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

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Message-ID: <20240510002434.gevlrqdiuhtosafa@desk>
Date: Thu, 9 May 2024 17:24:34 -0700
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Dave Hansen <dave.hansen@...el.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 Thu, May 09, 2024 at 05:04:36PM -0700, Dave Hansen wrote:
> 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.

Yes, entry_from_vm86.c should be a good test case for this, thanks.