From: Suravee Suthikulpanit Date: Thu, 10 Feb 2022 09:47:45 -0600 Subject: iommu/amd: Fix I/O page table memory leak Git-commit: 6b0b2d9a6a308bcd9300c2d83000a82812c56cea Patch-mainline: v5.17-rc7 References: git-fixes The current logic updates the I/O page table mode for the domain before calling the logic to free memory used for the page table. This results in IOMMU page table memory leak, and can be observed when launching VM w/ pass-through devices. Fix by freeing the memory used for page table before updating the mode. Cc: Joerg Roedel Reported-by: Daniel Jordan Tested-by: Daniel Jordan Signed-off-by: Suravee Suthikulpanit Fixes: e42ba0633064 ("iommu/amd: Restructure code for freeing page table") Link: https://lore.kernel.org/all/20220118194720.urjgi73b7c3tq2o6@oracle.com/ Link: https://lore.kernel.org/r/20220210154745.11524-1-suravee.suthikulpanit@amd.com Signed-off-by: Joerg Roedel --- drivers/iommu/amd/io_pgtable.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/drivers/iommu/amd/io_pgtable.c +++ b/drivers/iommu/amd/io_pgtable.c @@ -519,12 +519,6 @@ static void v1_free_pgtable(struct io_pg dom = container_of(pgtable, struct protection_domain, iop); - /* Update data structure */ - amd_iommu_domain_clr_pt_root(dom); - - /* Make changes visible to IOMMUs */ - amd_iommu_domain_update(dom); - /* Page-table is not visible to IOMMU anymore, so free it */ BUG_ON(pgtable->mode < PAGE_MODE_NONE || pgtable->mode > PAGE_MODE_6_LEVEL); @@ -532,6 +526,12 @@ static void v1_free_pgtable(struct io_pg root = (unsigned long)pgtable->root; freelist = free_sub_pt(root, pgtable->mode, freelist); + /* Update data structure */ + amd_iommu_domain_clr_pt_root(dom); + + /* Make changes visible to IOMMUs */ + amd_iommu_domain_update(dom); + free_page_list(freelist); }