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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-04-15 11:23:26 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-04-23 14:55:49 (GMT) |
| commit | 0b46e0a3ec0d7a04af6a091354f1b5e1b952d70a (patch) | |
| tree | 011ed5650974aad0df2e6a6c9952e1fc2f935dec /arch/s390/include/asm/pgtable.h | |
| parent | 7e01b5acd88b3f3108d8c4ce44e3205d67437202 (diff) | |
| download | linux-0b46e0a3ec0d7a04af6a091354f1b5e1b952d70a.tar.xz | |
s390/kvm: remove delayed reallocation of page tables for KVM
Replacing a 2K page table with a 4K page table while a VMA is active
for the affected memory region is fundamentally broken. Rip out the
page table reallocation code and replace it with a simple system
control 'vm.allocate_pgste'. If the system control is set the page
tables for all processes are allocated as full 4K pages, even for
processes that do not need it.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/pgtable.h')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 989cfae..1fba639 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -423,6 +423,15 @@ static inline int mm_has_pgste(struct mm_struct *mm) return 0; } +static inline int mm_alloc_pgste(struct mm_struct *mm) +{ +#ifdef CONFIG_PGSTE + if (unlikely(mm->context.alloc_pgste)) + return 1; +#endif + return 0; +} + /* * In the case that a guest uses storage keys * faults should no longer be backed by zero pages |