4.14-stable review patch. If anyone has any objections, please let me know.
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From: Heiko Carstens hca@linux.ibm.com
commit 16ba44826a04834d3eeeda4b731c2ea3481062b7 upstream.
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. The initial loop however does not cover the complete kernel address space. This can result in pages being marked as not being used for dynamic address translation, even though they are. In turn guest TLB entries incorrectly may not be purged.
Fix this by adjusting the end address of the kernel address range being walked.
Cc: stable@vger.kernel.org Reviewed-by: Claudio Imbrenda imbrenda@linux.ibm.com Reviewed-by: Alexander Gordeev agordeev@linux.ibm.com Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Vasily Gorbik gor@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/mm/page-states.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
--- a/arch/s390/mm/page-states.c +++ b/arch/s390/mm/page-states.c @@ -167,15 +167,22 @@ static void mark_kernel_p4d(pgd_t *pgd,
static void mark_kernel_pgd(void) { - unsigned long addr, next; + unsigned long addr, next, max_addr; struct page *page; pgd_t *pgd; int i;
addr = 0; + /* + * Figure out maximum virtual address accessible with the + * kernel ASCE. This is required to keep the page table walker + * from accessing non-existent entries. + */ + max_addr = (S390_lowcore.kernel_asce.val & _ASCE_TYPE_MASK) >> 2; + max_addr = 1UL << (max_addr * 11 + 31); pgd = pgd_offset_k(addr); do { - next = pgd_addr_end(addr, MODULES_END); + next = pgd_addr_end(addr, max_addr); if (pgd_none(*pgd)) continue; if (!pgd_folded(*pgd)) { @@ -184,7 +191,7 @@ static void mark_kernel_pgd(void) set_bit(PG_arch_1, &page[i].flags); } mark_kernel_p4d(pgd, addr, next); - } while (pgd++, addr = next, addr != MODULES_END); + } while (pgd++, addr = next, addr != max_addr); }
void __init cmma_init_nodat(void)