From: David Woodhouse <dwmw2@infradead.org> To: "Michael S. Tsirkin" <mst@redhat.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com>, Andy Lutomirski <luto@kernel.org>, linux-kernel@vger.kernel.org, Joerg Roedel <jroedel@suse.de>, Cornelia Huck <cornelia.huck@de.ibm.com>, Sebastian Ott <sebott@linux.vnet.ibm.com>, Paolo Bonzini <pbonzini@redhat.com>, Christoph Hellwig <hch@lst.de>, benh@kernel.crashing.org, KVM <kvm@vger.kernel.org>, Martin Schwidefsky <schwidefsky@de.ibm.com>, linux-s390 <linux-s390@vger.kernel.org>, virtualization@lists.linux-foundation.org Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff Date: Wed, 28 Oct 2015 23:13:29 +0900 [thread overview] Message-ID: <1446041609.3405.228.camel@infradead.org> (raw) In-Reply-To: <20151028155105-mutt-send-email-mst@redhat.com> [-- Attachment #1: Type: text/plain, Size: 1159 bytes --] On Wed, 2015-10-28 at 16:05 +0200, Michael S. Tsirkin wrote: > > Short answer - platforms need a way to discover, and express different > security requirements of different devices. Sure. PLATFORMS need that. Do not let it go anywhere near your device drivers. Including the virtio drivers. > If they continue to lack that, we'll need a custom API in virtio, > and while this seems a bit less elegant, I would not see that as > the end of the world at all, there are not that many virtio drivers. No. If they continue to lack that, we fix them. This is a *platform* issue. The DMA API shall do the right thing. Do not second-guess it. (From the other mail) > > > OK so I guess that means we should prefer a transport-specific > > > interface in virtio-pci then. > > > > Why? > > Because you said you are doing something device tree specific for > ARM, aren't you? Nonono. The ARM platform code might do that, and the DMA API on ARM *might* give you I/O virtual addresses that look a lot like the physical addresses you asked it to map. That's none of your business. Drivers use DMA API. No more talky. -- dwmw2 [-- Attachment #2: smime.p7s --] [-- Type: application/x-pkcs7-signature, Size: 5691 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: David Woodhouse <dwmw2@infradead.org> To: "Michael S. Tsirkin" <mst@redhat.com> Cc: linux-s390 <linux-s390@vger.kernel.org>, Joerg Roedel <jroedel@suse.de>, KVM <kvm@vger.kernel.org>, benh@kernel.crashing.org, Sebastian Ott <sebott@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Christian Borntraeger <borntraeger@de.ibm.com>, Andy Lutomirski <luto@kernel.org>, Paolo Bonzini <pbonzini@redhat.com>, Christoph Hellwig <hch@lst.de>, Martin Schwidefsky <schwidefsky@de.ibm.com> Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff Date: Wed, 28 Oct 2015 23:13:29 +0900 [thread overview] Message-ID: <1446041609.3405.228.camel@infradead.org> (raw) In-Reply-To: <20151028155105-mutt-send-email-mst@redhat.com> [-- Attachment #1.1: Type: text/plain, Size: 1159 bytes --] On Wed, 2015-10-28 at 16:05 +0200, Michael S. Tsirkin wrote: > > Short answer - platforms need a way to discover, and express different > security requirements of different devices. Sure. PLATFORMS need that. Do not let it go anywhere near your device drivers. Including the virtio drivers. > If they continue to lack that, we'll need a custom API in virtio, > and while this seems a bit less elegant, I would not see that as > the end of the world at all, there are not that many virtio drivers. No. If they continue to lack that, we fix them. This is a *platform* issue. The DMA API shall do the right thing. Do not second-guess it. (From the other mail) > > > OK so I guess that means we should prefer a transport-specific > > > interface in virtio-pci then. > > > > Why? > > Because you said you are doing something device tree specific for > ARM, aren't you? Nonono. The ARM platform code might do that, and the DMA API on ARM *might* give you I/O virtual addresses that look a lot like the physical addresses you asked it to map. That's none of your business. Drivers use DMA API. No more talky. -- dwmw2 [-- Attachment #1.2: smime.p7s --] [-- Type: application/x-pkcs7-signature, Size: 5691 bytes --] [-- Attachment #2: Type: text/plain, Size: 183 bytes --] _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2015-10-28 14:13 UTC|newest] Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-10-28 6:38 [PATCH v3 0/3] virtio DMA API core stuff Andy Lutomirski 2015-10-28 6:38 ` [PATCH v3 1/3] virtio_net: Stop doing DMA from the stack Andy Lutomirski 2015-10-28 7:08 ` Michael S. Tsirkin 2015-10-28 7:08 ` Michael S. Tsirkin 2015-10-28 6:38 ` Andy Lutomirski 2015-10-28 6:38 ` [PATCH v3 2/3] virtio_ring: Support DMA APIs Andy Lutomirski 2015-10-28 6:38 ` Andy Lutomirski 2015-10-28 6:39 ` [PATCH v3 3/3] virtio_pci: Use the DMA API Andy Lutomirski 2015-10-28 6:39 ` Andy Lutomirski 2015-10-28 6:53 ` [PATCH v3 0/3] virtio DMA API core stuff David Woodhouse 2015-10-28 6:53 ` David Woodhouse 2015-10-28 7:09 ` Andy Lutomirski 2015-10-28 7:09 ` Andy Lutomirski 2015-10-28 7:17 ` Michael S. Tsirkin 2015-10-28 7:17 ` Michael S. Tsirkin 2015-10-28 7:40 ` Christian Borntraeger 2015-10-28 7:40 ` Christian Borntraeger 2015-10-28 8:09 ` David Woodhouse 2015-10-28 8:09 ` David Woodhouse 2015-10-28 11:35 ` Michael S. Tsirkin 2015-10-28 11:35 ` Michael S. Tsirkin 2015-10-28 13:35 ` David Woodhouse 2015-10-28 13:35 ` David Woodhouse 2015-10-28 14:05 ` Michael S. Tsirkin 2015-10-28 14:05 ` Michael S. Tsirkin 2015-10-28 14:13 ` David Woodhouse [this message] 2015-10-28 14:13 ` David Woodhouse 2015-10-28 14:22 ` Michael S. Tsirkin 2015-10-28 14:22 ` Michael S. Tsirkin 2015-10-28 14:32 ` David Woodhouse 2015-10-28 14:32 ` David Woodhouse 2015-10-28 16:12 ` Michael S. Tsirkin 2015-10-28 22:51 ` Andy Lutomirski 2015-10-28 22:51 ` Andy Lutomirski 2015-10-29 9:01 ` Michael S. Tsirkin 2015-10-29 9:01 ` Michael S. Tsirkin 2015-10-29 16:18 ` David Woodhouse 2015-10-29 16:18 ` David Woodhouse 2015-11-08 10:37 ` Michael S. Tsirkin 2015-11-08 10:37 ` Michael S. Tsirkin 2015-11-08 11:49 ` Joerg Roedel 2015-11-08 11:49 ` Joerg Roedel 2015-11-10 15:02 ` Michael S. Tsirkin 2015-11-10 15:02 ` Michael S. Tsirkin 2015-11-10 18:54 ` Andy Lutomirski 2015-11-10 18:54 ` Andy Lutomirski 2015-11-11 10:05 ` Michael S. Tsirkin 2015-11-11 10:05 ` Michael S. Tsirkin 2015-11-11 15:56 ` Andy Lutomirski 2015-11-11 22:30 ` David Woodhouse 2015-11-11 22:30 ` David Woodhouse 2015-11-12 11:09 ` Michael S. Tsirkin 2015-11-12 11:09 ` Michael S. Tsirkin 2015-11-12 12:18 ` David Woodhouse 2015-11-12 12:18 ` David Woodhouse 2015-11-11 15:56 ` Andy Lutomirski 2015-11-22 13:06 ` Marcel Apfelbaum 2015-11-22 13:06 ` Marcel Apfelbaum 2015-11-22 15:54 ` David Woodhouse 2015-11-22 15:54 ` David Woodhouse 2015-11-22 17:04 ` Marcel Apfelbaum 2015-11-22 17:04 ` Marcel Apfelbaum 2015-11-22 22:11 ` Michael S. Tsirkin 2015-11-22 22:11 ` Michael S. Tsirkin 2015-11-08 12:00 ` David Woodhouse 2015-11-08 12:00 ` David Woodhouse 2015-10-30 15:16 ` Joerg Roedel 2015-10-30 15:16 ` Joerg Roedel 2015-11-11 9:11 ` Michael S. Tsirkin 2015-11-11 9:11 ` Michael S. Tsirkin 2015-10-30 16:54 ` David Woodhouse 2015-10-30 16:54 ` David Woodhouse 2015-11-03 10:24 ` Paolo Bonzini 2015-11-03 10:24 ` Paolo Bonzini 2015-10-28 16:12 ` Michael S. Tsirkin 2015-10-28 8:36 ` Benjamin Herrenschmidt 2015-10-28 8:36 ` Benjamin Herrenschmidt 2015-10-28 11:23 ` Michael S. Tsirkin 2015-10-28 11:23 ` Michael S. Tsirkin 2015-10-28 13:37 ` David Woodhouse 2015-10-28 13:37 ` David Woodhouse 2015-10-28 14:07 ` Michael S. Tsirkin 2015-10-28 14:07 ` Michael S. Tsirkin 2015-11-19 13:45 ` Michael S. Tsirkin 2015-11-19 13:45 ` Michael S. Tsirkin 2015-11-19 21:59 ` Andy Lutomirski 2015-11-19 21:59 ` Andy Lutomirski 2015-11-19 23:38 ` David Woodhouse 2015-11-19 23:38 ` David Woodhouse 2015-11-20 2:56 ` Benjamin Herrenschmidt 2015-11-20 2:56 ` Benjamin Herrenschmidt 2015-11-20 8:34 ` Michael S. Tsirkin 2015-11-20 8:34 ` Michael S. Tsirkin 2015-11-20 8:21 ` Michael S. Tsirkin 2015-11-20 8:21 ` Michael S. Tsirkin 2015-11-22 15:58 ` David Woodhouse 2015-11-22 15:58 ` David Woodhouse 2015-11-22 21:52 ` Michael S. Tsirkin 2015-11-22 21:52 ` Michael S. Tsirkin 2015-11-22 22:21 ` David Woodhouse 2015-11-22 22:21 ` David Woodhouse 2015-11-23 7:56 ` Michael S. Tsirkin 2015-11-23 7:56 ` Michael S. Tsirkin 2015-11-22 22:21 ` David Woodhouse 2015-11-22 22:21 ` David Woodhouse 2015-11-20 6:56 ` Michael S. Tsirkin 2015-11-20 6:56 ` Michael S. Tsirkin 2015-11-20 7:47 ` Michael S. Tsirkin 2015-11-20 7:47 ` Michael S. Tsirkin -- strict thread matches above, loose matches on Subject: below -- 2015-10-28 6:38 Andy Lutomirski
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