leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

s390/kvm: Add PGSTE manipulation functions

Browse Source 
Add PGSTE manipulation functions:
* set_pgste_bits sets specific bits in a PGSTE
* get_pgste returns the whole PGSTE
* pgste_perform_essa manipulates a PGSTE to set specific storage states
* ESSA_[SG]ET_* macros used to indicate the action for manipulate_pgste

Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: Janosch Frank <frankja@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Claudio Imbrenda
2017-04-20 10:03:45 +02:00
committed by Martin Schwidefsky
parent b13de4b7ad
commit 2d42f94773
4 changed files with 185 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
arch/s390/include/asm/pgtable.h
View File

@@ -372,10 +372,12 @@ static inline int is_module_addr(void *addr)
#define PGSTE_VSIE_BIT 0x0000200000000000UL /* ref'd in a shadow table */
/* Guest Page State used for virtualization */
#define _PGSTE_GPS_ZERO 0x0000000080000000UL
#define _PGSTE_GPS_USAGE_MASK 0x0000000003000000UL
#define _PGSTE_GPS_USAGE_STABLE 0x0000000000000000UL
#define _PGSTE_GPS_USAGE_UNUSED 0x0000000001000000UL
#define _PGSTE_GPS_ZERO 0x0000000080000000UL
#define _PGSTE_GPS_USAGE_MASK 0x0000000003000000UL
#define _PGSTE_GPS_USAGE_STABLE 0x0000000000000000UL
#define _PGSTE_GPS_USAGE_UNUSED 0x0000000001000000UL
#define _PGSTE_GPS_USAGE_POT_VOLATILE 0x0000000002000000UL
#define _PGSTE_GPS_USAGE_VOLATILE _PGSTE_GPS_USAGE_MASK
/*
* A user page table pointer has the space-switch-event bit, the
@@ -1041,6 +1043,12 @@ int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr);
int get_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned char *key);
int set_pgste_bits(struct mm_struct *mm, unsigned long addr,
unsigned long bits, unsigned long value);
int get_pgste(struct mm_struct *mm, unsigned long hva, unsigned long *pgstep);
int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc,
unsigned long *oldpte, unsigned long *oldpgste);
/*
* Certain architectures need to do special things when PTEs
* within a page table are directly modified. Thus, the following