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

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Date:   Fri, 26 Apr 2019 10:17:18 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Takashi Iwai <tiwai@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION 5.0.x] Windows XP broken on KVM

On 18/04/19 10:05, Takashi Iwai wrote:
> On Thu, 18 Apr 2019 09:53:28 +0200,
> Greg Kroah-Hartman wrote:
>>
>> On Thu, Apr 18, 2019 at 09:38:52AM +0200, 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.
>>
>> Is this also a problem in 5.1-rc5?
> 
> Only 5.0.x has been tested, so far.
> I'll ask the reporter to try 5.1-rc if Paolo can't reproduce the
> problem in his side.

Back from vacation.  I'll try AMD, that's the most likely culprit.

Paolo