linux-kernel - Re: [PATCH v1 1/1] x86: Skip WBINVD instruction for VM guest

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Message-ID: <YZPbQVwWOJCrAH78@zn.tnic>
Date:   Tue, 16 Nov 2021 17:24:33 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] x86: Skip WBINVD instruction for VM guest

On Mon, Nov 15, 2021 at 04:50:27PM -0800, Kuppuswamy Sathyanarayanan wrote:
> -#define ACPI_FLUSH_CPU_CACHE()	wbinvd()
> +#define ACPI_FLUSH_CPU_CACHE()				\
> +do {							\
> +	if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))	\

cpu_feature_enabled()

If you wanna query a X86_FEATURE_* bit, from now on, use only this
function.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette