linux-kernel - [PATCH 1/3] KVM: PPC: Book3S HV: exit halt polling on need

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Message-Id: <1620466310-8428-1-git-send-email-wanpengli@tencent.com>
Date:   Sat,  8 May 2021 17:31:48 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Paul Mackerras <paulus@...abs.org>
Subject: [PATCH 1/3] KVM: PPC: Book3S HV: exit halt polling on need_resched() as well

From: Wanpeng Li <wanpengli@...cent.com>

Inspired by commit 262de4102c7bb8 (kvm: exit halt polling on need_resched() 
as well), due to PPC implements an arch specific halt polling logic, we should 
add the need_resched() checking there as well.

Cc: Paul Mackerras <paulus@...abs.org>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
---
 arch/powerpc/kvm/book3s_hv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 28a80d2..6199397 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -3936,7 +3936,8 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 				break;
 			}
 			cur = ktime_get();
-		} while (single_task_running() && ktime_before(cur, stop));
+		} while (single_task_running() && !need_resched() &&
+			 ktime_before(cur, stop));
 
 		spin_lock(&vc->lock);
 		vc->vcore_state = VCORE_INACTIVE;
-- 
2.7.4