From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754481Ab1HCOZP (ORCPT ); Wed, 3 Aug 2011 10:25:15 -0400 Received: from mail-qw0-f46.google.com ([209.85.216.46]:53808 "EHLO mail-qw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753552Ab1HCOZI (ORCPT ); Wed, 3 Aug 2011 10:25:08 -0400 From: Eric B Munson To: kvm@vger.kernel.org Cc: kvm-ia64@vger.kernel.org, kvm-ppc@vger.kernel.org, avi@redhat.com, riel@redhat.com, glommer@redhat.com, linux-kernel@vger.kernel.org, aliguori@us.ibm.com, raharper@us.ibm.com, Eric B Munson Subject: [RFC PATCH 2/3] Add functions to check if the host has stopped the vm Date: Wed, 3 Aug 2011 10:25:00 -0400 Message-Id: <1312381501-27746-3-git-send-email-emunson@mgebm.net> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1312381501-27746-1-git-send-email-emunson@mgebm.net> References: <1312381501-27746-1-git-send-email-emunson@mgebm.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When a host stops or suspends a VM it will set a flag to show this. The watchdog will use these functions to determine if a softlockup is real, or the result of a suspended VM. Signed-off-by: Eric B Munson --- arch/x86/include/asm/pvclock.h | 3 +++ arch/x86/kernel/kvmclock.c | 12 ++++++++++++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index a518c0a..a9e9b4f 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -13,6 +13,9 @@ void pvclock_read_wallclock(struct pvclock_wall_clock *wall, struct timespec *ts); void pvclock_resume(void); +bool kvm_check_host_stopped(void); +void kvm_clear_host_stopped(void); + /* * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction, * yielding a 64-bit result. diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index c1a0188..5a42582 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -113,6 +113,18 @@ static void kvm_get_preset_lpj(void) preset_lpj = lpj; } +bool kvm_check_host_stopped() +{ + struct pvclock_vcpu_time_info *src = &per_cpu(hv_clock, 0); + return (src->flags & PVCLOCK_STOPPED) != 0; +} + +void kvm_clear_host_stopped() +{ + struct pvclock_vcpu_time_info *src = &per_cpu(hv_clock, 0); + src->flags = src->flags & (~PVCLOCK_STOPPED); +} + static struct clocksource kvm_clock = { .name = "kvm-clock", .read = kvm_clock_get_cycles, -- 1.7.4.1