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KVM: s390: handle missing storage-key facility

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Without the storage-key facility, SIE won't interpret SSKE, ISKE and
RRBE for us. So let's add proper interception handlers that will be called
if lazy sske cannot be enabled.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand
2016-05-10 09:50:21 +02:00
committed by Christian Borntraeger
parent 11ddcd41bc
commit a7e19ab55f
4 changed files with 184 additions and 11 deletions
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7
arch/s390/include/asm/page.h
View File

@@ -109,13 +109,14 @@ static inline unsigned char page_get_storage_key(unsigned long addr)
static inline int page_reset_referenced(unsigned long addr)
{
unsigned int ipm;
int cc;
asm volatile(
" rrbe 0,%1\n"
" ipm %0\n"
: "=d" (ipm) : "a" (addr) : "cc");
return !!(ipm & 0x20000000);
" srl %0,28\n"
: "=d" (cc) : "a" (addr) : "cc");
return cc;
}
/* Bits int the storage key */

1
arch/s390/include/asm/pgtable.h
View File

@@ -896,6 +896,7 @@ int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
int cond_set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned char key, unsigned char *oldkey,
bool nq, bool mr, bool mc);
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);