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From 9764a6c484d4f3586b0e0be33e8c53de63b11edd Mon Sep 17 00:00:00 2001
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Message-Id: <9764a6c484d4f3586b0e0be33e8c53de63b11edd@dist-git>
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From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
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Date: Thu, 21 Jul 2022 19:29:13 +0200
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Subject: [PATCH] qemu: query QEMU for migration blockers before our own
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harcoded checks
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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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Since QEMU 6.0, if QEMU knows that a migration would fail,
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'query-migrate' will return an array of error strings describing the
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migration blockers. This can be used to check whether there are any
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devices/conditions blocking migration.
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This patch adds a call to this query at the top of
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qemuMigrationSrcIsAllowed().
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
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Reviewed-by: Laine Stump <laine@redhat.com>
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(cherry picked from commit 156e99f686690855be4e45d9b8b3194191a8bc31)
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Resolves: https://bugzilla.redhat.com/2092833
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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---
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src/qemu/qemu_migration.c | 30 ++++++++++++++++++++++++++++++
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1 file changed, 30 insertions(+)
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diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
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index 2a6b7b7819..cfb7626bb0 100644
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--- a/src/qemu/qemu_migration.c
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+++ b/src/qemu/qemu_migration.c
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@@ -1415,6 +1415,22 @@ qemuMigrationSrcIsAllowedHostdev(const virDomainDef *def)
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}
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+static int
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+qemuDomainGetMigrationBlockers(virQEMUDriver *driver,
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+ virDomainObj *vm,
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+ char ***blockers)
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+{
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+ qemuDomainObjPrivate *priv = vm->privateData;
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+ int rc;
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+
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+ qemuDomainObjEnterMonitor(driver, vm);
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+ rc = qemuMonitorGetMigrationBlockers(priv->mon, blockers);
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+ qemuDomainObjExitMonitor(vm);
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+
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+ return rc;
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+}
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+
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+
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/**
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* qemuMigrationSrcIsAllowed:
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* @driver: qemu driver struct
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@@ -1440,6 +1456,20 @@ qemuMigrationSrcIsAllowed(virQEMUDriver *driver,
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int pauseReason;
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size_t i;
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+ /* Ask qemu if it has a migration blocker */
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+ if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATION_BLOCKED_REASONS)) {
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+ g_auto(GStrv) blockers = NULL;
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+ if (qemuDomainGetMigrationBlockers(driver, vm, &blockers) < 0)
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+ return false;
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+
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+ if (blockers && blockers[0]) {
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+ g_autofree char *reasons = g_strjoinv("; ", blockers);
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+ virReportError(VIR_ERR_OPERATION_INVALID,
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+ _("cannot migrate domain: %s"), reasons);
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+ return false;
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+ }
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+ }
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+
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/* perform these checks only when migrating to remote hosts */
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if (remote) {
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nsnapshots = virDomainSnapshotObjListNum(vm->snapshots, NULL, 0);
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--
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2.35.1
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