Commit 4b648665 authored Jul 20, 2012 by Bruce Rogers Committed by Marcelo Tosatti Aug 01, 2012

KVM: x86: apply kvmclock offset to guest wall clock time



When a guest migrates to a new host, the system time difference from the
previous host is used in the updates to the kvmclock system time visible
to the guest, resulting in a continuation of correct kvmclock based guest
timekeeping.

The wall clock component of the kvmclock provided time is currently not
updated with this same time offset. Since the Linux guest caches the
wall clock based time, this discrepency is not noticed until the guest is
rebooted. After reboot the guest's time calculations are off.

This patch adjusts the wall clock by the kvmclock_offset, resulting in
correct guest time after a reboot.

Cc: Zachary Amsden <zamsden@gmail.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

parent aea218f3

arch/x86/kvm/x86.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -925,6 +925,10 @@ static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
		*/
		getboottime(&boot);

		if (kvm->arch.kvmclock_offset) {
		struct timespec ts = ns_to_timespec(kvm->arch.kvmclock_offset);
		boot = timespec_sub(boot, ts);
		}
		wc.sec = boot.tv_sec;
		wc.nsec = boot.tv_nsec;
		wc.version = version;

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