s390/cmma: fix handling of swapper_pg_dir and invalid_pg_dir

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[ Upstream commit 84bb41d5df ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Heiko Carstens 2023-10-24 10:15:20 +02:00 • committed by Greg Kroah-Hartman

parent 8db5cb33d6

commit 7bfe774146

1 changed files with 6 additions and 0 deletions

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arch/s390/mm/page-states.c

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