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authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>2010-07-16 11:19:51 +0800
committerAvi Kivity <avi@redhat.com>2010-08-02 06:40:56 +0300
commitfa1de2bfc0feb7245328ad25fb3e6d5cd2c903b4 (patch)
treebc993022b24c60c2ea2452ca6d7f5ed0faf0a322 /arch/x86
parent6e3e243c3b6e0bbd18c6ce0fbc12bc3fe2d77b34 (diff)
KVM: MMU: add missing reserved bits check in speculative path
In the speculative path, we should check guest pte's reserved bits just as the real processor does Reported-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/mmu.c9
-rw-r--r--arch/x86/kvm/paging_tmpl.h5
2 files changed, 11 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 812770cddc8d..d2ea9cabc066 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2697,6 +2697,9 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
return;
}
+ if (is_rsvd_bits_set(vcpu, *(u64 *)new, PT_PAGE_TABLE_LEVEL))
+ return;
+
++vcpu->kvm->stat.mmu_pte_updated;
if (!sp->role.cr4_pae)
paging32_update_pte(vcpu, sp, spte, new);
@@ -2775,6 +2778,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
bool guest_initiated)
{
gfn_t gfn = gpa >> PAGE_SHIFT;
+ union kvm_mmu_page_role mask = { .word = 0 };
struct kvm_mmu_page *sp;
struct hlist_node *node;
LIST_HEAD(invalid_list);
@@ -2849,6 +2853,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
}
}
+ mask.cr0_wp = mask.cr4_pae = mask.nxe = 1;
for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn, node) {
pte_size = sp->role.cr4_pae ? 8 : 4;
misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1);
@@ -2896,7 +2901,9 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
while (npte--) {
entry = *spte;
mmu_pte_write_zap_pte(vcpu, sp, spte);
- if (gentry)
+ if (gentry &&
+ !((sp->role.word ^ vcpu->arch.mmu.base_role.word)
+ & mask.word))
mmu_pte_write_new_pte(vcpu, sp, spte, &gentry);
if (!remote_flush && need_remote_flush(entry, *spte))
remote_flush = true;
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index d9a2742014e3..51ef9097960d 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -638,8 +638,9 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
return -EINVAL;
gfn = gpte_to_gfn(gpte);
- if (gfn != sp->gfns[i] ||
- !is_present_gpte(gpte) || !(gpte & PT_ACCESSED_MASK)) {
+ if (is_rsvd_bits_set(vcpu, gpte, PT_PAGE_TABLE_LEVEL)
+ || gfn != sp->gfns[i] || !is_present_gpte(gpte)
+ || !(gpte & PT_ACCESSED_MASK)) {
u64 nonpresent;
if (is_present_gpte(gpte) || !clear_unsync)