From: "Collin L. Walling" <walling@xxxxxxxxxxxxxxxxxx>
Warn the user when migrating a guest that is using the host-passthrough cpu
mode. host-passthrough is not migration safe because the host hypervisor is not
attempting to block features that may not exist on the destination host.
Signed-off-by: Collin L. Walling <walling@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jason J. Herne <jjherne@xxxxxxxxxxxxxxxxxx>
---
src/qemu/qemu_migration.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index d4a55d8..f721de7 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -3151,6 +3151,10 @@ qemuMigrationBeginPhase(virQEMUDriverPtr driver,
if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT)
qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_BEGIN3);
+ if (vm->def->cpu && vm->def->cpu->mode == VIR_CPU_MODE_HOST_PASSTHROUGH)
+ VIR_WARN("cpu mode 'host-passthrough' may fail migration if destination"
+ " machine is running an older cpu model.");
+
if (!qemuMigrationIsAllowed(driver, vm, true, flags))
goto cleanup;
--
1.9.1
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