From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH RFC] fixup! virtio: convert to use DMA api Date: Mon, 18 Apr 2016 10:03:52 -0400 Message-ID: <1460988232.22654.7.camel__4032.00114747069$1460990484$gmane$org@infradead.org> References: <1460979793-6621-1-git-send-email-mst@redhat.com> <1460980717.12793.43.camel@infradead.org> <20160418160731-mutt-send-email-mst@redhat.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6267555761537182391==" Return-path: In-Reply-To: <20160418160731-mutt-send-email-mst@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: "Michael S. Tsirkin" Cc: Wei Liu , Andy Lutomirski , qemu-block@nongnu.org, Christian Borntraeger , qemu-devel@nongnu.org, peterx@redhat.com, linux-kernel@vger.kernel.org, Amit Shah , Stefan Hajnoczi , kvm@vger.kernel.org, pbonzini@redhat.com, virtualization@lists.linux-foundation.org List-Id: virtualization@lists.linuxfoundation.org --===============6267555761537182391== Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-mB4IQ/ium+uXcv+/bGju" --=-mB4IQ/ium+uXcv+/bGju Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2016-04-18 at 16:12 +0300, Michael S. Tsirkin wrote: > I'm not sure I understand the issue.=C2=A0=C2=A0The public API is not abo= ut how > the driver works.=C2=A0=C2=A0It doesn't say "don't use DMA API" anywhere,= does it? > It's about telling device whether to obey the IOMMU and > about discovering whether a device is in fact under the IOMMU. Apologies, I was wrongly reading this as a kernel patch. After a brief struggle with "telling device whether to obey the IOMMU", which is obviously completely impossible from the guest kernel, I realise my mistake :) So... on x86 how does this get reflected in the DMAR tables that the guest BIOS presents to the guest kernel, so that the guest kernel *knows* which devices are behind which IOMMU? (And are you fixing the case of assigned PCI devices, which aren't behind any IOMMU, at the same time as you answer that? :) --=20 dwmw2 --=-mB4IQ/ium+uXcv+/bGju Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG 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