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authorHeiko Carstens <hca@linux.ibm.com>2023-10-17 22:07:04 +0300
committerVasily Gorbik <gor@linux.ibm.com>2023-10-23 19:21:23 +0300
commit09cda0a400519b1541591c506e54c9c48e3101bf (patch)
treec6f4d1e1c5d7712a28781dba4f66d1b68dc61c37 /arch/s390
parent16ba44826a04834d3eeeda4b731c2ea3481062b7 (diff)
downloadlinux-09cda0a400519b1541591c506e54c9c48e3101bf.tar.xz
s390/mm: add missing arch_set_page_dat() call to vmem_crst_alloc()
If the cmma no-dat feature is available all pages that are not used for dynamic address translation are marked as "no-dat" with the ESSA instruction. This information is visible to the hypervisor, so that the hypervisor can optimize purging of guest TLB entries. This also means that pages which are used for dynamic address translation must not be marked as "no-dat", since the hypervisor may then incorrectly not purge guest TLB entries. Region and segment tables allocated via vmem_crst_alloc() are incorrectly marked as "no-dat", as soon as slab_is_available() returns true. Such tables are allocated e.g. when kernel page tables are split, memory is hotplugged, or a DCSS segment is loaded. Fix this by adding the missing arch_set_page_dat() call. 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')
-rw-r--r--arch/s390/mm/vmem.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 86384586eb20..2e8a1064f103 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -12,6 +12,7 @@
#include <linux/hugetlb.h>
#include <linux/slab.h>
#include <linux/sort.h>
+#include <asm/page-states.h>
#include <asm/cacheflush.h>
#include <asm/nospec-branch.h>
#include <asm/ctlreg.h>
@@ -46,8 +47,11 @@ void *vmem_crst_alloc(unsigned long val)
unsigned long *table;
table = vmem_alloc_pages(CRST_ALLOC_ORDER);
- if (table)
- crst_table_init(table, val);
+ if (!table)
+ return NULL;
+ crst_table_init(table, val);
+ if (slab_is_available())
+ arch_set_page_dat(virt_to_page(table), CRST_ALLOC_ORDER);
return table;
}