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Re: xen_pciback: error enabling MSI-X / MSI for guest -- WAS: Re: Kernel panic when passing through 2 identical PCI devices
- To: "J. Roeleveld" <joost@xxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 23 Jun 2025 09:55:46 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 23 Jun 2025 07:55:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.06.2025 16:39, J. Roeleveld wrote:
> I managed to get past the kernel panic (sort of) by doing the following:
>
> 1) Ensure system is fully OFF before booting. A reset/reboot will cause these
> errors.
>
> 2) Fix the BIOS config to ensure the PCI-ports are split correctly. If anyone
> has a Supermicro board and gets errors about PCI-slots not getting full speed
> let me know.
>
> Not entirely convinced the 2nd was part of the cause, but that's ok.
>
> I now, however, get a new error message in the Domain0 dmesg:
> pciback <pci-address>: xen_map irq failed -28 for <domid> domain
> pciback <pci-address>: error enabling MSI-X for guest <domid>: err -28!
>
> For the NVMe devices, I get these twice, with the 2nd time complaining about
> MSI (without the -X)
>
> I feel there is something missing in my kernel-config and/or domain config.
> If anyone can point me at what needs to be enabled/disabled or suggestions on
> what I can try?
The default number of extra IRQs the guest may (have) set up may be too small.
You may need to make use of Xen's extra_guest_irqs= command line option.
Jan
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