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Date: Sat, 27 Nov 2021 18:09:40 +0100
From: Eric Auger <eric.auger@...hat.com>
To: Jean-Philippe Brucker <jean-philippe@...aro.org>, joro@...tes.org,
will@...nel.org, mst@...hat.com, jasowang@...hat.com
Cc: virtualization@...ts.linux-foundation.org,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
sebastien.boeuf@...el.com, kevin.tian@...el.com,
pasic@...ux.ibm.com
Subject: Re: [PATCH v2 4/5] iommu/virtio: Pass end address to
viommu_add_mapping()
On 11/23/21 4:53 PM, Jean-Philippe Brucker wrote:
> To support identity mappings, the virtio-iommu driver must be able to
> represent full 64-bit ranges internally. Pass (start, end) instead of
> (start, size) to viommu_add/del_mapping().
>
> Clean comments. The one about the returned size was never true: when
> sweeping the whole address space the returned size will most certainly
> be smaller than 2^64.
>
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
Reviewed-by: Eric Auger <eric.auger@...hat.com>
Eric
> ---
> drivers/iommu/virtio-iommu.c | 31 +++++++++++++++----------------
> 1 file changed, 15 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index d63ec4d11b00..eceb9281c8c1 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -311,8 +311,8 @@ static int viommu_send_req_sync(struct viommu_dev *viommu, void *buf,
> *
> * On success, return the new mapping. Otherwise return NULL.
> */
> -static int viommu_add_mapping(struct viommu_domain *vdomain, unsigned long iova,
> - phys_addr_t paddr, size_t size, u32 flags)
> +static int viommu_add_mapping(struct viommu_domain *vdomain, u64 iova, u64 end,
> + phys_addr_t paddr, u32 flags)
> {
> unsigned long irqflags;
> struct viommu_mapping *mapping;
> @@ -323,7 +323,7 @@ static int viommu_add_mapping(struct viommu_domain *vdomain, unsigned long iova,
>
> mapping->paddr = paddr;
> mapping->iova.start = iova;
> - mapping->iova.last = iova + size - 1;
> + mapping->iova.last = end;
> mapping->flags = flags;
>
> spin_lock_irqsave(&vdomain->mappings_lock, irqflags);
> @@ -338,26 +338,24 @@ static int viommu_add_mapping(struct viommu_domain *vdomain, unsigned long iova,
> *
> * @vdomain: the domain
> * @iova: start of the range
> - * @size: size of the range. A size of 0 corresponds to the entire address
> - * space.
> + * @end: end of the range
> *
> - * On success, returns the number of unmapped bytes (>= size)
> + * On success, returns the number of unmapped bytes
> */
> static size_t viommu_del_mappings(struct viommu_domain *vdomain,
> - unsigned long iova, size_t size)
> + u64 iova, u64 end)
> {
> size_t unmapped = 0;
> unsigned long flags;
> - unsigned long last = iova + size - 1;
> struct viommu_mapping *mapping = NULL;
> struct interval_tree_node *node, *next;
>
> spin_lock_irqsave(&vdomain->mappings_lock, flags);
> - next = interval_tree_iter_first(&vdomain->mappings, iova, last);
> + next = interval_tree_iter_first(&vdomain->mappings, iova, end);
> while (next) {
> node = next;
> mapping = container_of(node, struct viommu_mapping, iova);
> - next = interval_tree_iter_next(node, iova, last);
> + next = interval_tree_iter_next(node, iova, end);
>
> /* Trying to split a mapping? */
> if (mapping->iova.start < iova)
> @@ -656,8 +654,8 @@ static void viommu_domain_free(struct iommu_domain *domain)
> {
> struct viommu_domain *vdomain = to_viommu_domain(domain);
>
> - /* Free all remaining mappings (size 2^64) */
> - viommu_del_mappings(vdomain, 0, 0);
> + /* Free all remaining mappings */
> + viommu_del_mappings(vdomain, 0, ULLONG_MAX);
>
> if (vdomain->viommu)
> ida_free(&vdomain->viommu->domain_ids, vdomain->id);
> @@ -742,6 +740,7 @@ static int viommu_map(struct iommu_domain *domain, unsigned long iova,
> {
> int ret;
> u32 flags;
> + u64 end = iova + size - 1;
> struct virtio_iommu_req_map map;
> struct viommu_domain *vdomain = to_viommu_domain(domain);
>
> @@ -752,7 +751,7 @@ static int viommu_map(struct iommu_domain *domain, unsigned long iova,
> if (flags & ~vdomain->map_flags)
> return -EINVAL;
>
> - ret = viommu_add_mapping(vdomain, iova, paddr, size, flags);
> + ret = viommu_add_mapping(vdomain, iova, end, paddr, flags);
> if (ret)
> return ret;
>
> @@ -761,7 +760,7 @@ static int viommu_map(struct iommu_domain *domain, unsigned long iova,
> .domain = cpu_to_le32(vdomain->id),
> .virt_start = cpu_to_le64(iova),
> .phys_start = cpu_to_le64(paddr),
> - .virt_end = cpu_to_le64(iova + size - 1),
> + .virt_end = cpu_to_le64(end),
> .flags = cpu_to_le32(flags),
> };
>
> @@ -770,7 +769,7 @@ static int viommu_map(struct iommu_domain *domain, unsigned long iova,
>
> ret = viommu_send_req_sync(vdomain->viommu, &map, sizeof(map));
> if (ret)
> - viommu_del_mappings(vdomain, iova, size);
> + viommu_del_mappings(vdomain, iova, end);
>
> return ret;
> }
> @@ -783,7 +782,7 @@ static size_t viommu_unmap(struct iommu_domain *domain, unsigned long iova,
> struct virtio_iommu_req_unmap unmap;
> struct viommu_domain *vdomain = to_viommu_domain(domain);
>
> - unmapped = viommu_del_mappings(vdomain, iova, size);
> + unmapped = viommu_del_mappings(vdomain, iova, iova + size - 1);
> if (unmapped < size)
> return 0;
>
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