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From da4fe791cecafbec05395041c52cb545308b1b61 Mon Sep 17 00:00:00 2001
From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Thu, 26 Jun 2014 15:06:15 +0200
Subject: [PATCH 13/13] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Marcelo Tosatti <mtosatti@redhat.com>
Message-id: <20140626150716.639538444@amt.cnet>
Patchwork-id: 59386
O-Subject: [RHEL-7.1 qemu-kvm PATCH 2/2] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation
Bugzilla: 1098602
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
RH-Acked-by: Andrew Jones <drjones@redhat.com>
commit 9b1786829aefb83f37a8f3135e3ea91c56001b56 upstream
Ensure proper env->tsc value for kvmclock_current_nsec calculation.
Reported-by: Marcin GibuĊ‚a <m.gibula@beyond.pl>
Cc: qemu-stable@nongnu.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
BZ: 1098602
---
hw/i386/kvm/clock.c | 4 ++++
1 file changed, 4 insertions(+)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
hw/i386/kvm/clock.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/hw/i386/kvm/clock.c b/hw/i386/kvm/clock.c
index 1f2a26e..d52c2ea 100644
--- a/hw/i386/kvm/clock.c
+++ b/hw/i386/kvm/clock.c
@@ -17,6 +17,7 @@
#include "qemu/host-utils.h"
#include "sysemu/sysemu.h"
#include "sysemu/kvm.h"
+#include "sysemu/cpus.h"
#include "hw/sysbus.h"
#include "hw/kvm/clock.h"
@@ -60,6 +61,7 @@ static uint64_t kvmclock_current_nsec(KVMClockState *s)
cpu_physical_memory_read(kvmclock_struct_pa, &time, sizeof(time));
+ assert(time.tsc_timestamp <= migration_tsc);
delta = migration_tsc - time.tsc_timestamp;
if (time.tsc_shift < 0) {
delta >>= -time.tsc_shift;
@@ -118,6 +120,8 @@ static void kvmclock_vm_state_change(void *opaque, int running,
if (s->clock_valid) {
return;
}
+
+ cpu_synchronize_all_states();
ret = kvm_vm_ioctl(kvm_state, KVM_GET_CLOCK, &data);
if (ret < 0) {
fprintf(stderr, "KVM_GET_CLOCK failed: %s\n", strerror(ret));
--
1.7.1