linux-kernel - Re: [PATCH v6 0/5] vfio: handle DMA map/unmap up to the addressable limit

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Message-ID: <aQ1A_XQAyFqD5s77@google.com>
Date: Fri, 7 Nov 2025 00:44:45 +0000
From: David Matlack <dmatlack@...gle.com>
To: Alex Mastro <amastro@...com>
Cc: Alex Williamson <alex@...zbot.org>, Jason Gunthorpe <jgg@...pe.ca>,
	Alejandro Jimenez <alejandro.j.jimenez@...cle.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/5] vfio: handle DMA map/unmap up to the addressable
 limit

On 2025-10-28 09:14 AM, Alex Mastro wrote:

> This series spends the first couple commits making mechanical
> preparations before the fix lands in the third commit. Selftests are
> added in the last two commits.

Hi Alex,

The new unmap_range and unmap_all selftests are failing for me. They all fail
when attempting to map in region at the top of the IOVA address space.

Here's one example:

$ ./run.sh -d 0000:6a:01.0 -- ./vfio_dma_mapping_test -r vfio_dma_map_limit_test.iommufd.unmap_range
+ echo "vfio-pci" > /sys/bus/pci/devices/0000:6a:01.0/driver_override
+ echo "0000:6a:01.0" > /sys/bus/pci/drivers/vfio-pci/bind

TAP version 13
1..1
# Starting 1 tests from 1 test cases.
#  RUN           vfio_dma_map_limit_test.iommufd.unmap_range ...
Driver found: dsa
tools/testing/selftests/vfio/lib/include/vfio_util.h:219: Assertion Failure

  Expression: __vfio_pci_dma_map(device, region) == 0
  Observed: 0xffffffffffffffea == 0
  [errno: 22 - Invalid argument]

# unmap_range: Test failed
#          FAIL  vfio_dma_map_limit_test.iommufd.unmap_range
not ok 1 vfio_dma_map_limit_test.iommufd.unmap_range
# FAILED: 0 / 1 tests passed.
# Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0
+ echo "0000:6a:01.0" > /sys/bus/pci/drivers/vfio-pci/unbind
+ echo "" > /sys/bus/pci/devices/0000:6a:01.0/driver_override

I am testing at the tip of Linus' tree at commit a1388fcb52fc ("Merge tag
'libcrypto-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux").