From: Alex Williamson <alex@shazbot.org>
To: Alex Mastro <amastro@fb.com>
Cc: David Matlack <dmatlack@google.com>,
Shuah Khan <shuah@kernel.org>, Jason Gunthorpe <jgg@ziepe.ca>,
<kvm@vger.kernel.org>, <linux-kselftest@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 4/4] vfio: selftests: replace iova=vaddr with allocated iovas
Date: Tue, 11 Nov 2025 10:09:37 -0700 [thread overview]
Message-ID: <20251111100937.4706a54e.alex@shazbot.org> (raw)
In-Reply-To: <20251111-iova-ranges-v2-4-0fa267ff9b78@fb.com>
On Tue, 11 Nov 2025 06:52:05 -0800
Alex Mastro <amastro@fb.com> wrote:
> vfio_dma_mapping_test and vfio_pci_driver_test currently use iova=vaddr
> as part of DMA mapping operations. The assumption that these IOVAs
> are legal has held up on all the hardware we've tested so far, but is
> not guaranteed. Make the tests more robust by using iova_allocator to
> vend IOVAs, which queries legally accessible IOVAs from the underlying
> IOMMUFD or VFIO container.
I've reported hardware that it doesn't work on, QEMU emulates such
hardware. The commit message suggests this is more of a theoretical
problem. Thanks,
Alex
next prev parent reply other threads:[~2025-11-11 17:09 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-11 14:52 [PATCH v2 0/4] vfio: selftests: update DMA mapping tests to use queried IOVA ranges Alex Mastro
2025-11-11 14:52 ` [PATCH v2 1/4] vfio: selftests: add iova range query helpers Alex Mastro
2025-11-11 17:09 ` Alex Williamson
2025-11-11 17:35 ` Alex Mastro
2025-11-11 17:52 ` Alex Williamson
2025-11-11 17:59 ` Alex Mastro
2025-11-11 14:52 ` [PATCH v2 2/4] vfio: selftests: fix map limit tests to use last available iova Alex Mastro
2025-11-11 14:52 ` [PATCH v2 3/4] vfio: selftests: add iova allocator Alex Mastro
2025-11-11 14:52 ` [PATCH v2 4/4] vfio: selftests: replace iova=vaddr with allocated iovas Alex Mastro
2025-11-11 17:09 ` Alex Williamson [this message]
2025-11-11 17:21 ` Alex Mastro
2025-11-11 17:10 ` [PATCH v2 0/4] vfio: selftests: update DMA mapping tests to use queried IOVA ranges Alex Williamson
2025-11-11 17:41 ` David Matlack
2025-11-11 18:49 ` Alex Mastro
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20251111100937.4706a54e.alex@shazbot.org \
--to=alex@shazbot.org \
--cc=amastro@fb.com \
--cc=dmatlack@google.com \
--cc=jgg@ziepe.ca \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=shuah@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox