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| author | Heiko Carstens <hca@linux.ibm.com> | 2023-10-24 10:15:20 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2023-10-25 15:08:29 +0200 |
| commit | 84bb41d5df48868055d159d9247b80927f1f70f9 (patch) | |
| tree | 03c72792894391e36d4a6031cd76e64b7ec43e26 /arch/s390/mm | |
| parent | 44d93045247661acbd50b1629e62f415f2747577 (diff) | |
| download | linux-stable-84bb41d5df48868055d159d9247b80927f1f70f9.tar.gz linux-stable-84bb41d5df48868055d159d9247b80927f1f70f9.tar.bz2 linux-stable-84bb41d5df48868055d159d9247b80927f1f70f9.zip | |
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 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/page-states.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c index 20c0b160efee..a31acb2c4ef2 100644 --- a/arch/s390/mm/page-states.c +++ b/arch/s390/mm/page-states.c @@ -188,6 +188,12 @@ void __init cmma_init_nodat(void) return; /* Mark pages used in kernel page tables */ mark_kernel_pgd(); + page = virt_to_page(&swapper_pg_dir); + for (i = 0; i < 4; i++) + set_bit(PG_arch_1, &page[i].flags); + page = virt_to_page(&invalid_pg_dir); + for (i = 0; i < 4; i++) + set_bit(PG_arch_1, &page[i].flags); /* Set all kernel pages not used for page tables to stable/no-dat */ for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) { |