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| author |   Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> | 2016-08-29 15:56:55 +0200 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2017-08-29 15:15:56 +0200 |
| commit | 1bab1c02aff73eb5c3001e97f48e64ab6a80988a (patch) | |
| tree | 799e41232b89f29d072049c0eb2c28479d5ef5f6 /arch/s390/mm | |
| parent | KVM: s390: sthyi: remove invalid guest write access (diff) | |
| download | linux-dev-1bab1c02aff73eb5c3001e97f48e64ab6a80988a.tar.xz linux-dev-1bab1c02aff73eb5c3001e97f48e64ab6a80988a.zip | |
KVM: s390: expose no-DAT to guest and migration support
The STFLE bit 147 indicates whether the ESSA no-DAT operation code is
valid, the bit is not normally provided to the host; the host is
instead provided with an SCLP bit that indicates whether guests can
support the feature.
This patch:
* enables the STFLE bit in the guest if the corresponding SCLP bit is
present in the host.
* adds support for migrating the no-DAT bit in the PGSTEs
* fixes the software interpretation of the ESSA instruction that is
used when migrating, both for the new operation code and for the old
"set stable", as per specifications.
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 8d018c76ee85..459716de5318 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -919,7 +919,7 @@ int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc, case ESSA_GET_STATE: break; case ESSA_SET_STABLE: - pgstev &= ~_PGSTE_GPS_USAGE_MASK; + pgstev &= ~(_PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT); pgstev |= _PGSTE_GPS_USAGE_STABLE; break; case ESSA_SET_UNUSED: @@ -965,6 +965,10 @@ int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc, pgstev |= _PGSTE_GPS_USAGE_STABLE; } break; + case ESSA_SET_STABLE_NODAT: + pgstev &= ~_PGSTE_GPS_USAGE_MASK; + pgstev |= _PGSTE_GPS_USAGE_STABLE | _PGSTE_GPS_NODAT; + break; default: /* we should never get here! */ break; |