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| author | Heiko Carstens <hca@linux.ibm.com> | 2023-10-24 11:15:20 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2023-10-25 16:08:29 +0300 |
| commit | 84bb41d5df48868055d159d9247b80927f1f70f9 (patch) | |
| tree | 03c72792894391e36d4a6031cd76e64b7ec43e26 /security/min_addr.c | |
| parent | 44d93045247661acbd50b1629e62f415f2747577 (diff) | |
| download | linux-84bb41d5df48868055d159d9247b80927f1f70f9.tar.xz | |
s390/cmma: fix handling of swapper_pg_dir and invalid_pg_dir
If the cmma no-dat feature is available the kernel page tables are walked
to identify and mark all pages which are used for address translation (all
region, segment, and page tables). In a subsequent loop all other pages are
marked as "no-dat" pages with the ESSA instruction.
This information is visible to the hypervisor, so that the hypervisor can
optimize purging of guest TLB entries. All pages used for swapper_pg_dir
and invalid_pg_dir are incorrectly marked as no-dat, which in turn can
result in incorrect guest TLB flushes.
Fix this by marking those pages correctly as being used for DAT.
Cc: <stable@vger.kernel.org>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'security/min_addr.c')
0 files changed, 0 insertions, 0 deletions