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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-06-14 12:56:01 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-07-25 06:55:28 +0200 |
| commit | c9b5ad546e7d486465a3dd8c89245ac3707a4384 (patch) | |
| tree | 5c073b778a64cfee1efc5e9f27b6a4caae82b764 /arch/s390/include/asm/page-states.h | |
| parent | 520eccdfe187591a51ea9ab4c1a024ae4d0f68d9 (diff) | |
| download | linux-c9b5ad546e7d486465a3dd8c89245ac3707a4384.tar.gz | |
s390/mm: tag normal pages vs pages used in page tables
The ESSA instruction has a new option that allows to tag pages that
are not used as a page table. Without the tag the hypervisor has to
assume that any guest page could be used in a page table inside the
guest. This forces the hypervisor to flush all guest TLB entries
whenever a host page table entry is invalidated. With the tag
the host can skip the TLB flush if the page is tagged as normal page.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/page-states.h')
| -rw-r--r-- | arch/s390/include/asm/page-states.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/page-states.h b/arch/s390/include/asm/page-states.h index 42267a2fe29e..ca21b28a7b17 100644 --- a/arch/s390/include/asm/page-states.h +++ b/arch/s390/include/asm/page-states.h @@ -13,6 +13,7 @@ #define ESSA_SET_POT_VOLATILE 4 #define ESSA_SET_STABLE_RESIDENT 5 #define ESSA_SET_STABLE_IF_RESIDENT 6 +#define ESSA_SET_STABLE_NODAT 7 #define ESSA_MAX ESSA_SET_STABLE_IF_RESIDENT |