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Re: GNTTABOP_setup_table yields -1 PFNs
- To: Taylor R Campbell <riastradh-xen-devel@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Mon, 8 Jul 2024 15:08:31 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 08 Jul 2024 13:08:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08.07.24 14:50, Taylor R Campbell wrote:
Date: Mon, 8 Jul 2024 11:09:21 +0200
From: Jan Beulich <jbeulich@xxxxxxxx>
On 06.07.2024 04:22, Taylor R Campbell wrote:
On a Xen 4.14 host (with extraversion=.0.88.g1d1d1f53), with version 1
grant tables, where GNTTABOP_query_size initially returns nr_frames=32
max_nr_frames=64, a NetBSD guest repeatedly queries
GNTTABOP_setup_table for successively larger nr_frames from 1 up.
First question: Is there some earlier GNTTABOP_setup_table that you invoke?
I'd expect (and also observe) nr_frames=1 initially.
Not that the guest OS invokes. Perhaps the bootloader, pv-grub 0.97,
might invoke GNTTABOP_setup_table? I looked around but couldn't find
an obvious source for pv-grub 0.97.
This is based on Mini-OS, which does GNTTABOP_setup_table with nr_frames=1
Juergen
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