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-rw-r--r--arch/s390/include/asm/kvm_host.h4
-rw-r--r--arch/s390/include/uapi/asm/kvm.h21
-rw-r--r--arch/s390/kvm/kvm-s390.c132
3 files changed, 156 insertions, 1 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 79dc3b0aa65f..d84559e31f32 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -89,7 +89,8 @@ struct kvm_s390_sie_block {
atomic_t cpuflags; /* 0x0000 */
__u32 : 1; /* 0x0004 */
__u32 prefix : 18;
- __u32 : 13;
+ __u32 : 1;
+ __u32 ibc : 12;
__u8 reserved08[4]; /* 0x0008 */
#define PROG_IN_SIE (1<<0)
__u32 prog0c; /* 0x000c */
@@ -524,6 +525,7 @@ struct s390_model_fac {
struct kvm_s390_cpu_model {
struct s390_model_fac *fac;
struct cpuid cpu_id;
+ unsigned short ibc;
};
struct kvm_s390_crypto {
diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index 546fc3a302e5..9c77e60b9a26 100644
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -59,6 +59,7 @@ struct kvm_s390_io_adapter_req {
#define KVM_S390_VM_MEM_CTRL 0
#define KVM_S390_VM_TOD 1
#define KVM_S390_VM_CRYPTO 2
+#define KVM_S390_VM_CPU_MODEL 3
/* kvm attributes for mem_ctrl */
#define KVM_S390_VM_MEM_ENABLE_CMMA 0
@@ -69,6 +70,26 @@ struct kvm_s390_io_adapter_req {
#define KVM_S390_VM_TOD_LOW 0
#define KVM_S390_VM_TOD_HIGH 1
+/* kvm attributes for KVM_S390_VM_CPU_MODEL */
+/* processor related attributes are r/w */
+#define KVM_S390_VM_CPU_PROCESSOR 0
+struct kvm_s390_vm_cpu_processor {
+ __u64 cpuid;
+ __u16 ibc;
+ __u8 pad[6];
+ __u64 fac_list[256];
+};
+
+/* machine related attributes are r/o */
+#define KVM_S390_VM_CPU_MACHINE 1
+struct kvm_s390_vm_cpu_machine {
+ __u64 cpuid;
+ __u32 ibc;
+ __u8 pad[4];
+ __u64 fac_mask[256];
+ __u64 fac_list[256];
+};
+
/* kvm attributes for crypto */
#define KVM_S390_VM_CRYPTO_ENABLE_AES_KW 0
#define KVM_S390_VM_CRYPTO_ENABLE_DEA_KW 1
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 8c538a1a23c1..0c3623927563 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -502,6 +502,106 @@ static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
return ret;
}
+static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_processor *proc;
+ int ret = 0;
+
+ mutex_lock(&kvm->lock);
+ if (atomic_read(&kvm->online_vcpus)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ proc = kzalloc(sizeof(*proc), GFP_KERNEL);
+ if (!proc) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ if (!copy_from_user(proc, (void __user *)attr->addr,
+ sizeof(*proc))) {
+ memcpy(&kvm->arch.model.cpu_id, &proc->cpuid,
+ sizeof(struct cpuid));
+ kvm->arch.model.ibc = proc->ibc;
+ memcpy(kvm->arch.model.fac->kvm, proc->fac_list,
+ S390_ARCH_FAC_LIST_SIZE_BYTE);
+ } else
+ ret = -EFAULT;
+ kfree(proc);
+out:
+ mutex_unlock(&kvm->lock);
+ return ret;
+}
+
+static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret = -ENXIO;
+
+ switch (attr->attr) {
+ case KVM_S390_VM_CPU_PROCESSOR:
+ ret = kvm_s390_set_processor(kvm, attr);
+ break;
+ }
+ return ret;
+}
+
+static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_processor *proc;
+ int ret = 0;
+
+ proc = kzalloc(sizeof(*proc), GFP_KERNEL);
+ if (!proc) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ memcpy(&proc->cpuid, &kvm->arch.model.cpu_id, sizeof(struct cpuid));
+ proc->ibc = kvm->arch.model.ibc;
+ memcpy(&proc->fac_list, kvm->arch.model.fac->kvm, S390_ARCH_FAC_LIST_SIZE_BYTE);
+ if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
+ ret = -EFAULT;
+ kfree(proc);
+out:
+ return ret;
+}
+
+static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ struct kvm_s390_vm_cpu_machine *mach;
+ int ret = 0;
+
+ mach = kzalloc(sizeof(*mach), GFP_KERNEL);
+ if (!mach) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ get_cpu_id((struct cpuid *) &mach->cpuid);
+ mach->ibc = sclp_get_ibc();
+ memcpy(&mach->fac_mask, kvm_s390_fac_list_mask,
+ kvm_s390_fac_list_mask_size() * sizeof(u64));
+ memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
+ S390_ARCH_FAC_LIST_SIZE_U64);
+ if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
+ ret = -EFAULT;
+ kfree(mach);
+out:
+ return ret;
+}
+
+static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret = -ENXIO;
+
+ switch (attr->attr) {
+ case KVM_S390_VM_CPU_PROCESSOR:
+ ret = kvm_s390_get_processor(kvm, attr);
+ break;
+ case KVM_S390_VM_CPU_MACHINE:
+ ret = kvm_s390_get_machine(kvm, attr);
+ break;
+ }
+ return ret;
+}
+
static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
int ret;
@@ -513,6 +613,9 @@ static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_TOD:
ret = kvm_s390_set_tod(kvm, attr);
break;
+ case KVM_S390_VM_CPU_MODEL:
+ ret = kvm_s390_set_cpu_model(kvm, attr);
+ break;
case KVM_S390_VM_CRYPTO:
ret = kvm_s390_vm_set_crypto(kvm, attr);
break;
@@ -535,6 +638,9 @@ static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_TOD:
ret = kvm_s390_get_tod(kvm, attr);
break;
+ case KVM_S390_VM_CPU_MODEL:
+ ret = kvm_s390_get_cpu_model(kvm, attr);
+ break;
default:
ret = -ENXIO;
break;
@@ -571,6 +677,17 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
break;
}
break;
+ case KVM_S390_VM_CPU_MODEL:
+ switch (attr->attr) {
+ case KVM_S390_VM_CPU_PROCESSOR:
+ case KVM_S390_VM_CPU_MACHINE:
+ ret = 0;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ break;
case KVM_S390_VM_CRYPTO:
switch (attr->attr) {
case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
@@ -782,6 +899,17 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
S390_ARCH_FAC_LIST_SIZE_U64);
/*
+ * If this KVM host runs *not* in a LPAR, relax the facility bits
+ * of the kvm facility mask by all missing facilities. This will allow
+ * to determine the right CPU model by means of the remaining facilities.
+ * Live guest migration must prohibit the migration of KVMs running in
+ * a LPAR to non LPAR hosts.
+ */
+ if (!MACHINE_IS_LPAR)
+ for (i = 0; i < kvm_s390_fac_list_mask_size(); i++)
+ kvm_s390_fac_list_mask[i] &= kvm->arch.model.fac->kvm[i];
+
+ /*
* Apply the kvm facility mask to limit the kvm supported/tolerated
* facility list.
*/
@@ -793,6 +921,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
}
kvm_s390_get_cpu_id(&kvm->arch.model.cpu_id);
+ kvm->arch.model.ibc = sclp_get_ibc() & 0x0fff;
if (kvm_s390_crypto_init(kvm) < 0)
goto out_crypto;
@@ -1034,9 +1163,12 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
+ mutex_lock(&vcpu->kvm->lock);
vcpu->arch.cpu_id = vcpu->kvm->arch.model.cpu_id;
memcpy(vcpu->kvm->arch.model.fac->sie, vcpu->kvm->arch.model.fac->kvm,
S390_ARCH_FAC_LIST_SIZE_BYTE);
+ vcpu->arch.sie_block->ibc = vcpu->kvm->arch.model.ibc;
+ mutex_unlock(&vcpu->kvm->lock);
kvm_s390_vcpu_crypto_setup(vcpu);
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-09 20:58:37 +0300