Re: [Qemu-devel] [PATCH] ide: Add resize callback to ide/core

[Stefan Hajnoczi <stefanha@redhat.com>]

[-- Attachment #1: Type: text/plain, Size: 1157 bytes --]

On Tue, Aug 12, 2014 at 02:44:09PM -0400, John Snow wrote:
> Currently, if the block device backing the IDE drive is resized,
> the information about the device as cached inside of the IDEState
> structure is not updated, thus when a guest OS re-queries the drive,
> it is unable to see the expanded size.
> 
> This patch adds a resize callback to correct this, and marks the
> identify buffer cache as being dirty to force ide_identify to
> regenerate this information. This callback also attempts to update
> the legacy CHS values, if only to maintain a sense of
> informational consistency.
> 
> Lastly, a Linux guest as-is cannot resize a libata drive while in-use,
> but it can see the expanded size as part of a bus rescan event.
> This patch also allows guests such as Linux to see the new drive size
> after a soft reboot event, without having to exit the QEMU process.
> 
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  hw/ide/core.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)

Dropped due to comments from Markus Armbruster.  I'll wait until the
discussion is finished before merging it.

[-- Attachment #2: Type: application/pgp-signature, Size: 473 bytes --]