linux-kernel - Re: [PATCH RFC V2 17/17] x86/entry: Preserve PKRS MSR across exceptions

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Message-ID: <871rl0txai.fsf@nanos.tec.linutronix.de>
Date:   Fri, 24 Jul 2020 23:31:33 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH RFC V2 17/17] x86/entry: Preserve PKRS MSR across exceptions

Thomas Gleixner <tglx@...utronix.de> writes:
> static __always_inline idtentry_state_t idtentry_nmi_enter(void)
> {
>      	idtentry_state_t state = {};
>
>         nmi_enter();
>         instrumentation_begin();
>         state.key = save_and_clear_key();
>         instrumentation_end();

Clearly lacks a

        return state;

But I assume you already spotted it. Otherwise the compiler would have :)

Thanks,

        tglx