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authorGerd Hoffmann <kraxel@redhat.com>2009-02-04 19:52:04 +0300
committerAvi Kivity <avi@redhat.com>2009-03-24 12:03:09 +0300
commitc807660407a695f390034e402edfe544a1d2e40c (patch)
treef362e26ed5aee6458a0f84aa60f52dfb4ea6437e /include/linux/kvm_host.h
parent49cd7d2238e44f7ee4269481cd8a1261cc8f93a5 (diff)
downloadlinux-c807660407a695f390034e402edfe544a1d2e40c.tar.xz
KVM: Fix kvmclock on !constant_tsc boxes
kvmclock currently falls apart on machines without constant tsc. This patch fixes it. Changes: * keep tsc frequency in a per-cpu variable. * handle kvmclock update using a new request flag, thus checking whenever we need an update each time we enter guest context. * use a cpufreq notifier to track frequency changes and force kvmclock updates. * send ipis to kick cpu out of guest context if needed to make sure the guest doesn't see stale values. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'include/linux/kvm_host.h')
-rw-r--r--include/linux/kvm_host.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 339eda3ca6ee..18b4df8264cf 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -37,6 +37,7 @@
#define KVM_REQ_PENDING_TIMER 5
#define KVM_REQ_UNHALT 6
#define KVM_REQ_MMU_SYNC 7
+#define KVM_REQ_KVMCLOCK_UPDATE 8
#define KVM_USERSPACE_IRQ_SOURCE_ID 0