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KVM: x86: zero kvmclock_offset when vcpu0 initializes kvmclock system MSR

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Initialize kvmclock base, on kvmclock system MSR write time,
so that the guest sees kvmclock counting from zero.

This matches baremetal behaviour when kvmclock in guest
sets sched clock stable.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
[Remove unnecessary comment. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marcelo Tosatti 2015-05-28 20:20:41 -03:00 committed by Paolo Bonzini
parent 0ad83caa21
commit b7e60c5aed
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/x86.c
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@ -1700,6 +1700,8 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
vcpu->pvclock_set_guest_stopped_request = false;
}
pvclock_flags |= PVCLOCK_COUNTS_FROM_ZERO;
/* If the host uses TSC clocksource, then it is stable */
if (use_master_clock)
pvclock_flags |= PVCLOCK_TSC_STABLE_BIT;
@ -2282,6 +2284,8 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
&vcpu->requests);
ka->boot_vcpu_runs_old_kvmclock = tmp;
ka->kvmclock_offset = -get_kernel_ns();
}
vcpu->arch.time = data;