On Mon, 28 Aug 2017 10:07:31 +0200 Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote: > From: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxxxxxxx> > Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> > Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> > --- > arch/s390/include/asm/page-states.h | 2 +- > arch/s390/kvm/kvm-s390.c | 8 ++++++-- > arch/s390/kvm/priv.c | 6 +++++- > arch/s390/mm/pgtable.c | 6 +++++- > 4 files changed, 17 insertions(+), 5 deletions(-) This is a bit hard to review without the previous patches (I had to hunt down MACHINE_HAS_TLB_GUEST, for example), and it seems much if not all of this is not externally documented... but it seems consistent and reasonable, so Acked-by: Cornelia Huck <cohuck@xxxxxxxxxx>
