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[Qemu-devel] [PULL 5/6] Revert "kvmclock: Ensure proper env->tsc value f


From: Paolo Bonzini
Subject: [Qemu-devel] [PULL 5/6] Revert "kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation"
Date: Fri, 18 Jul 2014 15:31:41 +0200

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: address@hidden
Cc: address@hidden
Cc: address@hidden
Signed-off-by: Paolo Bonzini <address@hidden>
---
 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 272a88a..feb5fc5 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));
-- 
1.9.3





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