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From: "Hervé Poussineau" <hpoussin@reactos.org>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: "Liu Ping Fan" <pingfank@linux.vnet.ibm.com>,
	qemu-devel <qemu-devel@nongnu.org>,
	"Alexander Graf" <agraf@suse.de>,
	"Jan Kiszka" <jan.kiszka@web.de>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Andreas Färber" <afaerber@suse.de>
Subject: Re: [Qemu-devel] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer
Date: Sat, 13 Jul 2013 20:11:25 +0200	[thread overview]
Message-ID: <51E1984D.2090802@reactos.org> (raw)
In-Reply-To: <CA+aC4ks0PUZVbeMw6Mo5K9AEr5GA3m+kbDP=Ri+Wn4y7r47=3Q@mail.gmail.com>

Anthony Liguori a écrit :
> On Sat, Jul 13, 2013 at 9:38 AM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> Il 11/07/2013 14:46, Andreas Färber ha scritto:
>>> sPAPR has its MemoryRegion marked Little Endian:
>>>
>>> http://git.qemu.org/?p=qemu.git;a=blobdiff;f=hw/spapr_pci.c;h=a08ed11166595bdc493065beb64d4ce5b7b0dded;hp=c2c3079d21d5be2647faf85a8c608ac995d2ca62;hb=a3cfa18eb075c7ef78358ca1956fe7b01caa1724;hpb=286d52ebfc0d0d53c2a878e454292fea14bad41b
>>>
>>> Possibly we can now apply Hervé's patches on top to remove that hack again?
>> I can post a pull request with Herve's patch, if we agree that it's the
>> right thing.
> 
> http://permalink.gmane.org/gmane.comp.emulators.qemu/221950
> 
> Here's what's happening:
> 
> 1) MMIO request goes to sPAPR PIO area, the vCPU was in BE mode but by
> the time the handler is called, the value is in host byte order.
> 
> 2) sPAPR (incorrectly) byte swaps by marking the region as little
> endian (data is now garbage)
> 
> 3) The portio layer (incorrectly) byte swaps because it is marked as
> little endian (data is now good)
> 
> 4) Dispatch happens to VGA device which (incorrectly) byte swaps
> because it is marked as little endian (data is now bad)
> 
> (2), (3), and (4) are all wrong.  By removing either (2) or (3) we can
> "fix" the regression but that's just because two wrongs make a right
> in this situation.
> 
> We should remove *all* of the LE markings from ISA devices, remove the
> portio mark, and the sPAPR mark.  That's the right fix.

OK for that if that fixes sPAPR.

Hervé

  reply	other threads:[~2013-07-13 18:11 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-22  6:06 [Qemu-devel] [PATCH v3 00/14] Refactor portio dispatching Jan Kiszka
2013-06-22  6:06 ` [Qemu-devel] [PATCH v3 01/14] adlib: replace register_ioport* Jan Kiszka
2013-06-22  6:06 ` [Qemu-devel] [PATCH v3 02/14] applesmc: " Jan Kiszka
2013-06-22  6:06 ` [Qemu-devel] [PATCH v3 03/14] wdt_ib700: " Jan Kiszka
2013-06-22  6:06 ` [Qemu-devel] [PATCH v3 04/14] i82374: " Jan Kiszka
2013-06-22  6:06 ` [Qemu-devel] [PATCH v3 05/14] prep: " Jan Kiszka
2013-06-22  6:06 ` [Qemu-devel] [PATCH v3 06/14] vt82c686: " Jan Kiszka
2013-06-22  6:07 ` [Qemu-devel] [PATCH v3 07/14] Privatize register_ioport_read/write Jan Kiszka
2013-06-22  6:07 ` [Qemu-devel] [PATCH v3 08/14] isa: implement isa_is_ioport_assigned via memory_region_find Jan Kiszka
2013-06-22  6:07 ` [Qemu-devel] [PATCH v3 09/14] vmware-vga: Accept unaligned I/O accesses Jan Kiszka
2013-06-22  6:07 ` [Qemu-devel] [PATCH v3 10/14] xen: Mark fixed platform I/O as unaligned Jan Kiszka
2013-06-22  6:07 ` [Qemu-devel] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer Jan Kiszka
2013-06-23 20:50   ` Hervé Poussineau
2013-06-24  6:07     ` Jan Kiszka
2013-07-11 12:29       ` Alexander Graf
2013-07-11 12:34         ` Alexander Graf
2013-07-11 12:46           ` Andreas Färber
2013-07-11 12:48             ` Alexander Graf
2013-07-11 13:28               ` Alexander Graf
2013-07-11 13:35                 ` Alexander Graf
2013-07-11 22:30                 ` [Qemu-devel] [Qemu-ppc] " Benjamin Herrenschmidt
2013-07-11 22:32                 ` Benjamin Herrenschmidt
2013-07-12  3:18                   ` Alexander Graf
2013-07-12 11:35                     ` Benjamin Herrenschmidt
2013-07-12 17:04                       ` Hervé Poussineau
2013-07-12 19:06                         ` Anthony Liguori
2013-07-12 22:59                           ` Benjamin Herrenschmidt
2013-07-12 22:39                         ` Benjamin Herrenschmidt
2013-07-12 17:49                       ` Anthony Liguori
2013-07-12 18:26                         ` Peter Maydell
2013-07-12 22:50                           ` Benjamin Herrenschmidt
2013-07-12 23:10                             ` Peter Maydell
2013-07-12 23:49                               ` Benjamin Herrenschmidt
2013-07-15 14:01                               ` Anthony Liguori
2013-07-15 14:10                                 ` Peter Maydell
2013-07-15 14:16                                 ` Benjamin Herrenschmidt
2013-07-12 22:44                         ` Benjamin Herrenschmidt
2013-07-13 14:38             ` [Qemu-devel] " Paolo Bonzini
2013-07-13 15:22               ` Anthony Liguori
2013-07-13 18:11                 ` Hervé Poussineau [this message]
2013-07-14  6:15                 ` Paolo Bonzini
2013-07-14 13:05                   ` Anthony Liguori
2013-07-14 14:58                     ` Peter Maydell
2013-07-14 15:18                       ` Anthony Liguori
2013-07-14 16:50                         ` Peter Maydell
2013-07-16  7:18                         ` Jan Kiszka
2013-07-16  7:33                           ` Paolo Bonzini
2013-07-16 16:59                             ` Hervé Poussineau
2013-07-16 17:12                               ` Paolo Bonzini
2013-07-12 12:56           ` Anthony Liguori
2013-07-12 14:30             ` Alexander Graf
2013-07-19 11:09         ` [Qemu-devel] BUG: " Alexey Kardashevskiy
2013-07-19 12:49           ` Paolo Bonzini
2013-07-19 15:48             ` Alexey Kardashevskiy
2013-07-20  0:55               ` Alexey Kardashevskiy
2013-07-20  1:11                 ` Alexey Kardashevskiy
2013-07-20 10:11                   ` Paolo Bonzini
2013-07-20 20:53                     ` Edgar E. Iglesias
2013-07-21 15:13                     ` Hervé Poussineau
2013-07-22 10:25                       ` Paolo Bonzini
2013-06-24  8:45     ` [Qemu-devel] [PATCH v4 " Jan Kiszka
2013-07-12 19:36     ` [Qemu-devel] [PATCH v3 " Anthony Liguori
2013-06-22  6:07 ` [Qemu-devel] [PATCH v3 12/14] ioport: Remove unused old dispatching services Jan Kiszka
2013-06-22  6:07 ` [Qemu-devel] [PATCH v3 13/14] vmport: Disentangle read handler type from portio Jan Kiszka
2013-06-22  6:07 ` [Qemu-devel] [PATCH v3 14/14] ioport: Move portio types to ioport.h Jan Kiszka
2013-06-23 20:45 ` [Qemu-devel] [PATCH v3 00/14] Refactor portio dispatching Hervé Poussineau

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