drm/xe/mmio_gem: forbid VMA split

Browse source

The fault handler assumes it always operates on a VMA spanning the entire
GEM object. This does not hold when the VMA has been split, e.g. by a
partial munmap or mprotect. In that case the handler may map wrong
physical pages or cause SIGBUS.

Handle this by forbidding VMA split, as partial unmaps are not deemed
useful for MMIO GEMs.

Suggested-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Ilia Levi <ilia.levi@intel.com>
Fixes: 1ffcf8b8ae ("drm/xe: Support for mmap-ing mmio regions")
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20260908165046.1393557-11-matthew.auld@intel.com
(cherry picked from commit f3391a0b12)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

...

This commit is contained in:

Ilia Levi 2026-09-08 17:50:48 +01:00 • committed by Rodrigo Vivi

parent fd73f4a665

commit 247a82da6f

No known key found for this signature in database

GPG key ID: FA625F640EEB13CA

1 changed files with 10 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

10

drivers/gpu/drm/xe/xe_mmio_gem.c

View file