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From: Halil Pasic <pasic@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>
Cc: "Jason J. Herne" <jjherne@linux.ibm.com>,
	David Hildenbrand <david@redhat.com>,
	qemu-devel@nongnu.org, borntraeger@de.ibm.com,
	qemu-s390x@nongnu.org, bjsdjshi@linux.ibm.com
Subject: Re: [Qemu-devel] [qemu-s390x] [RFC 14/15] s390-bios: Support booting from real dasd device
Date: Wed, 18 Jul 2018 13:47:20 +0200	[thread overview]
Message-ID: <84bac3f2-2745-36e1-7bd4-20d7667c0f20@linux.ibm.com> (raw)
In-Reply-To: <20180718133537.26dfeffa.cohuck@redhat.com>



On 07/18/2018 01:35 PM, Cornelia Huck wrote:
>> So to translate the new stuff we would actually have to stop the channel
>> program and resubmit the rest (either by suspend+resume or by break
>> chaining+ssch). The problem with that an execution of a channel program
>> that is composed of four ccws A,B,C,D and an execution of a channel
>> programs composed of ccws A,B immediately followed by and execution
>> of a channel program composed of the ccws C,D is not the same. I.e. it
>> is not generally safe to break a chain of ccws.
> Exploiting suspending would have been my idea. Probably combined with a
> new interface that fetches ccw-by-ccw.
> 
> But I don't think it makes sense to spend time thinking about this
> right now.
> 

IMHO exploiting suspending won't work, because the rsch starts a new
chain. If the suspend is a part of the original program the author
of it is responsible to make sure this ain't a problem. But if we
start setting the suspend flag ourselves, we may end up in trouble.

Regards,
Halil  

  reply	other threads:[~2018-07-18 11:47 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-05 17:25 [Qemu-devel] [RFC 00/15] s390: vfio-ccw dasd ipl support Jason J. Herne
2018-07-05 17:25 ` [Qemu-devel] [RFC 01/15] s390 vfio-ccw: Add bootindex property and IPLB data Jason J. Herne
2018-07-06  7:33   ` Cornelia Huck
2018-07-11 10:33   ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2018-07-05 17:25 ` [Qemu-devel] [RFC 02/15] s390-bios: decouple cio setup from virtio Jason J. Herne
2018-07-06  7:35   ` Cornelia Huck
2018-07-05 17:25 ` [Qemu-devel] [RFC 03/15] s390-bios: decouple common boot logic " Jason J. Herne
2018-07-11 10:41   ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2018-07-05 17:25 ` [Qemu-devel] [RFC 04/15] s390-bios: Extend find_dev() for non-virtio devices Jason J. Herne
2018-07-05 17:25 ` [Qemu-devel] [RFC 05/15] s390-bios: Factor finding boot device out of virtio code path Jason J. Herne
2018-07-10  6:53   ` Christian Borntraeger
2018-07-05 17:25 ` [Qemu-devel] [RFC 06/15] s390-bios: Clean up cio.h Jason J. Herne
2018-07-17 18:15   ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2018-07-17 18:22     ` Richard Henderson
2018-07-05 17:25 ` [Qemu-devel] [RFC 07/15] s390-bios: Decouple channel i/o logic from virtio Jason J. Herne
2018-07-06  6:48   ` Christian Borntraeger
2018-07-05 17:25 ` [Qemu-devel] [RFC 08/15] s390-bios: Map low core memory Jason J. Herne
2018-07-06  6:46   ` Christian Borntraeger
2018-07-06  7:42   ` Cornelia Huck
2018-07-17 18:10   ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2018-09-10 14:17     ` Jason J. Herne
2018-09-13  5:25       ` Thomas Huth
2018-09-13 14:39         ` Jason J. Herne
2018-07-05 17:25 ` [Qemu-devel] [RFC 09/15] s390-bios: ptr2u32 and u32toptr Jason J. Herne
2018-07-05 17:25 ` [Qemu-devel] [RFC 10/15] s390-bios: Support for running format-0/1 channel programs Jason J. Herne
2018-07-06  7:04   ` Christian Borntraeger
2018-07-06 10:25     ` [Qemu-devel] [qemu-s390x] " Christian Borntraeger
2018-07-06  8:03   ` [Qemu-devel] " Cornelia Huck
2018-07-06 11:42     ` [Qemu-devel] [qemu-s390x] " Halil Pasic
2018-07-06 12:26       ` Cornelia Huck
2018-07-06 13:03         ` Halil Pasic
2018-07-06 13:15           ` Cornelia Huck
2018-07-06 13:33             ` Halil Pasic
2018-07-06 14:40               ` Jason J. Herne
2018-07-06 14:35     ` [Qemu-devel] " Jason J. Herne
2018-07-17 10:02       ` Cornelia Huck
2018-07-09  7:18   ` Christian Borntraeger
2018-07-09 10:51   ` Christian Borntraeger
2018-07-05 17:25 ` [Qemu-devel] [RFC 11/15] s390-bios: Refactor virtio to run channel programs via cio Jason J. Herne
2018-07-05 17:25 ` [Qemu-devel] [RFC 12/15] s390-bios: Use control unit type to determine boot method Jason J. Herne
2018-07-17 18:25   ` [Qemu-devel] [qemu-s390x] " Thomas Huth
2018-07-05 17:25 ` [Qemu-devel] [RFC 13/15] s390-bios: Add channel command codes/structs needed for dasd-ipl Jason J. Herne
2018-07-05 17:25 ` [Qemu-devel] [RFC 14/15] s390-bios: Support booting from real dasd device Jason J. Herne
2018-07-17 20:43   ` [Qemu-devel] [qemu-s390x] " David Hildenbrand
2018-07-18  7:40     ` Cornelia Huck
2018-07-18  7:51       ` David Hildenbrand
2018-07-18 10:55       ` Halil Pasic
2018-07-18 11:35         ` Cornelia Huck
2018-07-18 11:47           ` Halil Pasic [this message]
2018-07-18 11:44   ` [Qemu-devel] " Halil Pasic
2018-07-05 17:25 ` [Qemu-devel] [RFC 15/15] s390-bios: Use sense ccw to ensure consistent device state at boot time Jason J. Herne
2018-07-06 10:08   ` Cornelia Huck
2018-07-06 14:45     ` Jason J. Herne
2018-07-06 22:20   ` Halil Pasic
2018-07-05 18:32 ` [Qemu-devel] [RFC 00/15] s390: vfio-ccw dasd ipl support no-reply
2018-07-06  6:42 ` Cornelia Huck
2018-08-15 11:48 ` Cornelia Huck
2018-08-21 19:31   ` Jason J. Herne
2018-08-22  7:46     ` Cornelia Huck

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