linux-kernel - [PATCH 04/13] KVM: MMU: introduce FNAME(get_sp

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Date:	Thu, 29 Mar 2012 17:22:47 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: [PATCH 04/13] KVM: MMU: introduce FNAME(get_sp_gpa)

It can calculate the base gpa of the specified shadow page on any level,
let it instead of FNAME(get_level1_sp_gpa)

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 arch/x86/kvm/paging_tmpl.h |   26 ++++++++++++--------------
 1 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index b9fd1c4..f0fbde3 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -558,6 +558,16 @@ out_gpte_changed:
 	return NULL;
 }

+static gpa_t FNAME(get_sp_gpa)(struct kvm_mmu_page *sp)
+{
+	int offset, shift;
+
+	shift = PAGE_SHIFT - (PT_LEVEL_BITS - PT64_LEVEL_BITS) * sp->role.level;
+	offset = sp->role.quadrant << shift;
+
+	return gfn_to_gpa(sp->gfn) + offset;
+}
+
 /*
  * Page fault handler.  There are several causes for a page fault:
  *   - there is no shadow pte for the guest pte
@@ -659,18 +669,6 @@ out_unlock:
 	return 0;
 }

-static gpa_t FNAME(get_level1_sp_gpa)(struct kvm_mmu_page *sp)
-{
-	int offset = 0;
-
-	WARN_ON(sp->role.level != 1);
-
-	if (PTTYPE == 32)
-		offset = sp->role.quadrant << PT64_LEVEL_BITS;
-
-	return gfn_to_gpa(sp->gfn) + offset * sizeof(pt_element_t);
-}
-
 static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
 {
 	struct kvm_shadow_walk_iterator iterator;
@@ -699,7 +697,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
 			if (!sp->unsync)
 				break;

-			pte_gpa = FNAME(get_level1_sp_gpa)(sp);
+			pte_gpa = FNAME(get_sp_gpa)(sp);
 			pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t);

 			if (mmu_page_zap_pte(vcpu->kvm, sp, sptep))
@@ -780,7 +778,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
 	/* direct kvm_mmu_page can not be unsync. */
 	BUG_ON(sp->role.direct);

-	first_pte_gpa = FNAME(get_level1_sp_gpa)(sp);
+	first_pte_gpa = FNAME(get_sp_gpa)(sp);

 	for (i = 0; i < PT64_ENT_PER_PAGE; i++) {
 		unsigned pte_access;
-- 
1.7.7.6

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