Re: [PATCH 2/6] PCI/VPD: Remove struct pci_vpd_ops

On Wed, 11 Aug 2021 23:43:43 +0000
"Rustad, Mark D" [off-list ref] wrote:

at 3:00 PM, Bjorn Helgaas [off-list ref] wrote:

quoted

So I wonder if we should just disallow VPD access for these NICs
except on function 0.  There was a little bit of discussion in that
direction at [2].  

If this is done, you'll have to be sure that any non-0 functions assigned  
to guests (which will appear as function 0 to the guest!) does not appear  
to have VPD and block access to those resources. That seems kind of messy,  
but should work. One hopes that no guest drivers are hard-wired to assume  
VPD presence based on the device type.

A bit messy, yes.  But if we're saying VPD is not essential for
operation in the VM, I'd rather we mask it on all functions rather than
create scenarios where different identical functions produce different
userspace results.  Thanks,

Alex