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kvm: fix kvm_is_mmio_pfn() and rename to kvm_is_reserved_pfn()

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This reverts commit 85c8555ff0 ("KVM: check for !is_zero_pfn() in
kvm_is_mmio_pfn()") and renames the function to kvm_is_reserved_pfn.

The problem being addressed by the patch above was that some ARM code
based the memory mapping attributes of a pfn on the return value of
kvm_is_mmio_pfn(), whose name indeed suggests that such pfns should
be mapped as device memory.

However, kvm_is_mmio_pfn() doesn't do quite what it says on the tin,
and the existing non-ARM users were already using it in a way which
suggests that its name should probably have been 'kvm_is_reserved_pfn'
from the beginning, e.g., whether or not to call get_page/put_page on
it etc. This means that returning false for the zero page is a mistake
and the patch above should be reverted.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Ard Biesheuvel 2014-11-10 09:33:56 +01:00 • committed by Paolo Bonzini
commit d3fccc7ef8
4 changed files with 13 additions and 13 deletions
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2
include/linux/kvm_host.h
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@ -703,7 +703,7 @@ void kvm_arch_sync_events(struct kvm *kvm);
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
bool kvm_is_mmio_pfn(pfn_t pfn);
bool kvm_is_reserved_pfn(pfn_t pfn);
struct kvm_irq_ack_notifier {
struct hlist_node link;