From: Jason Gunthorpe <jgg@ziepe.ca>
To: Nazar Mokrynskyi <nazar@mokrynskyi.com>
Cc: kvm@vger.kernel.org, alex.williamson@redhat.com,
linux-pci@vger.kernel.org
Subject: Re: vfio/pci: Qualcomm PCIe WiFi devices drop link during FLR causing host AER crash
Date: Mon, 20 Apr 2026 09:24:44 -0300 [thread overview]
Message-ID: <20260420122444.GN2577880@ziepe.ca> (raw)
In-Reply-To: <70de9b8f-b7c7-481b-8cb1-931e3b82eb0e@mokrynskyi.com>
On Sat, Apr 18, 2026 at 12:24:07AM +0300, Nazar Mokrynskyi wrote:
> Several Qualcomm PCIe WiFi devices drop their PCIe link as part of their
> internal reset sequence. Under bare metal this is transparent because the
> host root complex performs link retraining automatically. Under VFIO
> passthrough, the link-drop generates an uncorrectable AER error that
> escalates through the parent bridge to the host, crashing it.
If AER's crash the system then it is not compatible with VFIO, IMHO.
For VFIO to work as designed the platform must be able to safely
contain all the errors the PCI device can generate.
Jason
next prev parent reply other threads:[~2026-04-20 12:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-17 21:24 vfio/pci: Qualcomm PCIe WiFi devices drop link during FLR causing host AER crash Nazar Mokrynskyi
2026-04-20 12:24 ` Jason Gunthorpe [this message]
2026-04-20 12:44 ` Alex Williamson
2026-04-20 12:49 ` Nazar Mokrynskyi
2026-05-05 10:05 ` Nazar Mokrynskyi
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