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s390/cmma: fix handling of swapper_pg_dir and invalid_pg_dir
[ 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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1 changed files with 6 additions and 0 deletions
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@ -181,6 +181,12 @@ void __init cmma_init_nodat(void)
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return;
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/* Mark pages used in kernel page tables */
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mark_kernel_pgd();
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page = virt_to_page(&swapper_pg_dir);
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for (i = 0; i < 4; i++)
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set_bit(PG_arch_1, &page[i].flags);
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page = virt_to_page(&invalid_pg_dir);
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for (i = 0; i < 4; i++)
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set_bit(PG_arch_1, &page[i].flags);
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/* Set all kernel pages not used for page tables to stable/no-dat */
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for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
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