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KVM: s390: Add storage key facility interpretation control

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Up to now we always expected to have the storage key facility
available for our (non-VSIE) KVM guests. For huge page support, we
need to be able to disable it, so let's introduce that now.

We add the use_skf variable to manage KVM storage key facility
usage. Also we rename use_skey in the mm context struct to uses_skeys
to make it more clear that it is an indication that the vm actively
uses storage keys.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank
2018-02-15 16:33:47 +01:00
committed by Christian Borntraeger
parent 75bc37fefc
commit 55531b7431
8 changed files with 28 additions and 22 deletions
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1
arch/s390/include/asm/kvm_host.h
View File

@@ -812,6 +812,7 @@ struct kvm_arch{
int use_irqchip;
int use_cmma;
int use_pfmfi;
int use_skf;
int user_cpu_state_ctrl;
int user_sigp;
int user_stsi;

2
arch/s390/include/asm/mmu.h
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@@ -21,7 +21,7 @@ typedef struct {
/* The mmu context uses extended page tables. */
unsigned int has_pgste:1;
/* The mmu context uses storage keys. */
unsigned int use_skey:1;
unsigned int uses_skeys:1;
/* The mmu context uses CMM. */
unsigned int uses_cmm:1;
} mm_context_t;

2
arch/s390/include/asm/mmu_context.h
View File

@@ -30,7 +30,7 @@ static inline int init_new_context(struct task_struct *tsk,
test_thread_flag(TIF_PGSTE) ||
(current->mm && current->mm->context.alloc_pgste);
mm->context.has_pgste = 0;
mm->context.use_skey = 0;
mm->context.uses_skeys = 0;
mm->context.uses_cmm = 0;
#endif
switch (mm->context.asce_limit) {

4
arch/s390/include/asm/pgtable.h
View File

@@ -507,10 +507,10 @@ static inline int mm_alloc_pgste(struct mm_struct *mm)
* faults should no longer be backed by zero pages
*/
#define mm_forbids_zeropage mm_has_pgste
static inline int mm_use_skey(struct mm_struct *mm)
static inline int mm_uses_skeys(struct mm_struct *mm)
{
#ifdef CONFIG_PGSTE
if (mm->context.use_skey)
if (mm->context.uses_skeys)
return 1;
#endif
return 0;