s390x/tod-kvm: don't save/restore the TOD in PV guests

Under PV, the guest's TOD clock is under control of the ultravisor and the
hypervisor cannot change it.

With upcoming kernel changes[1], the Linux kernel will reject QEMU's
request to adjust the guest's clock in this case, so don't attempt to set
the clock.

This avoids the following warning message on save/restore of a PV guest:

warning: Unable to set KVM guest TOD clock: Operation not supported

[1] https://lore.kernel.org/all/20221011160712.928239-2-nrb@linux.ibm.com/

Fixes: c3347ed0d2ee ("s390x: protvirt: Support unpack facility")
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Message-Id: <20221012123229.1196007-1-nrb@linux.ibm.com>
[thuth: Add curly braces]
Signed-off-by: Thomas Huth <thuth@redhat.com>

diff --git a/hw/s390x/tod-kvm.c b/hw/s390x/tod-kvm.c
index 9d0cbfbce2bf56b3593d712bd0829b33cf8677b4..e2202dae2dc203a2848a3d0faaafe0a4698d654b 100644 (file)
--- a/hw/s390x/tod-kvm.c
+++ b/hw/s390x/tod-kvm.c
@@ -13,6 +13,7 @@
 #include "qemu/module.h"
 #include "sysemu/runstate.h"
 #include "hw/s390x/tod.h"
+#include "hw/s390x/pv.h"
 #include "kvm/kvm_s390x.h"
 
 static void kvm_s390_get_tod_raw(S390TOD *tod, Error **errp)
@@ -84,6 +85,14 @@ static void kvm_s390_tod_vm_state_change(void *opaque, bool running,
     S390TODState *td = opaque;
     Error *local_err = NULL;
 
+    /*
+     * Under PV, the clock is under ultravisor control, hence we cannot restore
+     * it on resume.
+     */
+    if (s390_is_pv()) {
+        return;
+    }
+
     if (running && td->stopped) {
         /* Set the old TOD when running the VM - start the TOD clock. */
         kvm_s390_set_tod_raw(&td->base, &local_err);