* Stefan Hajnoczi () wrote:
> On Fri, Jan 11, 2019 at 11:42:00AM +0000, Dr. David Alan Gilbert (git) wrote:
> > diff --git a/content.tex b/content.tex
> > index 776162a..e2435ff 100644
> > --- a/content.tex
> > +++ b/content.tex
> > @@ -1641,6 +1641,33 @@ All register values are organized as Little Endian.
> > selected by writing to \field{QueueSel}.
> > }
> > \hline
> > + \mmioreg{SHMSel}{Shared memory region select}{0x0b0}{W}{%
> > + Writing to this register selects the shared memory region \ref{sec:Basic Facilities of a Virtio Device / Shared Memory Regions}
> > + following operations on \field{SHMId}, \field{SHMLenLow}, \field{SHMLenHigh},
> > + \field{SHMBaseLow} and \field{SHMBaseHigh} apply to. The index
> > + number of the first region is zero (0x0); note that it is a
> > + simple index that does not correspond to the \field{id}.
>
> Why use a separate virtio-mmio index instead of the shared memory ID?
> The driver would map those IDs it knows about, so I'm not sure if
> enumerating them via a separate index is useful. Plus using the ID lets
> you drop one register from the interface.
Yes, I think if we don't need enumeration that's right; we just shange
SHMId to be the writeable register and drop the SHMSel register.
Dave
--
Dr. David Alan Gilbert / / Manchester, UK
