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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2015-04-15 14:23:26 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-04-23 17:55:49 +0300
commit0b46e0a3ec0d7a04af6a091354f1b5e1b952d70a (patch)
tree011ed5650974aad0df2e6a6c9952e1fc2f935dec /arch/s390/include/asm/mmu.h
parent7e01b5acd88b3f3108d8c4ce44e3205d67437202 (diff)
downloadlinux-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/mmu.h')
-rw-r--r--arch/s390/include/asm/mmu.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index a5e656260a70..d29ad9545b41 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -14,7 +14,9 @@ typedef struct {
unsigned long asce_bits;
unsigned long asce_limit;
unsigned long vdso_base;
- /* The mmu context has extended page tables. */
+ /* The mmu context allocates 4K page tables. */
+ unsigned int alloc_pgste:1;
+ /* The mmu context uses extended page tables. */
unsigned int has_pgste:1;
/* The mmu context uses storage keys. */
unsigned int use_skey:1;