From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric B Munson Subject: [PATCH 2/4] Add functions to check if the host has stopped the vm Date: Mon, 29 Aug 2011 17:27:13 -0600 Message-ID: <1314660435-23293-3-git-send-email-emunson@mgebm.net> References: <1314660435-23293-1-git-send-email-emunson@mgebm.net> Return-path: Received: from e4.ny.us.ibm.com ([32.97.182.144]:43948 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755456Ab1H2X1n (ORCPT ); Mon, 29 Aug 2011 19:27:43 -0400 In-Reply-To: <1314660435-23293-1-git-send-email-emunson@mgebm.net> Sender: linux-arch-owner@vger.kernel.org List-ID: To: avi@redhat.com Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, arnd@arndb.de, mtosatti@redhat.com, riel@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, kvm-ppc@vger.kernel.org, aliguori@us.ibm.com, raharper@us.ibm.com, kvm-ia64@vger.kernel.org, Eric B Munson 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 | 2 ++ arch/x86/kernel/kvmclock.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index a518c0a..dd59ad0 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -13,6 +13,8 @@ void pvclock_read_wallclock(struct pvclock_wall_clock *wall, struct timespec *ts); void pvclock_resume(void); +bool kvm_check_and_clear_host_stopped(int cpu); + /* * 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..5f60d2b 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -113,6 +113,20 @@ static void kvm_get_preset_lpj(void) preset_lpj = lpj; } +bool kvm_check_and_clear_host_stopped(int cpu) +{ + bool ret = false; + struct pvclock_vcpu_time_info *src; + + src = &per_cpu(hv_clock, cpu); + if ((src->flags & PVCLOCK_GUEST_STOPPED) != 0) { + src->flags = src->flags & (~PVCLOCK_GUEST_STOPPED); + ret = true; + } + + return ret; +} + static struct clocksource kvm_clock = { .name = "kvm-clock", .read = kvm_clock_get_cycles, -- 1.7.4.1