diff options
| -rw-r--r-- | virt/kvm/kvm_main.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7dd9b0b85e4..5eb96c7c8d7 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -76,6 +76,14 @@ static inline int valid_vcpu(int n) return likely(n >= 0 && n < KVM_MAX_VCPUS); } +static inline int is_mmio_pfn(pfn_t pfn) +{ + if (pfn_valid(pfn)) + return PageReserved(pfn_to_page(pfn)); + + return true; +} + /* * Switches to specified vcpu, until a matching vcpu_put() */ @@ -740,7 +748,7 @@ pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) } pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; - BUG_ON(pfn_valid(pfn)); + BUG_ON(!is_mmio_pfn(pfn)); } else pfn = page_to_pfn(page[0]); @@ -754,10 +762,10 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) pfn_t pfn; pfn = gfn_to_pfn(kvm, gfn); - if (pfn_valid(pfn)) + if (!is_mmio_pfn(pfn)) return pfn_to_page(pfn); - WARN_ON(!pfn_valid(pfn)); + WARN_ON(is_mmio_pfn(pfn)); get_page(bad_page); return bad_page; @@ -773,7 +781,7 @@ EXPORT_SYMBOL_GPL(kvm_release_page_clean); void kvm_release_pfn_clean(pfn_t pfn) { - if (pfn_valid(pfn)) + if (!is_mmio_pfn(pfn)) put_page(pfn_to_page(pfn)); } EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); @@ -799,7 +807,7 @@ EXPORT_SYMBOL_GPL(kvm_set_page_dirty); void kvm_set_pfn_dirty(pfn_t pfn) { - if (pfn_valid(pfn)) { + if (!is_mmio_pfn(pfn)) { struct page *page = pfn_to_page(pfn); if (!PageReserved(page)) SetPageDirty(page); @@ -809,14 +817,14 @@ EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); void kvm_set_pfn_accessed(pfn_t pfn) { - if (pfn_valid(pfn)) + if (!is_mmio_pfn(pfn)) mark_page_accessed(pfn_to_page(pfn)); } EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); void kvm_get_pfn(pfn_t pfn) { - if (pfn_valid(pfn)) + if (!is_mmio_pfn(pfn)) get_page(pfn_to_page(pfn)); } EXPORT_SYMBOL_GPL(kvm_get_pfn); |