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Re: [Qemu-devel] format=raw,readonly errors
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] format=raw,readonly errors |
Date: |
Mon, 8 May 2017 17:00:51 +0100 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
On Mon, May 08, 2017 at 11:32:12AM -0400, John Snow wrote:
>
>
> On 05/08/2017 10:15 AM, Carl Karsten wrote:
> > On Mon, May 8, 2017 at 3:51 AM, Markus Armbruster <address@hidden> wrote:
> >
> >> Carl Karsten <address@hidden> writes:
> >>
> >>> address@hidden:~/temp$ qemu-system-x86_64 -m 256 -display curses -drive
> >>> file=disk.cow -drive file=boot.img
> >>> WARNING: Image format was not specified for 'boot.img' and probing
> >> guessed
> >>> raw.
> >>> Automatically detecting the format is dangerous for raw images,
> >>> write operations on block 0 will be restricted.
> >>> Specify the 'raw' format explicitly to remove the restrictions.
> >>>
> >>> This is OK, as I don't want anything writing to that thing anyway. So to
> >>> get rid of the waring:
> >>>
> >>> address@hidden:~/temp$ qemu-system-x86_64 -drive
> >>> file=boot.img,format=raw,readonly qemu-system-x86_64: Can't use a
> >> read-only
> >>> drive
> >>> qemu-system-x86_64: Initialization of device ide-hd failed: Device
> >>> initialization failed.
> >>
> >> -drive without if=... creates an IDE disk[*]. IDE disks can't do
> >> read-only. Have you tried omitting ",readonly"?
> >>
> >
> >
> > omitting works, but my goal was for the drive to be read only.
> >
> >
>
> I don't think there's a way to make physical IDE drives "read only." I
> don't think there's any jumper settings or any of the like which can
> accomplish this.
You could use an IDE cdrom though, rather than an IDE disk, as that's
readonly from guest POV (we don't emulate a cd-writer).
Regards,
Daniel
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- [Qemu-devel] format=raw,readonly errors, Carl Karsten, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, Markus Armbruster, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, Carl Karsten, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, John Snow, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, Carl Karsten, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, Eric Blake, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, Carl Karsten, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, Eric Blake, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, Eric Blake, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors, Max Reitz, 2017/05/08
- Re: [Qemu-devel] format=raw,readonly errors,
Daniel P. Berrange <=