Re: [PATCH v1 13/22] vfio: add bind stage-1 page table support

Peter Xu
2020-03-24T17:41:32Z

On Sun, Mar 22, 2020 at 05:36:10AM -0700, Liu Yi L wrote:
> This patch adds bind_stage1_pgtbl() definition in HostIOMMUContextClass,
> also adds corresponding implementation in VFIO. This is to expose a way
> for vIOMMU to setup dual stage DMA translation for passthru devices on
> hardware.
>
> Cc: Kevin Tian <kevin.tian@intel.com>
> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
> Cc: Peter Xu <peterx@redhat.com>
> Cc: Eric Auger <eric.auger@redhat.com>
> Cc: Yi Sun <yi.y.sun@linux.intel.com>
> Cc: David Gibson <david@gibson.dropbear.id.au>
> Cc: Alex Williamson <alex.williamson@redhat.com>
> Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> ---
> hw/iommu/host_iommu_context.c | 49 ++++++++++++++++++++++++++++++-
> hw/vfio/common.c | 55 ++++++++++++++++++++++++++++++++++-
> include/hw/iommu/host_iommu_context.h | 26 ++++++++++++++++-
> 3 files changed, 127 insertions(+), 3 deletions(-)
>
> diff --git a/hw/iommu/host_iommu_context.c b/hw/iommu/host_iommu_context.c
> index af61899..8a53376 100644
> --- a/hw/iommu/host_iommu_context.c
> +++ b/hw/iommu/host_iommu_context.c
> @@ -69,21 +69,67 @@ int host_iommu_ctx_pasid_free(HostIOMMUContext *host_icx, uint32_t pasid)
> return hicxc->pasid_free(host_icx, pasid);
> }
>
> +int host_iommu_ctx_bind_stage1_pgtbl(HostIOMMUContext *host_icx,
> + DualIOMMUStage1BindData *data)
> +{
> + HostIOMMUContextClass *hicxc;
> +
> + if (!host_icx) {
> + return -EINVAL;
> + }
> +
> + hicxc = HOST_IOMMU_CONTEXT_GET_CLASS(host_icx);
> + if (!hicxc) {
> + return -EINVAL;
> + }
> +
> + if (!(host_icx->flags & HOST_IOMMU_NESTING) ||
> + !hicxc->bind_stage1_pgtbl) {
> + return -EINVAL;
> + }
> +
> + return hicxc->bind_stage1_pgtbl(host_icx, data);
> +}
> +
> +int host_iommu_ctx_unbind_stage1_pgtbl(HostIOMMUContext *host_icx,
> + DualIOMMUStage1BindData *data)
> +{
> + HostIOMMUContextClass *hicxc;
> +
> + if (!host_icx) {
> + return -EINVAL;
> + }
> +
> + hicxc = HOST_IOMMU_CONTEXT_GET_CLASS(host_icx);
> + if (!hicxc) {
> + return -EINVAL;
> + }
> +
> + if (!(host_icx->flags & HOST_IOMMU_NESTING) ||
> + !hicxc->unbind_stage1_pgtbl) {
> + return -EINVAL;
> + }
> +
> + return hicxc->unbind_stage1_pgtbl(host_icx, data);
> +}
> +
> void host_iommu_ctx_init(void *_host_icx, size_t instance_size,
> const char *mrtypename,
> - uint64_t flags)
> + uint64_t flags, uint32_t formats)
> {
> HostIOMMUContext *host_icx;
>
> object_initialize(_host_icx, instance_size, mrtypename);
> host_icx = HOST_IOMMU_CONTEXT(_host_icx);
> host_icx->flags = flags;
> + host_icx->stage1_formats = formats;
> host_icx->initialized = true;
> }
>
> void host_iommu_ctx_destroy(HostIOMMUContext *host_icx)
> {
> host_icx->flags = 0x0;
> + host_icx->stage1_formats = 0x0;

This could be dropped too with the function..

> host_icx->initialized = false;
> }
>
> @@ -92,6 +138,7 @@ static void host_icx_init_fn(Object *obj)
> HostIOMMUContext *host_icx = HOST_IOMMU_CONTEXT(obj);
>
> host_icx->flags = 0x0;
> + host_icx->stage1_formats = 0x0;

Same here...

> host_icx->initialized = false;
> }
>
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index e0f2828..770a785 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -1223,6 +1223,52 @@ static int vfio_host_icx_pasid_free(HostIOMMUContext *host_icx,
> return 0;
> }
>
> +static int vfio_host_icx_bind_stage1_pgtbl(HostIOMMUContext *host_icx,

Same name issue on icx? Feel free to choose anything that aligns with
your previous decision...

> + DualIOMMUStage1BindData *bind_data)
> +{
> + VFIOContainer *container = container_of(host_icx, VFIOContainer, host_icx);
> + struct vfio_iommu_type1_bind *bind;
> + unsigned long argsz;
> + int ret = 0;
> +
> + argsz = sizeof(*bind) + sizeof(bind_data->bind_data);
> + bind = g_malloc0(argsz);
> + bind->argsz = argsz;
> + bind->flags = VFIO_IOMMU_BIND_GUEST_PGTBL;
> + memcpy(&bind->data, &bind_data->bind_data, sizeof(bind_data->bind_data));
> +
> + if (ioctl(container->fd, VFIO_IOMMU_BIND, bind)) {
> + ret = -errno;
> + error_report("%s: pasid (%u) bind failed: %d",
> + __func__, bind_data->pasid, ret);
> + }
> + g_free(bind);
> + return ret;
> +}
> +
> +static int vfio_host_icx_unbind_stage1_pgtbl(HostIOMMUContext *host_icx,
> + DualIOMMUStage1BindData *bind_data)
> +{
> + VFIOContainer *container = container_of(host_icx, VFIOContainer, host_icx);
> + struct vfio_iommu_type1_bind *bind;
> + unsigned long argsz;
> + int ret = 0;
> +
> + argsz = sizeof(*bind) + sizeof(bind_data->bind_data);
> + bind = g_malloc0(argsz);
> + bind->argsz = argsz;
> + bind->flags = VFIO_IOMMU_UNBIND_GUEST_PGTBL;
> + memcpy(&bind->data, &bind_data->bind_data, sizeof(bind_data->bind_data));
> +
> + if (ioctl(container->fd, VFIO_IOMMU_BIND, bind)) {
> + ret = -errno;
> + error_report("%s: pasid (%u) unbind failed: %d",
> + __func__, bind_data->pasid, ret);
> + }
> + g_free(bind);
> + return ret;
> +}
> +
> /**
> * Get iommu info from host. Caller of this funcion should free
> * the memory pointed by the returned pointer stored in @info
> @@ -1337,6 +1383,7 @@ static int vfio_init_container(VFIOContainer *container, int group_fd,
> struct vfio_iommu_type1_info_cap_nesting nesting = {
> .nesting_capabilities = 0x0,
> .stage1_formats = 0, };
> + uint32_t stage1_formats;
>
> ret = vfio_get_nesting_iommu_cap(container, &nesting);
> if (ret) {
> @@ -1347,10 +1394,14 @@ static int vfio_init_container(VFIOContainer *container, int group_fd,
>
> flags |= (nesting.nesting_capabilities & VFIO_IOMMU_PASID_REQS) ?
> HOST_IOMMU_PASID_REQUEST : 0;
> + flags |= HOST_IOMMU_NESTING;
> + stage1_formats = nesting.stage1_formats;
> +
> host_iommu_ctx_init(&container->host_icx,
> sizeof(container->host_icx),
> TYPE_VFIO_HOST_IOMMU_CONTEXT,
> - flags);
> + flags,
> + stage1_formats);

We can consider passing in nesting.stage1_formats and drop
stage1_formats.

> }
>
> container->iommu_type = iommu_type;
> @@ -1943,6 +1994,8 @@ static void vfio_host_iommu_context_class_init(ObjectClass *klass,
>
> hicxc->pasid_alloc = vfio_host_icx_pasid_alloc;
> hicxc->pasid_free = vfio_host_icx_pasid_free;
> + hicxc->bind_stage1_pgtbl = vfio_host_icx_bind_stage1_pgtbl;
> + hicxc->unbind_stage1_pgtbl = vfio_host_icx_unbind_stage1_pgtbl;
> }
>
> static const TypeInfo vfio_host_iommu_context_info = {
> diff --git a/include/hw/iommu/host_iommu_context.h b/include/hw/iommu/host_iommu_context.h
> index 5f11a4c..97c9473 100644
> --- a/include/hw/iommu/host_iommu_context.h
> +++ b/include/hw/iommu/host_iommu_context.h
> @@ -41,6 +41,7 @@
> TYPE_HOST_IOMMU_CONTEXT)
>
> typedef struct HostIOMMUContext HostIOMMUContext;
> +typedef struct DualIOMMUStage1BindData DualIOMMUStage1BindData;
>
> typedef struct HostIOMMUContextClass {
> /* private */
> @@ -54,6 +55,16 @@ typedef struct HostIOMMUContextClass {
> /* Reclaim pasid from HostIOMMUContext (a.k.a. host software) */
> int (*pasid_free)(HostIOMMUContext *host_icx,
> uint32_t pasid);
> + /*
> + * Bind stage-1 page table to a hostIOMMU w/ dual stage
> + * DMA translation capability.
> + * @bind_data specifies the bind configurations.
> + */
> + int (*bind_stage1_pgtbl)(HostIOMMUContext *dsi_obj,
> + DualIOMMUStage1BindData *bind_data);
> + /* Undo a previous bind. @bind_data specifies the unbind info. */
> + int (*unbind_stage1_pgtbl)(HostIOMMUContext *dsi_obj,
> + DualIOMMUStage1BindData *bind_data);
> } HostIOMMUContextClass;
>
> /*
> @@ -62,17 +73,30 @@ typedef struct HostIOMMUContextClass {
> struct HostIOMMUContext {
> Object parent_obj;
> #define HOST_IOMMU_PASID_REQUEST (1ULL << 0)
> +#define HOST_IOMMU_NESTING (1ULL << 1)
> uint64_t flags;
> + uint32_t stage1_formats;
> bool initialized;
> };
>
> +struct DualIOMMUStage1BindData {
> + uint32_t pasid;
> + union {
> + struct iommu_gpasid_bind_data gpasid_bind;
> + } bind_data;
> +};
> +
> int host_iommu_ctx_pasid_alloc(HostIOMMUContext *host_icx, uint32_t min,
> uint32_t max, uint32_t *pasid);
> int host_iommu_ctx_pasid_free(HostIOMMUContext *host_icx, uint32_t pasid);
> +int host_iommu_ctx_bind_stage1_pgtbl(HostIOMMUContext *host_icx,
> + DualIOMMUStage1BindData *data);
> +int host_iommu_ctx_unbind_stage1_pgtbl(HostIOMMUContext *host_icx,
> + DualIOMMUStage1BindData *data);
>
> void host_iommu_ctx_init(void *_host_icx, size_t instance_size,
> const char *mrtypename,
> - uint64_t flags);
> + uint64_t flags, uint32_t formats);
> void host_iommu_ctx_destroy(HostIOMMUContext *host_icx);
>
> #endif
> --
> 2.7.4
>

--
Peter Xu