From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH v5 00/10] virtio DMA API, yet again Date: Fri, 29 Jan 2016 11:01:00 +0000 Message-ID: <1454065260.133285.107.camel__18539.8856680424$1454065305$gmane$org@infradead.org> References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============4647783187765160787==" Return-path: In-Reply-To: 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: Andy Lutomirski , "Michael S. Tsirkin" Cc: Joerg Roedel , KVM , linux-s390 , Benjamin Herrenschmidt , Stefano Stabellini , Sebastian Ott , "linux-kernel@vger.kernel.org" , Christoph Hellwig , Christian Borntraeger , David Vrabel , xen-devel@lists.xenproject.org, sparclinux@vger.kernel.org, Paolo Bonzini , Linux Virtualization , "David S. Miller" , Martin Schwidefsky List-Id: virtualization@lists.linuxfoundation.org --===============4647783187765160787== Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-B66K+frlGITQLtPROWKb" --=-B66K+frlGITQLtPROWKb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2016-01-28 at 18:31 -0800, Andy Lutomirski wrote: >=20 > To everyone else: we've waffled on this for way too long.=C2=A0 I think > we should to get DMA API implementation in with a conservative > policy like this rather than waiting until we achieve perfection. > I'm tired of carrying these patches around. Yeah, do it. However,,, shouldn't the generic no-op DMA ops be checking the dma_mask of the device and bitching if it can't reach the address in question? Also, wasn't Christoph looking at making per-device DMA ops more generic instead of an 'archdata' thing on basically every platform? Or did I just imagine that part? Not that I'm suggesting you make the s390 patch wait for that *instead* of using archdata there, mind you. But I was kind of planning to let the dust settle on this lot before I sort out the theoretical-except- in-simulation issues with VT-d IOMMU covering *some* devices but not all. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-B66K+frlGITQLtPROWKb 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 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