linux-kernel - Re: [PATCH v7 1/3] KVM: make halt_poll

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Date:	Sun, 6 Sep 2015 16:33:52 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Wanpeng Li <wanpeng.li@...mail.com>
Cc:	David Matlack <dmatlack@...gle.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/3] KVM: make halt_poll_ns per-vCPU



On 03/09/2015 16:07, Wanpeng Li wrote:
> 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 81089cf..1bef9e2 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -242,6 +242,7 @@ 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 d8db2f8f..c06e57c 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 {
>  			/*
> 

Applied, thanks.

Paolo
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