Re: [Xen-devel] [VTD][patch 1/1] vt-d hardware check

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

vtd_hw_check() clears vtd_enabled and returns ENODEV, so the caller should
be:

 if (!vtd_enabled)
    return -ENODEV;
 rc = vtd_hw_check();
 if ( rc )
    return rc;

Note that the above code skips acpi_dmar_init() entirely if !vtd_enabled.
This behaviour is different from your patch but I think more sensible?

 -- Keir

On 22/9/07 00:39, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:

> This patch disables vt-d for old chipset steppings that does not have
> compatible CPU compatible vt-d page table format.
> 
> Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
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> http://lists.xensource.com/xen-devel



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