linux-kernel - Re: Stable linux-5.10.x regression triggered by MDS mitigation

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Date: Mon, 1 Jul 2024 08:42:15 -0700
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Jari Ruusu <jariruusu@...tonmail.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Stable linux-5.10.x regression triggered by MDS mitigation

On Mon, Jul 01, 2024 at 02:55:08PM +0000, Jari Ruusu wrote:
> On Monday, July 1st, 2024 at 15:27, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> > On Wed, Jun 26, 2024 at 01:02:35PM +0000, Jari Ruusu wrote:
> > > On Tuesday, June 25th, 2024 at 21:01, Pawan Gupta pawan.kumar.gupta@...ux.intel.com wrote:
> > > > Thanks for pointing this out, CLEAR_CPU_BUFFERS should happen before POPFL.
> > > > Below patch moves it before POPFL and also adds a safer version that
> > > > switches to KERNEL_DS before executing VERW. This should ensure VERW works
> > > > in all cases:
> > > 
> > > Your patch looks OK to me. Thanks.
> > > Tested on linux-5.10.220 inside 32-bit VM.
> > 
> > Great! Hopefully someone submits this to the stable tree so we can
> > accept it...
> 
> Upstream is still not fixed. My understanding is that the patch
> is on its way to upstream already, but not there yet.

Yes, its being discussed here:

  https://lore.kernel.org/lkml/20240627-fix-dosemu-vm86-v2-1-d5579f698e77@linux.intel.com/