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s390/mm: tag normal pages vs pages used in page tables

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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>
This commit is contained in:
Martin Schwidefsky
2016-06-14 12:56:01 +02:00
parent 520eccdfe1
commit c9b5ad546e
8 changed files with 209 additions and 22 deletions
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3
arch/s390/include/asm/page.h
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@@ -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)