linux-kernel - Re: [PATCH v2 00/18] vfio: selftests: Support for multi-device tests

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Message-ID: <aRUFGHPe+EXao10B@devgpu015.cco6.facebook.com>
Date: Wed, 12 Nov 2025 14:07:20 -0800
From: Alex Mastro <amastro@...com>
To: David Matlack <dmatlack@...gle.com>
CC: Alex Williamson <alex.williamson@...hat.com>,
        Alex Williamson
	<alex@...zbot.org>, Jason Gunthorpe <jgg@...dia.com>,
        Josh Hilke
	<jrhilke@...gle.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        Raghavendra Rao Ananta
	<rananta@...gle.com>,
        Vipin Sharma <vipinsh@...gle.com>
Subject: Re: [PATCH v2 00/18] vfio: selftests: Support for multi-device tests

On Wed, Nov 12, 2025 at 07:22:14PM +0000, David Matlack wrote:
> This series adds support for tests that use multiple devices, and adds
> one new test, vfio_pci_device_init_perf_test, which measures parallel
> device initialization time to demonstrate the improvement from commit
> e908f58b6beb ("vfio/pci: Separate SR-IOV VF dev_set").

The new test runs and passes for me.

Tested-by: Alex Mastro <amastro@...com>

$ vfio_pci_device_init_perf_test $(readlink -f /sys/class/vfio-dev/*/../.. | xargs -n1 basename)
Testing parallel initialization of 24 devices:
    0000:05:00.0
    0000:06:00.0
    0000:27:00.0
    0000:28:00.0
    0000:e5:00.0
    0000:e6:00.0
    0000:e7:00.0
    0000:e8:00.0
    0000:e9:00.0
    0000:ea:00.0
    0000:c5:00.0
    0000:c6:00.0
    0000:07:00.0
    0000:c7:00.0
    0000:c8:00.0
    0000:c9:00.0
    0000:ca:00.0
    0000:08:00.0
    0000:09:00.0
    0000:0a:00.0
    0000:23:00.0
    0000:24:00.0
    0000:25:00.0
    0000:26:00.0
TAP version 13
1..5
# Starting 5 tests from 5 test cases.
#  RUN           vfio_pci_device_init_perf_test.vfio_type1_iommu.init ...
Wall time: 1.440004083s
Min init time (per device): 1.236283226s
Max init time (per device): 1.440002010s
Avg init time (per device): 1.258762246s
#            OK  vfio_pci_device_init_perf_test.vfio_type1_iommu.init
ok 1 vfio_pci_device_init_perf_test.vfio_type1_iommu.init
#  RUN           vfio_pci_device_init_perf_test.vfio_type1v2_iommu.init ...
Wall time: 1.448952696s
Min init time (per device): 1.242623358s
Max init time (per device): 1.448951915s
Avg init time (per device): 1.264836317s
#            OK  vfio_pci_device_init_perf_test.vfio_type1v2_iommu.init
ok 2 vfio_pci_device_init_perf_test.vfio_type1v2_iommu.init
#  RUN           vfio_pci_device_init_perf_test.iommufd_compat_type1.init ...
Wall time: 1.446931666s
Min init time (per device): 1.242316634s
Max init time (per device): 1.446927360s
Avg init time (per device): 1.264904097s
#            OK  vfio_pci_device_init_perf_test.iommufd_compat_type1.init
ok 3 vfio_pci_device_init_perf_test.iommufd_compat_type1.init
#  RUN           vfio_pci_device_init_perf_test.iommufd_compat_type1v2.init ...
Wall time: 1.449211729s
Min init time (per device): 1.243377853s
Max init time (per device): 1.449211729s
Avg init time (per device): 1.264266785s
#            OK  vfio_pci_device_init_perf_test.iommufd_compat_type1v2.init
ok 4 vfio_pci_device_init_perf_test.iommufd_compat_type1v2.init
#  RUN           vfio_pci_device_init_perf_test.iommufd.init ...
Wall time: 1.447583702s
Min init time (per device): 1.241216318s
Max init time (per device): 1.447582350s
Avg init time (per device): 1.264159293s
#            OK  vfio_pci_device_init_perf_test.iommufd.init
ok 5 vfio_pci_device_init_perf_test.iommufd.init
# PASSED: 5 / 5 tests passed.
# Totals: pass:5 fail:0 xfail:0 xpass:0 skip:0 error:0