linux-kernel - [PATCH 11/12] kvm/svm: handle #pf intercepts in nested_svm_exit

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Date:	Wed, 29 Jul 2009 14:56:31 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 11/12] kvm/svm: handle #pf intercepts in nested_svm_exit_handled directly

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kvm/svm.c |   26 ++++++++++++++++++++++++--
 1 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1a44e43..381ed38 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1498,6 +1498,9 @@ static int nested_svm_exit_handled_msr(struct vcpu_svm *svm,
 	return 0;
 }
 
+/*
+ * If this function returns true, this #vmexit was already handled
+ */
 static int nested_svm_exit_handled(struct vcpu_svm *svm, bool kvm_override)
 {
 	u32 exit_code = svm->vmcb->control.exit_code;
@@ -1515,8 +1518,27 @@ static int nested_svm_exit_handled(struct vcpu_svm *svm, bool kvm_override)
 			break;
 		/* When we're shadowing, trap PFs */
 		case SVM_EXIT_EXCP_BASE + PF_VECTOR:
-			if (!npt_enabled)
-				return 0;
+			if (!npt_enabled) {
+				u64 fault_address;
+				u32 error_code;
+
+				fault_address  = svm->vmcb->control.exit_info_2;
+				error_code     = svm->vmcb->control.exit_info_1;
+
+				kvm_mmu_page_fault(&svm->vcpu,
+						   fault_address,
+						   error_code);
+
+				/*
+				 * If we are still nested here the pending
+				 * irqs/exceptions must be reinjected
+				 */
+				//if (is_nested(svm))
+				//	svm_complete_interrupts(svm);
+
+				return true;
+			}
+
 			break;
 		default:
 			break;
-- 
1.6.3.3


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