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iommu/amd: Fix I/O page table memory leak

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[ Upstream commit 6b0b2d9a6a ]

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 <joro@8bytes.org>
Reported-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Tested-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Fixes: e42ba06330 ("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 <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Suravee Suthikulpanit 2022-02-10 09:47:45 -06:00 committed by Greg Kroah-Hartman
parent f6cabb721c
commit 378e2fe1eb
1 changed files with 6 additions and 6 deletions
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12
drivers/iommu/amd/io_pgtable.c
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@ -519,12 +519,6 @@ static void v1_free_pgtable(struct io_pgtable *iop)
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_pgtable *iop)
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);
}