[PATCH 27/33] KVM: MMU: Treat user-mode faults as a hint that a page is no longer a page table

[Avi Kivity]

Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>

Index: linux-2.6/drivers/kvm/paging_tmpl.h
===================================================================
--- linux-2.6.orig/drivers/kvm/paging_tmpl.h
+++ linux-2.6/drivers/kvm/paging_tmpl.h
@@ -271,6 +271,7 @@ static int FNAME(fix_write_pf)(struct kv
        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 kv
        }
 
        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;
-
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