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From: Kevin Wolf <kwolf@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>,
	Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>,
	qemu-devel <qemu-devel@nongnu.org>,
	qemu-block@nongnu.org, Jens Freimann <jfrei@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] [PATCH 0/1] Fixup for DASD geometry detection
Date: Tue, 12 Jan 2016 15:25:21 +0100	[thread overview]
Message-ID: <20160112142521.GE4841@noname.redhat.com> (raw)
In-Reply-To: <1450107679-34555-1-git-send-email-borntraeger@de.ibm.com>

Am 14.12.2015 um 16:41 hat Christian Borntraeger geschrieben:
> Kevin,
> 
> here is a fixup for the geometry detection. We tried to be overly
> clever and calculate the cyclinder size for devices > 64k cyls. Now
> this is wrong for the cyls parameter as the interface only has
> 16bit. Large DASD devices have a special token (0xfffe) that 
> indicate to the DASD related code, that you have to calculate
> the cyls size yourself.
> 
> Without this patch QEMU cannot pass through bigger DASD disks
> and complains "cyls must be between 1 and 65535"

Thanks, applied to the block branch.

Kevin

      parent reply	other threads:[~2016-01-12 14:25 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-14 15:41 [Qemu-devel] [PATCH 0/1] Fixup for DASD geometry detection Christian Borntraeger
2015-12-14 15:41 ` [Qemu-devel] [PATCH 1/1] block/raw-posix: avoid bogus fixup for cylinders on DASD disks Christian Borntraeger
2015-12-14 17:42   ` Markus Armbruster
2015-12-14 17:49   ` Cornelia Huck
2016-01-07  9:23     ` Christian Borntraeger
2016-01-12 14:25 ` Kevin Wolf [this message]

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