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Re: [Qemu-devel] Regression opening read-only cdroms
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] Regression opening read-only cdroms |
Date: |
Tue, 16 Jun 2009 18:51:12 +0100 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Avi Kivity wrote:
> On 06/16/2009 06:54 PM, Jamie Lokier wrote:
> >read-only disk images don't make much sense.
> >
> >
> >And yet "chmod 444 image; qemu ..." works.
> >If you're booting from a disk you don't need to write to, obviously.
> >Generally it'll need to be mounted read-only in the guest.
> >
>
> It will eventually fail. Open the ext3 log, update atime, or
> something. The guest expects the disk to be writeable.
No. Obviously if you _want_ to run a guest with the disk mounted
writable, you'll use snapshot=on instead because that's what it's for.
Otherwise, a read-only disk should works fine using virtio/SCSI/USB,
as the guest will mount it read-only, as those interfaces all have a
read-only media flag which Linux guests (at least) look at.
Which is the desired behaviour.
-- Jamie
- Re: [Qemu-devel] Regression opening read-only cdroms, (continued)
- Re: [Qemu-devel] Regression opening read-only cdroms, Stefano Stabellini, 2009/06/16
- Re: [Qemu-devel] Regression opening read-only cdroms, Jamie Lokier, 2009/06/16
- Re: [Qemu-devel] Regression opening read-only cdroms, Avi Kivity, 2009/06/16
- Re: [Qemu-devel] Regression opening read-only cdroms, Jamie Lokier, 2009/06/16
- Re: [Qemu-devel] Regression opening read-only cdroms, Jamie Lokier, 2009/06/16
- Re: [Qemu-devel] Regression opening read-only cdroms, Gerd Hoffmann, 2009/06/16
- Re: [Qemu-devel] Regression opening read-only cdroms, Avi Kivity, 2009/06/17
Re: [Qemu-devel] Regression opening read-only cdroms, Avi Kivity, 2009/06/16
Re: [Qemu-devel] Regression opening read-only cdroms, Richard W.M. Jones, 2009/06/18
Re: [Qemu-devel] Regression opening read-only cdroms, Blue Swirl, 2009/06/16