linux-kernel - Re: [PATCH V7 5/6] x86/entry: Don't call error

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Message-ID: <ba0ac993-308d-071d-4f2e-6e664931f6d0@suse.com>
Date:   Tue, 3 May 2022 09:24:13 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Lai Jiangshan <jiangshan.ljs@...group.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH V7 5/6] x86/entry: Don't call error_entry() for XENPV

On 03.05.22 05:21, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@...group.com>
> 
> When in XENPV, it is already in the task stack, and it can't fault for
> native_iret() nor native_load_gs_index() since XENPV uses its own pvops
> for IRET and load_gs_index().  And it doesn't need to switch the CR3.
> 
> So there is no reason to call error_entry() in XENPV.
> 
> Cc: Juergen Gross <jgross@...e.com>
> Signed-off-by: Lai Jiangshan <jiangshan.ljs@...group.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen

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