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Re: [Xen-devel] fixed location of share info page in HVM guests

  • To: Olaf Hering <olaf@xxxxxxxxx>
  • From: Keir Fraser <keir.xen@xxxxxxxxx>
  • Date: Mon, 22 Oct 2012 13:15:04 +0100
  • Cc: xen-devel@xxxxxxxxxxxxx
  • Delivery-date: Mon, 22 Oct 2012 20:15:43 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>
  • Thread-index: Ac2wkewDsV+KOK3ofUykiE4CsSozdw==
  • Thread-topic: [Xen-devel] fixed location of share info page in HVM guests

On 22/10/2012 19:50, "Olaf Hering" <olaf@xxxxxxxxx> wrote:

>> Okay, that was a bit too clever, trying to hide between IOAPIC and LAPIC
>> pages. How about a bit lower in memory -- FE700000-FE7FFFFF?
>> Everything in range FC000000-FFFFFFFF should already be marked
>> E820_RESERVED. You can test that, and also see
>> tools/firmware/hvmloader/e820.c:build_e820_table() (and note that
>> Can document in hvmloader/config.h and have mem_alloc() test against it
>> rather than hvm_info->reserved_mem_pgstart.
> I came up with this (perhaps whitespace damaged) change, the guest still boots
> ok.
> The asl part is just copy&paste from the HPET part.

Is there any point encoding this in the DSDT? I thought the guest OS needs
to access the shared info area earlier than it is able to decode the DSDT?

 -- Keir

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