Re: [Xen-devel] [PATCH] docs: document old SUSE/Novell unplug for HVM

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 6 Sep 2016, Konrad Rzeszutek Wilk wrote:
> On Fri, Sep 02, 2016 at 11:32:55AM +0200, Olaf Hering wrote:
> > Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> 
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> 
> And if nobody complains I will commit it in 'staging' in a day or so.

Looks good to me too.


> P.S.
> I couldn't actually find it - but is there an spec for what the BARs
> in the Xen Platform PCI device should have?

I think that all the documentation we have is in this file.


> > ---
> >  docs/misc/hvm-emulated-unplug.markdown | 24 ++++++++++++++++++++++++
> >  1 file changed, 24 insertions(+)
> > 
> > diff --git a/docs/misc/hvm-emulated-unplug.markdown 
> > b/docs/misc/hvm-emulated-unplug.markdown
> > index c6d1f9b..70fb024 100644
> > --- a/docs/misc/hvm-emulated-unplug.markdown
> > +++ b/docs/misc/hvm-emulated-unplug.markdown
> > @@ -70,3 +70,27 @@ xen/include/public/hvm/pvdrivers.h.
> >  NOTE: The IO ports implementing the unplug protocol are implemented
> >  as part of the Xen Platform PCI Device, so if that device is not
> >  present in the system then this protocol will not work.
> > +
> > +
> > +Unplug protocol for old SUSE PVonHVM
> > +
> > +During xen-3.0.4 timeframe an unofficial unplug protocol was added to
> > +the xen-platform-pci kernel module. The value 0x1 was written to offset
> > +0x4 in the memory region of the Xen Platform PCI Device. This was done
> > +unconditionally. The corresponding code in qemu-xen-traditional did an
> > +unplug of all NIC, IDE and SCSI devices. This was used in all SUSE
> > +releases up to openSUSE 12.3, SLES11SP3. Starting with openSUSE 13.1 and
> > +SLES11SP4/SLE12 the official protocol was used.
> > +
> > +Unplug protocol for old Novell VMDP
> > +
> > +During Xen-3.0 timeframe an unofficial unplug protocol was used in
> > +Novells VMDP. Depending on how VMDP was configured it would control all
> > +devices, or either NIC or storage. To control all devices the value 0x1
> > +was written to offset 0x4 in the memory region of the Xen Platform PCI
> > +Device. This was supposed to unplug NIC, IDE and SCSI devices. If VMDP
> > +was configured to control just NIC devices it would write the value 0x1
> > +to offset 0x8. If VMDP was configured to control just storage devices it
> > +would write the value 0x2 to offset 0x8. Starting with VMDP version 1.7
> > +(released 2011) the official protocol was used.
> > +
> 

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