KVM: s390: Make provisions for ESCA utilization
This patch updates the routines (sca_*) to provide transparent access
to and manipulation on the data for both Basic and Extended SCA in use.
The kvm.arch.sca is generalized to (void *) to handle BSCA/ESCA cases.
Also the kvm.arch.use_esca flag is provided.
The actual functionality is kept the same.
Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index c268352..41b3fed 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1077,6 +1077,15 @@
return 0;
}
+static void sca_dispose(struct kvm *kvm)
+{
+ if (kvm->arch.use_esca)
+ BUG(); /* not implemented yet */
+ else
+ free_page((unsigned long)(kvm->arch.sca));
+ kvm->arch.sca = NULL;
+}
+
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
int i, rc;
@@ -1100,6 +1109,7 @@
rc = -ENOMEM;
+ kvm->arch.use_esca = 0; /* start with basic SCA */
kvm->arch.sca = (struct bsca_block *) get_zeroed_page(GFP_KERNEL);
if (!kvm->arch.sca)
goto out_err;
@@ -1180,7 +1190,7 @@
kfree(kvm->arch.crypto.crycb);
free_page((unsigned long)kvm->arch.model.fac);
debug_unregister(kvm->arch.dbf);
- free_page((unsigned long)(kvm->arch.sca));
+ sca_dispose(kvm);
KVM_EVENT(3, "creation of vm failed: %d", rc);
return rc;
}
@@ -1226,7 +1236,7 @@
{
kvm_free_vcpus(kvm);
free_page((unsigned long)kvm->arch.model.fac);
- free_page((unsigned long)(kvm->arch.sca));
+ sca_dispose(kvm);
debug_unregister(kvm->arch.dbf);
kfree(kvm->arch.crypto.crycb);
if (!kvm_is_ucontrol(kvm))
@@ -1249,23 +1259,41 @@
static void sca_del_vcpu(struct kvm_vcpu *vcpu)
{
- struct bsca_block *sca = vcpu->kvm->arch.sca;
+ if (vcpu->kvm->arch.use_esca) {
+ struct esca_block *sca = vcpu->kvm->arch.sca;
- clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
- if (sca->cpu[vcpu->vcpu_id].sda == (__u64) vcpu->arch.sie_block)
- sca->cpu[vcpu->vcpu_id].sda = 0;
+ clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
+ if (sca->cpu[vcpu->vcpu_id].sda == (__u64) vcpu->arch.sie_block)
+ sca->cpu[vcpu->vcpu_id].sda = 0;
+ } else {
+ struct bsca_block *sca = vcpu->kvm->arch.sca;
+
+ clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
+ if (sca->cpu[vcpu->vcpu_id].sda == (__u64) vcpu->arch.sie_block)
+ sca->cpu[vcpu->vcpu_id].sda = 0;
+ }
}
static void sca_add_vcpu(struct kvm_vcpu *vcpu, struct kvm *kvm,
unsigned int id)
{
- struct bsca_block *sca = kvm->arch.sca;
+ if (kvm->arch.use_esca) {
+ struct esca_block *sca = kvm->arch.sca;
- if (!sca->cpu[id].sda)
- sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
- vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
- vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
- set_bit_inv(id, (unsigned long *) &sca->mcn);
+ if (!sca->cpu[id].sda)
+ sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
+ vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
+ vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
+ set_bit_inv(id, (unsigned long *) sca->mcn);
+ } else {
+ struct bsca_block *sca = kvm->arch.sca;
+
+ if (!sca->cpu[id].sda)
+ sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
+ vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
+ vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
+ set_bit_inv(id, (unsigned long *) &sca->mcn);
+ }
}
static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
@@ -1458,6 +1486,8 @@
vcpu->arch.sie_block->ecb |= 0x10;
vcpu->arch.sie_block->ecb2 = 8;
+ if (vcpu->kvm->arch.use_esca)
+ vcpu->arch.sie_block->ecb2 |= 4;
vcpu->arch.sie_block->eca = 0xC1002000U;
if (sclp.has_siif)
vcpu->arch.sie_block->eca |= 1;