KVM: s390: Add KVM_CAP_S390_PROTECTED_DUMP

The capability indicates dump support for protected VMs.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20220517163629.3443-9-frankja@linux.ibm.com
Message-Id: <20220517163629.3443-9-frankja@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 37be2a3..d1a32eb 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -606,6 +606,26 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
        case KVM_CAP_S390_PROTECTED:
                r = is_prot_virt_host();
                break;
+       case KVM_CAP_S390_PROTECTED_DUMP: {
+               u64 pv_cmds_dump[] = {
+                       BIT_UVC_CMD_DUMP_INIT,
+                       BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE,
+                       BIT_UVC_CMD_DUMP_CPU,
+                       BIT_UVC_CMD_DUMP_COMPLETE,
+               };
+               int i;
+
+               r = is_prot_virt_host();
+
+               for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) {
+                       if (!test_bit_inv(pv_cmds_dump[i],
+                                         (unsigned long *)&uv_info.inst_calls_list)) {
+                               r = 0;
+                               break;
+                       }
+               }
+               break;
+       }
        default:
                r = 0;
        }

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index af5d254..c4a3291 100644 (file)
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1157,6 +1157,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_VM_TSC_CONTROL 214
 #define KVM_CAP_SYSTEM_EVENT_DATA 215
 #define KVM_CAP_ARM_SYSTEM_SUSPEND 216
+#define KVM_CAP_S390_PROTECTED_DUMP 217
 
 #ifdef KVM_CAP_IRQ_ROUTING