From: Jason Gunthorpe <jgg@nvidia.com>
To: "Gustavo A." <gustavogyn@gmail.com>
Cc: Alex Williamson <alex@shazbot.org>,
Bjorn Helgaas <bhelgaas@google.com>,
kvm@vger.kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 0/1] vfio/pci: Wait for GB202 firmware after reset
Date: Sat, 14 Nov 2026 19:58:28 -0400 [thread overview]
Message-ID: <20261114235828.GF3706007@nvidia.com> (raw)
In-Reply-To: <CAPZV9qUk3-eKOGEjVc7f0QzZcjb3L5QwUceAEUV0nuCdo90eGw@mail.gmail.com>
On Sat, Nov 14, 2026 at 02:48:53AM +0000, Gustavo A. wrote:
> PCI reset returns successfully while the Firmware Security Processor (FSP)
> is still initializing. Restricting BAR1 to 4 KiB mappings masks the problem.
> Waiting for FSP completion after reset restores normal output with stock
> KVM and verified 1 GiB BAR1 mappings.
That doesn't really make any sense, you are probably hitting a race
condition somewhere since 1G/4k changes the timing. And possibly
because your new kernel versions boot VFIO faster than older ones.
IIRC there was some VBIOS bug in old versions that caused issues with
vfio.
VFIO should definately not be doing things like this.
Jason
prev parent reply other threads:[~2026-11-14 23:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-14 2:48 [RFC PATCH 0/1] vfio/pci: Wait for GB202 firmware after reset Gustavo A.
2026-11-14 2:49 ` [RFC PATCH] vfio/pci: Wait for GB202 firmware initialization " Gustavo A.
2026-11-14 23:58 ` Jason Gunthorpe [this message]
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