diff mbox

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

Message ID 20150522004008.GA5242@amt.cnet (mailing list archive)
State New, archived
Headers show

Commit Message

Marcelo Tosatti May 22, 2015, 12:40 a.m. UTC
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>

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diff mbox

Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cc2c759..ea40d24 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2188,6 +2188,8 @@  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;