linux-kernel - [PATCH 3.12 77/84] KVM: PPC: Book3S PR: Ignore PMU SPRs

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Date:   Mon, 17 Oct 2016 09:52:04 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Alexander Graf <agraf@...e.de>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 77/84] KVM: PPC: Book3S PR: Ignore PMU SPRs

From: Alexander Graf <agraf@...e.de>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit f8f6eb0d189cf2724af5ebc8cad460c78fb1994e upstream.

When we expose a POWER8 CPU into the guest, it will start accessing PMU SPRs
that we don't emulate. Just ignore accesses to them.

Signed-off-by: Alexander Graf <agraf@...e.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/powerpc/kvm/book3s_emulate.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c
index 360ce68c9809..57913b199919 100644
--- a/arch/powerpc/kvm/book3s_emulate.c
+++ b/arch/powerpc/kvm/book3s_emulate.c
@@ -459,6 +459,13 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
 	case SPRN_WPAR_GEKKO:
 	case SPRN_MSSSR0:
 	case SPRN_DABR:
+#ifdef CONFIG_PPC_BOOK3S_64
+	case SPRN_MMCRS:
+	case SPRN_MMCRA:
+	case SPRN_MMCR0:
+	case SPRN_MMCR1:
+	case SPRN_MMCR2:
+#endif
 		break;
 unprivileged:
 	default:
@@ -557,6 +564,13 @@ int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
 	case SPRN_WPAR_GEKKO:
 	case SPRN_MSSSR0:
 	case SPRN_DABR:
+#ifdef CONFIG_PPC_BOOK3S_64
+	case SPRN_MMCRS:
+	case SPRN_MMCRA:
+	case SPRN_MMCR0:
+	case SPRN_MMCR1:
+	case SPRN_MMCR2:
+#endif
 		*spr_val = 0;
 		break;
 	default:
-- 
2.10.1