linux-kernel - Re: [PATCH v2 3/3] vfio: selftests: Add vfio_dma_mapping_mmio

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Message-ID: <aWfXzwN4RCSsuF3u@google.com>
Date: Wed, 14 Jan 2026 17:52:15 +0000
From: David Matlack <dmatlack@...gle.com>
To: Alex Mastro <amastro@...com>
Cc: Alex Williamson <alex@...zbot.org>, Shuah Khan <shuah@...nel.org>,
	Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
	Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH v2 3/3] vfio: selftests: Add vfio_dma_mapping_mmio_test

On 2026-01-13 03:08 PM, Alex Mastro wrote:

> +FIXTURE_SETUP(vfio_dma_mapping_mmio_test)
> +{
> +	self->iommu = iommu_init(variant->iommu_mode);
> +	self->device = vfio_pci_device_init(device_bdf, self->iommu);
> +	self->iova_allocator = iova_allocator_init(self->iommu);
> +	self->bar = largest_mapped_bar(self->device);
> +
> +	if (!self->bar)
> +		SKIP(return, "No mappable BAR found on device %s", device_bdf);
> +
> +	if (self->bar->info.size < 2 * getpagesize())
> +		SKIP(return, "BAR too small (size=0x%llx)", self->bar->info.size);

It seems like the selftest should only skip map_partial_bar if the BAR
is less than 2 pages. map_full_bar would still be a valid test to run.