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From: Keir Fraser <keir@xensource.com>
To: Gerd Hoffmann <kraxel@suse.de>, Markus Armbruster <armbru@redhat.com>
Cc: Xen devel list <xen-devel@lists.xensource.com>
Subject: Re: 32-on-64: pvfb issue
Date: Thu, 18 Jan 2007 18:31:39 +0000	[thread overview]
Message-ID: <C1D56D8B.7D71%keir@xensource.com> (raw)
In-Reply-To: <45AF93A7.50107@suse.de>

On 18/1/07 15:35, "Gerd Hoffmann" <kraxel@suse.de> wrote:

>> Excuse my ignorance, but why do you have to guess the guest's size?
>> Doesn't dom0 know?
> 
> No, right now there is no hypercall to get that information.  Which
> brings the discussion back onto the table:  Should we add one?  pvfb
> isn't the only driver with that kind of problems.
> 
> And it better shouldn't be a dom0-only hypercall, otherwise driver
> domains will not be able to use it ...

Do the same as you did with blkback. Add a protocol version or bitwidth
field to xenstore. Update frontend driver to write that field. Make tools
write a default value for pv guests for backward compat. This is even better
than with blkfront/blkback because there are definitely no PV-on-HVM pvfb
driver frontends out in the wild (and it's HVM that makes things harder).

Speaking of which, we should add the protocol/bitwidth field to blkfront
asap...

 -- Keir

  parent reply	other threads:[~2007-01-18 18:31 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-18 13:57 32-on-64: pvfb issue Gerd Hoffmann
2007-01-18 14:07 ` Keir Fraser
2007-01-18 15:00 ` Markus Armbruster
2007-01-18 15:35   ` Gerd Hoffmann
2007-01-18 15:53     ` Daniel P. Berrange
2007-01-18 16:34       ` Gerd Hoffmann
2007-01-18 16:55         ` Gerd Hoffmann
2007-01-18 17:05         ` Daniel P. Berrange
2007-01-18 18:31     ` Keir Fraser [this message]
2007-01-19  9:46       ` Gerd Hoffmann
2007-01-19  9:54       ` Gerd Hoffmann
2007-01-19 10:31         ` Markus Armbruster
2007-01-19 10:46           ` Gerd Hoffmann
2007-01-19 11:53             ` Markus Armbruster
2007-01-19 11:10         ` Keir Fraser
2007-01-19 11:43           ` Gerd Hoffmann
2007-01-19 12:01             ` Keir Fraser
2007-01-19 12:59               ` Gerd Hoffmann
2007-01-19 13:45                 ` Keir Fraser
2007-01-19 15:08                   ` Gerd Hoffmann
2007-01-19 15:22                     ` Keir Fraser
2007-01-19 15:31                       ` Gerd Hoffmann
2007-01-19 16:05                         ` Keir Fraser
2007-01-20  0:09                           ` [Patch] [VTPM_TOOLS] Add HVM support to vtpm_manager Scarlata, Vincent R
2007-01-22  7:50                           ` 32-on-64: pvfb issue Gerd Hoffmann
2007-01-22 14:01                             ` Gerd Hoffmann
2007-01-22 14:48                               ` Keir Fraser
2007-01-23 12:53                                 ` Gerd Hoffmann
2007-01-23 15:07                                   ` Keir Fraser
2007-01-23 15:56                                     ` Gerd Hoffmann
2007-01-24 11:23                                   ` Gerd Hoffmann
2007-01-24 12:02                                     ` Keir Fraser
2007-01-24 12:24                                     ` Markus Armbruster
2007-01-24 12:38                                       ` Gerd Hoffmann
2007-01-24 14:24                                         ` Markus Armbruster
2007-01-24 15:25                                           ` Gerd Hoffmann
2007-01-25 13:16                                   ` 32-on-64 broken in unstable Gerd Hoffmann
2007-01-25 13:25                                     ` Keir Fraser
2007-01-25 13:34                                       ` Gerd Hoffmann
2007-01-22 15:22                               ` 32-on-64: pvfb issue Markus Armbruster
2007-01-22 15:33                                 ` Gerd Hoffmann
2007-01-22 15:40                                   ` Keir Fraser
2007-01-19 16:06                         ` Markus Armbruster
2007-01-22  7:56                           ` Gerd Hoffmann
2007-01-19 10:43       ` Ian Campbell
2007-01-19 12:03         ` Markus Armbruster
2007-01-22 18:32       ` Does vt-x itself have perf. impact on Hypervisor w/o considering HVM? Liang Yang
2007-01-23 10:05         ` [Xen-users] " Petersson, Mats
2007-01-23 16:15           ` Liang Yang
2007-01-23 16:33             ` Petersson, Mats

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