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authorLiang Li <liang.z.li@intel.com>2015-12-08 09:14:07 +0800
committerLiang Li <liang.z.li@intel.com>2015-12-08 09:16:17 +0800
commitb52baab237a0b45cb18b26f529e6490b42574209 (patch)
treee8bd69d1ccf45f46381617d27cfdd1966abde0b1 /qemu/hw/i386/kvm
parentcc62f651747d5844cc12d33fb3620a7d05bae7dc (diff)
kvmclock: add a new function to update env->tsc.WW-2015-52
(Back port from upstream, commit id: 0fd7e098db30e302d27920487f0afec) The commit 317b0a6d8 fixed an issue which caused by the outdated env->tsc value, but the fix lead to 'cpu_synchronize_all_states()' called twice during live migration. The 'cpu_synchronize_all_states()' takes about 130us for a VM which has 4 vcpus, it's a bit expensive. Synchronize the whole CPU context just for updating env->tsc is too wasting, this patch use a new function to update the env->tsc. Comparing to 'cpu_synchronize_all_states()', it only takes about 20us. Change-Id: I7dc8371aa17b005d073249c3732d9a7424f20a25 Signed-off-by: Liang Li <liang.z.li@intel.com> Message-Id: <1446695464-27116-2-git-send-email-liang.z.li@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'qemu/hw/i386/kvm')
-rw-r--r--qemu/hw/i386/kvm/clock.c18
1 files changed, 2 insertions, 16 deletions
diff --git a/qemu/hw/i386/kvm/clock.c b/qemu/hw/i386/kvm/clock.c
index efdf16584..0593a3f1f 100644
--- a/qemu/hw/i386/kvm/clock.c
+++ b/qemu/hw/i386/kvm/clock.c
@@ -17,7 +17,7 @@
#include "qemu/host-utils.h"
#include "sysemu/sysemu.h"
#include "sysemu/kvm.h"
-#include "sysemu/cpus.h"
+#include "kvm_i386.h"
#include "hw/sysbus.h"
#include "hw/kvm/clock.h"
@@ -125,21 +125,7 @@ static void kvmclock_vm_state_change(void *opaque, int running,
return;
}
- cpu_synchronize_all_states();
- /* In theory, the cpu_synchronize_all_states() call above wouldn't
- * affect the rest of the code, as the VCPU state inside CPUState
- * is supposed to always match the VCPU state on the kernel side.
- *
- * In practice, calling cpu_synchronize_state() too soon will load the
- * kernel-side APIC state into X86CPU.apic_state too early, APIC state
- * won't be reloaded later because CPUState.vcpu_dirty==true, and
- * outdated APIC state may be migrated to another host.
- *
- * The real fix would be to make sure outdated APIC state is read
- * from the kernel again when necessary. While this is not fixed, we
- * need the cpu_clean_all_dirty() call below.
- */
- cpu_clean_all_dirty();
+ kvm_synchronize_all_tsc();
ret = kvm_vm_ioctl(kvm_state, KVM_GET_CLOCK, &data);
if (ret < 0) {