If the guest is 32-bit, we should use 'quadrant' to adjust gpa
offset
Changelog v3:
- use smart way to fix this bug address Avi's suggestion
Changelog v2:
- when level is PT_DIRECTORY_LEVEL, the 'offset' should be
'role.quadrant << 8', thanks Avi for point it out
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>
---
arch/x86/kvm/paging_tmpl.h | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index d0cc07e..3464fdb 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -478,8 +478,13 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
((level == PT_DIRECTORY_LEVEL && is_large_pte(*sptep))) ||
((level == PT_PDPE_LEVEL && is_large_pte(*sptep)))) {
struct kvm_mmu_page *sp = page_header(__pa(sptep));
+ int offset, shift;
- pte_gpa = (sp->gfn << PAGE_SHIFT);
+ shift = PAGE_SHIFT -
+ (PT_LEVEL_BITS - PT64_LEVEL_BITS) * level;
+ offset = sp->role.quadrant << shift;
+
+ pte_gpa = (sp->gfn << PAGE_SHIFT) + offset;
pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t);
if (is_shadow_present_pte(*sptep)) {
--
1.6.1.2
--
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