[PATCH 1/5] KVM: PCIPT: direct mmio pfn check

[Ben-Ami Yassour]

In some cases it is not enough to identify mmio memory slots by
pfn_valid. This patch adds checking the PageReserved as well.

Signed-off-by: Ben-Ami Yassour <[EMAIL PROTECTED]>
Signed-off-by: Muli Ben-Yehuda <[EMAIL PROTECTED]>
---
 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 a845890..e4db5b2 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()
  */
@@ -593,7 +601,7 @@ 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]);
 
@@ -607,10 +615,10 @@ 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;
@@ -626,7 +634,7 @@ 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);
@@ -652,7 +660,7 @@ 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);
@@ -662,14 +670,14 @@ 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);
-- 
1.5.6

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