From 108e4c3871e0d0cd185ccffef5e932961f92dd63 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 15 Jul 2014 21:45:42 +0200
Subject: [PATCH] Revert "kvmclock: Ensure proper env->tsc value for
kvmclock_current_nsec calculation"
This reverts commit 9b1786829aefb83f37a8f3135e3ea91c56001b56.
This patch fixed a hang introduced by commit a096b3a (kvmclock: Ensure
time in migration never goes backward, 2014-05-16), but it causes
a regression in migration whose cause is not quite clear.
Because of this, I'm choosing to revert both patches. This trades a
2.1 regression for a bug that's been there forever.
Cc: agraf@suse.de
Cc: mtosatti@redhat.com
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
hw/i386/kvm/clock.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/hw/i386/kvm/clock.c b/hw/i386/kvm/clock.c
index 272a88acb5..feb5fc5109 100644
--- a/hw/i386/kvm/clock.c
+++ b/hw/i386/kvm/clock.c
@@ -17,7 +17,6 @@
#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"
@@ -66,7 +65,6 @@ 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;
@@ -125,8 +123,6 @@ 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));