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

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Message-ID: <CALzav=f2DHEuLCSTCqiV0ruktoUt+AHKuksvssBLBq=Sp7NOOg@mail.gmail.com>
Date:	Mon, 24 Aug 2015 09:59:04 -0700
From:	David Matlack <dmatlack@...gle.com>
To:	Wanpeng Li <wanpeng.li@...mail.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	kvm list <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] KVM: make halt_poll_ns per-VCPU

On Mon, Aug 24, 2015 at 5:53 AM, Wanpeng Li <wanpeng.li@...mail.com> wrote:
> Change halt_poll_ns into per-VCPU variable, seeded from module parameter,
> to allow greater flexibility.

You should also change kvm_vcpu_block to read halt_poll_ns from
the vcpu instead of the module parameter.

>
> Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
> ---
>  include/linux/kvm_host.h | 1 +
>  virt/kvm/kvm_main.c      | 1 +
>  2 files changed, 2 insertions(+)
>
> 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..a122b52 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 = halt_poll_ns;
>         init_waitqueue_head(&vcpu->wq);
>         kvm_async_pf_vcpu_init(vcpu);
>
> --
> 1.9.1
>
> --
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