[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [RFC v2 07/28] hw/vfio/common: Refactor container initi
From: |
Greg Kurz |
Subject: |
Re: [Qemu-devel] [RFC v2 07/28] hw/vfio/common: Refactor container initialization |
Date: |
Mon, 22 Oct 2018 16:39:23 +0200 |
On Fri, 21 Sep 2018 10:17:58 +0200
Eric Auger <address@hidden> wrote:
> To prepare for testing yet another extension, let's
> refactor the code. We introduce vfio_iommu_get_type()
> helper which selects the richest API (v2 first). Then
> vfio_init_container() does the SET_CONTAINER and
> SET_IOMMU ioctl calls. So we end up with a switch/case
> on the iommu_type which should be a little bit more readable
> when introducing the NESTING extension check. Also ioctl's
> get called once per iommu_type.
>
> Signed-off-by: Eric Auger <address@hidden>
> ---
> hw/vfio/common.c | 102 ++++++++++++++++++++++++++++++-----------------
> 1 file changed, 65 insertions(+), 37 deletions(-)
>
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index 7c185e5a2e..53b8f773cc 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -1036,12 +1036,58 @@ static void vfio_put_address_space(VFIOAddressSpace
> *space)
> }
> }
>
> +/*
> + * vfio_iommu_get_type - selects the richest iommu_type (v2 first)
> + * nested only is selected if requested by @force_nested
It seems the second line belongs to patch 8.
Appart from that, this definitely makes the code more readable.
Reviewed-by: Greg Kurz <address@hidden>
> + */
> +static int vfio_iommu_get_type(VFIOContainer *container,
> + Error **errp)
> +{
> + int fd = container->fd;
> +
> + if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) {
> + return VFIO_TYPE1v2_IOMMU;
> + } else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) {
> + return VFIO_TYPE1_IOMMU;
> + } else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_v2_IOMMU)) {
> + return VFIO_SPAPR_TCE_v2_IOMMU;
> + } else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_IOMMU)) {
> + return VFIO_SPAPR_TCE_IOMMU;
> + } else {
> + error_setg(errp, "No available IOMMU models");
> + return -EINVAL;
> + }
> +}
> +
> +static int vfio_init_container(VFIOContainer *container, int group_fd,
> + int iommu_type, Error **errp)
> +{
> + int ret;
> +
> + ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
> + if (ret) {
> + error_setg_errno(errp, errno, "failed to set group container");
> + return -errno;
> + }
> +
> + ret = ioctl(container->fd, VFIO_SET_IOMMU, iommu_type);
> + if (ret) {
> + error_setg_errno(errp, errno, "failed to set iommu for container");
> + return -errno;
> + }
> + container->iommu_type = iommu_type;
> + return 0;
> +}
> +
> static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
> Error **errp)
> {
> VFIOContainer *container;
> int ret, fd;
> VFIOAddressSpace *space;
> + int iommu_type;
> + bool v2 = false;
> +
>
> space = vfio_get_address_space(as);
>
> @@ -1101,23 +1147,20 @@ static int vfio_connect_container(VFIOGroup *group,
> AddressSpace *as,
> container->fd = fd;
> QLIST_INIT(&container->giommu_list);
> QLIST_INIT(&container->hostwin_list);
> - if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) ||
> - ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) {
> - bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU);
> +
> + iommu_type = vfio_iommu_get_type(container, errp);
> + if (iommu_type < 0) {
> + goto free_container_exit;
> + }
> +
> + switch (iommu_type) {
> + case VFIO_TYPE1v2_IOMMU:
> + case VFIO_TYPE1_IOMMU:
> + {
> struct vfio_iommu_type1_info info;
>
> - ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
> + ret = vfio_init_container(container, group->fd, iommu_type, errp);
> if (ret) {
> - error_setg_errno(errp, errno, "failed to set group container");
> - ret = -errno;
> - goto free_container_exit;
> - }
> -
> - container->iommu_type = v2 ? VFIO_TYPE1v2_IOMMU : VFIO_TYPE1_IOMMU;
> - ret = ioctl(fd, VFIO_SET_IOMMU, container->iommu_type);
> - if (ret) {
> - error_setg_errno(errp, errno, "failed to set iommu for
> container");
> - ret = -errno;
> goto free_container_exit;
> }
>
> @@ -1137,28 +1180,16 @@ static int vfio_connect_container(VFIOGroup *group,
> AddressSpace *as,
> }
> vfio_host_win_add(container, 0, (hwaddr)-1, info.iova_pgsizes);
> container->pgsizes = info.iova_pgsizes;
> - } else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_IOMMU) ||
> - ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_v2_IOMMU)) {
> + break;
> + }
> + case VFIO_SPAPR_TCE_v2_IOMMU:
> + v2 = true;
> + case VFIO_SPAPR_TCE_IOMMU:
> + {
> struct vfio_iommu_spapr_tce_info info;
> - bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_v2_IOMMU);
>
> - ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
> + ret = vfio_init_container(container, group->fd, iommu_type, errp);
> if (ret) {
> - error_setg_errno(errp, errno, "failed to set group container");
> - ret = -errno;
> - goto free_container_exit;
> - }
> - container->iommu_type =
> - v2 ? VFIO_SPAPR_TCE_v2_IOMMU : VFIO_SPAPR_TCE_IOMMU;
> - ret = ioctl(fd, VFIO_SET_IOMMU, container->iommu_type);
> - if (ret) {
> - container->iommu_type = VFIO_SPAPR_TCE_IOMMU;
> - v2 = false;
> - ret = ioctl(fd, VFIO_SET_IOMMU, container->iommu_type);
> - }
> - if (ret) {
> - error_setg_errno(errp, errno, "failed to set iommu for
> container");
> - ret = -errno;
> goto free_container_exit;
> }
>
> @@ -1222,10 +1253,7 @@ static int vfio_connect_container(VFIOGroup *group,
> AddressSpace *as,
> info.dma32_window_size - 1,
> 0x1000);
> }
> - } else {
> - error_setg(errp, "No available IOMMU models");
> - ret = -EINVAL;
> - goto free_container_exit;
> + }
> }
>
> vfio_kvm_device_add_group(group);
- Re: [Qemu-devel] [RFC v2 07/28] hw/vfio/common: Refactor container initialization,
Greg Kurz <=