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

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Date: Wed, 26 Jun 2024 13:02:35 +0000
From: Jari Ruusu <jariruusu@...tonmail.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Stable linux-5.10.x regression triggered by MDS mitigation

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.

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