linux-kernel - Re: [REGRESSION 5.0.x] Windows XP broken on KVM

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Message-ID: <20190424001841.GA14422@linux.intel.com>
Date:   Tue, 23 Apr 2019 17:18:41 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Takashi Iwai <tiwai@...e.de>,
        Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION 5.0.x] Windows XP broken on KVM

On Tue, Apr 23, 2019 at 10:23:17PM +0200, Greg Kroah-Hartman wrote:
> On Thu, Apr 18, 2019 at 09:56:02AM +0200, Paolo Bonzini wrote:
> > On 18/04/19 09:38, Takashi Iwai wrote:
> > > Hi,
> > > 
> > > we've got a regression report on the recent 5.0.x kernel, starting
> > > from 5.0.6, where Windows XP can't boot on KVM any longer.
> > > 
> > > The culprit seems to be the patch
> > >    KVM: x86: update %rip after emulating IO
> > > with the upstream commit 45def77ebf79e2e8942b89ed79294d97ce914fa0.
> > > Reverting this alone fixed the problem.
> > > 
> > > The report is found at openSUSE bugzilla:
> > >   https://bugzilla.suse.com/show_bug.cgi?id=1132694
> > > 
> > > Is there already a followup fix?  If not, we need to revert it from
> > > stable, at least.
> > 
> > No, it's the first time I hear this and I actually test Windows XP
> > before every pull request I send to Linus...  I'll download 5.0.x and
> > test it there.
> 
> Any further ideas about this?

I followed up on the bugzilla to request more information.  My best guess
at this point is that the issue is related to an older version of Qemu or
a specific emulated device, but without additional details we're stuck.