linux-kernel - Re: [PATCH 4/6] x86/bugs: Use ALTERNATIVE() instead of mds_user

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231023184844.e2loaxlldm4zbko2@treble>
Date:   Mon, 23 Oct 2023 11:48:44 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>, tony.luck@...el.com,
        ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        kvm@...r.kernel.org,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
        antonio.gomez.iglesias@...ux.intel.com
Subject: Re: [PATCH  4/6] x86/bugs: Use ALTERNATIVE() instead of
 mds_user_clear static key

On Fri, Oct 20, 2023 at 01:45:15PM -0700, Pawan Gupta wrote:
> @@ -484,11 +484,11 @@ static void __init md_clear_update_mitigation(void)
>  	if (cpu_mitigations_off())
>  		return;
>  
> -	if (!static_key_enabled(&mds_user_clear))
> +	if (!boot_cpu_has(X86_FEATURE_USER_CLEAR_CPU_BUF))
>  		goto out;
>  
>  	/*
> -	 * mds_user_clear is now enabled. Update MDS, TAA and MMIO Stale Data
> +	 * X86_FEATURE_USER_CLEAR_CPU_BUF is now enabled. Update MDS, TAA and MMIO Stale Data
>  	 * mitigation, if necessary.
>  	 */

This comment line got long, the paragraph can be reformatted.

-- 
Josh