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Tsirkin" , qemu-devel@nongnu.org References: <20200730155755.188845-1-mst@redhat.com> <20200730155755.188845-2-mst@redhat.com> From: Laszlo Ersek Message-ID: Date: Thu, 30 Jul 2020 21:35:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20200730155755.188845-2-mst@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=205.139.110.61; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/30 03:41:52 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Eduardo Habkost , Shannon Zhao , qemu-arm@nongnu.org, Paolo Bonzini , Igor Mammedov , vit9696 , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 07/30/20 17:58, Michael S. Tsirkin wrote: > On ARM/virt machine type QEMU currently reports an incorrect _UID in > ACPI. > > The particular node in question is the primary PciRoot (PCI0 in ACPI), > which gets assigned PCI0 in ACPI UID and 0 in the > DevicePath. This is due to the _UID assigned to it by build_dsdt in > hw/arm/virt-acpi-build.c Which does not correspond to the primary PCI > identifier given by pcibus_num in hw/pci/pci.c > > In UEFI v2.8, section "10.4.2 Rules with ACPI _HID and _UID" ends with > the paragraph, > > Root PCI bridges will use the plug and play ID of PNP0A03, This will > be stored in the ACPI Device Path _HID field, or in the Expanded > ACPI Device Path _CID field to match the ACPI name space. The _UID > in the ACPI Device Path structure must match the _UID in the ACPI > name space. > > (See especially the last sentence.) > > A similar bug has been reported on i386, on that architecture it has > been reported to confuse at least macOS which uses ACPI UIDs to build > the DevicePath for NVRAM boot options, while OVMF firmware gets them via > an internal channel through QEMU. When UEFI firmware and ACPI have > different values, this makes the underlying operating system unable to > report its boot option. > > Reported-by: vit9696 > Signed-off-by: Michael S. Tsirkin > --- > > Peter can you either ack or merge this one pls? > > hw/arm/virt-acpi-build.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c > index 91f0df7b13..0a482ff6f7 100644 > --- a/hw/arm/virt-acpi-build.c > +++ b/hw/arm/virt-acpi-build.c > @@ -170,7 +170,7 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap, > aml_append(dev, aml_name_decl("_CID", aml_string("PNP0A03"))); > aml_append(dev, aml_name_decl("_SEG", aml_int(0))); > aml_append(dev, aml_name_decl("_BBN", aml_int(0))); > - aml_append(dev, aml_name_decl("_UID", aml_string("PCI0"))); > + aml_append(dev, aml_name_decl("_UID", aml_int(0))); > aml_append(dev, aml_name_decl("_STR", aml_unicode("PCIe 0 Device"))); > aml_append(dev, aml_name_decl("_CCA", aml_int(1))); > > Reviewed-by: Laszlo Ersek (Vitaly's full name could be included in the Reported-by here as well, arguably.) Thanks! Laszlo