Re: [win-pv-devel] Next signed release - support for readonly disks?

[Owen Smith <owen.smith@xxxxxxxxxx>]

This fix was unintended - and it does seem possible to boot with read-only 
non-boot disks attached. It's not a fully tested setup, and the frontend offers 
no protection against writes to read only disks, so the results are undefined

Owen

> -----Original Message-----
> From: Paul Durrant
> Sent: 17 October 2017 09:47
> To: 'Chris McClymont' <chris@xxxxxxxxxxxx>; win-pv-
> devel@xxxxxxxxxxxxxxxxxxxx
> Cc: Owen Smith <owen.smith@xxxxxxxxxx>
> Subject: RE: [win-pv-devel] Next signed release - support for readonly disks?
> 
> > -----Original Message-----
> > From: win-pv-devel [mailto:win-pv-devel-bounces@xxxxxxxxxxxxxxxxxxxx]
> > On Behalf Of Chris McClymont
> > Sent: 14 October 2017 02:19
> > To: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> > Subject: [win-pv-devel] Next signed release - support for readonly disks?
> >
> > Hi everyone,
> >
> > Support for readonly disks was fixed in xenvbd commit
> > 3bb41b49ff66433ab5ebb5d36d24946f40390d7c. When is this likely to make
> > it into a signed release?
> >
> >
> > I'm working on Windows templates for Xen and would love to use the
> > newer Xen Project drivers signed by the Linux Foundation, rather than
> > the EJB Digital or others floating around. But I have a requirement to
> > support readonly disks, which don't work in the 8.2.0 release.
> > Readonly disks appear in device manage only when emulated, and
> > disappear (even with Show Hidden Devices) after the PV drivers are
> > installed.
> >
> > The commit I mentioned is somewhere between 8.2.0 and master.
> > Previously, pdo.c would set ScsiStatus to SCSI_ABORT if
> > (DiskInfo->DiskInfo & VDISK_READONLY). Now, pdo.c is called target.c
> > and the commit removes the readonly limitation.
> >
> 
> Hi Chris,
> 
> Owen may have more to say, but I assume this was an unintended
> consequence of the patch.
> 
> In my experience an NTFS filesystem requires a disk to be read/write
> otherwise it will not function... certainly this is true of a system disk. 
> Are you
> using a different filesystem? TBH I think it's quite reasonable for Windows to
> assume that a non-removable medium calling itself is a disk is read/write.
> 
> > I'm wondering a few things:
> >   1) When is this commit likely to make it into a signed release
> 
> It's not currently a back-port candidate and there is no firm timeline for
> releasing 9.0 drivers.
> 
> >   2) Is there a roadmap? I.e. How is it decided when to make releases
> > and which features/fixes to include
> 
> Because the Xen Project does not have dedicated infrastructure for testing
> the PV drivers, we generally rely on the testing done by Citrix XenServer and
> therefore releases tend to be aligned with updates made to the Citrix
> branded variant of the drivers.
> 
> >   3) How can I search this mailing list? It doesn't seem to be
> > included on http://xen.markmail.org/search/
> >
> 
> You can see the mailing list archives at
> https://lists.xenproject.org/archives/html/win-pv-devel. As for searching via
> markmail... I have requested that the list be added in the past, but I'll have
> another go.
> 
> Cheers,
> 
>   Paul
> 
> > Thanks,
> > Chris McClymont
> >
> > _______________________________________________
> > win-pv-devel mailing list
> > win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> > https://lists.xenproject.org/cgi-bin/mailman/listinfo/win-pv-devel
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