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Revert "kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation" 

This reverts commit 9b1786829a.

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>
This commit is contained in:
Paolo Bonzini 2014-07-15 21:45:42 +02:00
parent bb2eb1892d
commit 108e4c3871
1 changed files with 0 additions and 4 deletions
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4
hw/i386/kvm/clock.c
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@ -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));