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From:   Steve deRosier <derosier@gmail.com>
Date:   Thu, 31 Jan 2019 09:16:11 -0800
Message-ID: <CALLGbRJ6ayYMCPvLCriFnLwW2vfy5azOC=yvT6tnHKkCyPWVsQ@mail.gmail.com>
Subject: Re: BCM43602 system freeze with PCI passthrough
To:     James Prestwood <james.prestwood@linux.intel.com>
Cc:     linux-wireless <linux-wireless@vger.kernel.org>
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Sender: linux-wireless-owner@vger.kernel.org
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Hi James,

On Thu, Jan 31, 2019 at 9:08 AM James Prestwood
<james.prestwood@linux.intel.com> wrote:
>
> Hi,
>
> I posted about a month ago about an Ath9k card that was causing my host
> machine to freeze/lock up when doing PCI passthrough into a VM. This
> was resolved by adding:
>
> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0034,
> quirk_no_bus_reset);
>
> to drivers/pci/quirks.c and rebuilding the host kernel.
>
> Original thread:
> https://marc.info/?l=linux-wireless&m=154689580213002&w=2
>
> I am now trying to get this BCM43602 card working under the same
> conditions but again I am seeing the host machine freeze when starting
> the VM. I did try adding a similar line for this card, which actually
> prevented the machine from freezing, but I am seeing this when starting
> the VM:
>

Since you've had the same issue with two totally unrelated cards, I'm
going to suggest that perhaps the issue is not a Linux wireless one.
You see, the only thing in common with those two cards, with different
manufacturers, different drivers, different firmware, is the PCI bus
and how you're using it (PCI passthrough on QEMU). Perhaps it's either
a QEMU or a PCI bus driver issue. Have you brought up the question
with either of those teams?

- Steve