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Date: Thu, 9 May 2024 17:24:34 -0700
From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	Robert Gill <rtgill82@gmail.com>,
	"Linux regression tracking (Thorsten Leemhuis)" <regressions@leemhuis.info>,
	antonio.gomez.iglesias@linux.intel.com,
	daniel.sneddon@linux.intel.com
Subject: Re: [PATCH] x86/entry_32: Move CLEAR_CPU_BUFFERS before CR3 switch
Message-ID: <20240510002434.gevlrqdiuhtosafa@desk>
References: <20240426-fix-dosemu-vm86-v1-1-88c826a3f378@linux.intel.com>
 <5b5e597d-7620-4a5a-9bfa-bae26f0b0fa3@intel.com>
 <20240509221425.zcl6c45thb7wxyza@desk>
 <e3a8075a-0846-4244-85da-1af45c83bbc4@intel.com>
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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.