linux-kernel - [PATCH v2 4/4] KVM: PPC: Introduce new capability for 2nd DAWR

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Date:   Tue, 24 Nov 2020 16:29:53 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     mpe@...erman.id.au, paulus@...ba.org
Cc:     ravi.bangoria@...ux.ibm.com, mikey@...ling.org, npiggin@...il.com,
        leobras.c@...il.com, pbonzini@...hat.com, christophe.leroy@....fr,
        jniethe5@...il.com, kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 4/4] KVM: PPC: Introduce new capability for 2nd DAWR

Introduce KVM_CAP_PPC_DAWR1 which can be used by Qemu to query whether
kvm supports 2nd DAWR or not.

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
---
 arch/powerpc/kvm/powerpc.c | 3 +++
 include/uapi/linux/kvm.h   | 1 +
 2 files changed, 4 insertions(+)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 13999123b735..48763fe59fc5 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -679,6 +679,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 			!kvmppc_hv_ops->enable_svm(NULL);
 		break;
 #endif
+	case KVM_CAP_PPC_DAWR1:
+		r = cpu_has_feature(CPU_FTR_DAWR1);
+		break;
 	default:
 		r = 0;
 		break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index f6d86033c4fa..0f32d6cbabc2 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1035,6 +1035,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_LAST_CPU 184
 #define KVM_CAP_SMALLER_MAXPHYADDR 185
 #define KVM_CAP_S390_DIAG318 186
+#define KVM_CAP_PPC_DAWR1 187
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.26.2