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KVM: MMU: Implement guest page fault bypass for nonpae

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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>
This commit is contained in:
Avi Kivity 2007-11-20 21:39:54 +02:00
parent 26e5215fdc
commit e5a4c8cad9
1 changed files with 6 additions and 3 deletions
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9
drivers/kvm/paging_tmpl.h
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@ -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;