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

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

[K. Y. Srinivasan]

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@microsoft.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;
 }
 
 /*
-- 
1.7.4.1

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

[KY Srinivasan]

> -----Original Message-----
> From: K. Y. Srinivasan [mailto:kys@microsoft.com]
> Sent: Friday, January 18, 2013 12:01 AM
> To: x86@kernel.org; gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; olaf@aepfle.de; apw@canonical.com;
> jasowang@redhat.com; tglx@linutronix.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@microsoft.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
> 
>