[PATCH v5 08/10] kvm: s390: Add KVM_CAP_S390_PROTECTED_DUMP

From: Janosch Frank <frankja@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org, borntraeger@linux.ibm.com,
	imbrenda@linux.ibm.com
Subject: [PATCH v5 08/10] kvm: s390: Add KVM_CAP_S390_PROTECTED_DUMP
Date: Mon, 16 May 2022 09:08:15 +0000	[thread overview]
Message-ID: <20220516090817.1110090-9-frankja@linux.ibm.com> (raw)
In-Reply-To: <20220516090817.1110090-1-frankja@linux.ibm.com>

The capability indicates dump support for protected VMs.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 20 ++++++++++++++++++++
 include/uapi/linux/kvm.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index c0c848c84552..1d65235ed3d3 100644
--- 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;
+
+		if (!is_prot_virt_host())
+			return 0;
+
+		r = 1;
+		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))
+				return 0;
+		}
+		break;
+	}
 	default:
 		r = 0;
 	}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 0a8b57654ea7..ba8f2985a8c0 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1152,6 +1152,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_DISABLE_QUIRKS2 213
 /* #define KVM_CAP_VM_TSC_CONTROL 214 */
 #define KVM_CAP_SYSTEM_EVENT_DATA 215
+#define KVM_CAP_S390_PROTECTED_DUMP 216
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.34.1

