Revert "kvmclock: Ensure time in migration never goes backward"
This reverts commita096b3a673
. This patch caused a hang that was fixed by commit9b17868
(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>
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@ -14,7 +14,6 @@
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*/
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#include "qemu-common.h"
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#include "qemu/host-utils.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/kvm.h"
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#include "hw/sysbus.h"
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@ -35,47 +34,6 @@ typedef struct KVMClockState {
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bool clock_valid;
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} KVMClockState;
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struct pvclock_vcpu_time_info {
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uint32_t version;
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uint32_t pad0;
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uint64_t tsc_timestamp;
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uint64_t system_time;
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uint32_t tsc_to_system_mul;
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int8_t tsc_shift;
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uint8_t flags;
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uint8_t pad[2];
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} __attribute__((__packed__)); /* 32 bytes */
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static uint64_t kvmclock_current_nsec(KVMClockState *s)
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{
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CPUState *cpu = first_cpu;
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CPUX86State *env = cpu->env_ptr;
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hwaddr kvmclock_struct_pa = env->system_time_msr & ~1ULL;
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uint64_t migration_tsc = env->tsc;
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struct pvclock_vcpu_time_info time;
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uint64_t delta;
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uint64_t nsec_lo;
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uint64_t nsec_hi;
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uint64_t nsec;
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if (!(env->system_time_msr & 1ULL)) {
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/* KVM clock not active */
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return 0;
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}
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cpu_physical_memory_read(kvmclock_struct_pa, &time, sizeof(time));
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delta = migration_tsc - time.tsc_timestamp;
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if (time.tsc_shift < 0) {
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delta >>= -time.tsc_shift;
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} else {
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delta <<= time.tsc_shift;
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}
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mulu64(&nsec_lo, &nsec_hi, delta, time.tsc_to_system_mul);
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nsec = (nsec_lo >> 32) | (nsec_hi << 32);
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return nsec + time.system_time;
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}
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static void kvmclock_vm_state_change(void *opaque, int running,
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RunState state)
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@ -87,15 +45,9 @@ static void kvmclock_vm_state_change(void *opaque, int running,
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if (running) {
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struct kvm_clock_data data;
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uint64_t time_at_migration = kvmclock_current_nsec(s);
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s->clock_valid = false;
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/* We can't rely on the migrated clock value, just discard it */
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if (time_at_migration) {
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s->clock = time_at_migration;
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}
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data.clock = s->clock;
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data.flags = 0;
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ret = kvm_vm_ioctl(kvm_state, KVM_SET_CLOCK, &data);
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