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Re: [Xen-devel] [Patch] Make memory hole for PCI Express bigger and prevent roll-over

  • To: David Stone <unclestoner@xxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Mon, 21 Jan 2008 15:07:22 +0000
  • Cc: Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 21 Jan 2008 07:07:51 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AchcPjxVetW/SsgxEdyNvQAX8io7RQAARZYE
  • Thread-topic: [Xen-devel] [Patch] Make memory hole for PCI Express bigger and prevent roll-over

On 21/1/08 14:59, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> wrote:

>> Also should the hole used by the Xen HVM BIOS be limited to
>> 0xF0000000-0xF4FFFFFF rather than 0xF00000000-0xFFFFFFFF?  Because:
>>   - The current DSDT specifies 0xF0000000-0xF4FFFFFF.
> I think this is because it was "big enough" for the Intel engineer who first
> did the Xen ACPI work. There's no reason not to go up to, say, FC000000. We
> can't go all the way to 4GB because there a couple of things up there (at
> least LAPIC and IOAPIC mappings).

Actually, if we do this, will 192MB be enough to be getting along with
anyway, for any devices anyone is currently testing with pass-thru?

Adding the roll-over check is obviously a good idea anyway.

 -- Keir

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