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

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Date:   Thu, 18 Apr 2019 09:38:52 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org
Subject: [REGRESSION 5.0.x] Windows XP broken on KVM

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.

thanks,

Takashi