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From: Markus Armbruster <armbru@redhat.com>
References: <cd5f9f1eb8708c093c922663adbdaf38e475d60d.1303127142.git.amit.shah@redhat.com>
Date: Mon, 18 Apr 2011 15:26:15 +0200
In-Reply-To: <cd5f9f1eb8708c093c922663adbdaf38e475d60d.1303127142.git.amit.shah@redhat.com>
	(Amit Shah's message of "Mon, 18 Apr 2011 17:15:46 +0530")
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Subject: Re: [Qemu-devel] [PATCH] atapi: Add 'medium ready' to 'medium not
	ready' transition on cd change
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To: Amit Shah <amit.shah@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>, Jes Sorensen <Jes.Sorensen@redhat.com>, qemu list <qemu-devel@nongnu.org>, Juan Quintela <quintela@redhat.com>

Amit Shah <amit.shah@redhat.com> writes:

> MMC-5 Table F.1 lists errors that can be thrown for the TEST_UNIT_READY
> command.  Going from medium not ready to medium ready states is
> communicated by throwing an error.
>
> This adds the missing 'tray opened' event that we fail to report to
> guests.  After doing this, older Linux guests properly revalidate a disc
> on the change command.  HSM violation errors, which caused Linux guests
> to do a soft-reset of the link, also go away:
>
> ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
> sr 1:0:0:0: CDB: Test Unit Ready: 00 00 00 00 00 00
> ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
>          res 01/60:00:00:00:00/00:00:00:00:00/a0 Emask 0x3 (HSM violation)
> ata2.00: status: { ERR }
> ata2: soft resetting link
> ata2.00: configured for MWDMA2
> ata2: EH complete
>
> Signed-off-by: Amit Shah <amit.shah@redhat.com>

Linux is happy with it in my tests.

Tested-by: Markus Armbruster <armbru@redhat.com>