[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.15] AMD/IOMMU: don't leave page table mapped when unmapping ...
commit 96894c14ca582b2d6ef50428ef3a24a89104faab Author: Jan Beulich <jbeulich@xxxxxxxx> AuthorDate: Wed Aug 25 14:50:57 2021 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Wed Aug 25 14:50:57 2021 +0200 AMD/IOMMU: don't leave page table mapped when unmapping ... ... an already not mapped page. With all other exit paths doing the unmap, I have no idea how I managed to miss that aspect at the time. Fixes: ad591454f069 ("AMD/IOMMU: don't needlessly trigger errors/crashes when unmapping a page") Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Paul Durrant <paul@xxxxxxx> master commit: 3cfec6a6aa7a7bf68f8e19e21f450c2febe9acb4 master date: 2021-08-20 12:30:35 +0200 --- xen/drivers/passthrough/amd/iommu_map.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/xen/drivers/passthrough/amd/iommu_map.c b/xen/drivers/passthrough/amd/iommu_map.c index 2e7916b1e6..fdfffe8f92 100644 --- a/xen/drivers/passthrough/amd/iommu_map.c +++ b/xen/drivers/passthrough/amd/iommu_map.c @@ -243,7 +243,10 @@ static int iommu_pde_from_dfn(struct domain *d, unsigned long dfn, else if ( !pde->pr ) { if ( !map ) + { + unmap_domain_page(next_table_vaddr); return 0; + } if ( next_table_mfn == 0 ) { -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.15
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