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xen.23271
611f844b-AMD-IOMMU-dont-leave-pt-mapped.patch
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File 611f844b-AMD-IOMMU-dont-leave-pt-mapped.patch of Package xen.23271
# Commit 3cfec6a6aa7a7bf68f8e19e21f450c2febe9acb4 # Date 2021-08-20 12:30:35 +0200 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> 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@suse.com> Reviewed-by: Paul Durrant <paul@xen.org> --- a/xen/drivers/passthrough/amd/iommu_map.c +++ b/xen/drivers/passthrough/amd/iommu_map.c @@ -442,7 +442,10 @@ static int iommu_pde_from_dfn(struct dom else if ( !iommu_is_pte_present((uint32_t *)pde) ) { if ( !map ) + { + unmap_domain_page(next_table_vaddr); return 0; + } if ( next_table_mfn == 0 ) {
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