linux-kernel - [PATCH 4/5] mmu: remove is_present

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 28 Jun 2016 00:32:39 -0400
From:	Bandan Das <bsd@...hat.com>
To:	kvm@...r.kernel.org
Cc:	pbonzini@...hat.com, guangrong.xiao@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] mmu: remove is_present_gpte()

We have two versions of the above function.
To prevent confusion and bugs in the future, remove
the non-FNAME version entirely and replace all calls
with the actual check.

Signed-off-by: Bandan Das <bsd@...hat.com>
---
 arch/x86/kvm/mmu.c         | 2 +-
 arch/x86/kvm/mmu.h         | 5 -----
 arch/x86/kvm/paging_tmpl.h | 2 +-
 arch/x86/kvm/x86.c         | 2 +-
 4 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index ee2fb16..7197e36 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3195,7 +3195,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 		MMU_WARN_ON(VALID_PAGE(root));
 		if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
 			pdptr = vcpu->arch.mmu.get_pdptr(vcpu, i);
-			if (!is_present_gpte(pdptr)) {
+			if (!(pdptr & PT_PRESENT_MASK)) {
 				vcpu->arch.mmu.pae_root[i] = 0;
 				continue;
 			}
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 66b33b9..ddc56e9 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -93,11 +93,6 @@ static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
 	return kvm_mmu_load(vcpu);
 }
 
-static inline int is_present_gpte(unsigned long pte)
-{
-	return pte & PT_PRESENT_MASK;
-}
-
 /*
  * Currently, we have two sorts of write-protection, a) the first one
  * write-protects guest page to sync the guest modification, b) another one is
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 896118e..1384cb7 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -131,7 +131,7 @@ static inline void FNAME(protect_clean_gpte)(unsigned *access, unsigned gpte)
 static inline int FNAME(is_present_gpte)(unsigned long pte)
 {
 #if PTTYPE != PTTYPE_EPT
-	return is_present_gpte(pte);
+	return pte & PT_PRESENT_MASK;
 #else
 	return pte & 7;
 #endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 902d9da..dc4fed7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -537,7 +537,7 @@ int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
 		goto out;
 	}
 	for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
-		if (is_present_gpte(pdpte[i]) &&
+		if ((pdpte[i] & PT_PRESENT_MASK) &&
 		    (pdpte[i] &
 		     vcpu->arch.mmu.guest_rsvd_check.rsvd_bits_mask[0][2])) {
 			ret = 0;
-- 
2.5.5