linux-kernel - [PATCH 8/9] KVM: x86: pass kvm_mmu_page to gfn_to

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Date:	Tue, 19 May 2015 19:25:12 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp>,
	Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
	rkrcmar@...hat.com
Subject: [PATCH 8/9] KVM: x86: pass kvm_mmu_page to gfn_to_rmap

This is always available, and later we could also use the role to look
up the right memslots array.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu.c       | 10 +++++-----
 arch/x86/kvm/mmu_audit.c |  7 ++++---
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 6a7e5b6246b1..ceed1c591bc5 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1039,12 +1039,12 @@ static unsigned long *__gfn_to_rmap(gfn_t gfn, int level,
 /*
  * Take gfn and return the reverse mapping to it.
  */
-static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level)
+static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, struct kvm_mmu_page *sp)
 {
 	struct kvm_memory_slot *slot;
 
 	slot = gfn_to_memslot(kvm, gfn);
-	return __gfn_to_rmap(gfn, level, slot);
+	return __gfn_to_rmap(gfn, sp->role.level, slot);
 }
 
 static bool rmap_can_add(struct kvm_vcpu *vcpu)
@@ -1062,7 +1062,7 @@ static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
 
 	sp = page_header(__pa(spte));
 	kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn);
-	rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
+	rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp);
 	return pte_list_add(vcpu, spte, rmapp);
 }
 
@@ -1074,7 +1074,7 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
 
 	sp = page_header(__pa(spte));
 	gfn = kvm_mmu_page_get_gfn(sp, spte - sp->spt);
-	rmapp = gfn_to_rmap(kvm, gfn, sp->role.level);
+	rmapp = gfn_to_rmap(kvm, gfn, sp);
 	pte_list_remove(spte, rmapp);
 }
 
@@ -1608,7 +1608,7 @@ static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
 
 	sp = page_header(__pa(spte));
 
-	rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
+	rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp);
 
 	kvm_unmap_rmapp(vcpu->kvm, rmapp, NULL, gfn, sp->role.level, 0);
 	kvm_flush_remote_tlbs(vcpu->kvm);
diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c
index 368d53497314..020d7faf9f46 100644
--- a/arch/x86/kvm/mmu_audit.c
+++ b/arch/x86/kvm/mmu_audit.c
@@ -146,7 +146,7 @@ static void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep)
 		return;
 	}
 
-	rmapp = gfn_to_rmap(kvm, gfn, rev_sp->role.level);
+	rmapp = gfn_to_rmap(kvm, gfn, rev_sp);
 	if (!*rmapp) {
 		if (!__ratelimit(&ratelimit_state))
 			return;
@@ -192,10 +192,11 @@ static void audit_write_protection(struct kvm *kvm, struct kvm_mmu_page *sp)
 	u64 *sptep;
 	struct rmap_iterator iter;
 
-	if (sp->role.direct || sp->unsync || sp->role.invalid)
+	if (sp->role.direct || sp->unsync || sp->role.invalid ||
+	    sp->role.level != PT_PAGE_TABLE_LEVEL)
 		return;
 
-	rmapp = gfn_to_rmap(kvm, sp->gfn, PT_PAGE_TABLE_LEVEL);
+	rmapp = gfn_to_rmap(kvm, sp->gfn, sp);
 
 	for_each_rmap_spte(rmapp, &iter, sptep)
 		if (is_writable_pte(*sptep))
-- 
1.8.3.1


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