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

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Message-ID: <HhniN4n96_JaNG8CoExQV0wVbtYBjetZdyYg5d29J85Cc2mR6RNR8ZiVhIx7OQMwK-kTh_n1g1n3LuheOayxsnjqgvAU-162TYAOb_RmuWk=@protonmail.com>
Date: Mon, 01 Jul 2024 14:55:08 +0000
From: Jari Ruusu <jariruusu@...tonmail.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, 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 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.

--
Jari Ruusu  4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD  ACDF F073 3C80 8132 F189