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Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs |
Date: |
Tue, 24 Jan 2017 12:17:40 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 |
On 23/01/2017 20:16, Markus Armbruster wrote:
>> Could we change
>> those messages to errors
>
> Fine with me, but when it comes to arguing for backward compatibility of
> our byzantine command line, I'm kind of like a lethargic public defender
> with an overly deep relationship to Bourbon. "Your honor, sure capital
> punishment is called for? Yes? Okay then."
>
> I vaguely recall discussing the topic with Peter (cc'ed). If memory
> serves, one concern was breaking usage of -device with -drive lacking
> if=... Works fine (no warning) with machines that don't pick up drives
> with their default block interface type, i.e. most of them. But PATCH 3
> changes their default to if=none, so that usage wouldn't actually break.
I think that tips the scale in favor of having errors.
> What would break is -device with -drive if=T, where T is not none and
> not picked up by the board. Such usage is certainly questionable[*],
> but it's questionable enough for us to break it?
>
>> and then drop PC if=scsi support altogether?
>
> Different backward compatibility question: here we break usage of
> if=scsi with PC machine types. Legacy way to do things, but it's
> documented in qemu.1. Are we happy to break it?
That usage is wrong after this patch, since it mentions
qemu-system-i386. So it's documented, but almost useless and the
example is not exactly correct. Let's deprecate it in 2.9 and remove in
2.10.
Paolo
- [Qemu-devel] [PATCH 0/6] More sensible default for -drive interface type, Markus Armbruster, 2017/01/23
- [Qemu-devel] [PATCH 4/6] hw: Default -drive to if=none instead of scsi when scsi cannot work, Markus Armbruster, 2017/01/23
- [Qemu-devel] [PATCH 5/6] hw/arm/highbank: Default -drive to if=ide instead of if=scsi, Markus Armbruster, 2017/01/23
- [Qemu-devel] [PATCH 2/6] hw/arm/cubieboard hw/arm/xlnx-ep108: Fix units_per_default_bus, Markus Armbruster, 2017/01/23
- [Qemu-devel] [PATCH 1/6] hw: Default -drive to if=ide explicitly where it works, Markus Armbruster, 2017/01/23
- [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Markus Armbruster, 2017/01/23
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Paolo Bonzini, 2017/01/23
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Markus Armbruster, 2017/01/23
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Markus Armbruster, 2017/01/24
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Paolo Bonzini, 2017/01/24
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Markus Armbruster, 2017/01/24
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Peter Maydell, 2017/01/24
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Paolo Bonzini, 2017/01/24
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Peter Maydell, 2017/01/24
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Markus Armbruster, 2017/01/24
- Re: [Qemu-devel] [PATCH 6/6] hw/i386/i386: Stop auto-creating lsi53c895a SCSI HBAs, Markus Armbruster, 2017/01/25
[Qemu-devel] [PATCH 3/6] hw: Default -drive to if=none instead of ide when ide cannot work, Markus Armbruster, 2017/01/23