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s390/mm: disable KSM for storage key enabled pages

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When storage keys are enabled unmerge already merged pages and prevent
new pages from being merged.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Dominik Dingel 2014-10-23 12:09:17 +02:00 committed by Martin Schwidefsky
parent 2faee8ff9d
commit 3ac8e38015
3 changed files with 28 additions and 7 deletions
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2
arch/s390/include/asm/pgtable.h
View File

@ -1751,7 +1751,7 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
extern int vmem_add_mapping(unsigned long start, unsigned long size);
extern int vmem_remove_mapping(unsigned long start, unsigned long size);
extern int s390_enable_sie(void);
extern void s390_enable_skey(void);
extern int s390_enable_skey(void);
extern void s390_reset_cmma(struct mm_struct *mm);
/*

17
arch/s390/kvm/priv.c
View File

@ -156,21 +156,25 @@ static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
return 0;
}
static void __skey_check_enable(struct kvm_vcpu *vcpu)
static int __skey_check_enable(struct kvm_vcpu *vcpu)
{
int rc = 0;
if (!(vcpu->arch.sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)))
return;
return rc;
s390_enable_skey();
rc = s390_enable_skey();
trace_kvm_s390_skey_related_inst(vcpu);
vcpu->arch.sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
return rc;
}
static int handle_skey(struct kvm_vcpu *vcpu)
{
__skey_check_enable(vcpu);
int rc = __skey_check_enable(vcpu);
if (rc)
return rc;
vcpu->stat.instruction_storage_key++;
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
@ -683,7 +687,10 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
}
if (vcpu->run->s.regs.gprs[reg1] & PFMF_SK) {
__skey_check_enable(vcpu);
int rc = __skey_check_enable(vcpu);
if (rc)
return rc;
if (set_guest_storage_key(current->mm, useraddr,
vcpu->run->s.regs.gprs[reg1] & PFMF_KEY,
vcpu->run->s.regs.gprs[reg1] & PFMF_NQ))

16
arch/s390/mm/pgtable.c
View File

@ -18,6 +18,8 @@
#include <linux/rcupdate.h>
#include <linux/slab.h>
#include <linux/swapops.h>
#include <linux/ksm.h>
#include <linux/mman.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@ -1275,22 +1277,34 @@ static int __s390_enable_skey(pte_t *pte, unsigned long addr,
return 0;
}
void s390_enable_skey(void)
int s390_enable_skey(void)
{
struct mm_walk walk = { .pte_entry = __s390_enable_skey };
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int rc = 0;
down_write(&mm->mmap_sem);
if (mm_use_skey(mm))
goto out_up;
mm->context.use_skey = 1;
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (ksm_madvise(vma, vma->vm_start, vma->vm_end,
MADV_UNMERGEABLE, &vma->vm_flags)) {
mm->context.use_skey = 0;
rc = -ENOMEM;
goto out_up;
}
}
mm->def_flags &= ~VM_MERGEABLE;
walk.mm = mm;
walk_page_range(0, TASK_SIZE, &walk);
out_up:
up_write(&mm->mmap_sem);
return rc;
}
EXPORT_SYMBOL_GPL(s390_enable_skey);