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| author | Avi Kivity <avi@qumranet.com> | 2007-11-20 22:39:54 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-01-30 18:53:09 +0300 |
| commit | e5a4c8cad952d6e060991841f3632578ab3ae133 (patch) | |
| tree | 85f98599534c78cf95f090471ceaaacd29ab2a34 /drivers/kvm/paging_tmpl.h | |
| parent | 26e5215fdc6cf7b5a8b1269134095abbb7338b3c (diff) | |
| download | linux-e5a4c8cad952d6e060991841f3632578ab3ae133.tar.xz | |
KVM: MMU: Implement guest page fault bypass for nonpae
I spent an hour worrying why I see so many guest page faults on FC6 i386.
Turns out bypass wasn't implemented for nonpae. Implement it so it doesn't
happen again.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/paging_tmpl.h')
| -rw-r--r-- | drivers/kvm/paging_tmpl.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h index bf15d127a48f..92b93134a2a6 100644 --- a/drivers/kvm/paging_tmpl.h +++ b/drivers/kvm/paging_tmpl.h @@ -486,19 +486,22 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) { - int i; + int i, offset = 0; pt_element_t *gpt; struct page *page; - if (sp->role.metaphysical || PTTYPE == 32) { + if (sp->role.metaphysical + || (PTTYPE == 32 && sp->role.level > PT_PAGE_TABLE_LEVEL)) { nonpaging_prefetch_page(vcpu, sp); return; } + if (PTTYPE == 32) + offset = sp->role.quadrant << PT64_LEVEL_BITS; page = gfn_to_page(vcpu->kvm, sp->gfn); gpt = kmap_atomic(page, KM_USER0); for (i = 0; i < PT64_ENT_PER_PAGE; ++i) - if (is_present_pte(gpt[i])) + if (is_present_pte(gpt[offset + i])) sp->spt[i] = shadow_trap_nonpresent_pte; else sp->spt[i] = shadow_notrap_nonpresent_pte; |