linux-kernel - [PATCH 3/5] KVM: ensure pool time is longer than block

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Date:   Sat, 26 Oct 2019 11:23:57 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     kvm@...r.kernel.org, mtosatti@...hat.com,
        joao.m.martins@...cle.com, rafael.j.wysocki@...el.com,
        rkrcmar@...hat.com, pbonzini@...hat.com,
        Zhenzhong Duan <zhenzhong.duan@...cle.com>
Subject: [PATCH 3/5] KVM: ensure pool time is longer than block_ns

When (block_ns == vcpu->halt_poll_ns), there is not a margin so that
vCPU may still get into block state unnecessorily.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
---
 virt/kvm/kvm_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 1b6fe3b..48a1f1a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2371,7 +2371,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 		if (!vcpu_valid_wakeup(vcpu)) {
 			shrink_halt_poll_ns(vcpu);
 		} else if (halt_poll_ns) {
-			if (block_ns <= vcpu->halt_poll_ns)
+			if (block_ns < vcpu->halt_poll_ns)
 				;
 			/* we had a short halt and our poll time is too small */
 			else if (block_ns < halt_poll_ns)
-- 
1.8.3.1