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| author |   David Hildenbrand <dahi@linux.vnet.ibm.com> | 2016-02-19 10:11:24 +0100 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2016-06-21 09:43:34 +0200 |
| commit | 3573602b20b061030c34b04f206b781857f155df (patch) | |
| tree | 8a5a1fc849a89f6f08c7448578f195594eef3108 /arch/s390/kvm/vsie.c | |
| parent | KVM: s390: vsie: optimize gmap prefix mapping (diff) | |
| download | linux-dev-3573602b20b061030c34b04f206b781857f155df.tar.xz linux-dev-3573602b20b061030c34b04f206b781857f155df.zip | |
KVM: s390: vsie: support setting the ibc
As soon as we forward an ibc to guest 2 (indicated via
kvm->arch.model.ibc), he can also use it for guest 3. Let's properly round
the ibc up/down, so we avoid any potential validity icpts from the
underlying SIE, if it doesn't simply round the values.
Acked-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>
Diffstat (limited to 'arch/s390/kvm/vsie.c')
| -rw-r--r-- | arch/s390/kvm/vsie.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 2839efcfc5ff..1165baf78535 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -102,6 +102,26 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) return 0; } +/* shadow (round up/down) the ibc to avoid validity icpt */ +static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) +{ + struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; + struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; + __u64 min_ibc = (sclp.ibc >> 16) & 0x0fffU; + + scb_s->ibc = 0; + /* ibc installed in g2 and requested for g3 */ + if (vcpu->kvm->arch.model.ibc && (scb_o->ibc & 0x0fffU)) { + scb_s->ibc = scb_o->ibc & 0x0fffU; + /* takte care of the minimum ibc level of the machine */ + if (scb_s->ibc < min_ibc) + scb_s->ibc = min_ibc; + /* take care of the maximum ibc level set for the guest */ + if (scb_s->ibc > vcpu->kvm->arch.model.ibc) + scb_s->ibc = vcpu->kvm->arch.model.ibc; + } +} + /* unshadow the scb, copying parameters back to the real scb */ static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { @@ -214,6 +234,7 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) /* MVPG and Protection Exception Interpretation are always available */ scb_s->eca |= scb_o->eca & 0x01002000U; + prepare_ibc(vcpu, vsie_page); out: if (rc) unshadow_scb(vcpu, vsie_page); |