Use LSB of the address passed through the msr to enable/disable
the clock. Setting it to 1 enables it, setting it to 0 disables it.
As the guest data structures are aligned anyway, this
won't be a problem, as this bit is free.
Guest is changed accordingly
Signed-off-by: Glauber Costa <[EMAIL PROTECTED]>
---
arch/x86/kernel/kvmclock.c | 2 +-
arch/x86/kvm/x86.c | 9 ++++++++-
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 7c481a3..f654a12 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -125,7 +125,7 @@ static int kvm_register_clock(void)
{
int cpu = smp_processor_id();
int low, high;
- low = (int)__pa(&per_cpu(hv_clock, cpu));
+ low = (int)__pa(&per_cpu(hv_clock, cpu)) | 1;
high = ((u64)__pa(&per_cpu(hv_clock, cpu)) >> 32);
return native_write_msr_safe(MSR_KVM_SYSTEM_TIME, low, high);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6abd784..64beff6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -591,8 +591,15 @@ int kvm_set_msr_common(struct kvm_vcpu *
if (vcpu->arch.time_page)
kvm_release_page_dirty(vcpu->arch.time_page);
+ /* we verify if the enable bit is set... */
+ if (!(data & 1)) {
+ vcpu->arch.time = NULL;
+ break;
+ }
+
vcpu->arch.time = data & PAGE_MASK;
- vcpu->arch.time_offset = data & ~PAGE_MASK;
+ /* ...but clean it before doing the actual write */
+ vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
vcpu->arch.hv_clock.tsc_to_system_mul =
clocksource_khz2mult(tsc_khz, 22);
--
1.4.2
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