linux-kernel - Re: [PATCH v11 07/19] KVM: s390: pv: module parameter to fence asynchronous destroy

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Message-ID: <bcbfcc87-aef4-d151-8e34-4646f1533c25@linux.ibm.com>
Date:   Wed, 15 Jun 2022 11:53:17 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org
Cc:     borntraeger@...ibm.com, thuth@...hat.com, pasic@...ux.ibm.com,
        david@...hat.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, scgl@...ux.ibm.com,
        mimu@...ux.ibm.com, nrb@...ux.ibm.com
Subject: Re: [PATCH v11 07/19] KVM: s390: pv: module parameter to fence
 asynchronous destroy

On 6/3/22 08:56, Claudio Imbrenda wrote:
> Add the module parameter "async_destroy", to allow the asynchronous
> destroy mechanism to be switched off.  This might be useful for
> debugging purposes.
> 
> The parameter is enabled by default.
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> Reviewed-by: Janosch Frank <frankja@...ux.ibm.com>

Normally this would be one of the last patches in the series, no?

> ---
>   arch/s390/kvm/kvm-s390.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 76ad6408cb2c..49e27b5d7c3a 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -206,6 +206,11 @@ unsigned int diag9c_forwarding_hz;
>   module_param(diag9c_forwarding_hz, uint, 0644);
>   MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off");
>   
> +/* allow asynchronous deinit for protected guests, enable by default */
> +static int async_destroy = 1;
> +module_param(async_destroy, int, 0444);
> +MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests");
> +
>   /*
>    * For now we handle at most 16 double words as this is what the s390 base
>    * kernel handles and stores in the prefix page. If we ever need to go beyond