On 07/19/2010 06:31 PM, Gleb Natapov wrote:
If guest indicates that it can handle async pf in kernel mode too send it, but only if interrupt are enabled. Reviewed-by: Rik van Riel<riel@xxxxxxxxxx> Signed-off-by: Gleb Natapov<gleb@xxxxxxxxxx> --- arch/x86/kvm/mmu.c | 8 +++++++- 1 files changed, 7 insertions(+), 1 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 12d1a7b..ed87b1c 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2361,7 +2361,13 @@ static bool can_do_async_pf(struct kvm_vcpu *vcpu) if (!vcpu->arch.apf_data || kvm_event_needs_reinjection(vcpu)) return false; - return !!kvm_x86_ops->get_cpl(vcpu); + if (vcpu->arch.apf_send_user_only) + return !!kvm_x86_ops->get_cpl(vcpu);
cpl is not a bool. Compare it with 0.
+ + if (!kvm_x86_ops->interrupt_allowed(vcpu)) + return false; + + return true; }
Should have commented before, but get_cpl() is not accurate when doing nested virtualization. When L1 intercepts page faults, being in L2 is equivalent to CPL 3. But we need to get the apf information to L1 somehow.
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