Re: [Qemu-devel] [PATCH v13 09/13] add check reset mechanism when hotplug vfio device

[Alex Williamson]

On Mon, 2015-11-16 at 18:18 +0800, Chen Fan wrote:
> Hi Alex,
> 
>    Thanks for your detailed explanation.
>    during my test, I found that maybe there was another problem in vfio 
> driver,
> I use a dual-port NIC which address are: 06:00.0 and 06:00.1 two functions.
> then I use aer-inject to inject one error to one function like following:
> AER
> ID 0000:06:00.0
> UNCOR_STATUS DLP
> HEADER_LOG 0 1 2 3
> 
> here I boot qemu with one enable aer, one disable aer:
> ./x86_64-softmmu/qemu-system-x86_64 -M q35 -device 
> ioh3420,bus=pcie.0,addr=1c.0,port=1,id=bridge1,chassis=1
>   -device vfio-pci,host=06:00.1,bus=bridge1,addr=00.1
>   -device 
> vfio-pci,host=06:00.0,bus=bridge1,addr=00.0,aer=true,multifunction=on
> 
> so we expected that the error only sent to the vfio device with host 
> address is 06:00.0,
> but I found that all devices (06:00.0 , 06:00.1) receive the signal in 
> qemu, which sent by vfio driver
> in vfio_pci_aer_err_detected. then qemu stopped by the device with 
> 06:00.1 received the signal.
> is that right?

You would need to know whether the response for the injected AER affects
all devices on the link or is isolated to the function specified.  VFIO
is just a passthrough for pci_error_handlers, so if error_detected is
getting called for each host device, it's going to signal each device to
the user.  Thanks,

Alex