[PATCH] KVM: select HIGH_RES_TIMERS when KVM enabled

[Liu , Jinsong]

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 <jinsong.liu@xxxxxxxxx>
---
 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
--=20
1.7.1

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Content-Type: application/octet-stream;
	name="0001-KVM-select-HIGH_RES_TIMERS-when-KVM-enabled.patch"
Content-Description: 0001-KVM-select-HIGH_RES_TIMERS-when-KVM-enabled.patch
Content-Disposition: attachment;
	filename="0001-KVM-select-HIGH_RES_TIMERS-when-KVM-enabled.patch"; size=1488;
	creation-date="Fri, 07 Sep 2012 11:58:20 GMT";
	modification-date="Fri, 07 Sep 2012 19:50:06 GMT"
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