linux-kernel - Re: [PATCH] x86/entry_32: Move CLEAR_CPU

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Date: Thu, 9 May 2024 17:04:36 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: Borislav Petkov <bp@...en8.de>, Dave Hansen
 <dave.hansen@...ux.intel.com>, linux-kernel@...r.kernel.org, x86@...nel.org,
 Robert Gill <rtgill82@...il.com>,
 "Linux regression tracking (Thorsten Leemhuis)" <regressions@...mhuis.info>,
 antonio.gomez.iglesias@...ux.intel.com, daniel.sneddon@...ux.intel.com
Subject: Re: [PATCH] x86/entry_32: Move CLEAR_CPU_BUFFERS before CR3 switch

On 5/9/24 15:17, Pawan Gupta wrote:
> It probably can go right before the SWITCH_TO_USER_CR3. I didn't have
> 32-bit setup with dosemu to experiment with. I will attach a debug patch to
> the bugzilla and request the reporter to test it.

There's an enter_from_vm86.c in the kernel selftests.  That will at
least exercise this path.