From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 01DDEC83F16 for ; Tue, 29 Aug 2023 10:19:30 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qavoC-0000ry-R0; Tue, 29 Aug 2023 06:18:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qavoB-0000qo-0T for qemu-devel@nongnu.org; Tue, 29 Aug 2023 06:18:51 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qavo3-0001SZ-Uv for qemu-devel@nongnu.org; Tue, 29 Aug 2023 06:18:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Gy5eyIGCFHluCSVYb7Kg17gjSDjhMDsrcYiQNshGo2w=; b=HeAsOOR1ZRI3DEJQcLg4muyDE1 /dMmZOToTI3C/ehT87iDRtuKg9VZ8PXygN2PLLPqaaWXmnChHKsxHI5yw4Rxi0QIQ7eDf5ELzXRyo 1rS94CMjhsrp2S7Z0GDq3re8j2tvEAqbXfyHhvyTVkAlw4J8U1mOKGdELhgjLg6AZs+oio/ZCCXxz AFLy0He7/6c++sTh+ARdBGr0K4ztCmEEUKEL6uh/Dioo9Xv7ap0Vyx/8k78s/DchxSvf+NJtlT7oo X1Ymk1vH5y7enkV0o10sq9XapX4HlXiPxUmtvhrGahGP3WJY6+dn0XRHPo/L1fScuN/X8wBaIImIW E/teEDiA==; Received: from 54-240-197-239.amazon.com ([54.240.197.239] helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qavnk-005yoB-N8; Tue, 29 Aug 2023 10:18:24 +0000 Message-ID: Subject: Re: [PATCH v1 01/23] pc/xen: Xen Q35 support: provide IRQ handling for PCI devices From: David Woodhouse To: Joel Upham , qemu-devel@nongnu.org Cc: Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S. Tsirkin" , Marcel Apfelbaum , Stefano Stabellini , Anthony Perard , Paul Durrant , "open list:X86 Xen CPUs" Date: Tue, 29 Aug 2023 11:18:20 +0100 In-Reply-To: <1c547c5581ce6192b70c68f39de108cdb2c73f7e.1687278381.git.jupham125@gmail.com> References: <1c547c5581ce6192b70c68f39de108cdb2c73f7e.1687278381.git.jupham125@gmail.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-PA4AD3XtdmnO4CPGUrzh" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+3a9ed657c5c9a78d2ebc+7310+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 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 --=-PA4AD3XtdmnO4CPGUrzh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-06-20 at 13:24 -0400, Joel Upham wrote: > The primary difference in PCI device IRQ management between Xen HVM and > QEMU is that Xen PCI IRQs are "device-centric" while QEMU PCI IRQs are > "chipset-centric". Namely, Xen uses PCI device BDF and INTx as coordinate= s > to assert IRQ while QEMU finds out to which chipset PIRQ the IRQ is route= d > through the hierarchy of PCI buses and manages IRQ assertion on chipset > side (as PIRQ inputs). >=20 > Two callback functions are used for this purpose: .map_irq and .set_irq > (named after corresponding structure fields). Corresponding Xen-specific > callback functions are piix3_set_irq() and pci_slot_get_pirq(). In Xen > case these functions do not operate on pirq pin numbers. Instead, they us= e > a specific value to pass BDF/INTx information between .map_irq and > .set_irq -- PCI device devfn and INTx pin number are combined into > pseudo-PIRQ in pci_slot_get_pirq, which piix3_set_irq later decodes back > into devfn and INTx number for passing to *set_pci_intx_level() call. >=20 > For Xen on Q35 this scheme is still applicable, with the exception that > function names are non-descriptive now and need to be renamed to show > their common i440/Q35 nature. Proposed new names are: >=20 > xen_pci_slot_get_pirq --> xen_cmn_pci_slot_get_pirq > xen_piix3_set_irq=C2=A0=C2=A0=C2=A0=C2=A0 --> xen_cmn_set_irq >=20 > Another IRQ-related difference between i440 and Q35 is the number of PIRQ > inputs and PIRQ routers (PCI IRQ links in terms of ACPI) available. i440 > has 4 PCI interrupt links, while Q35 has 8 (PIRQA...PIRQH). > Currently Xen have support for only 4 PCI links, so we describe only 4 of > 8 PCI links in ACPI tables. Also, hvmloader disables PIRQ routing for > PIRQE..PIRQH by writing 80h into corresponding PIRQ[n]_ROUT registers. >=20 > All this PCI interrupt routing stuff is largely an ancient legacy from PI= C > era. It's hardly worth to extend number of PCI links supported as we > normally deal with APIC mode and/or MSI interrupts. >=20 > The only useful thing to do with PIRQE..PIRQH routing currently is to > check if guest actually attempts to use it for some reason (despite ACPI > PCI routing information provided). In this case, a warning is logged. >=20 > Things have changed a bit in modern Qemu, and more changes to the IRQ > mapping had to be done inside the lpc_ich9 to write the irqs and setup > the mappings. >=20 > Signed-off-by: Alexey Gerasimenko > Signed-off-by: Joel Upham Please ensure you test Linux guests with attached/emulated PCI devices and (at least) the following command lines: =E2=80=A2 pci=3Dnomsi =E2=80=A2 pci=3Dnomsi noapic =E2=80=A2 xen_no_vector_callback pci=3Dnomsi noapic =E2=80=A2 xen_no_vector_callback pci=3Dnomsi Obviously, with pci=3Dnomsi you're actually *using* PCI INTx, and force it not to use MSI. With noapic you force it to use the i8259. The INTx should be routed to a *different* interrupt number on the i8259 than the I/O APIC. (I thought the IRQ should be asserted on both, but QEMU's ich9_route_intx_pin_to_irq() seems to route to the I/O APIC *only* if it's disabled in the i8259? Sadly, QEMU lacks a comment explaining if that's a faithful emulation of the ICH9, or if it's just a workaround for the fact that that function is only allowed one return value.) This one has potential to be particularly entertaining because the guest may route INTx IRQs to PIRQ event channels. And I think those are supposed to use the I/O APIC pin numbering, *not* the PIC numbering. I *think* you get away with it because of the workaround discussed above. With xen_no_vector_callback you *also* use the emulated INTx of the Xen platform PCI device, for event channel callbacks. We want to test that via both the i8259 and the I/O APIC. 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