From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xen.org>
Subject: Re: [PATCH] VT-d: make remap_entry_to_msi_msg() return
 consistent message
Date: Tue, 02 Oct 2012 18:00:55 +0100
Message-ID: <CC90DC57.4DACF%keir@xen.org>
References: <506B1C6E020000780009F221@nat28.tlf.novell.com>
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To: Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xen.org>
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On 02/10/2012 15:55, "Jan Beulich" <JBeulich@suse.com> wrote:

> During debugging of another problem I found that in x2APIC mode, the
> destination field of the low address value wasn't passed back
> correctly. While this is benign in most cases (as the value isn't being
> used anywhere), it can be confusing (and misguiding) when printing the
> value read or when comparing it to the one previously passed into the
> inverse function.
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Acked-by: Keir Fraser <keir@xen.org>

> --- a/xen/drivers/passthrough/vtd/intremap.c
> +++ b/xen/drivers/passthrough/vtd/intremap.c
> @@ -504,7 +504,11 @@ static int remap_entry_to_msi_msg(
>              MSI_ADDR_REDIRECTION_CPU:
>              MSI_ADDR_REDIRECTION_LOWPRI);
>      if ( x2apic_enabled )
> +    {
>          msg->dest32 = iremap_entry->lo.dst;
> +        msg->address_lo |=
> +            (iremap_entry->lo.dst & 0xff) << MSI_ADDR_DEST_ID_SHIFT;
> +    }
>      else
>          msg->address_lo |=
>              ((iremap_entry->lo.dst >> 8) & 0xff ) << MSI_ADDR_DEST_ID_SHIFT;
> 
> 
> 
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