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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 | |
| parent | Linux 4.13-rc2 (diff) | |
| download | linux-dev-c9b5ad546e7d486465a3dd8c89245ac3707a4384.tar.xz linux-dev-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')
| -rw-r--r-- | arch/s390/include/asm/page-states.h | 1 | ||||
| -rw-r--r-- | arch/s390/include/asm/page.h | 3 | ||||
| -rw-r--r-- | arch/s390/include/asm/setup.h | 3 |
3 files changed, 6 insertions, 1 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 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) diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h index cd78155b1829..11e59ba4b521 100644 --- a/arch/s390/include/asm/setup.h +++ b/arch/s390/include/asm/setup.h @@ -106,7 +106,8 @@ extern void pfault_fini(void); void report_user_fault(struct pt_regs *regs, long signr, int is_mm_fault); -extern void cmma_init(void); +void cmma_init(void); +void cmma_init_nodat(void); extern void (*_machine_restart)(char *command); extern void (*_machine_halt)(void); |