linux-kernel - [PATCH 5.18 631/879] KVM: PPC: Book3S HV: Fix vcore

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Date:   Tue,  7 Jun 2022 19:02:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Fabiano Rosas <farosas@...ux.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 631/879] KVM: PPC: Book3S HV: Fix vcore_blocked tracepoint

From: Fabiano Rosas <farosas@...ux.ibm.com>

[ Upstream commit ad55bae7dc364417434b69dd6c30104f20d0f84d ]

We removed most of the vcore logic from the P9 path but there's still
a tracepoint that tried to dereference vc->runner.

Fixes: ecb6a7207f92 ("KVM: PPC: Book3S HV P9: Remove most of the vcore logic")
Signed-off-by: Fabiano Rosas <farosas@...ux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@...il.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20220328215831.320409-1-farosas@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/kvm/book3s_hv.c | 8 ++++----
 arch/powerpc/kvm/trace_hv.h  | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 43af871383c2..aef0a6b423d8 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4233,13 +4233,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 	start_wait = ktime_get();
 
 	vc->vcore_state = VCORE_SLEEPING;
-	trace_kvmppc_vcore_blocked(vc, 0);
+	trace_kvmppc_vcore_blocked(vc->runner, 0);
 	spin_unlock(&vc->lock);
 	schedule();
 	finish_rcuwait(&vc->wait);
 	spin_lock(&vc->lock);
 	vc->vcore_state = VCORE_INACTIVE;
-	trace_kvmppc_vcore_blocked(vc, 1);
+	trace_kvmppc_vcore_blocked(vc->runner, 1);
 	++vc->runner->stat.halt_successful_wait;
 
 	cur = ktime_get();
@@ -4619,9 +4619,9 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
 			if (kvmppc_vcpu_check_block(vcpu))
 				break;
 
-			trace_kvmppc_vcore_blocked(vc, 0);
+			trace_kvmppc_vcore_blocked(vcpu, 0);
 			schedule();
-			trace_kvmppc_vcore_blocked(vc, 1);
+			trace_kvmppc_vcore_blocked(vcpu, 1);
 		}
 		finish_rcuwait(wait);
 	}
diff --git a/arch/powerpc/kvm/trace_hv.h b/arch/powerpc/kvm/trace_hv.h
index 38cd0ed0a617..32e2cb5811cc 100644
--- a/arch/powerpc/kvm/trace_hv.h
+++ b/arch/powerpc/kvm/trace_hv.h
@@ -409,9 +409,9 @@ TRACE_EVENT(kvmppc_run_core,
 );
 
 TRACE_EVENT(kvmppc_vcore_blocked,
-	TP_PROTO(struct kvmppc_vcore *vc, int where),
+	TP_PROTO(struct kvm_vcpu *vcpu, int where),
 
-	TP_ARGS(vc, where),
+	TP_ARGS(vcpu, where),
 
 	TP_STRUCT__entry(
 		__field(int,	n_runnable)
@@ -421,8 +421,8 @@ TRACE_EVENT(kvmppc_vcore_blocked,
 	),
 
 	TP_fast_assign(
-		__entry->runner_vcpu = vc->runner->vcpu_id;
-		__entry->n_runnable  = vc->n_runnable;
+		__entry->runner_vcpu = vcpu->vcpu_id;
+		__entry->n_runnable  = vcpu->arch.vcore->n_runnable;
 		__entry->where       = where;
 		__entry->tgid	     = current->tgid;
 	),
-- 
2.35.1