Re: [virtio] [PATCH] pci: strengthen requirement of the correct subsystem id

Re: [virtio] [PATCH] pci: strengthen requirement of the correct subsystem id

[Michael S. Tsirkin]

On Mon, Oct 28, 2019 at 12:12:49PM -0400, Michael S. Tsirkin wrote:
> If a hardware implementation of virtio does not have
> the correct subsystem id, then drivers can't report
> ir properly, or detect and work around bugs.
> Change the requirement from MAY to SHOULD.
> 
> We can't make it a MUST since we did not require this
> historically.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Fixes: https://github.com/oasis-tcs/virtio-spec/issues/61

> ---
>  content.tex | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/content.tex b/content.tex
> index 4bcb728..8f1518c 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -562,7 +562,7 @@ \subsection{PCI Device Discovery}\label{sec:Virtio Transport Options / Virtio Ov
>  For example, the network card device with the Virtio Device ID 1
>  has the PCI Device ID 0x1041 or the Transitional PCI Device ID 0x1000.
>  
> -The PCI Subsystem Vendor ID and the PCI Subsystem Device ID MAY reflect
> +The PCI Subsystem Vendor ID and the PCI Subsystem Device ID SHOULD reflect
>  the PCI Vendor and Device ID of the environment (for informational purposes by the driver).
>  
>  Non-transitional devices SHOULD have a PCI Device ID in the range
> -- 
> MST
> 
> 
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