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[213.175.37.10]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-422870e9676sm189887695e9.24.2024.06.17.03.49.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Jun 2024 03:49:02 -0700 (PDT) Date: Mon, 17 Jun 2024 12:49:01 +0200 From: Igor Mammedov To: Jonathan Cameron Cc: , Markus Armbruster , , , , "Richard Henderson" , Dave Jiang , Huang Ying , Paolo Bonzini , , , , Michael Roth , Ani Sinha Subject: Re: [PATCH qemu ] hw/acpi: Fix big endian host creation of Generic Port Affinity Structures Message-ID: <20240617124901.1414a93f@imammedo.users.ipa.redhat.com> In-Reply-To: <20240614150835.00000674@Huawei.com> References: <20240605180455.18193-1-Jonathan.Cameron@huawei.com> <20240606160653.27226def@imammedo.users.ipa.redhat.com> <20240606184716.00000708@Huawei.com> <20240614125725.730f8914@imammedo-mac> <20240614150835.00000674@Huawei.com> X-Mailer: Claws Mail 4.2.0 (GTK 3.24.42; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=imammedo@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.148, 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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Fri, 14 Jun 2024 15:08:35 +0100 Jonathan Cameron wrote: > On Fri, 14 Jun 2024 12:57:25 +0200 > Igor Mammedov wrote: > > > On Thu, 6 Jun 2024 18:47:16 +0100 > > Jonathan Cameron wrote: > > > > > On Thu, 6 Jun 2024 16:06:53 +0200 > > > Igor Mammedov wrote: > > > > > > > On Wed, 5 Jun 2024 19:04:55 +0100 > > > > Jonathan Cameron wrote: > > > > > > > > > Treating the HID as an integer caused it to get bit reversed > > > > > on big endian hosts running little endian guests. Treat it > > > > > as a character array instead. > > > > > > > > > > Fixes hw/acpi: Generic Port Affinity Structure Support > > > > > Tested-by: Richard Henderson > > > > > Signed-off-by: Jonathan Cameron > > > > > > > > > > --- > > > > > Richard ran the version posted in the thread on an s390 instance. > > > > > Thanks for the help! > > > > > > > > > > Difference from version in thread: > > > > > - Instantiate i in the for loop. > > > > > > > > > > Sending out now so Michael can decide whether to fold this in, or > > > > > drop the GP series for now from his pull request (in which case > > > > > I'll do an updated version with this and Markus' docs feedback > > > > > folded in.) > > > > > > > > > > --- > > > > > include/hw/acpi/acpi_generic_initiator.h | 2 +- > > > > > hw/acpi/acpi_generic_initiator.c | 4 +++- > > > > > 2 files changed, 4 insertions(+), 2 deletions(-) > > > > > > > > > > diff --git a/include/hw/acpi/acpi_generic_initiator.h b/include/hw/acpi/acpi_generic_initiator.h > > > > > index 1a899af30f..5baefda33a 100644 > > > > > --- a/include/hw/acpi/acpi_generic_initiator.h > > > > > +++ b/include/hw/acpi/acpi_generic_initiator.h > > > > > @@ -61,7 +61,7 @@ typedef struct PCIDeviceHandle { > > > > > uint16_t bdf; > > > > > }; > > > > > struct { > > > > > - uint64_t hid; > > > > > + char hid[8]; > > > > > uint32_t uid; > > > > > }; > > > > > }; > > > > > > > > not sure on top of what this patch applies but I have some generic comments wrt it > > > > > > https://lore.kernel.org/qemu-devel/20240524100507.32106-1-Jonathan.Cameron@huawei.com/ > > > > > > Comments are all on elements of the existing upstream code, but I'm touching it > > > anyway so will look at making the improvements you suggest as new precursors > > > to v3 given we are going around again anyway. > > > > > > > > > > > why PCIDeviceHandle is in header file? is there plan for it > > > > being used outside of acpi_generic_initiator.c? > > > > > > I'll add a precursor patch to my series that moves > > > it and anything else that should be more local. May well move > > > to being local in aml_build.c given your later comments with the > > > various fields passed in as parameters. > > > > > > > > > > > > > > > > diff --git a/hw/acpi/acpi_generic_initiator.c b/hw/acpi/acpi_generic_initiator.c > > > > > index 78b80dcf08..f064753b67 100644 > > > > > --- a/hw/acpi/acpi_generic_initiator.c > > > > > +++ b/hw/acpi/acpi_generic_initiator.c > > > > > @@ -151,7 +151,9 @@ build_srat_generic_node_affinity(GArray *table_data, int node, > > > > > build_append_int_noprefix(table_data, 0, 12); > > > > > } else { > > > > > /* Device Handle - ACPI */ > > > > > - build_append_int_noprefix(table_data, handle->hid, 8); > > > > > + for (int i = 0; i < sizeof(handle->hid); i++) { > > > > > + build_append_int_noprefix(table_data, handle->hid[i], 1); > > > > > + } > > > > > build_append_int_noprefix(table_data, handle->uid, 4); > > > > > build_append_int_noprefix(table_data, 0, 4); > > > > > > > > instead of open codding structure > > > > > > > > it might be better to introduce helper in aml_build.c > > > > something like > > > > /* proper reference to spec as we do for other ACPI primitives */ > > > > build_append_srat_acpi_device_handle(GArray *table_data, char* hid, unit32_t uid) > > > > assert(strlen(hid) ... > > > > for() { > > > > build_append_byte() > > > > } > > > > ... > > > > > > > > the same applies to "Device Handle - PCI" structure > > > > > > I'll look at moving that stuff and the affinity structure creation > > > code themselves in there. I think they ended up in this file because > > > of the other infrastructure needed to create these nodes and it > > > will have felt natural to keep this together. > > > > > > Putting it in aml_build.c will put it with similar code though > > > which makes sense to me. > > > > the point of moving handle packing to aml-build.c, > > is to isolate primitives that likely could be reused later on elsewhere > > and hide little endiannes from API user. > > So shuch errors as you are fixing wouldn't be easy to introduce > > (as long as API does it right) > > > > > > Also this API probably should take not packed BDF, i.e. something like this: > > build_append_srat_pci_device_handle(GArray *table_data, bus, dev, func) > > > > Or a packed BDF as you suggest in the later email, but then API function wold have > > to 'decode' that before putting numbers into table, which complicates things > > and likely would pull in PCI deps to unpack BDF, which I'd rather avoid in > > generic aml-build.c > > Ok. I can split it up. My motivation for the encoded version was that > the spec field is defined as a 2 byte field, but it is also broken out > in the description into byte 2 then various bits of byte 3 so we can construct > it that way instead. (were it defined as bits in the 16 bit field this would > make less sense). Should still be obvious enough to anyone trying to > correlate the two. > > Splitting the devfn bit up though is tricky as that doesn't really > have a separate meaning in PCI any more given ARI where it becomes an 8 bit > function ID. So probably makes more sense to keep that as devfn as it's > coming from pci->devfn in that form anyway and they both forms get encoded > into a byte anyway. ack, as long as acpi API user doesn't have to worry about byte order it should be fine > > Jonathan > > > > > > > > > > > > > > > Also get rid of PCI deps in acpi_generic_initiator.c > > > > move build_all_acpi_generic_initiators/build_srat_generic_pci_initiator into > > > > hw/acpi/pci.c > > > > > > Today it's used only for PCI devices, but that's partly an artifact > > > of how we get to the root complex via the bus below it. > > > > > > Spec wise, it's just as applicable to platform devices etc, but maybe > > > we can move it to pci.c for now and move it out again if it gains other > > > users. Or leave it in acpi_generic_initiator.c but have all the aml > > > stuff in aml_build.c as you suggest. > > > > > > > file if it has to access PCI code/structures directly > > > > (which I'm not convinced it should, can we get/expose what it needs as QOM properties?) > > > > > > Maybe. I'll see what I can come up with. This feels involved > > > however so I'm more doubtful about this as a precursor. > > > > > > > > > > > btw: > > > > build_all_acpi_generic_initiators() name doesn't match what it's doing. > > > > it composes only one initiator entry. > > > > > > I'll look at tidying up all the relevant naming. > > > > > > Jonathan > > > > > > > > > > > > } > > > > > > > > > > > > > > > >