• Ard Biesheuvel's avatar
    kvm: fix kvm_is_mmio_pfn() and rename to kvm_is_reserved_pfn() · d3fccc7e
    Ard Biesheuvel authored
    This reverts commit 85c8555f ("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: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    d3fccc7e
kvm-ia64.c 43.5 KB