Re: kern/55667 (regression: XEN3_DOM0 fails to boot on)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, May 23, 2022 at 09:00:02AM +0000, Frank Kardel wrote:
> The following reply was made to PR kern/55667; it has been noted by GNATS.
> 
> From: Frank Kardel <kardel%netbsd.org@localhost>
> To: gnats-bugs%netbsd.org@localhost, jdolecek%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
>  netbsd-bugs%netbsd.org@localhost
> Cc: 
> Subject: Re: kern/55667 (regression: XEN3_DOM0 fails to boot on)
> Date: Mon, 23 May 2022 10:58:11 +0200
> 
>   From the partial dmesg output captures (I need to bump MSGSIZE) I see:
>  
>  [     1.893878] ixg1 at pci16 dev 0 function 1: Intel(R) PRO/10GbE 
>  PCI-Express Network Driver, Version - 4.0.1-k
>  [     1.894043] ixg1: clearing prefetchable bit
>  [     1.894382] ixg1: device X550
>  [     1.163206] ixg1: NVM Image Version 1.93, PHY FW Revision 2.0b ID 
>  0xb, NVM Map version 1.93, OEM NVM Image version 0.04, ETrackID 80000aee
>  [     1.187495] ixg1: PBA number 020C08-0F8
>  [>>> 1.187536] ixg1: autoconfiguration error: failed to allocate MSI-X 
>  interrupt
>  [     1.188286] ixg1: interrupting at ioapic3 pin 30
>  [     1.208223] ixg1: Ethernet address ac:1f:6b:f5:bc:cd
>  [     1.210360] ixg1: PHY: OUI 0x00aa00 model 0x0022, rev. 0
>  [     1.214695] ixg1: PCI Express Bus: Speed 8.0GT/s Width x4
>  [     1.216804] ixg1: feature cap 
>  0x17a0<TEMP_SENSOR,LEGACY_TX,FDIR,MSI,MSIX,LEGACY_IRQ>
>  [     1.216806] ixg1: feature ena 0x1020<TEMP_SENSOR,LEGACY_IRQ>

ixg(4) doens't work in ioapic mode in GENERIC either, it looks like a hardware
limitation (or maybe a driver bug). I tried to disable only MSI-X but this
cause a kernel fault with GENERIC, in the idle loop of a secondary CPU
(so no usefull informations).

I have MSI working with Xen but it needs cleanup before commit.
MSI-X is still not working yet (and ixg is not working with MSI either - all
other devices do work).

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--