Merge git://git.infradead.org/~dedekind/ubi-2.6

[linux-2.6-omap-h63xx.git] / arch / x86 / kvm / mmu.c

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index d8172aabc660de7503c43b697fea470d81f7eb9a..e55af12e11b7aeb523ff0296d7e525d2f7a33a6d 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -222,8 +222,7 @@ static int is_io_pte(unsigned long pte)
 
 static int is_rmap_pte(u64 pte)
 {
-       return pte != shadow_trap_nonpresent_pte
-               && pte != shadow_notrap_nonpresent_pte;
+       return is_shadow_present_pte(pte);
 }
 
 static gfn_t pse36_gfn_delta(u32 gpte)
@@ -893,14 +892,25 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
                         int *ptwrite, gfn_t gfn, struct page *page)
 {
        u64 spte;
-       int was_rmapped = is_rmap_pte(*shadow_pte);
+       int was_rmapped = 0;
        int was_writeble = is_writeble_pte(*shadow_pte);
+       hfn_t host_pfn = (*shadow_pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
 
        pgprintk("%s: spte %llx access %x write_fault %d"
                 " user_fault %d gfn %lx\n",
                 __FUNCTION__, *shadow_pte, pt_access,
                 write_fault, user_fault, gfn);
 
+       if (is_rmap_pte(*shadow_pte)) {
+               if (host_pfn != page_to_pfn(page)) {
+                       pgprintk("hfn old %lx new %lx\n",
+                                host_pfn, page_to_pfn(page));
+                       rmap_remove(vcpu->kvm, shadow_pte);
+               }
+               else
+                       was_rmapped = 1;
+       }
+
        /*
         * We don't set the accessed bit, since we sometimes want to see
         * whether the guest actually used the pte (in order to detect
@@ -1402,7 +1412,7 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
        up_read(&current->mm->mmap_sem);
 
        vcpu->arch.update_pte.gfn = gfn;
-       vcpu->arch.update_pte.page = gfn_to_page(vcpu->kvm, gfn);
+       vcpu->arch.update_pte.page = page;
 }
 
 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,