Re: port-xen/56662 (Can't boot on hypervisor that only supports grant table v1)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR port-xen/56662; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: port-xen-maintainer%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
        gnats-admin%netbsd.org@localhost, jdolecek%NetBSD.org@localhost, coypu%sdf.org@localhost
Subject: Re: port-xen/56662 (Can't boot on hypervisor that only supports
 grant table v1)
Date: Mon, 24 Jan 2022 11:56:18 +0100

 On Mon, Jan 24, 2022 at 01:24:48AM +0000, jdolecek%NetBSD.org@localhost wrote:
 > Synopsis: Can't boot on hypervisor that only supports grant table v1
 > 
 > State-Changed-From-To: open->closed
 > State-Changed-By: jdolecek%NetBSD.org@localhost
 > State-Changed-When: Mon, 24 Jan 2022 01:24:48 +0000
 > State-Changed-Why:
 > This won't be chnaged, v2 is required.
 > Since the grant system is central to proper memory management, it's
 > extremely bad idea to maintain compatibility with the legacy v1 interface,
 > which would only be used in extremely rare cases.
 > AFAIK v2 can be turned off in Dom0 for DomUs, ask them to allow v2.
 
 unforntunably that's not quite true. Newer Xen version removed PV support
 from the hypervisor for x86-32 and supports it only via pvshim (and it's
 recommended to do so for older versions as well). So I fear that we'll
 have to get back v1 support, in addition to v2.
 
 Linux supports both.
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --