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| author | Martin Schwidefsky | 2016-06-14 12:56:01 +0200 |
|---|---|---|
| committer | Martin Schwidefsky | 2017-07-25 06:55:28 +0200 |
| commit | c9b5ad546e7d486465a3dd8c89245ac3707a4384 (patch) | |
| tree | 5c073b778a64cfee1efc5e9f27b6a4caae82b764 /arch/s390/include/asm/page.h | |
| parent | Linux 4.13-rc2 (diff) | |
| download | kernel-qcow2-linux-c9b5ad546e7d486465a3dd8c89245ac3707a4384.tar.gz kernel-qcow2-linux-c9b5ad546e7d486465a3dd8c89245ac3707a4384.tar.xz kernel-qcow2-linux-c9b5ad546e7d486465a3dd8c89245ac3707a4384.zip | |
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.h')
| -rw-r--r-- | arch/s390/include/asm/page.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index 624deaa44230..b463df89f344 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -133,6 +133,9 @@ static inline int page_reset_referenced(unsigned long addr) struct page; void arch_free_page(struct page *page, int order); void arch_alloc_page(struct page *page, int order); +void arch_set_page_dat(struct page *page, int order); +void arch_set_page_nodat(struct page *page, int order); +int arch_test_page_nodat(struct page *page); void arch_set_page_states(int make_stable); static inline int devmem_is_allowed(unsigned long pfn) |