Re: port-xen/57121: Pure NetBSD PVH guests do not appear to be able to use more than 4GB of memory

[Brad Spencer <brad%anduin.eldar.org@localhost>]

The following reply was made to PR port-xen/57121; it has been noted by GNATS.

From: Brad Spencer <brad%anduin.eldar.org@localhost>
To: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, port-xen-maintainer%netbsd.org@localhost,
        gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: port-xen/57121: Pure NetBSD PVH guests do not appear to be able
 to use more than 4GB of memory
Date: Fri, 23 Dec 2022 12:41:50 -0500

 Manuel Bouyer <bouyer%antioche.eu.org@localhost> writes:
 
 > On Mon, Dec 19, 2022 at 03:20:00PM +0000, brad%anduin.eldar.org@localhost wrote:
 >> With a pure PVH 64bit NetBSD guest using the GENERIC kernel, the guest
 >> does not appear to be able to use more than 4GB of memory.  That is,
 >> no matter how much memory you give the guest the guest caps it at 4GB.
 >> This does not happen with ArchLinux guests on the same DOM0.  The same
 >> guest configured as a PV system with pvshim sees all of the memory.
 >
 > Hello
 > I just commited the attached patch to HEAD; it should apply cleanly to
 > netbsd-10 too. Can you test ?
 > I can't test with much more than 4GB on my devel box (not enough RAM) ...
 
 
 Thanks again.. this appears to have fixed the problem.  I tested with
 8GB and it reported just fine, as did 1GB on a netbsd-10 PVH DOMU using
 the GENERIC kernel.  The patch applied just fine to 10, as you
 mentioned.
 
 
 
 
 -- 
 Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org