WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] [PATCH] qemu-xen-3.4-testing: Fix read-only image file h

To: Michal Novotny <minovotn@xxxxxxxxxx>, Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] [PATCH] qemu-xen-3.4-testing: Fix read-only image file handling
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 4 Jun 2010 14:11:29 +0100
Cc: "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Fri, 04 Jun 2010 06:13:18 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4C08F90B.2020205@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcsD5gJouSdMPzBvQfqs1bA6+1fqKwAAW9LM
Thread-topic: [Xen-devel] [PATCH] qemu-xen-3.4-testing: Fix read-only image file handling
User-agent: Microsoft-Entourage/12.24.0.100205
You need to bring your qemu repo up to date. Throw it away, or go into it
and 'git pull -a'.

 -- Keir

On 04/06/2010 14:00, "Michal Novotny" <minovotn@xxxxxxxxxx> wrote:

> Well, now the kernel is booting but when I'm trying to recompile tools
> and stubdom images it's not OK returning those errors:
> 
> ...
> qemu successfuly configured for Xen qemu-dm build
> make -C ioemu-dir install
> === PCI passthrough capability has been enabled ===
> make[3]: Entering directory
> `/home2/shared/xen-unstable.hg/tools/ioemu-remote'
> === PCI passthrough capability has been enabled ===
> === PCI passthrough capability has been enabled ===
> make[4]: Entering directory
> `/home2/shared/xen-unstable.hg/tools/ioemu-remote/i386-dm'
> CC i386-dm/vl.o
> /home2/shared/xen-unstable.hg/tools/ioemu-dir/vl.c: In function ?main¹:
> /home2/shared/xen-unstable.hg/tools/ioemu-dir/vl.c:5729: warning:
> implicit declaration of function ?dma_helper_init¹
> /home2/shared/xen-unstable.hg/tools/ioemu-dir/vl.c:5731: error: too few
> arguments to function ?xc_interface_open¹
> make[4]: *** [vl.o] Error 1
> make[4]: Leaving directory
> `/home2/shared/xen-unstable.hg/tools/ioemu-remote/i386-dm'
> make[3]: *** [subdir-i386-dm] Error 2
> make[3]: Leaving directory
> `/home2/shared/xen-unstable.hg/tools/ioemu-remote'
> make[2]: *** [subdir-install-ioemu-dir] Error 2
> make[2]: Leaving directory `/home2/shared/xen-unstable.hg/tools'
> make[1]: *** [subdirs-install] Error 2
> make[1]: Leaving directory `/home2/shared/xen-unstable.hg/tools'
> make: *** [install-tools] Error 2
> #
> 
> The command I used for compilation is `make install-xen && make
> install-tools && make install-stubdom && make install-docs` on the
> latest updated xen-unstable staging mercurial tree so I need to
> investigate this further. Nevertheless, the dom0 2.6.31.13 is booting on
> RHEL-5 which is good. That links you gave me Pasi helped, thanks! Now I
> need to resolve those tools issues.
> 
> Michal
> 
> On 06/04/2010 12:57 PM, Michal Novotny wrote:
>> On 06/04/2010 12:42 PM, Pasi Kärkkäinen wrote:
>>> On Fri, Jun 04, 2010 at 11:37:51AM +0200, Michal Novotny wrote:
>>>> Oh, one more thing I've discovered now. Since the codebase for
>>>> qemu-xen-unstable is looking the same like for qemu-xen-3.4-testing and
>>>> the patch is applicable without any modifications it could be working
>>>> for xen-4.1 unstable as well, unfortunately I was not able to boot
>>>> PVOPS
>>>> kernel since it always ends up in kernel panic, maybe the missing
>>>> drivers or something like that.
>>>> 
>>> What kernel version? Did you use xen/stable-2.6.32.x branch from
>>> xen.git?
>> 
>> It's the one that's being automatically downloaded from git as
>> linux-2.6-pvops.git. The URL is
>> git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git with the
>> "fetch" being set to "+refs/heads/*:refs/remotes/xen/*". This is the
>> .git/config automatically created by `make world` in xen-unstable tree:
>> 
>> [core]
>> repositoryformatversion = 0
>> filemode = true
>> bare = false
>> logallrefupdates = true
>> [remote "xen"]
>> url = git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git
>> fetch = +refs/heads/*:refs/remotes/xen/*
>> [branch "xen/stable-2.6.31.x"]
>> remote = xen
>> merge = refs/heads/xen/stable-2.6.31.x
>> 
>> By default it's using uhci-hcd/ehci-hcd and ohci-hcd as builtins but I
>> needed to change it to be modules since otherwise it's being stuck.
>> I'm trying this on RHEL-5 dom0 (I'm having second partition RHEL-5
>> with upstream xen).
>>> See my example .config files from:
>>> http://wiki.xensource.com/xenwiki/XenParavirtOps in the
>>> "troubleshooting" section.
>> 
>> I'll have a look, thanks for the link.
>> 
>>> Works on F12/F13 dom0's.
>>> 
>>> For el5 dom0 you might need these:
>>> http://wiki.xensource.com/xenwiki/2.6.18-to-2.6.31-and-higher
>> 
>> Oh, ok, this may be very useful since I'm trying this on RHEL-5. Thanks!
>> 
>>> aka
>>> CONFIG_SYSFS_DEPRECATED=y
>>> CONFIG_SYSFS_DEPRECATED_V2=y
>>> 
>>> Also atm I think you need CONFIG_XEN_XENBUS_FRONTEND=y in the .config
>>> because of the recently added pv-on-hvm drivers (you'll get build
>>> failure without that option),
>>> so you need XEN_PCIDEV_FRONTEND XEN_BLKDEV_FRONTEND or
>>> XEN_NETDEV_FRONTEND or XEN_FBDEV_FRONTEND needs to be =y.
>>> 
>> 
>> Great! Thanks for your help Pasi! If anything I'll let you know.
>> 
>> Michal
>> 
>>> -- Pasi
>>> 
>>> 
>>>> On 06/03/2010 04:12 PM, Michal Novotny wrote:
>>>>> Oh, just one more thing that should be mentioned:
>>>>> 
>>>>> When you want to mount an image that is set as read-only in the domain
>>>>> configuration file but you omit to set mode to read-only it results
>>>>> into I/O errors when processing the requests. Remounting as read-only
>>>>> or unmounting and remounting using the `mount /dev/* /path/to/mount -o
>>>>> ro` shall do the mounting the correct way, i.e. with no I/O errors, so
>>>>> make sure you mount those disks as read-only otherwise you can be
>>>>> getting errors like:
>>>>> 
>>>>> end_request: I/O error, dev hdb, sector 52
>>>>> 
>>>>> Buffer I/O error on device hdb1, logical block 1
>>>>> 
>>>>> lost page write due to I/O error on hdb1
>>>>> 
>>>>> 
>>>>> and for IDE devices you'll be getting several additional DeviceFault
>>>>> errors since mounting the device read-write (default setting) writes
>>>>> some data onto a disk at the mount-time.
>>>>> 
>>>>> Michal
>>>>> 
>>>>> On 06/03/2010 04:04 PM, Michal Novotny wrote:
>>>>>> [Well, I did send an e-mail to the list using git but it's not here
>>>>>> so I'm forwarding the e-mail to the list for sure:]
>>>>>> 
>>>>>> Hi,
>>>>>> this is the patch for qemu-xen-3.4-testing to fix the read-only
>>>>>> image file handling since the image file was always treated as
>>>>>> read-write which means that all the HVM guests were able to
>>>>>> write to all the disk images available in domain configuration
>>>>>> file no matter what the mode of the image was defined. This
>>>>>> patch fixes this functionality to honor the O_RDONLY in the
>>>>>> BDRV_O_ACCESS flag in block.c and also fixes the IDE and SCSI
>>>>>> interfaces that uses it.
>>>>>> 
>>>>>> It's been tested on RHEL-5 with xen-3.4-testing version of
>>>>>> upstream xen with xen-3.4-testing qemu implementation.
>>>>>> 
>>>>>> For SCSI devices the DATA PROTECT request sense has been added
>>>>>> as found at: http://en.wikipedia.org/wiki/SCSI_Request_Sense_Command
>>>>>> 
>>>>>> file no matter what the mode of the image was defined. This
>>>>>> patch fixes this functionality to honor the O_RDONLY in the
>>>>>> BDRV_O_ACCESS flag in block.c and also fixes the IDE and SCSI
>>>>>> interfaces that uses it.
>>>>>> 
>>>>>> It's been tested on RHEL-5 with xen-3.4-testing version of
>>>>>> Michal
>>>>>> 
>>>>>> Signed-off-by: Michal Novotny<minovotn@xxxxxxxxxx>
>>>>>> 
>>>>>> 
>>>>>> _______________________________________________
>>>>>> Xen-devel mailing list
>>>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>>>> http://lists.xensource.com/xen-devel
>>>>> 
>>>> 
>>>> -- 
>>>> Michal Novotny<minovotn@xxxxxxxxxx>, RHCE
>>>> Virtualization Team (xen userspace), Red Hat
>>>> 
>>>> 
>>>> _______________________________________________
>>>> Xen-devel mailing list
>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>> http://lists.xensource.com/xen-devel
>> 
>> 
> 



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>