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Re: [RFC v3 11/25] vfio: get stage-1 pasid formats from Kernel
From: |
Peter Xu |
Subject: |
Re: [RFC v3 11/25] vfio: get stage-1 pasid formats from Kernel |
Date: |
Tue, 11 Feb 2020 14:30:22 -0500 |
On Wed, Jan 29, 2020 at 04:16:42AM -0800, Liu, Yi L wrote:
> From: Liu Yi L <address@hidden>
>
> VFIO checks IOMMU UAPI version when it finds Kernel supports
> VFIO_TYPE1_NESTING_IOMMU. It is enough for UAPI compatibility
> check. However, IOMMU UAPI may support multiple stage-1 pasid
> formats in a specific UAPI version, which is highly possible
> since IOMMU UAPI supports stage-1 formats across all IOMMU vendors.
> So VFIO needs to get the supported formats from Kernel and tell
> vIOMMU. Let vIOMMU select proper format when setup dual stage DMA
> translation.
>
> This patch gets the stage-1 pasid format from kernel by using IOCTL
> VFIO_IOMMU_GET_INFO and pass the supported format to vIOMMU by the
> DualStageIOMMUObject instance which has been registered to vIOMMU.
>
> This patch referred some code from Shameer Kolothum.
> https://lists.gnu.org/archive/html/qemu-devel/2018-05/msg03759.html
>
> Cc: Kevin Tian <address@hidden>
> Cc: Jacob Pan <address@hidden>
> Cc: Peter Xu <address@hidden>
> Cc: Eric Auger <address@hidden>
> Cc: Yi Sun <address@hidden>
> Cc: David Gibson <address@hidden>
> Cc: Alex Williamson <address@hidden>
> Signed-off-by: Shameer Kolothum <address@hidden>
> Signed-off-by: Liu Yi L <address@hidden>
> ---
> hw/iommu/dual_stage_iommu.c | 5 ++-
> hw/vfio/common.c | 85
> ++++++++++++++++++++++++++++++++++++-
> include/hw/iommu/dual_stage_iommu.h | 10 ++++-
> 3 files changed, 97 insertions(+), 3 deletions(-)
>
> diff --git a/hw/iommu/dual_stage_iommu.c b/hw/iommu/dual_stage_iommu.c
> index be4179d..d5a7168 100644
> --- a/hw/iommu/dual_stage_iommu.c
> +++ b/hw/iommu/dual_stage_iommu.c
> @@ -48,9 +48,12 @@ int ds_iommu_pasid_free(DualStageIOMMUObject *dsi_obj,
> uint32_t pasid)
> }
>
> void ds_iommu_object_init(DualStageIOMMUObject *dsi_obj,
> - DualStageIOMMUOps *ops)
> + DualStageIOMMUOps *ops,
> + DualStageIOMMUInfo *uinfo)
> {
> dsi_obj->ops = ops;
> +
> + dsi_obj->uinfo.pasid_format = uinfo->pasid_format;
> }
>
> void ds_iommu_object_destroy(DualStageIOMMUObject *dsi_obj)
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index fc1723d..a07824b 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -1182,10 +1182,84 @@ static int vfio_get_iommu_type(VFIOContainer
> *container,
> static struct DualStageIOMMUOps vfio_ds_iommu_ops = {
> };
>
> +static int vfio_get_iommu_info(VFIOContainer *container,
> + struct vfio_iommu_type1_info **info)
Better comment on the function to remember to free(*info) after use
for the callers.
> +{
> +
> + size_t argsz = sizeof(struct vfio_iommu_type1_info);
> +
Nit: extra newline.
> +
> + *info = g_malloc0(argsz);
> +
> +retry:
> + (*info)->argsz = argsz;
> +
> + if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
> + g_free(*info);
> + *info = NULL;
> + return -errno;
> + }
> +
> + if (((*info)->argsz > argsz)) {
> + argsz = (*info)->argsz;
> + *info = g_realloc(*info, argsz);
> + goto retry;
> + }
> +
> + return 0;
> +}
> +
> +static struct vfio_info_cap_header *
> +vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
> +{
> + struct vfio_info_cap_header *hdr;
> + void *ptr = info;
> +
> + if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
> + return NULL;
> + }
> +
> + for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
> + if (hdr->id == id) {
> + return hdr;
> + }
> + }
> +
> + return NULL;
> +}
> +
> +static int vfio_get_nesting_iommu_format(VFIOContainer *container,
> + uint32_t *pasid_format)
> +{
> + struct vfio_iommu_type1_info *info;
> + struct vfio_info_cap_header *hdr;
> + struct vfio_iommu_type1_info_cap_nesting *cap;
> +
> + if (vfio_get_iommu_info(container, &info)) {
> + return -errno;
Should return the retcode from vfio_get_iommu_info.
> + }
> +
> + hdr = vfio_get_iommu_info_cap(info,
> + VFIO_IOMMU_TYPE1_INFO_CAP_NESTING);
> + if (!hdr) {
> + g_free(info);
> + return -errno;
> + }
> +
> + cap = container_of(hdr,
> + struct vfio_iommu_type1_info_cap_nesting, header);
> + *pasid_format = cap->pasid_format;
> +
> + g_free(info);
> + return 0;
> +}
> +
> static int vfio_init_container(VFIOContainer *container, int group_fd,
> Error **errp)
> {
> int iommu_type, ret;
> + uint32_t format;
> + DualStageIOMMUInfo uinfo;
>
> iommu_type = vfio_get_iommu_type(container, errp);
> if (iommu_type < 0) {
> @@ -1214,7 +1288,16 @@ static int vfio_init_container(VFIOContainer
> *container, int group_fd,
> }
>
> if (iommu_type == VFIO_TYPE1_NESTING_IOMMU) {
> - ds_iommu_object_init(&container->dsi_obj, &vfio_ds_iommu_ops);
> + if (vfio_get_nesting_iommu_format(container, &format)) {
> + error_setg_errno(errp, errno,
> + "Failed to get nesting iommu format");
> + return -errno;
Same here, you might want to return the retcode from
vfio_get_nesting_iommu_format()?
> + }
> +
> + uinfo.pasid_format = format;
> + ds_iommu_object_init(&container->dsi_obj,
> + &vfio_ds_iommu_ops, &uinfo);
> +
> if (iommu_context_register_ds_iommu(container->iommu_ctx,
> &container->dsi_obj)) {
> /*
> diff --git a/include/hw/iommu/dual_stage_iommu.h
> b/include/hw/iommu/dual_stage_iommu.h
> index e9891e3..c6100b4 100644
> --- a/include/hw/iommu/dual_stage_iommu.h
> +++ b/include/hw/iommu/dual_stage_iommu.h
> @@ -23,12 +23,14 @@
> #define HW_DS_IOMMU_H
>
> #include "qemu/queue.h"
> +#include <linux/iommu.h>
> #ifndef CONFIG_USER_ONLY
> #include "exec/hwaddr.h"
> #endif
>
> typedef struct DualStageIOMMUObject DualStageIOMMUObject;
> typedef struct DualStageIOMMUOps DualStageIOMMUOps;
> +typedef struct DualStageIOMMUInfo DualStageIOMMUInfo;
>
> struct DualStageIOMMUOps {
> /* Allocate pasid from DualStageIOMMU (a.k.a. host IOMMU) */
> @@ -41,11 +43,16 @@ struct DualStageIOMMUOps {
> uint32_t pasid);
> };
>
> +struct DualStageIOMMUInfo {
> + uint32_t pasid_format;
> +};
> +
> /*
> * This is an abstraction of Dual-stage IOMMU.
> */
> struct DualStageIOMMUObject {
> DualStageIOMMUOps *ops;
> + DualStageIOMMUInfo uinfo;
> };
>
> int ds_iommu_pasid_alloc(DualStageIOMMUObject *dsi_obj, uint32_t min,
> @@ -53,7 +60,8 @@ int ds_iommu_pasid_alloc(DualStageIOMMUObject *dsi_obj,
> uint32_t min,
> int ds_iommu_pasid_free(DualStageIOMMUObject *dsi_obj, uint32_t pasid);
>
> void ds_iommu_object_init(DualStageIOMMUObject *dsi_obj,
> - DualStageIOMMUOps *ops);
> + DualStageIOMMUOps *ops,
> + DualStageIOMMUInfo *uinfo);
> void ds_iommu_object_destroy(DualStageIOMMUObject *dsi_obj);
>
> #endif
> --
> 2.7.4
>
--
Peter Xu
- Re: [RFC v3 11/25] vfio: get stage-1 pasid formats from Kernel,
Peter Xu <=