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 4FD3EC3271E for ; Mon, 8 Jul 2024 09:14:04 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sQkRM-00057l-82; Mon, 08 Jul 2024 05:13:44 -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 1sQkRJ-00056z-KQ for qemu-devel@nongnu.org; Mon, 08 Jul 2024 05:13:42 -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 1sQkR8-0002sL-JC for qemu-devel@nongnu.org; Mon, 08 Jul 2024 05:13:41 -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=wFZY+bVlCncJ3wryKxbz1/DeMOQ1WemvD+RP4peflHU=; b=gCm1Vh76hFw8w3vnd46Ugm5Tea GBAbAr3Vc9JNZoQWwhLAFnog/RmegJxlFtoYrmcRs1cn1Xfv7MZ3RdFj9lGmkUO1q6+6WvF8zx3HB c/Mog5gWOVSjMzy7JdBElidLQngd2GSIw66JShs2v0sattSlKqXWeZXnemuQKvQRuQtWsTrevk3Uj 2UmEmjgOOCodWHwLZ1HLgDrIFAKlMjA7Jm6bcUJDCtdihDfS+cOkSfPelQK5+su5GwRLuKRgxlnmm WVXBdVD88Oe+cXW31ma0xdo1xSAYJ0Vl0M5+sK4W/yH/LpfsyvqFAzLkyUi/f+UERn2jzfTYEfDXI k3T3guEw==; Received: from [2001:8b0:10b:5:6b09:42c7:5b33:77f2] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sQkR1-00000006giN-0K5E; Mon, 08 Jul 2024 09:13:23 +0000 Message-ID: <39b92288418839e9cdba447705a44a8e216dedc3.camel@infradead.org> Subject: Re: More than 255 vcpus Windows VM setup without viommu ? From: David Woodhouse To: Sandesh Patel Cc: "qemu-devel@nongnu.org" , Rob Scheepens , Prerna Saxena , Dexuan Cui Date: Mon, 08 Jul 2024 10:13:22 +0100 In-Reply-To: <7BBA47BD-AC3D-4F12-A860-AD3F2B509257@nutanix.com> References: <3bb7c269ab0a13fe4398d2c7920d2f6bf8e86d47.camel@infradead.org> <7BBA47BD-AC3D-4F12-A860-AD3F2B509257@nutanix.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-cPo7WbZr0eAeA5i+DUp7" 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+a495452fc5bbce0c6044+7624+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org 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_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 --=-cPo7WbZr0eAeA5i+DUp7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2024-07-03 at 16:01 +0000, Sandesh Patel wrote: > >=20 > > Interesting. What exactly has Windows *done* in those MSI entries? > > That > > might give a clue about how to support it. >=20 > The KVM_SET_GSI_ROUTING ioctl calls kvm_set_routing_entry function in > kvm. >=20 > int kvm_set_routing_entry(struct kvm *kvm, struct > kvm_kernel_irq_routing_entry *e, > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0const struct kvm_irq_routing_entry *ue) > { >=20 > =C2=A0=C2=A0=C2=A0=C2=A0switch (ue->type) { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0case KVM_IRQ_ROUTING_MSI: > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0e->set =3D kvm_set_msi; > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0e->msi.address_lo =3D ue-= >u.msi.address_lo; > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0e->msi.address_hi =3D ue-= >u.msi.address_hi; > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0e->msi.data =3D ue->u.msi= .data; >=20 > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (kvm_msi_route_invalid= (kvm, e)) > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0return -EIN= VAL; > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 break; > =C2=A0=C2=A0=C2=A0=C2=A0} > } >=20 > static inline bool kvm_msi_route_invalid(struct kvm *kvm, > =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0struct kvm_kernel_irq_routing_entry *e) > { > =C2=A0 =C2=A0 return kvm->arch.x2apic_format && (e->msi.address_hi & 0xff= ); > } >=20 > That means msi.address_hi must have 0 in the last byte. >=20 > Qemu function=C2=A0kvm_arch_fixup_msi_route is responsible for > fixing=C2=A0msi.address_hi value in=C2=A0 > msi routing entry that is passed to kvm. > This function got msi.addr_hi:=C2=A0 0x0 in input when iommu was enabled > and msi.addr_hi:=C2=A0 0x1 > when viommu was not enabled for one of the entry.=C2=A0The same value was > returned in the output.=C2=A0 > and saved as routing entry. That's after QEMU has translated it though. Precisely which MSI is this, belonging to which device, and what exactly did Windows write to the MSI table? If *Windows* put anything into the high address bits, that isn't even targeted at the APIC, and it would be an attempt at writing to actual memory. I suspect that isn't the case. Can you make kvm_arch_fixup_msi_route() print the actual address and data directly from the guest?=20 --=-cPo7WbZr0eAeA5i+DUp7 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 AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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