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[7/7] kvmclock: guest stop notification

Message ID f349c12c0434e29c79ecde89029320c4002f7253.1334280761.git.mtosatti@redhat.com
State New
Headers show

Commit Message

Marcelo Tosatti April 13, 2012, 1:32 a.m. UTC 
From: Eric B Munson <emunson@mgebm.net>

Often when a guest is stopped from the qemu console, it will report spurious
soft lockup warnings on resume.  There are kernel patches being discussed that
will give the host the ability to tell the guest that it is being stopped and
should ignore the soft lockup warning that generates.  This patch uses the qemu
Notifier system to tell the guest it is about to be stopped.

Signed-off-by: Eric B Munson <emunson@mgebm.net>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
 hw/kvm/clock.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/hw/kvm/clock.c b/hw/kvm/clock.c
index 446bd62..824b978 100644
--- a/hw/kvm/clock.c
+++ b/hw/kvm/clock.c
@@ -65,9 +65,25 @@  static void kvmclock_vm_state_change(void *opaque, int running,
                                      RunState state)
 {
     KVMClockState *s = opaque;
+    CPUArchState *penv = first_cpu;
+    int cap_clock_ctrl = kvm_check_extension(kvm_state, KVM_CAP_KVMCLOCK_CTRL);
+    int ret;
 
     if (running) {
         s->clock_valid = false;
+
+        if (!cap_clock_ctrl) {
+            return;
+        }
+        for (penv = first_cpu; penv != NULL; penv = penv->next_cpu) {
+            ret = kvm_vcpu_ioctl(penv, KVM_KVMCLOCK_CTRL, 0);
+            if (ret) {
+                if (ret != -EINVAL) {
+                    fprintf(stderr, "%s: %s\n", __func__, strerror(-ret));
+                }
+                return;
+            }
+        }
     }
 }