linux-kernel - [PATCH v7 12/12] Send async PF when guest is not in userspace too.

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Date:	Thu, 14 Oct 2010 11:17:10 +0200
From:	y@...hat.com
To:	kvm@...r.kernel.org
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org, avi@...hat.com,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	hpa@...or.com, riel@...hat.com, cl@...ux-foundation.org,
	mtosatti@...hat.com
Subject: [PATCH v7 12/12] Send async PF when guest is not in userspace too.

From: Gleb Natapov <gleb@...hat.com>

If guest indicates that it can handle async pf in kernel mode too send
it, but only if interrupts are enabled.

Acked-by: Rik van Riel <riel@...hat.com>
Signed-off-by: Gleb Natapov <gleb@...hat.com>
---
 arch/x86/kvm/x86.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1e442df..51cff2f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6248,7 +6248,8 @@ void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
 	kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
 
 	if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
-	    kvm_x86_ops->get_cpl(vcpu) == 0)
+	    (vcpu->arch.apf.send_user_only &&
+	     kvm_x86_ops->get_cpl(vcpu) == 0))
 		kvm_make_request(KVM_REQ_APF_HALT, vcpu);
 	else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
 		vcpu->arch.fault.error_code = 0;
-- 
1.7.1

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