Re: [dpdk-dev] [PATCH v2] eal: enable vfio independent of no PCI flag

[Thomas Monjalon <thomas@monjalon.net>]

10/10/2017 15:46, Hemant Agrawal:
> Hi Thomas, Anatoly,
> 
> On 10/7/2017 5:07 PM, Thomas Monjalon wrote:
> > 07/10/2017 13:20, Hemant Agrawal:
> >> In case no_pci is configured, other buses e.g. fslmc bus will
> >> still need the the vfio to be enabled.
> >>
> >> Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
> >> ---
> >> v2: enabled VFIO, independent of no-pci flag as suggested by Thomas
> > [...]
> >> --- a/lib/librte_eal/linuxapp/eal/eal.c
> >> +++ b/lib/librte_eal/linuxapp/eal/eal.c
> >> @@ -733,10 +733,8 @@ static int rte_eal_vfio_setup(void)
> >>  {
> >>  	int vfio_enabled = 0;
> >>
> >> -	if (!internal_config.no_pci) {
> >> -		pci_vfio_enable();
> >> -		vfio_enabled |= pci_vfio_is_enabled();
> >> -	}
> >> +	pci_vfio_enable();
> >> +	vfio_enabled |= pci_vfio_is_enabled();
> >
> > You are enabling vfio_pci.
> > This part could stay conditionned by no_pci.
> >
> > I was thinking you need vfio without vfio_pci. Am I right?
> 
> yes
> > If yes, I suggest to enable only vfio root module.
> >
> 
> vfio_enable should be done only once. So, if I enable it for "vfio", 
> pci_vfio_enable is not required.
> In any case it is not storing any PCI specific data and there are no 
> error checks here of "vfio_pci" enable failure.
> 
> So, if we use,
> 	vfio_enable("vfio");
> 	vfio_enabled |= vfio_is_enabled("vfio");
> 
> It seems no_pci check will not have any value.
> 
> let me know your thoughts?

I don't know the code managing VFIO.
Anatoly, please can you help meeting the requirement of
VFIO always enabled?