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| author | Jason Andryuk <jason.andryuk@amd.com> | 2026-08-25 17:48:02 -0400 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2026-08-30 18:25:42 -0700 |
| commit | 72bd92bd8190d7869ecb462649ca40f297822a33 (patch) | |
| tree | d43860c8e8b69faa37a75d3ea6e2668f2cb4f8dc /tools/lib/python/kdoc/python_version.py | |
| parent | cee9395acd8043be0644b25c34bfa86623f2b935 (diff) | |
x86/amd_node: Avoid divide by zero on virtualized systems
On a virtualized system, the number of nodes does not have a relationship to
the number of roots. A Xen PVH dom0 can calculate roots_per_node as 0, which
crashes with a divide by zero in:
if (count++ % roots_per_node)
because the underlying topology code on Xen ends up making num_nodes
2 and num_roots 1 and the integer division result is 0.
The issue is seen with Xen, but it could affect other systems.
Set roots_per_node to 1 in this case. Print a firmware bug when this is
performed for non-virtualized systems.
[ bp: Massage commit message. ]
Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching")
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260825214805.39148-2-jason.andryuk@amd.com
Diffstat (limited to 'tools/lib/python/kdoc/python_version.py')
0 files changed, 0 insertions, 0 deletions