[191/200] KVM: MMU: Segregate shadow pages with different cr0.wp
diff mbox series

Message ID 20100701174302.650257645@clark.site
State New, archived
Headers show
  • stable review
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Commit Message

Greg KH July 1, 2010, 5:44 p.m. UTC
2.6.34-stable review patch.  If anyone has any objections, please let me know.


From: Avi Kivity <avi@redhat.com>

When cr0.wp=0, we may shadow a gpte having u/s=1 and r/w=0 with an spte
having u/s=0 and r/w=1.  This allows excessive access if the guest sets
cr0.wp=1 and accesses through this spte.

Fix by making cr0.wp part of the base role; we'll have different sptes for
the two cases and the problem disappears.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

(Cherry-picked from commit 3dbe141595faa48a067add3e47bba3205b79d33c)
 arch/x86/include/asm/kvm_host.h |    1 +
 arch/x86/kvm/mmu.c              |    3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

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diff mbox series

--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -180,6 +180,7 @@  union kvm_mmu_page_role {
 		unsigned invalid:1;
 		unsigned cr4_pge:1;
 		unsigned nxe:1;
+		unsigned cr0_wp:1;
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -223,7 +223,7 @@  void kvm_mmu_set_mask_ptes(u64 user_mask
-static int is_write_protection(struct kvm_vcpu *vcpu)
+static bool is_write_protection(struct kvm_vcpu *vcpu)
 	return kvm_read_cr0_bits(vcpu, X86_CR0_WP);
@@ -2439,6 +2439,7 @@  static int init_kvm_softmmu(struct kvm_v
 		r = paging32_init_context(vcpu);
 	vcpu->arch.mmu.base_role.glevels = vcpu->arch.mmu.root_level;
+	vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu);
 	return r;