tree 34a42659b3e0cbb905c3083b37a62d4e9594d206
parent 0b70068e47e8f0c813a902dc3d6def601fd15acb
author Ard Biesheuvel <ard.biesheuvel@linaro.org> 1410527760 +0200
committer Paolo Bonzini <pbonzini@redhat.com> 1410704765 +0200

KVM: check for !is_zero_pfn() in kvm_is_mmio_pfn()

Read-only memory ranges may be backed by the zero page, so avoid
misidentifying it a a MMIO pfn.

This fixes another issue I identified when testing QEMU+KVM_UEFI, where
a read to an uninitialized emulated NOR flash brought in the zero page,
but mapped as a read-write device region, because kvm_is_mmio_pfn()
misidentifies it as a MMIO pfn due to its PG_reserved bit being set.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Fixes: b88657674d39 ("ARM: KVM: user_mem_abort: support stage 2 MMIO page mapping")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>