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authorRoedel, Joerg <Joerg.Roedel@amd.com>2011-04-20 15:33:16 +0200
committerAvi Kivity <avi@redhat.com>2011-05-22 08:39:26 -0400
commita78484c60e35555d6e0e5b1eb83d4913621c59fb (patch)
treeca0c7ec1e95aa3b6087ae0191a19fa1e0d4ca6b0
parent13db70eca62c5bbb2cbbf6b23dadb94065d363d1 (diff)
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KVM: MMU: Make cmpxchg_gpte aware of nesting too
This patch makes the cmpxchg_gpte() function aware of the difference between l1-gfns and l2-gfns when nested virtualization is in use. This fixes a potential data-corruption problem in the l1-guest and makes the code work correct (at least as correct as the hardware which is emulated in this code) again. Cc: stable@kernel.org Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
-rw-r--r--arch/x86/kvm/paging_tmpl.h30
1 files changed, 23 insertions, 7 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 74f8567..1b68990 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -78,15 +78,21 @@ static gfn_t gpte_to_gfn_lvl(pt_element_t gpte, int lvl)
return (gpte & PT_LVL_ADDR_MASK(lvl)) >> PAGE_SHIFT;
}
-static bool FNAME(cmpxchg_gpte)(struct kvm *kvm,
+static int FNAME(cmpxchg_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
gfn_t table_gfn, unsigned index,
pt_element_t orig_pte, pt_element_t new_pte)
{
pt_element_t ret;
pt_element_t *table;
struct page *page;
+ gpa_t gpa;
- page = gfn_to_page(kvm, table_gfn);
+ gpa = mmu->translate_gpa(vcpu, table_gfn << PAGE_SHIFT,
+ PFERR_USER_MASK|PFERR_WRITE_MASK);
+ if (gpa == UNMAPPED_GVA)
+ return -EFAULT;
+
+ page = gfn_to_page(vcpu->kvm, gpa_to_gfn(gpa));
table = kmap_atomic(page, KM_USER0);
ret = CMPXCHG(&table[index], orig_pte, new_pte);
@@ -192,11 +198,17 @@ walk:
#endif
if (!eperm && !rsvd_fault && !(pte & PT_ACCESSED_MASK)) {
+ int ret;
trace_kvm_mmu_set_accessed_bit(table_gfn, index,
sizeof(pte));
- if (FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn,
- index, pte, pte|PT_ACCESSED_MASK))
+ ret = FNAME(cmpxchg_gpte)(vcpu, mmu, table_gfn,
+ index, pte, pte|PT_ACCESSED_MASK);
+ if (ret < 0) {
+ present = false;
+ break;
+ } else if (ret)
goto walk;
+
mark_page_dirty(vcpu->kvm, table_gfn);
pte |= PT_ACCESSED_MASK;
}
@@ -245,13 +257,17 @@ walk:
goto error;
if (write_fault && !is_dirty_gpte(pte)) {
- bool ret;
+ int ret;
trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte));
- ret = FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, index, pte,
+ ret = FNAME(cmpxchg_gpte)(vcpu, mmu, table_gfn, index, pte,
pte|PT_DIRTY_MASK);
- if (ret)
+ if (ret < 0) {
+ present = false;
+ goto error;
+ } else if (ret)
goto walk;
+
mark_page_dirty(vcpu->kvm, table_gfn);
pte |= PT_DIRTY_MASK;
walker->ptes[walker->level - 1] = pte;