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KVM: x86: reintroduce kvm_is_mmio_pfn

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The call to get_mt_mask was really using kvm_is_reserved_pfn to
detect an MMIO-backed page.  In this case, we want "false" to be
returned for the zero page.

Reintroduce a separate kvm_is_mmio_pfn predicate for this use
only.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-07-07 15:03:18 +02:00
parent 5d75a74759
commit d1fe921955
1 changed files with 9 additions and 1 deletions
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10
arch/x86/kvm/mmu.c
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@ -2479,6 +2479,14 @@ static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
return 0;
}
static bool kvm_is_mmio_pfn(pfn_t pfn)
{
if (pfn_valid(pfn))
return !is_zero_pfn(pfn) && PageReserved(pfn_to_page(pfn));
return true;
}
static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
unsigned pte_access, int level,
gfn_t gfn, pfn_t pfn, bool speculative,
@ -2506,7 +2514,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
spte |= PT_PAGE_SIZE_MASK;
if (tdp_enabled)
spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn,
kvm_is_reserved_pfn(pfn));
kvm_is_mmio_pfn(pfn));
if (host_writable)
spte |= SPTE_HOST_WRITEABLE;