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Revert "kvmclock: Ensure time in migration never goes backward" 

This reverts commit a096b3a673.

This patch caused a hang that was fixed by commit 9b17868 (kvmclock:
Ensure proper env->tsc value for kvmclock_current_nsec calculation,
2014-06-03), and we just had to revert that commit.  Drop this one
too.

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 21:46:02 +02:00
parent 108e4c3871
commit fa666c10f2
1 changed files with 0 additions and 48 deletions
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48
hw/i386/kvm/clock.c
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@ -14,7 +14,6 @@
*/
#include "qemu-common.h"
#include "qemu/host-utils.h"
#include "sysemu/sysemu.h"
#include "sysemu/kvm.h"
#include "hw/sysbus.h"
@ -35,47 +34,6 @@ typedef struct KVMClockState {
bool clock_valid;
} KVMClockState;
struct pvclock_vcpu_time_info {
uint32_t version;
uint32_t pad0;
uint64_t tsc_timestamp;
uint64_t system_time;
uint32_t tsc_to_system_mul;
int8_t tsc_shift;
uint8_t flags;
uint8_t pad[2];
} __attribute__((__packed__)); /* 32 bytes */
static uint64_t kvmclock_current_nsec(KVMClockState *s)
{
CPUState *cpu = first_cpu;
CPUX86State *env = cpu->env_ptr;
hwaddr kvmclock_struct_pa = env->system_time_msr & ~1ULL;
uint64_t migration_tsc = env->tsc;
struct pvclock_vcpu_time_info time;
uint64_t delta;
uint64_t nsec_lo;
uint64_t nsec_hi;
uint64_t nsec;
if (!(env->system_time_msr & 1ULL)) {
/* KVM clock not active */
return 0;
}
cpu_physical_memory_read(kvmclock_struct_pa, &time, sizeof(time));
delta = migration_tsc - time.tsc_timestamp;
if (time.tsc_shift < 0) {
delta >>= -time.tsc_shift;
} else {
delta <<= time.tsc_shift;
}
mulu64(&nsec_lo, &nsec_hi, delta, time.tsc_to_system_mul);
nsec = (nsec_lo >> 32) | (nsec_hi << 32);
return nsec + time.system_time;
}
static void kvmclock_vm_state_change(void *opaque, int running,
RunState state)
@ -87,15 +45,9 @@ static void kvmclock_vm_state_change(void *opaque, int running,
if (running) {
struct kvm_clock_data data;
uint64_t time_at_migration = kvmclock_current_nsec(s);
s->clock_valid = false;
/* We can't rely on the migrated clock value, just discard it */
if (time_at_migration) {
s->clock = time_at_migration;
}
data.clock = s->clock;
data.flags = 0;
ret = kvm_vm_ioctl(kvm_state, KVM_SET_CLOCK, &data);