linux-kernel - Re: [v8, 4/5] x86/xsave: Make XSAVE check the base CPUID features before enabling

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Date:   Thu, 16 Nov 2017 14:13:20 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     Andi Kleen <ak@...ux.intel.com>, x86@...nel.org, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: Re: [v8, 4/5] x86/xsave: Make XSAVE check the base CPUID features
 before enabling

On Thu, Nov 16, 2017 at 11:03:47AM -0800, Andi Kleen wrote:
> > It is what I use at kerneltests.org.
> > See https://github.com/groeck/linux-build-test/tree/master/rootfs/x86_64
> > for configuration and script.
> > 
> > > I can't reproduce it here with different qemu settings.
> > > 
> > Interesting. What version of qemu are you using ?
> 
> I tested with your config: -no-kvm -cpu Broadwell-noTSX -M q35 and still
> don't see any boot warnings. This is 
> 
> QEMU emulator version 2.9.1(qemu-2.9.1-2.fc26)
> 
> If you're on an older version it may be already fixed in qemu then.
> 

I see the problem with both qemu 2.9.1 and 2.10.1. Interestingly, I don't
see it with an official Debian 2.5.0 build. Maybe it is the result of some
configuration option in my build.

Let's just ignore it for now.

Guenter