Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again
On Mon, Feb 01, 2016 at 10:04:07AM -0800, Andy Lutomirski wrote: > On Mon, Feb 1, 2016 at 3:00 AM, Wei Liuwrote: > > Nice work, Andy. > > > > On Thu, Jan 28, 2016 at 06:31:13PM -0800, Andy Lutomirski wrote: > >> This switches virtio to use the DMA API on Xen and if requested by > >> module option. > >> > >> This fixes virtio on Xen, and it should break anything because it's > >> off by default on everything except Xen PV on x86. > >> > > > > What is your setup? My understanding is that virtio doesn't work on PV > > guest as of now because a suitable transport is missing. > > I cheated and ran Xen under KVM with the virtio-pci device provided by > QEMU. If you have virtme > (https://git.kernel.org/cgit/utils/kernel/virtme/virtme.git/), you can > do: > Thanks for the clarification. This is exactly what I needed to know. In that case virtio-pci transport is used. All virtio devices are exposed as PCI devices. Wei. > virtme-run --kdir=. --pwd --xen xen-4.5.2 --qemu-opts -smp 3 -m 1024 > > where xen-4.5.2 is the gunzipped Xen binary. (Other versions work, too.) > > --Andy ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again
Nice work, Andy. On Thu, Jan 28, 2016 at 06:31:13PM -0800, Andy Lutomirski wrote: > This switches virtio to use the DMA API on Xen and if requested by > module option. > > This fixes virtio on Xen, and it should break anything because it's > off by default on everything except Xen PV on x86. > What is your setup? My understanding is that virtio doesn't work on PV guest as of now because a suitable transport is missing. Wei. ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again
On Mon, Feb 1, 2016 at 3:00 AM, Wei Liuwrote: > Nice work, Andy. > > On Thu, Jan 28, 2016 at 06:31:13PM -0800, Andy Lutomirski wrote: >> This switches virtio to use the DMA API on Xen and if requested by >> module option. >> >> This fixes virtio on Xen, and it should break anything because it's >> off by default on everything except Xen PV on x86. >> > > What is your setup? My understanding is that virtio doesn't work on PV > guest as of now because a suitable transport is missing. I cheated and ran Xen under KVM with the virtio-pci device provided by QEMU. If you have virtme (https://git.kernel.org/cgit/utils/kernel/virtme/virtme.git/), you can do: virtme-run --kdir=. --pwd --xen xen-4.5.2 --qemu-opts -smp 3 -m 1024 where xen-4.5.2 is the gunzipped Xen binary. (Other versions work, too.) --Andy ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again
On Sun, Jan 31, 2016 at 12:12 PM, Michael S. Tsirkinwrote: > On Thu, Jan 28, 2016 at 06:31:13PM -0800, Andy Lutomirski wrote: >> This switches virtio to use the DMA API on Xen and if requested by >> module option. >> >> This fixes virtio on Xen, and it should break anything because it's >> off by default on everything except Xen PV on x86. >> >> To the Xen people: is this okay? If it doesn't work on other Xen >> variants (PVH? HVM?), can you submit follow-up patches to fix it? >> >> To everyone else: we've waffled on this for way too long. 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. > > I agree, thanks for working on this! > >> Michael, if these survive review, can you stage these in your tree? > > Yes, I'll stage everything except 10/10. I'd rather not maintain a > module option like this, things work for now and I'm working on a > clean solution for things like dpdk within guest. The module option was mainly for testing, but patching in a "return true" works just as well. I ran the code through the DMA API debugging stuff and swiotlb=force with the module option set under KVM (no Xen), and everything seemed to work. --Andy ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again
On Thu, Jan 28, 2016 at 06:31:13PM -0800, Andy Lutomirski wrote: > This switches virtio to use the DMA API on Xen and if requested by > module option. > > This fixes virtio on Xen, and it should break anything because it's > off by default on everything except Xen PV on x86. > > To the Xen people: is this okay? If it doesn't work on other Xen > variants (PVH? HVM?), can you submit follow-up patches to fix it? > > To everyone else: we've waffled on this for way too long. 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. I agree, thanks for working on this! > Michael, if these survive review, can you stage these in your tree? Yes, I'll stage everything except 10/10. I'd rather not maintain a module option like this, things work for now and I'm working on a clean solution for things like dpdk within guest. So far I saw some comments on 9/10. > Can you also take a look at tools/virtio? I probably broke it, but I > couldn't get it to build without these patches either, so I'm stuck. Will do. > Changes from v4: > - Bake vring_use_dma_api in from the beginning. > - Automatically enable only on Xen. > - Add module parameter. > - Add s390 and alpha DMA API implementations. > - Rebase to 4.5-rc1. > > Changes from v3: > - More big-endian fixes. > - Added better virtio-ring APIs that handle allocation and use them in >virtio-mmio and virtio-pci. > - Switch to Michael's virtio-net patch. > > Changes from v2: > - Fix vring_mapping_error incorrect argument > > Changes from v1: > - Fix an endian conversion error causing a BUG to hit. > - Fix a DMA ordering issue (swiotlb=force works now). > - Minor cleanups. > > Andy Lutomirski (7): > vring: Introduce vring_use_dma_api() > virtio_ring: Support DMA APIs > virtio: Add improved queue allocation API > virtio_mmio: Use the DMA API if enabled > virtio_pci: Use the DMA API if enabled > vring: Use the DMA API on Xen > vring: Add a module parameter to force-enable the DMA API > > Christian Borntraeger (3): > dma: Provide simple noop dma ops > alpha/dma: use common noop dma ops > s390/dma: Allow per device dma ops > > arch/alpha/kernel/pci-noop.c| 46 +--- > arch/s390/Kconfig | 6 +- > arch/s390/include/asm/device.h | 6 +- > arch/s390/include/asm/dma-mapping.h | 6 +- > arch/s390/pci/pci.c | 1 + > arch/s390/pci/pci_dma.c | 4 +- > drivers/virtio/Kconfig | 2 +- > drivers/virtio/virtio_mmio.c| 67 ++ > drivers/virtio/virtio_pci_common.h | 6 - > drivers/virtio/virtio_pci_legacy.c | 42 ++-- > drivers/virtio/virtio_pci_modern.c | 61 ++ > drivers/virtio/virtio_ring.c| 412 > ++-- > include/linux/dma-mapping.h | 2 + > include/linux/virtio.h | 23 +- > include/linux/virtio_ring.h | 35 +++ > lib/Makefile| 1 + > lib/dma-noop.c | 75 +++ > tools/virtio/linux/dma-mapping.h| 17 ++ > 18 files changed, 568 insertions(+), 244 deletions(-) > create mode 100644 lib/dma-noop.c > create mode 100644 tools/virtio/linux/dma-mapping.h > > -- > 2.5.0 ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again
On Fri, Jan 29, 2016 at 11:01:00AM +, David Woodhouse wrote: > 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? What I've done for 4.5 is to switch all architectures to use DMA ops. This should make it fairly easy to have a generic dma ops pointer in the devie structure, but I have no need for that yet, and thus no short term plans to do that work myself. ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Re: [Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again
On Thu, 2016-01-28 at 18:31 -0800, Andy Lutomirski wrote: > > To everyone else: we've waffled on this for way too long. 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. -- David WoodhouseOpen Source Technology Centre david.woodho...@intel.com Intel Corporation smime.p7s Description: S/MIME cryptographic signature ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
[Xen-devel] [PATCH v5 00/10] virtio DMA API, yet again
This switches virtio to use the DMA API on Xen and if requested by module option. This fixes virtio on Xen, and it should break anything because it's off by default on everything except Xen PV on x86. To the Xen people: is this okay? If it doesn't work on other Xen variants (PVH? HVM?), can you submit follow-up patches to fix it? To everyone else: we've waffled on this for way too long. 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. Michael, if these survive review, can you stage these in your tree? Can you also take a look at tools/virtio? I probably broke it, but I couldn't get it to build without these patches either, so I'm stuck. Changes from v4: - Bake vring_use_dma_api in from the beginning. - Automatically enable only on Xen. - Add module parameter. - Add s390 and alpha DMA API implementations. - Rebase to 4.5-rc1. Changes from v3: - More big-endian fixes. - Added better virtio-ring APIs that handle allocation and use them in virtio-mmio and virtio-pci. - Switch to Michael's virtio-net patch. Changes from v2: - Fix vring_mapping_error incorrect argument Changes from v1: - Fix an endian conversion error causing a BUG to hit. - Fix a DMA ordering issue (swiotlb=force works now). - Minor cleanups. Andy Lutomirski (7): vring: Introduce vring_use_dma_api() virtio_ring: Support DMA APIs virtio: Add improved queue allocation API virtio_mmio: Use the DMA API if enabled virtio_pci: Use the DMA API if enabled vring: Use the DMA API on Xen vring: Add a module parameter to force-enable the DMA API Christian Borntraeger (3): dma: Provide simple noop dma ops alpha/dma: use common noop dma ops s390/dma: Allow per device dma ops arch/alpha/kernel/pci-noop.c| 46 +--- arch/s390/Kconfig | 6 +- arch/s390/include/asm/device.h | 6 +- arch/s390/include/asm/dma-mapping.h | 6 +- arch/s390/pci/pci.c | 1 + arch/s390/pci/pci_dma.c | 4 +- drivers/virtio/Kconfig | 2 +- drivers/virtio/virtio_mmio.c| 67 ++ drivers/virtio/virtio_pci_common.h | 6 - drivers/virtio/virtio_pci_legacy.c | 42 ++-- drivers/virtio/virtio_pci_modern.c | 61 ++ drivers/virtio/virtio_ring.c| 412 ++-- include/linux/dma-mapping.h | 2 + include/linux/virtio.h | 23 +- include/linux/virtio_ring.h | 35 +++ lib/Makefile| 1 + lib/dma-noop.c | 75 +++ tools/virtio/linux/dma-mapping.h| 17 ++ 18 files changed, 568 insertions(+), 244 deletions(-) create mode 100644 lib/dma-noop.c create mode 100644 tools/virtio/linux/dma-mapping.h -- 2.5.0 ___ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel