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authorGleb Natapov <gleb@redhat.com>2010-10-14 11:22:55 +0200
committerAvi Kivity <avi@redhat.com>2011-01-12 11:23:21 +0200
commit6adba527420651b6cacaf392541c09fb108711a2 (patch)
tree1f81e4fc0bdf46b39ed62587a493f085633e8ac1 /arch/x86/kernel
parent6c047cd982f944fa63b2d96de2a06463d113f9fa (diff)
downloadop-kernel-dev-6adba527420651b6cacaf392541c09fb108711a2.zip
op-kernel-dev-6adba527420651b6cacaf392541c09fb108711a2.tar.gz
KVM: Let host know whether the guest can handle async PF in non-userspace context.
If guest can detect that it runs in non-preemptable context it can handle async PFs at any time, so let host know that it can send async PF even if guest cpu is not in userspace. Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r--arch/x86/kernel/kvm.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 47ea93e..91b3d65 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -449,6 +449,9 @@ void __cpuinit kvm_guest_cpu_init(void)
if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF) && kvmapf) {
u64 pa = __pa(&__get_cpu_var(apf_reason));
+#ifdef CONFIG_PREEMPT
+ pa |= KVM_ASYNC_PF_SEND_ALWAYS;
+#endif
wrmsrl(MSR_KVM_ASYNC_PF_EN, pa | KVM_ASYNC_PF_ENABLED);
__get_cpu_var(apf_reason).enabled = 1;
printk(KERN_INFO"KVM setup async PF for cpu %d\n",
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