[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v4 15/18] spapr_pci_vfio: Enable multiple groups
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [PATCH v4 15/18] spapr_pci_vfio: Enable multiple groups per container |
Date: |
Wed, 18 Feb 2015 10:52:08 +1100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Tue, Feb 17, 2015 at 11:34:27AM +1100, Alexey Kardashevskiy wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 02/05/2015 03:19 PM, David Gibson wrote:
> > On Thu, Jan 29, 2015 at 08:27:27PM +1100, Alexey Kardashevskiy wrote:
> >> This enables multiple IOMMU groups in one VFIO container which
> >> means that multiple devices from different groups can share the same
> >> IOMMU table and locked pages counting can be done once as there is
> >> no need to have several containers for two or more groups.
> >>
> >> This removes a group id from vfio_container_ioctl(). The kernel
> >> support is required for this.
> >>
> >> This adds a check that there is just one VFIO container per PHB
> >> address space.
> >>
> >> Signed-off-by: Alexey Kardashevskiy <address@hidden> ---
> >> hw/ppc/spapr_pci_vfio.c | 9 +++------ hw/vfio/common.c | 33
> >> +++++++++++++++------------------ include/hw/vfio/vfio.h | 2 +- 3
> >> files changed, 19 insertions(+), 25 deletions(-)
> >>
> >> diff --git a/hw/ppc/spapr_pci_vfio.c b/hw/ppc/spapr_pci_vfio.c index
> >> b20ac90..257181d 100644 --- a/hw/ppc/spapr_pci_vfio.c +++
> >> b/hw/ppc/spapr_pci_vfio.c @@ -33,11 +33,10 @@ static int
> >> spapr_pci_vfio_ddw_query(sPAPRPHBState *sphb, uint32_t
> >> *dma32_window_size, uint64_t *dma64_window_size) { -
> >> sPAPRPHBVFIOState *svphb = SPAPR_PCI_VFIO_HOST_BRIDGE(sphb); struct
> >> vfio_iommu_spapr_tce_info info = { .argsz = sizeof(info) }; int
> >> ret;
> >>
> >> - ret = vfio_container_ioctl(&sphb->iommu_as,
> >> svphb->iommugroupid, + ret =
> >> vfio_container_ioctl(&sphb->iommu_as, VFIO_IOMMU_SPAPR_TCE_GET_INFO,
> >> &info);
> >
> >
> > Huh.. so vfio_container_ioctl() is actually only used by the
> > spapr_tce code. What's it doing living in the common vfio code?
>
> vfio_container_ioctl() converts the address space to a container fd. The
> code outside VFIO does not have an idea about these
> container/group/device fds.
Ah, ok I see.
> >> if (ret) { return ret; @@ -55,7 +54,6 @@ static int
> >> spapr_pci_vfio_ddw_create(sPAPRPHBState *sphb, uint32_t liobn,
> >> uint32_t page_shift, uint32_t window_shift, sPAPRTCETable **ptcet)
> >> { - sPAPRPHBVFIOState *svphb = SPAPR_PCI_VFIO_HOST_BRIDGE(sphb);
> >> struct vfio_iommu_spapr_tce_create create = { .argsz =
> >> sizeof(create), .page_shift = page_shift, @@ -65,7 +63,7 @@ static
> >> int spapr_pci_vfio_ddw_create(sPAPRPHBState *sphb, uint32_t liobn,
> >> }; int ret;
> >>
> >> - ret = vfio_container_ioctl(&sphb->iommu_as,
> >> svphb->iommugroupid, + ret =
> >> vfio_container_ioctl(&sphb->iommu_as, VFIO_IOMMU_SPAPR_TCE_CREATE,
> >> &create); if (ret) { return ret; @@ -87,7 +85,6 @@ static int
> >> spapr_pci_vfio_ddw_create(sPAPRPHBState *sphb, uint32_t liobn,
> >>
> >> static int spapr_pci_vfio_ddw_remove(sPAPRPHBState *sphb,
> >> sPAPRTCETable *tcet) { - sPAPRPHBVFIOState *svphb =
> >> SPAPR_PCI_VFIO_HOST_BRIDGE(sphb); struct vfio_iommu_spapr_tce_remove
> >> remove = { .argsz = sizeof(remove), .start_addr = tcet->bus_offset
> >> @@ -95,7 +92,7 @@ static int spapr_pci_vfio_ddw_remove(sPAPRPHBState
> >> *sphb, sPAPRTCETable *tcet) int ret;
> >>
> >> spapr_pci_ddw_remove(sphb, tcet); - ret =
> >> vfio_container_ioctl(&sphb->iommu_as, svphb->iommugroupid, + ret
> >> = vfio_container_ioctl(&sphb->iommu_as, VFIO_IOMMU_SPAPR_TCE_REMOVE,
> >> &remove);
> >>
> >> return ret; diff --git a/hw/vfio/common.c b/hw/vfio/common.c index
> >> 1cafcf8..a26cbae 100644 --- a/hw/vfio/common.c +++
> >> b/hw/vfio/common.c @@ -1011,34 +1011,31 @@ void
> >> vfio_put_base_device(VFIODevice *vbasedev) close(vbasedev->fd); }
> >>
> >> -static int vfio_container_do_ioctl(AddressSpace *as, int32_t
> >> groupid, +static int vfio_container_do_ioctl(AddressSpace *as, int
> >> req, void *param) { - VFIOGroup *group; VFIOContainer
> >> *container; - int ret = -1; + int ret; + VFIOAddressSpace
> >> *space;
> >>
> >> - group = vfio_get_group(groupid, as); - if (!group) { -
> >> error_report("vfio: group %d not registered", groupid); -
> >> return ret; - } + space = vfio_get_address_space(as); +
> >> container = QLIST_FIRST(&space->containers);
> >>
> >> - container = group->container; - if (group->container) { -
> >> ret = ioctl(container->fd, req, param); - if (ret < 0) { -
> >> error_report("vfio: failed to ioctl container: ret=%d, %s", -
> >> ret, strerror(errno)); - } + if (!container ||
> >> QLIST_NEXT(container, next)) { + error_report("vfio: multiple
> >> containers per PHB are not - supported");
> >
> > Shouldn't this be an assert? It's qemu code that sets up the
> > containers after all.
>
>
> The VFIO maintainer does not like asserts and I do not want to do things
> which he does not like unless I really have to :)
Ok.
> > Also the error message is not right for the case of !container.
>
> Right, that I will fix.
>
>
> >> + return -1; }
> >>
> >> - vfio_put_group(group); + ret = ioctl(container->fd, req,
> >> param); + if (ret < 0) { + error_report("vfio: failed to
> >> ioctl container: ret=%d, %s", + ret,
> >> strerror(errno)); + }
> >>
> >> return ret; }
> >>
> >> -int vfio_container_ioctl(AddressSpace *as, int32_t groupid, +int
> >> vfio_container_ioctl(AddressSpace *as, int req, void *param) { /* We
> >> allow only certain ioctls to the container */ @@ -1054,5 +1051,5 @@
> >> int vfio_container_ioctl(AddressSpace *as, int32_t groupid, return
> >> -1; }
> >>
> >> - return vfio_container_do_ioctl(as, groupid, req, param); +
> >> return vfio_container_do_ioctl(as, req, param); } diff --git
> >> a/include/hw/vfio/vfio.h b/include/hw/vfio/vfio.h index
> >> 0b26cd8..76b5744 100644 --- a/include/hw/vfio/vfio.h +++
> >> b/include/hw/vfio/vfio.h @@ -3,7 +3,7 @@
> >>
> >> #include "qemu/typedefs.h"
> >>
> >> -extern int vfio_container_ioctl(AddressSpace *as, int32_t groupid,
> >> +extern int vfio_container_ioctl(AddressSpace *as, int req, void
> >> *param);
> >>
> >> #endif
> >
>
>
> - --
> Alexey
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1
>
> iQIcBAEBAgAGBQJU4oyTAAoJEIYTPdgrwSC5SSUQAJH/KS2rnIXXmyZPnFI9FW+T
> X780EzHZ2OLdIMoxqSF2x4tpxL7TLgt+3ZBkqOhmjFhhPnMGEz4KnLRJYG4VAoZx
> iS5xfbKtR34Dxyz5flhbdTs1BXkUJli5nhiSiXMbQfgsn0ZG2czvvhee9WZExsAL
> 0EM1UdxWP4Y0TD03msRWjCfuUmtZnGF3F0iMf3Yv3uuwXvT5pFQWe6Wf0JJNPUDC
> X3+wvZeGl+gaX3mGbE0iXL4GiWnK+JqkGUt/CrEdnIVD9h0H6wiLY7s82QEkEsK3
> IXRJBfL+TXF/RgKAeCyeVZJzAxbw3PWsb4DKb4U4ByWOmdYxXEq35G99pxZEvPn0
> DHobPUNk1RyTrDVL9n5W7lbwcOc81xCA5A3Y3z2NnOaPt8J/wcYg6qigkvhDpMql
> PIr+1WHAOf++xUDf+EIXhubGSwqNM7FgUDyrvAEWMEUP+ddz74QN9h0LD7ZB/1lR
> svPTE+a/kM2biolzwIPTCdwQXroME7lujB1ynvOEwtiGi5BOjwFTHZ/J7P12iYaZ
> px5S8WI07cR7d9cyMFkeYrwxlBwj10i9NzFDP+1JngbzrVmpf15ekj4CFAxMo7gV
> ubjcQCvOMoCbiljm5Cg7yn1MjlFkp9ZnNAPKv/TVpw6Co4TgljiAMi+w0DsLXJ8y
> DS6iczjry50ZOTpUyWbj
> =UkLT
> -----END PGP SIGNATURE-----
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
pgpANqzeliWfQ.pgp
Description: PGP signature