linux-kernel - [PATCH v6 1/3] KVM: x86: clean up reexecute

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Message-ID: <50F2D64C.4030804@linux.vnet.ibm.com>
Date:	Sun, 13 Jan 2013 23:44:12 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Gleb Natapov <gleb@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: [PATCH v6 1/3] KVM: x86: clean up reexecute_instruction

Little cleanup for reexecute_instruction, also use gpa_to_gfn in
retry_instruction

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 arch/x86/kvm/x86.c |   13 ++++++-------
 1 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1c9c834..08cacd9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4761,19 +4761,18 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva)
 	if (tdp_enabled)
 		return false;

+	gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL);
+	if (gpa == UNMAPPED_GVA)
+		return true; /* let cpu generate fault */
+
 	/*
 	 * if emulation was due to access to shadowed page table
 	 * and it failed try to unshadow page and re-enter the
 	 * guest to let CPU execute the instruction.
 	 */
-	if (kvm_mmu_unprotect_page_virt(vcpu, gva))
+	if (kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)))
 		return true;

-	gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL);
-
-	if (gpa == UNMAPPED_GVA)
-		return true; /* let cpu generate fault */
-
 	/*
 	 * Do not retry the unhandleable instruction if it faults on the
 	 * readonly host memory, otherwise it will goto a infinite loop:
@@ -4828,7 +4827,7 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
 	if (!vcpu->arch.mmu.direct_map)
 		gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);

-	kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
+	kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));

 	return true;
 }
-- 
1.7.7.6

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