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Re: [Xen-devel] [PATCH][v2] Hybrid extension support in Xen

from [Ian Campbell] [Permanent Link][Original]
To: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][v2] Hybrid extension support in Xen
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Tue, 2 Feb 2010 11:22:21 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>
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On Tue, 2010-02-02 at 08:16 +0000, Sheng Yang wrote:
> 
> +/* Reserve 128KB for grant table */
> +#define GNTTAB_MEMBASE     0xfbfe0000
> +#define GNTTAB_MEMSIZE     0x20000 

Why is this necessary? Isn't the grant table contained within one of the
BARS on the virtual PCI device? What needs grant tables for prior to the
kernel finding the PCI device which necessitates hardcoding these
addresses in both guest and hypervisor?

Ian.


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