linux-kernel - Re: [patch V5 02/38] x86/entry/64: Use native swapgs in asm_native_load_gs

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Message-ID: <c266d480-b53e-a469-428a-eb3e3aa8a7e9@suse.com>
Date:   Wed, 13 May 2020 09:12:07 +0200
From:   Jürgen Groß <jgross@...e.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Jason Chen CJ <jason.cj.chen@...el.com>,
        Zhao Yakui <yakui.zhao@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: [patch V5 02/38] x86/entry/64: Use native swapgs in
 asm_native_load_gs_index()

On 12.05.20 23:01, Thomas Gleixner wrote:
> When PARAVIRT_XXL is in use, then load_gs_index() uses
> xen_load_gs_index() and (asm_))native_load_gs_index() is unused.
> 
> It's therefore pointless to use the paravirtualized SWAPGS implementation
> in asm_native_load_gs_index(). Switch it to a plain swapgs.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Juergen Gross <jgross@...e.com>

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


Juergen