From 143646567f6dcd584e1ab359b5ec83e0545e70cf Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Fri, 5 Jan 2007 16:36:52 -0800 Subject: [PATCH] KVM: MMU: Treat user-mode faults as a hint that a page is no longer a page table Signed-off-by: Avi Kivity Acked-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/kvm/paging_tmpl.h | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h index 03c474aaedde..6acb16ea5ce2 100644 --- a/drivers/kvm/paging_tmpl.h +++ b/drivers/kvm/paging_tmpl.h @@ -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; -- cgit v1.2.1