6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Gunthorpe <jgg@xxxxxxxxxx> [ Upstream commit 1ed2d21d471caf2e4351c2e8bb14143bc8062092 ] Looks like many refactorings here have left this confused. There is only one storage of the root/mode, it is in the iop struct. increase_address_space() calls amd_iommu_domain_set_pgtable() with values that it already stored in iop a few lines above. amd_iommu_domain_clr_pt_root() is zero'ing memory we are about to free. It used to protect against a double free of root, but that is gone now. Remove amd_iommu_domain_set_pgtable(), amd_iommu_domain_set_pt_root(), amd_iommu_domain_clr_pt_root() as they are all pointless. Reviewed-by: Vasant Hegde <vasant.hegde@xxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Link: https://lore.kernel.org/r/5-v2-831cdc4d00f3+1a315-amd_iopgtbl_jgg@xxxxxxxxxx Signed-off-by: Joerg Roedel <jroedel@xxxxxxx> Stable-dep-of: 016991606aa0 ("iommu/amd/pgtbl_v2: Take protection domain lock before invalidating TLB") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/iommu/amd/amd_iommu.h | 13 ------------- drivers/iommu/amd/io_pgtable.c | 24 ------------------------ 2 files changed, 37 deletions(-) diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h index 2d5945c982bde..5a050080d2e81 100644 --- a/drivers/iommu/amd/amd_iommu.h +++ b/drivers/iommu/amd/amd_iommu.h @@ -143,19 +143,6 @@ static inline void *iommu_phys_to_virt(unsigned long paddr) return phys_to_virt(__sme_clr(paddr)); } -static inline -void amd_iommu_domain_set_pt_root(struct protection_domain *domain, u64 root) -{ - domain->iop.root = (u64 *)(root & PAGE_MASK); - domain->iop.mode = root & 7; /* lowest 3 bits encode pgtable mode */ -} - -static inline -void amd_iommu_domain_clr_pt_root(struct protection_domain *domain) -{ - amd_iommu_domain_set_pt_root(domain, 0); -} - static inline int get_pci_sbdf_id(struct pci_dev *pdev) { int seg = pci_domain_nr(pdev->bus); diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c index b3991ad1ae8ea..5278ba3f676c4 100644 --- a/drivers/iommu/amd/io_pgtable.c +++ b/drivers/iommu/amd/io_pgtable.c @@ -132,18 +132,6 @@ static void free_sub_pt(u64 *root, int mode, struct list_head *freelist) } } -void amd_iommu_domain_set_pgtable(struct protection_domain *domain, - u64 *root, int mode) -{ - u64 pt_root; - - /* lowest 3 bits encode pgtable mode */ - pt_root = mode & 7; - pt_root |= (u64)root; - - amd_iommu_domain_set_pt_root(domain, pt_root); -} - /* * This function is used to add another level to an IO page table. Adding * another level increases the size of the address space by 9 bits to a size up @@ -177,12 +165,6 @@ static bool increase_address_space(struct protection_domain *domain, amd_iommu_update_and_flush_device_table(domain); amd_iommu_domain_flush_complete(domain); - /* - * Device Table needs to be updated and flushed before the new root can - * be published. - */ - amd_iommu_domain_set_pgtable(domain, pte, domain->iop.mode); - pte = NULL; ret = true; @@ -561,23 +543,17 @@ static int iommu_v1_read_and_clear_dirty(struct io_pgtable_ops *ops, static void v1_free_pgtable(struct io_pgtable *iop) { struct amd_io_pgtable *pgtable = container_of(iop, struct amd_io_pgtable, iop); - struct protection_domain *dom; LIST_HEAD(freelist); if (pgtable->mode == PAGE_MODE_NONE) return; - dom = container_of(pgtable, struct protection_domain, iop); - /* Page-table is not visible to IOMMU anymore, so free it */ BUG_ON(pgtable->mode < PAGE_MODE_NONE || pgtable->mode > PAGE_MODE_6_LEVEL); free_sub_pt(pgtable->root, pgtable->mode, &freelist); iommu_put_pages_list(&freelist); - - /* Update data structure */ - amd_iommu_domain_clr_pt_root(dom); } static struct io_pgtable *v1_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie) -- 2.43.0
