linux-kernel - RE: [PATCH 1/1] Drivers: hv: Bind all vmbbus interrupts to the boot CPU

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Date:	Fri, 18 Jan 2013 17:27:09 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	KY Srinivasan <kys@...rosoft.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: RE: [PATCH 1/1] Drivers: hv: Bind all vmbbus interrupts to the boot
 CPU


> -----Original Message-----
> From: K. Y. Srinivasan [mailto:kys@...rosoft.com]
> Sent: Friday, January 18, 2013 12:01 AM
> To: x86@...nel.org; gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> jasowang@...hat.com; tglx@...utronix.de
> Cc: KY Srinivasan
> Subject: [PATCH 1/1] Drivers: hv: Bind all vmbbus interrupts to the boot CPU
> 
> The default interrupt delivery model in Linux does not support the Hyper-V
> vmbus delivery model when the guest is configured with multiple VCPUs. I have
> sent a patch to address this - delivering the vmbus interrupt on a separate
> IDT vector. Until this patch is applied, bind all vmbus interrupts to the boot
> CPU.
> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> ---
>  drivers/hv/channel_mgmt.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
> index c80fe62..7478ef9 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -337,7 +337,7 @@ static u32 get_vp_index(uuid_le *type_guid)
>  		return 0;
>  	}
>  	cur_cpu = (++next_vp % max_cpus);
> -	return hv_context.vp_index[cur_cpu];
> +	return 0;
>  }

Greg,

Please apply this patch. This temporary restriction will be removed once the Hyper-V IDT
Patch (or some variant of that) is applied. 

Regards,

K. Y
> 
>  /*
> --
> 1.7.4.1
> 
> 


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