This is a note to let you know that I've just added the patch titled iommu/amd: Set page size bitmap during V2 domain allocation to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iommu-amd-set-page-size-bitmap-during-v2-domain-allo.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit adbd6c5b4c0c9d437923357c0e070db87f55099e Author: Jerry Snitselaar <jsnitsel@xxxxxxxxxx> Date: Tue Apr 4 00:27:42 2023 -0700 iommu/amd: Set page size bitmap during V2 domain allocation [ Upstream commit 8f880d19e6ad645a4b8066d5ff091c980b3231e7 ] With the addition of the V2 page table support, the domain page size bitmap needs to be set prior to iommu core setting up direct mappings for reserved regions. When reserved regions are mapped, if this is not done, it will be looking at the V1 page size bitmap when determining the page size to use in iommu_pgsize(). When it gets into the actual amd mapping code, a check of see if the page size is supported can fail, because at that point it is checking it against the V2 page size bitmap which only supports 4K, 2M, and 1G. Add a check to __iommu_domain_alloc() to not override the bitmap if it was already set by the iommu ops domain_alloc() code path. Cc: Vasant Hegde <vasant.hegde@xxxxxxx> Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> Cc: Robin Murphy <robin.murphy@xxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Joerg Roedel <joro@xxxxxxxxxx> Fixes: 4db6c41f0946 ("iommu/amd: Add support for using AMD IOMMU v2 page table for DMA-API") Signed-off-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx> Reviewed-by: Vasant Hegde <vasant.hegde@xxxxxxx> Link: https://lore.kernel.org/r/20230404072742.1895252-1-jsnitsel@xxxxxxxxxx Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 20adb9b323d82..26fb78003889f 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -1657,10 +1657,6 @@ static void do_attach(struct iommu_dev_data *dev_data, domain->dev_iommu[iommu->index] += 1; domain->dev_cnt += 1; - /* Override supported page sizes */ - if (domain->flags & PD_GIOV_MASK) - domain->domain.pgsize_bitmap = AMD_IOMMU_PGSIZES_V2; - /* Update device table */ set_dte_entry(iommu, dev_data->devid, domain, ats, dev_data->iommu_v2); @@ -2039,6 +2035,8 @@ static int protection_domain_init_v2(struct protection_domain *domain) domain->flags |= PD_GIOV_MASK; + domain->domain.pgsize_bitmap = AMD_IOMMU_PGSIZES_V2; + if (domain_enable_v2(domain, 1)) { domain_id_free(domain->id); return -ENOMEM; diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index bfb2f163c6914..2bcd1f23d07d2 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1912,8 +1912,13 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, return NULL; domain->type = type; - /* Assume all sizes by default; the driver may override this later */ - domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; + /* + * If not already set, assume all sizes by default; the driver + * may override this later + */ + if (!domain->pgsize_bitmap) + domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; + if (!domain->ops) domain->ops = bus->iommu_ops->default_domain_ops;