[1/2] KVM: MMU: don't make direct sp read-only if !map_writable

Commit Message

Xiao Guangrong Dec. 13, 2010, 10:31 a.m. UTC

None

Patch

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 1a953ac..0c5cad0 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1987,6 +1987,8 @@  static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 
 	if (host_writable)
 		spte |= SPTE_HOST_WRITEABLE;
+	else
+		pte_access &= ~ACC_WRITE_MASK;
 
 	spte |= (u64)pfn << PAGE_SHIFT;
 
@@ -2226,8 +2228,6 @@  static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
 		if (iterator.level == level) {
 			unsigned pte_access = ACC_ALL;
 
-			if (!map_writable)
-				pte_access &= ~ACC_WRITE_MASK;
 			mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, pte_access,
 				     0, write, 1, &pt_write,
 				     level, gfn, pfn, prefault, map_writable);
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 146b681..6ed2c5e 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -593,9 +593,6 @@  static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
 	if (is_error_pfn(pfn))
 		return kvm_handle_bad_page(vcpu->kvm, walker.gfn, pfn);
 
-	if (!map_writable)
-		walker.pte_access &= ~ACC_WRITE_MASK;
-
 	spin_lock(&vcpu->kvm->mmu_lock);
 	if (mmu_notifier_retry(vcpu, mmu_seq))
 		goto out_unlock;
@@ -809,12 +806,8 @@  static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
 
 		nr_present++;
 		pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
-		if (!(sp->spt[i] & SPTE_HOST_WRITEABLE)) {
-			pte_access &= ~ACC_WRITE_MASK;
-			host_writable = 0;
-		} else {
-			host_writable = 1;
-		}
+		host_writable = !!(sp->spt[i] & SPTE_HOST_WRITEABLE);
+
 		set_spte(vcpu, &sp->spt[i], pte_access, 0, 0,
 			 is_dirty_gpte(gpte), PT_PAGE_TABLE_LEVEL, gfn,
 			 spte_to_pfn(sp->spt[i]), true, false,