linux-kernel - [PATCH 1/2] KVM: make halt_poll

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Message-Id: <1441143676-9375-2-git-send-email-dmatlack@google.com>
Date:	Tue,  1 Sep 2015 14:41:15 -0700
From:	David Matlack <dmatlack@...gle.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, pbonzini@...hat.com,
	wanpeng.li@...mail.com, peter@...ser.ca
Subject: [PATCH 1/2] KVM: make halt_poll_ns per-VCPU

From: Wanpeng Li <wanpeng.li@...mail.com>

Change halt_poll_ns into per-VCPU variable, seeded from module parameter,
to allow greater flexibility.

Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
---
 include/linux/kvm_host.h | 1 +
 virt/kvm/kvm_main.c      | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 05e99b8..382cbef 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -241,6 +241,7 @@ struct kvm_vcpu {
 	int sigset_active;
 	sigset_t sigset;
 	struct kvm_vcpu_stat stat;
+	unsigned int halt_poll_ns;
 
 #ifdef CONFIG_HAS_IOMEM
 	int mmio_needed;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8b8a444..977ffb1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -217,6 +217,7 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 	vcpu->kvm = kvm;
 	vcpu->vcpu_id = id;
 	vcpu->pid = NULL;
+	vcpu->halt_poll_ns = 0;
 	init_waitqueue_head(&vcpu->wq);
 	kvm_async_pf_vcpu_init(vcpu);
 
@@ -1930,8 +1931,8 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 	bool waited = false;
 
 	start = cur = ktime_get();
-	if (halt_poll_ns) {
-		ktime_t stop = ktime_add_ns(ktime_get(), halt_poll_ns);
+	if (vcpu->halt_poll_ns) {
+		ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
 
 		do {
 			/*
-- 
2.5.0.457.gab17608

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