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 D3BFFCE835C for ; Mon, 30 Sep 2024 15:51:23 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1svIfU-0003Ln-EC; Mon, 30 Sep 2024 11:50:37 -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 1svIfS-0003ET-MF for qemu-devel@nongnu.org; Mon, 30 Sep 2024 11:50:34 -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 1svIfQ-0000Xn-5a for qemu-devel@nongnu.org; Mon, 30 Sep 2024 11:50:34 -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=FV1aADBTzrLAK7G63lf2zmNcusuud/wQyRz87RsgH0c=; b=TLASOMfkKvkFPeXO6lzdROzgug hVh87UbiPfvQjrvqcES5nWE/RXLNZ/QFhVoTwYMZIqcE+A/cir65tqyxxuIwgNVRtMaezWOswqFA4 L283bQ7J5h88ttfoyBcFVm9MXMxXJ8aul4PrPRYVM0awMHUNqSA5HuOgxk+5dGgvUoCNIHyX5mqIy QM8uabK91UoiFQcxgxtpJuVOSwTebofsDUpR7ay08DntcYNKhsDfyXj4I9J5/uOi0j/0eO5KKNi1P gW4hbl7jRnQZV+Dx9acObJ2OlW+dtAiKzvZ3fVODs3QjNKO3//OXB159rxIPiEXO0pYvzShicoKlC yI/Lq7Qg==; Received: from [2001:8b0:10b:5:30ed:4be7:8b5d:b42b] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1svIfG-000000002Ap-12SM; Mon, 30 Sep 2024 15:50:23 +0000 Message-ID: <7571cdc42d6d69db0ac98ffc99801d11de1de129.camel@infradead.org> Subject: Re: More than 255 vcpus Windows VM setup without viommu ? From: David Woodhouse To: Sandesh Patel , "qemu-devel@nongnu.org" , paul Cc: Rob Scheepens , Prerna Saxena , Alexander Graf Date: Mon, 30 Sep 2024 16:50:21 +0100 In-Reply-To: References: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-pczrRdHH39HKmHAHqZLd" 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+d85baba0dd44d3e2cbbf+7708+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 --=-pczrRdHH39HKmHAHqZLd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2024-09-28 at 15:59 +0100, David Woodhouse wrote: > On Tue, 2024-07-02 at 05:17 +0000, Sandesh Patel wrote: > >=20 > > The error is due to invalid MSIX routing entry passed to KVM. > >=20 > > The VM boots fine if we attach a vIOMMU but adding a vIOMMU can > > potentially result in IO performance loss in guest. > > I was interested to know if someone could boot a large Windows VM by > > some other means like kvm-msi-ext-dest-id. >=20 > I think I may (with Alex Graf's suggestion) have found the Windows bug > with Intel IOMMU. >=20 > It looks like when interrupt remapping is enabled with an AMD CPU, > Windows *assumes* it can generate AMD-style MSI messages even if the > IOMMU is an Intel one. If we put a little hack into the IOMMU interrupt > remapping to make it interpret an AMD-style message, Windows seems to > boot at least a little bit further than it did before... Sadly, Windows has *more* bugs than that. The previous hack extracted the Interrupt Remapping Table Entry (IRTE) index from an AMD-style MSI message, and looked it up in the Intel IOMMU's IR Table. That works... for the MSIs generated by the I/O APIC. However... in the Intel IOMMU model, there is a single global IRT, and each entry specifies which devices are permitted to invoke it. The AMD model is slightly nicer, in that it allows a per-device IRT. So for a PCI device, Windows just seems to configure each MSI vector in order, with IRTE#0, 1, onwards. Because it's a per-device number space, right? Which means that first MSI vector on a PCI device gets aliased to IRQ#0 on the I/O APIC. I dumped the whole IRT, and it isn't just that Windows is using the wrong index; it hasn't even set up the correct destination in *any* of the entries. So we can't even do a nasty trick like scanning and funding the Nth entry which is valid for a particular source-id. Happily, Windows has *more* bugs than that... if I run with `-cpu host,+hv-avic' then it puts the high bits of the target APIC ID into the high bits of the MSI address. This *ought* to mean that MSIs from device miss the APIC (at 0x00000000FEExxxxx) and scribble over guest memory at addresses like 0x1FEE00004. But we can add yet *another* hack to catch that. For now I just hacked it to move the low 7 extra bits in to the "right" place for the 15-bit extension. --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -361,6 +361,14 @@ static void pci_msi_trigger(PCIDevice *dev, MSIMessage= msg) return; } attrs.requester_id =3D pci_requester_id(dev); + printf("Send MSI 0x%lx/0x%x from 0x%x\n", msg.address, msg.data, attrs= .requester_id); + if (msg.address >> 32) { + uint64_t ext_id =3D msg.address >> 32; + msg.address &=3D 0xffffffff; + msg.address |=3D ext_id << 5; + printf("Now 0x%lx/0x%x with ext_id %lx\n", msg.address, msg.data, = ext_id); + } + =20 address_space_stl_le(&dev->bus_master_as, msg.address, msg.data, attrs, NULL); } We also need to stop forcing Windows to use logical mode, and force it to use physical mode instead: --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -158,7 +158,7 @@ static void init_common_fadt_data(MachineState *ms, Obj= ect *o, * used */ ((ms->smp.max_cpus > 8) ? - (1 << ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL) : 0), + (1 << ACPI_FADT_F_FORCE_APIC_PHYSICAL_DESTINATION_= MODE) : 0), .int_model =3D 1 /* Multiple APIC */, .rtc_century =3D RTC_CENTURY, .plvl2_lat =3D 0xfff /* C2 state not supported */, So now, with *no* IOMMU configured, Windows Server 2022 is booting and using CPUs > 255: Send MSI 0x1fee01000/0x41b0 from 0xfa Now 0xfee01020/0x41b0 with ext_id 1 That trick obviously can't work the the I/O APIC, but I haven't managed to persuade Windows to target I/O APIC interrupts at any CPU other than #0 yet. I'm trying to make QEMU run with *only* higher APIC IDs, to test. It may be that we need to advertise an Intel IOMMU that *only* has the I/O APIC behind it, and all the actual PCI devices are direct, so we can abuse that last Windows bug. --=-pczrRdHH39HKmHAHqZLd Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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