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From: Eric Blake <eblake@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>, John Snow <jsnow@redhat.com>
Cc: Stefan Fritsch <sf@sfritsch.de>, QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PULL 2/3] ahci: Force ICC bits in PxCMD to zero
Date: Tue, 21 Jul 2015 06:55:42 -0600
Message-ID: <55AE414E.6070505@redhat.com> (raw)
In-Reply-To: <CAFEAcA_7OKrZexyoAFc3Jhiib=Syf3UUKPYGNxdPmQO_wm-vMQ@mail.gmail.com>

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On 07/21/2015 05:38 AM, Peter Maydell wrote:
> On 20 July 2015 at 19:29, John Snow <jsnow@redhat.com> wrote:
>> From: Stefan Fritsch <sf@sfritsch.de>
>>
>> The AHCI spec requires that the HBA sets the ICC bits to zero after the
>> ICC change is done. Since we don't do any ICC change, force the bits to
>> zero all the time.
>>
>> This fixes delays with some OSs (e.g. OpenBSD) waiting for the ICC bits
>> to change to 0.
> 
> This change provokes a lot of clang sanitizer warnings:
> 
> /home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:288:49: runtime
> error: left shift of 15 by 28 places cannot be represented in type
> 'int'
> 
> PORT_CMD_ICC_MASK is defined as
> 
>  #define PORT_CMD_ICC_MASK         (0xf << 28) /* i/f ICC state mask */
> 
> which shifts into the sign bit of a signed integer.

Should be fixable by using (0xfU << 28), right?

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-20 18:29 [Qemu-devel] [PULL 0/3] Ide patches John Snow
2015-07-20 18:29 ` [Qemu-devel] [PULL 1/3] qtest/ide: add another short PRDT test flavor John Snow
2015-07-20 18:29 ` [Qemu-devel] [PULL 2/3] ahci: Force ICC bits in PxCMD to zero John Snow
2015-07-21 11:38   ` Peter Maydell
2015-07-21 12:55     ` Eric Blake [this message]
2015-07-21 13:02       ` Peter Maydell
2015-07-21 17:41         ` John Snow
2015-07-20 18:29 ` [Qemu-devel] [PULL 3/3] tests: Fix broken targets check-report-qtest-* John Snow
2015-07-21 10:18 ` [Qemu-devel] [PULL 0/3] Ide patches Peter Maydell

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