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A recent change to the PciIoMap() function now propagates the return code from the IoMmu protocol SetAttribute() operation. The implementation of this operation in OvmfPkg/IoMmuDxe/CcIoMmu.c returns EFI_UNSUPPORTED, resulting in a failure to boot the guest. Provide an implementation for SetAttribute() that validates the IoMmu access method being requested against the IoMmu mapping operation. Suggested-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Message-Id: <c0f9e95f557b601a045da015c1a97201e8aec2ab.1706634932.git.thomas.lendacky@amd.com> Tested-by: Min Xu <min.m.xu@intel.com> Reviewed-by: Min Xu <min.m.xu@intel.com>