KVM: MMU: fix for calculating gpa in invlpg code
Xiao Guangrong [Wed, 28 Apr 2010 03:54:44 +0000 (11:54 +0800)]
If the guest is 32-bit, we should use 'quadrant' to adjust gpa
offset

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/kvm/paging_tmpl.h

index d0cc07e..3464fdb 100644 (file)
@@ -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)) {