From 64d0458ec50a7d6917adf1e9735ba6e6ae6024ad Mon Sep 17 00:00:00 2001 From: Liu, Jinsong Date: Sat, 8 Sep 2012 03:32:31 +0800 Subject: [PATCH] KVM: select HIGH_RES_TIMERS when KVM enabled This is for 2 reasons: 1. it's pointless for kvm lapic timer and tsc deadline timer when kernel hrtimer not configured as high resolution, since that would be not accurate based on wheel; 2. kvm lapic timer and tsc deadline timer based on hrtimer, setting a leftmost node to rb tree and then do hrtimer reprogram. If hrtimer not configured as high resolution, hrtimer_enqueue_reprogram do nothing and then make kvm lapic timer and tsc deadline timer fail. Signed-off-by: Liu, Jinsong --- arch/x86/kvm/Kconfig | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index a28f338..5f861ca 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -24,6 +24,8 @@ config KVM depends on PCI # for TASKSTATS/TASK_DELAY_ACCT: depends on NET + # for HIGH_RES_TIMERS + depends on !ARCH_USES_GETTIMEOFFSET select PREEMPT_NOTIFIERS select MMU_NOTIFIER select ANON_INODES @@ -37,6 +39,8 @@ config KVM select TASK_DELAY_ACCT select PERF_EVENTS select HAVE_KVM_MSI + select GENERIC_CLOCKEVENTS + select HIGH_RES_TIMERS ---help--- Support hosting fully virtualized guest machines using hardware virtualization extensions. You will need a fairly recent -- 1.7.1