From: Heiko Carstens Date: Tue, 24 Oct 2023 08:15:20 +0000 (+0200) Subject: s390/cmma: fix handling of swapper_pg_dir and invalid_pg_dir X-Git-Tag: v6.6.17~2288 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7bfe7741468c47309ff2876e9ef4aff86f40ada1;p=platform%2Fkernel%2Flinux-rpi.git s390/cmma: fix handling of swapper_pg_dir and invalid_pg_dir [ Upstream commit 84bb41d5df48868055d159d9247b80927f1f70f9 ] 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: Reviewed-by: Claudio Imbrenda Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin --- diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c index 00e7b08..79a037f 100644 --- a/arch/s390/mm/page-states.c +++ b/arch/s390/mm/page-states.c @@ -181,6 +181,12 @@ 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) {