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KVM: Let host know whether the guest can handle async PF in non-userspace context.

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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>
This commit is contained in:
Gleb Natapov
2010-10-14 11:22:55 +02:00
committed by Avi Kivity
parent 6c047cd982
commit 6adba52742
5 changed files with 11 additions and 4 deletions
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5
arch/x86/kvm/x86.c
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@ -1429,8 +1429,8 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
{
gpa_t gpa = data & ~0x3f;
/* Bits 1:5 are resrved, Should be zero */
if (data & 0x3e)
/* Bits 2:5 are resrved, Should be zero */
if (data & 0x3c)
return 1;
vcpu->arch.apf.msr_val = data;
@ -1444,6 +1444,7 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa))
return 1;
vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
kvm_async_pf_wakeup_all(vcpu);
return 0;
}