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Thu, 23 Nov 2023 00:11:30 +0000 From: Volodymyr Babchuk To: Vikram Garhwal CC: Stefano Stabellini , "qemu-devel@nongnu.org" , David Woodhouse , Julien Grall , Oleksandr Tyshchenko , Peter Maydell , Anthony Perard , Paul Durrant , "open list:ARM TCG CPUs" , "open list:X86 Xen CPUs" Subject: Re: [PATCH v2 6/6] xen_arm: Add virtual PCIe host bridge support Thread-Topic: [PATCH v2 6/6] xen_arm: Add virtual PCIe host bridge support Thread-Index: AQHaHMeJqHnam8LJkECFe490J2r1JLCG8AcAgAASMYCAAAZ1AA== Date: Thu, 23 Nov 2023 00:11:30 +0000 Message-ID: <8734wxz5u6.fsf@epam.com> References: <20231121221023.419901-1-volodymyr_babchuk@epam.com> <20231121221023.419901-7-volodymyr_babchuk@epam.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: mu4e 1.10.7; emacs 29.1 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: VI1PR03MB3710:EE_|AS8PR03MB6903:EE_ x-ms-office365-filtering-correlation-id: 768970b3-d05e-4ab3-f5b0-08dbebb8be57 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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envelope-from=prvs=5691553e4c=volodymyr_babchuk@epam.com; helo=mx0a-0039f301.pphosted.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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-arm@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-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: vJd3Ou+u/Tqz Hi Vikram, Vikram Garhwal writes: > Hi Volodymyr, > Thank you sharing this patch. I have few comments below > On Wed, Nov 22, 2023 at 02:39:46PM -0800, Stefano Stabellini wrote: >> +Vikram >>=20 >> On Tue, 21 Nov 2023, Volodymyr Babchuk wrote: >> > From: Oleksandr Tyshchenko >> >=20 >> > The bridge is needed for virtio-pci support, as QEMU can emulate the >> > whole bridge with any virtio-pci devices connected to it. >> >=20 >> > This patch provides a flexible way to configure PCIe brige resources >> > with xenstore. We made this for several reasons: >> >=20 >> > - We don't want to clash with vPCI devices, so we need information >> > from Xen toolstack on which PCI bus to use. >> > - The guest memory layout that describes these resources is not stable >> > and may vary between guests, so we cannot rely on static resources >> > to be always the same for both ends. >> > - Also the device-models which run in different domains and serve >> > virtio-pci devices for the same guest should use different host >> > bridge resources for Xen to distinguish. The rule for the guest >> > device-tree generation is one PCI host bridge per backend domain. >> >=20 >> > Signed-off-by: Oleksandr Tyshchenko >> > Signed-off-by: Volodymyr Babchuk >>=20 >> There is still a discussion ongoing on xen-devel if / how to register a >> PCI Root Complex or individual BDFs. In the meantime a couple of >> comments. >>=20 >> Typically emulated devices are configured in QEMU via QEMU command line >> parameters, not xenstore. If you are running QEMU in a domU (instead of >> Dom0) you can always read config parameters from xenstore from a wrapper >> bash script (using xenstore-read) and then pass the right command line >> options to QEMU. >>=20 >> If you need help in adding new QEMU command line options, Vikram (CCed) >> can help. >>=20 >>=20 > I agree with Stefano here. Setting properties would be better and easier. Okay, I'll look at this. > I have one questions here: > 1. If there are multiple QEMU backends, which means xen tools will end up > creating lot of entries in xenstore and we need to remove those xenstore > entries when backend goes away. Is this already handled in Xen tools? Well, this is not a classic PV backend, so common code in Xen Tools does not handle those entries. I am not sure if tools remove entries right now, because I am not the original author. But we definitely will remove them in the final version of patches. --=20 WBR, Volodymyr=