Following specification review a few things were changed in v8 of the virtio-iommu series [1], but have been omitted when merging the base driver. Add them now: * Remove the EXEC flag. * Add feature bit for the MMIO flag. * Change domain_bits to domain_range. * Add NOMEM status flag. [1] https://lore.kernel.org/linux-iommu/20190530170929.19366-1-jean-philippe.brucker@xxxxxxx/ Fixes: edcd69ab9a32 ("iommu: Add virtio-iommu driver") Reported-by: Eric Auger <eric.auger@xxxxxxxxxx> Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> --- drivers/iommu/virtio-iommu.c | 40 ++++++++++++++++++++++--------- include/uapi/linux/virtio_iommu.h | 32 ++++++++++++++----------- 2 files changed, 47 insertions(+), 25 deletions(-) diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c index 433f4d2ee956..80a740df0737 100644 --- a/drivers/iommu/virtio-iommu.c +++ b/drivers/iommu/virtio-iommu.c @@ -2,7 +2,7 @@ /* * Virtio driver for the paravirtualized IOMMU * - * Copyright (C) 2018 Arm Limited + * Copyright (C) 2019 Arm Limited */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt @@ -47,7 +47,10 @@ struct viommu_dev { /* Device configuration */ struct iommu_domain_geometry geometry; u64 pgsize_bitmap; - u8 domain_bits; + u32 first_domain; + u32 last_domain; + /* Supported MAP flags */ + u32 map_flags; u32 probe_size; }; @@ -62,6 +65,7 @@ struct viommu_domain { struct viommu_dev *viommu; struct mutex mutex; /* protects viommu pointer */ unsigned int id; + u32 map_flags; spinlock_t mappings_lock; struct rb_root_cached mappings; @@ -113,6 +117,8 @@ static int viommu_get_req_errno(void *buf, size_t len) return -ENOENT; case VIRTIO_IOMMU_S_FAULT: return -EFAULT; + case VIRTIO_IOMMU_S_NOMEM: + return -ENOMEM; case VIRTIO_IOMMU_S_IOERR: case VIRTIO_IOMMU_S_DEVERR: default: @@ -607,15 +613,15 @@ static int viommu_domain_finalise(struct viommu_dev *viommu, { int ret; struct viommu_domain *vdomain = to_viommu_domain(domain); - unsigned int max_domain = viommu->domain_bits > 31 ? ~0 : - (1U << viommu->domain_bits) - 1; vdomain->viommu = viommu; + vdomain->map_flags = viommu->map_flags; domain->pgsize_bitmap = viommu->pgsize_bitmap; domain->geometry = viommu->geometry; - ret = ida_alloc_max(&viommu->domain_ids, max_domain, GFP_KERNEL); + ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain, + viommu->last_domain, GFP_KERNEL); if (ret >= 0) vdomain->id = (unsigned int)ret; @@ -710,7 +716,7 @@ static int viommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot) { int ret; - int flags; + u32 flags; struct virtio_iommu_req_map map; struct viommu_domain *vdomain = to_viommu_domain(domain); @@ -718,6 +724,9 @@ static int viommu_map(struct iommu_domain *domain, unsigned long iova, (prot & IOMMU_WRITE ? VIRTIO_IOMMU_MAP_F_WRITE : 0) | (prot & IOMMU_MMIO ? VIRTIO_IOMMU_MAP_F_MMIO : 0); + if (flags & ~vdomain->map_flags) + return -EINVAL; + ret = viommu_add_mapping(vdomain, iova, paddr, size, flags); if (ret) return ret; @@ -1027,7 +1036,8 @@ static int viommu_probe(struct virtio_device *vdev) goto err_free_vqs; } - viommu->domain_bits = 32; + viommu->map_flags = VIRTIO_IOMMU_MAP_F_READ | VIRTIO_IOMMU_MAP_F_WRITE; + viommu->last_domain = ~0U; /* Optional features */ virtio_cread_feature(vdev, VIRTIO_IOMMU_F_INPUT_RANGE, @@ -1038,9 +1048,13 @@ static int viommu_probe(struct virtio_device *vdev) struct virtio_iommu_config, input_range.end, &input_end); - virtio_cread_feature(vdev, VIRTIO_IOMMU_F_DOMAIN_BITS, - struct virtio_iommu_config, domain_bits, - &viommu->domain_bits); + virtio_cread_feature(vdev, VIRTIO_IOMMU_F_DOMAIN_RANGE, + struct virtio_iommu_config, domain_range.start, + &viommu->first_domain); + + virtio_cread_feature(vdev, VIRTIO_IOMMU_F_DOMAIN_RANGE, + struct virtio_iommu_config, domain_range.end, + &viommu->last_domain); virtio_cread_feature(vdev, VIRTIO_IOMMU_F_PROBE, struct virtio_iommu_config, probe_size, @@ -1052,6 +1066,9 @@ static int viommu_probe(struct virtio_device *vdev) .force_aperture = true, }; + if (virtio_has_feature(vdev, VIRTIO_IOMMU_F_MMIO)) + viommu->map_flags |= VIRTIO_IOMMU_MAP_F_MMIO; + viommu_ops.pgsize_bitmap = viommu->pgsize_bitmap; virtio_device_ready(vdev); @@ -1130,9 +1147,10 @@ static void viommu_config_changed(struct virtio_device *vdev) static unsigned int features[] = { VIRTIO_IOMMU_F_MAP_UNMAP, - VIRTIO_IOMMU_F_DOMAIN_BITS, VIRTIO_IOMMU_F_INPUT_RANGE, + VIRTIO_IOMMU_F_DOMAIN_RANGE, VIRTIO_IOMMU_F_PROBE, + VIRTIO_IOMMU_F_MMIO, }; static struct virtio_device_id id_table[] = { diff --git a/include/uapi/linux/virtio_iommu.h b/include/uapi/linux/virtio_iommu.h index ba1b460c9944..237e36a280cb 100644 --- a/include/uapi/linux/virtio_iommu.h +++ b/include/uapi/linux/virtio_iommu.h @@ -1,8 +1,8 @@ /* SPDX-License-Identifier: BSD-3-Clause */ /* - * Virtio-iommu definition v0.9 + * Virtio-iommu definition v0.12 * - * Copyright (C) 2018 Arm Ltd. + * Copyright (C) 2019 Arm Ltd. */ #ifndef _UAPI_LINUX_VIRTIO_IOMMU_H #define _UAPI_LINUX_VIRTIO_IOMMU_H @@ -11,26 +11,31 @@ /* Feature bits */ #define VIRTIO_IOMMU_F_INPUT_RANGE 0 -#define VIRTIO_IOMMU_F_DOMAIN_BITS 1 +#define VIRTIO_IOMMU_F_DOMAIN_RANGE 1 #define VIRTIO_IOMMU_F_MAP_UNMAP 2 #define VIRTIO_IOMMU_F_BYPASS 3 #define VIRTIO_IOMMU_F_PROBE 4 +#define VIRTIO_IOMMU_F_MMIO 5 -struct virtio_iommu_range { - __u64 start; - __u64 end; +struct virtio_iommu_range_64 { + __le64 start; + __le64 end; +}; + +struct virtio_iommu_range_32 { + __le32 start; + __le32 end; }; struct virtio_iommu_config { /* Supported page sizes */ - __u64 page_size_mask; + __le64 page_size_mask; /* Supported IOVA range */ - struct virtio_iommu_range input_range; + struct virtio_iommu_range_64 input_range; /* Max domain ID size */ - __u8 domain_bits; - __u8 padding[3]; + struct virtio_iommu_range_32 domain_range; /* Probe buffer size */ - __u32 probe_size; + __le32 probe_size; }; /* Request types */ @@ -49,6 +54,7 @@ struct virtio_iommu_config { #define VIRTIO_IOMMU_S_RANGE 0x05 #define VIRTIO_IOMMU_S_NOENT 0x06 #define VIRTIO_IOMMU_S_FAULT 0x07 +#define VIRTIO_IOMMU_S_NOMEM 0x08 struct virtio_iommu_req_head { __u8 type; @@ -78,12 +84,10 @@ struct virtio_iommu_req_detach { #define VIRTIO_IOMMU_MAP_F_READ (1 << 0) #define VIRTIO_IOMMU_MAP_F_WRITE (1 << 1) -#define VIRTIO_IOMMU_MAP_F_EXEC (1 << 2) -#define VIRTIO_IOMMU_MAP_F_MMIO (1 << 3) +#define VIRTIO_IOMMU_MAP_F_MMIO (1 << 2) #define VIRTIO_IOMMU_MAP_F_MASK (VIRTIO_IOMMU_MAP_F_READ | \ VIRTIO_IOMMU_MAP_F_WRITE | \ - VIRTIO_IOMMU_MAP_F_EXEC | \ VIRTIO_IOMMU_MAP_F_MMIO) struct virtio_iommu_req_map { -- 2.22.0 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
