linux-kernel - Re: [PATCH v2 2/4] x86/cpufeatures: Enumerate TSX suspend load address tracking instructions

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Date:   Tue, 7 Jul 2020 11:40:19 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Cathy Zhang <cathy.zhang@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        pbonzini@...hat.com, sean.j.christopherson@...el.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        joro@...tes.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, ricardo.neri-calderon@...ux.intel.com,
        kyung.min.park@...el.com, jpoimboe@...hat.com, ak@...ux.intel.com,
        dave.hansen@...el.com, tony.luck@...el.com,
        ravi.v.shankar@...el.com
Subject: Re: [PATCH v2 2/4] x86/cpufeatures: Enumerate TSX suspend load
 address tracking instructions

On Tue, Jul 07, 2020 at 10:16:21AM +0800, Cathy Zhang wrote:
> Intel TSX suspend load tracking instructions aim to give a way to
> choose which memory accesses do not need to be tracked in the TSX
> read set. Add TSX suspend load tracking CPUID feature flag TSXLDTRK
> for enumeration.
> 
> A processor supports Intel TSX suspend load address tracking if
> CPUID.0x07.0x0:EDX[16] is present. Two instructions XSUSLDTRK, XRESLDTRK
> are available when this feature is present.
> 
> The CPU feature flag is shown as "tsxldtrk" in /proc/cpuinfo.
> 
> Detailed information on the instructions and CPUID feature flag TSXLDTRK
> can be found in the latest Intel Architecture Instruction Set Extensions
> and Future Features Programming Reference and Intel 64 and IA-32
> Architectures Software Developer's Manual.
> 
> Signed-off-by: Kyung Min Park <kyung.min.park@...el.com>
> Signed-off-by: Cathy Zhang <cathy.zhang@...el.com>
> ---
>  arch/x86/include/asm/cpufeatures.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> index adf45cf..34b66d7 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -366,6 +366,7 @@
>  #define X86_FEATURE_MD_CLEAR		(18*32+10) /* VERW clears CPU buffers */
>  #define X86_FEATURE_TSX_FORCE_ABORT	(18*32+13) /* "" TSX_FORCE_ABORT */
>  #define X86_FEATURE_SERIALIZE		(18*32+14) /* SERIALIZE instruction */
> +#define X86_FEATURE_TSX_LDTRK           (18*32+16) /* TSX Suspend Load Address Tracking */

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