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KVM: s390: vsie: support setting the ibc

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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>
This commit is contained in:
David Hildenbrand 2016-02-19 10:11:24 +01:00 committed by Christian Borntraeger
parent 06d68a6c85
commit 3573602b20
1 changed files with 21 additions and 0 deletions
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21
arch/s390/kvm/vsie.c
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@ -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);