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Re: [PATCH v2 7/7] xen: tolerate ACPI NVS memory overlapping with Xen allocated memory
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Tue, 10 Sep 2024 10:16:15 +0200
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- Delivery-date: Tue, 10 Sep 2024 08:16:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.08.24 12:23, Jan Beulich wrote:
On 20.08.2024 10:20, Juergen Gross wrote:
In order to minimize required special handling for running as Xen PV
dom0, the memory layout is modified to match that of the host. This
requires to have only RAM at the locations where Xen allocated memory
is living. Unfortunately there seem to be some machines, where ACPI
NVS is located at 64 MB, resulting in a conflict with the loaded
kernel or the initial page tables built by Xen.
As ACPI NVS needs to be accessed by the kernel only for saving and
restoring it across suspend operations, it can be relocated in the
dom0's memory map by swapping it with unused RAM (this is possible
via modification of the dom0 P2M map).
Shouldn't this paragraph be amended / re-written, as this was what made
me ask for what is now patch 6?
Oh, indeed.
Juergen
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