From: "Richard W.M. Jones" <rjones@redhat.com>
To: Richard Henderson <richard.henderson@linaro.org>
Cc: peter.maydell@linaro.org, berrange@redhat.com, qemu-devel@nongnu.org
Subject: Re: [PATCH] tcg/arm: Reduce vector alignment requirement for NEON
Date: Mon, 13 Sep 2021 17:28:27 +0100 [thread overview]
Message-ID: <20210913162827.GH26415@redhat.com> (raw)
In-Reply-To: <f6e7ab0f-aebe-c9c5-d479-fa30e69fcd1c@linaro.org>
On Mon, Sep 13, 2021 at 09:19:22AM -0700, Richard Henderson wrote:
> On 9/13/21 4:07 AM, Richard W.M. Jones wrote:
> >>[ 0.000000] Linux version 5.14.0-60.fc36.armv7hl (mockbuild@buildvm-a32-12.iad2.fedoraproject.org) (gcc (GCC) 11.2.1 20210728 (Red Hat 11.2.1-1), GNU ld version 2.37-9.fc36) #1 SMP Mon Aug 30 14:08:34 UTC 2021
> >>
> >>I thought about parameterizing this patch further, but I can't think of
> >>another ISA that would be affected. (i686 clumsily changed its abi 20
> >>years ago to avoid faulting on vector spills; other isas so far have
> >>allowed vectors to be unaligned.)
> >
> >Is it possible this change could have caused a more serious
> >regression?
>
> I don't think so...
>
> >Now when I try to boot the Fedora kernel using TCG on
> >armv7hl I can't even get to the point where it detects virtio-scsi
> >devices.
> >
> >Full log is here (go down to the bottom and work backwards):
> >
> > https://kojipkgs.fedoraproject.org//work/tasks/7337/75597337/build.log
>
> I downloaded the 5.14.0-60 kernel from above, and I can reproduce
> the original error, and I see that it's fixed afterward.
Thanks for checking that. I did spend much of today attempting to get
an armv7 guest installed on my RPi so I could reproduce this more
reliably, but eventually gave up because of a variety of other
problems (one apparently in qemu: https://bugzilla.redhat.com/1633328)
> I'll have a look at this new build log in a moment...
>
>
> r~
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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next prev parent reply other threads:[~2021-09-13 16:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-12 17:49 [PATCH] tcg/arm: Reduce vector alignment requirement for NEON Richard Henderson
2021-09-13 8:07 ` Richard W.M. Jones
2021-09-13 11:07 ` Richard W.M. Jones
2021-09-13 16:19 ` Richard Henderson
2021-09-13 16:28 ` Richard W.M. Jones [this message]
2021-09-13 17:01 ` Peter Maydell
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