linux-kernel - Re: [PATCH] vfio/type1: Unpin zero pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <YxFUA1N3athK8iDh@ziepe.ca>
Date:   Thu, 1 Sep 2022 21:53:23 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     David Hildenbrand <david@...hat.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, lpivarc@...hat.com
Subject: Re: [PATCH] vfio/type1: Unpin zero pages

On Tue, Aug 30, 2022 at 05:43:43PM +0200, David Hildenbrand wrote:

> I think one approach is mmap'ing a devdax device. To test without actual
> NVDIMM hardware, there are ways to simulate it even on bare metal using
> the "memmap=" kernel parameter.
> 
> https://nvdimm.wiki.kernel.org/
> 
> Alternatively, you can use an emulated nvdimm device under QEMU -- but
> then you'd have to run VFIO inside the VM. I know (that you know) that
> there are ways to get that working, but it certainly requires more effort :)
> 
> ... let me know if you need any tips&tricks.

currently pin_user_pages will not return ZONE_DEVICE pages anyhow, so
it is not relevant to this snippet

You might seem them on that follow_pfn flow though :\

Jason