kvm: ... 'virtio-mem-pci' is not a valid device model name
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(NB, while the example shows one particular device, the problem
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is paramount)
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This problem is easier to run into since we are slowly moving
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validation from qemu_command.c into said validation functions.
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The solution is simple: do the validation in all cases. And while
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it may happen that users would be unable to migrate/restore a
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guest due to a bug in our validator, spawning QEMU without
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validation is worse (especially when you consider that users can
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supply their own XMLs for migrate/restore operations - these were
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never validated).
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2048435
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Peter Krempa <pkrempa@redhat.com>
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(cherry picked from commit 517b8c12b98d7ac0bb4d582e0b491d50d776eb6d)
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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---
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src/qemu/qemu_process.c | 6 +-----
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1 file changed, 1 insertion(+), 5 deletions(-)
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diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
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index 5c9ca0fe4f..5c6657a876 100644
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--- a/src/qemu/qemu_process.c
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+++ b/src/qemu/qemu_process.c
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@@ -5411,11 +5411,7 @@ qemuProcessStartValidate(virQEMUDriver *driver,
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}
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- /* Checks below should not be executed when starting a qemu process for a
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- * VM that was running before (migration, snapshots, save). It's more
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- * important to start such VM than keep the configuration clean */
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- if ((flags & VIR_QEMU_PROCESS_START_NEW) &&
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- virDomainDefValidate(vm->def, 0, driver->xmlopt, qemuCaps) < 0)
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+ if (virDomainDefValidate(vm->def, 0, driver->xmlopt, qemuCaps) < 0)
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return -1;
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if (qemuProcessStartValidateGraphics(vm) < 0)
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--
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2.35.1
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