linux-kernel - Re: [PATCH] Guest stop notification

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Date:	Tue, 29 Nov 2011 16:10:21 -0600
From:	Anthony Liguori <aliguori@...ibm.com>
To:	Eric B Munson <emunson@...bm.net>
CC:	qemu-devel@...gnu.org, ryanh@...ux.vnet.ibm.com,
	mtosatti@...hat.com, avi@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Guest stop notification

On 11/29/2011 03:36 PM, Eric B Munson wrote:
> Often when a guest is stopped from the qemu console, it will report spurious
> soft lockup warnings on resume.  There are kernel patches being discussed that
> will give the host the ability to tell the guest that it is being stopped and
> should ignore the soft lockup warning that generates.
>
> Signed-off-by: Eric B Munson<emunson@...bm.net>

Reviewed-by: Anthony Liguori <aliguori@...ibm.com>

Regards,

Anthony Liguori

> Cc: ryanh@...ux.vnet.ibm.com
> Cc: aliguori@...ibm.com
> Cc: mtosatti@...hat.com
> Cc: avi@...hat.com
> Cc: kvm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
>   target-i386/kvm.c |    6 ++++++
>   1 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/target-i386/kvm.c b/target-i386/kvm.c
> index 5bfc21f..defd364 100644
> --- a/target-i386/kvm.c
> +++ b/target-i386/kvm.c
> @@ -336,12 +336,18 @@ static int kvm_inject_mce_oldstyle(CPUState *env)
>       return 0;
>   }
>
> +static void kvm_put_guest_paused(CPUState *penv)
> +{
> +    kvm_vcpu_ioctl(penv, KVM_GUEST_PAUSED, 0);
> +}
> +
>   static void cpu_update_state(void *opaque, int running, RunState state)
>   {
>       CPUState *env = opaque;
>
>       if (running) {
>           env->tsc_valid = false;
> +	kvm_put_guest_paused(env);
>       }
>   }
>

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