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From 90fcfe4b07afc5299c5ee69fa663ca46b597fd4b Mon Sep 17 00:00:00 2001
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From: Nico Boehr <nrb@linux.ibm.com>
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Date: Wed, 12 Oct 2022 14:32:29 +0200
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Subject: [PATCH] s390x/tod-kvm: don't save/restore the TOD in PV guests
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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: 244: s390x/tod-kvm: don't save/restore the TOD in PV guests
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RH-Bugzilla: 2155448
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Commit: [1/1] 3cb3154dd7c1549c54cf8c0483b5f23b235f6db3
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Under PV, the guest's TOD clock is under control of the ultravisor and the
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hypervisor cannot change it.
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With upcoming kernel changes[1], the Linux kernel will reject QEMU's
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request to adjust the guest's clock in this case, so don't attempt to set
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the clock.
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This avoids the following warning message on save/restore of a PV guest:
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warning: Unable to set KVM guest TOD clock: Operation not supported
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[1] https://lore.kernel.org/all/20221011160712.928239-2-nrb@linux.ibm.com/
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Fixes: c3347ed0d2ee ("s390x: protvirt: Support unpack facility")
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Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
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Message-Id: <20221012123229.1196007-1-nrb@linux.ibm.com>
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[thuth: Add curly braces]
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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(cherry picked from commit 38621181ae3cbec62e3490fbc14f6ac01642d07a)
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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hw/s390x/tod-kvm.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/hw/s390x/tod-kvm.c b/hw/s390x/tod-kvm.c
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index ec855811ae..c804c979b5 100644
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--- a/hw/s390x/tod-kvm.c
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+++ b/hw/s390x/tod-kvm.c
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@@ -13,6 +13,7 @@
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#include "qemu/module.h"
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#include "sysemu/runstate.h"
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#include "hw/s390x/tod.h"
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+#include "hw/s390x/pv.h"
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#include "kvm/kvm_s390x.h"
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static void kvm_s390_get_tod_raw(S390TOD *tod, Error **errp)
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@@ -84,6 +85,14 @@ static void kvm_s390_tod_vm_state_change(void *opaque, bool running,
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S390TODState *td = opaque;
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Error *local_err = NULL;
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+ /*
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+ * Under PV, the clock is under ultravisor control, hence we cannot restore
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+ * it on resume.
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+ */
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+ if (s390_is_pv()) {
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+ return;
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+ }
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+
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if (running && td->stopped) {
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/* Set the old TOD when running the VM - start the TOD clock. */
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kvm_s390_set_tod_raw(&td->base, &local_err);
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--
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2.37.3
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