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Merge remote-tracking branch 'remotes/kvm/uq/master' into staging

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* remotes/kvm/uq/master:
  kvm: Fix eax for cpuid leaf 0x40000000
  kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation
  kvm: Enable -cpu option to hide KVM
  kvm: Ensure negative return value on kvm_init() error handling path
  target-i386: set CC_OP to CC_OP_EFLAGS in cpu_load_eflags
  target-i386: get CPL from SS.DPL
  target-i386: rework CPL checks during task switch, preparing for next patch
  target-i386: fix segment flags for SMM and VM86 mode
  target-i386: Fix vm86 mode regression introduced in fd460606fd.
  kvm_stat: allow choosing between tracepoints and old stats
  kvmclock: Ensure time in migration never goes backward

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2014-06-05 19:16:28 +01:00
commit 9f0355b590
14 changed files with 175 additions and 77 deletions
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52
hw/i386/kvm/clock.c
View file

@ -14,8 +14,10 @@
*/
#include "qemu-common.h"
#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"
@ -34,6 +36,48 @@ 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));
assert(time.tsc_timestamp <= migration_tsc);
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)
@ -45,9 +89,15 @@ 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);
@ -75,6 +125,8 @@ 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));