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[PATCH] KVM: MMU: Treat user-mode faults as a hint that a page is no longer a page table 

Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Avi Kivity 2007-01-05 16:36:52 -08:00 committed by Linus Torvalds
parent 32b3562735
commit 143646567f
1 changed files with 12 additions and 1 deletions
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13
drivers/kvm/paging_tmpl.h
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@ -271,6 +271,7 @@ static int FNAME(fix_write_pf)(struct kvm_vcpu *vcpu,
pt_element_t *guest_ent;
int writable_shadow;
gfn_t gfn;
struct kvm_mmu_page *page;
if (is_writeble_pte(*shadow_ent))
return 0;
@ -303,7 +304,17 @@ static int FNAME(fix_write_pf)(struct kvm_vcpu *vcpu,
}
gfn = walker->gfn;
if (kvm_mmu_lookup_page(vcpu, gfn)) {
if (user) {
/*
* Usermode page faults won't be for page table updates.
*/
while ((page = kvm_mmu_lookup_page(vcpu, gfn)) != NULL) {
pgprintk("%s: zap %lx %x\n",
__FUNCTION__, gfn, page->role.word);
kvm_mmu_zap_page(vcpu, page);
}
} else if (kvm_mmu_lookup_page(vcpu, gfn)) {
pgprintk("%s: found shadow page for %lx, marking ro\n",
__FUNCTION__, gfn);
*write_pt = 1;