From mboxrd@z Thu Jan 1 00:00:00 1970 From: Huaitong Han Subject: [PATCH] kvmclock: fix wall clock msr write error Date: Tue, 10 Jan 2017 18:25:00 +0800 Message-ID: <1484043900-28111-1-git-send-email-huaitong.han@intel.com> Cc: kvm@vger.kernel.org, Huaitong Han To: pbonzini@redhat.com Return-path: Received: from mga06.intel.com ([134.134.136.31]:25147 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750924AbdAJKZK (ORCPT ); Tue, 10 Jan 2017 05:25:10 -0500 Sender: kvm-owner@vger.kernel.org List-ID: kvmclock_offset is negative, it should be timespec64_add intead of timespec64_sub. kvm->arch.kvmclock_offset = -ktime_get_boot_ns() Signed-off-by: Huaitong Han --- arch/x86/kvm/x86.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 2f22810..7668a0e 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1208,7 +1208,7 @@ static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) if (kvm->arch.kvmclock_offset) { struct timespec64 ts = ns_to_timespec64(kvm->arch.kvmclock_offset); - boot = timespec64_sub(boot, ts); + boot = timespec64_add(boot, ts); } wc.sec = (u32)boot.tv_sec; /* overflow in 2106 guest time */ wc.nsec = boot.tv_nsec; -- 1.8.3.1