linux-kernel - Re: [PATCH 09/16] x86/vmx: Introduce VMX_FEATURES

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Date:   Mon, 7 Oct 2019 19:08:28 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Tony Luck <tony.luck@...el.com>,
        Tony W Wang-oc <TonyWWang-oc@...oxin.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, linux-edac@...r.kernel.org,
        Borislav Petkov <bp@...e.de>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Subject: Re: [PATCH 09/16] x86/vmx: Introduce VMX_FEATURES_*

On 04/10/19 23:56, Sean Christopherson wrote:
> +#define VMX_FEATURE_RDSEED_EXITING	( 2*32+ 16) /* "" VM-Exit on RDSEED */
> +#define VMX_FEATURE_PAGE_MOD_LOGGING	( 2*32+ 17) /* "pml" Log dirty pages into buffer */
> +#define VMX_FEATURE_EPT_VIOLATION_VE	( 2*32+ 18) /* "" Conditionally reflect EPT violations as #VE exceptions */
> +#define VMX_FEATURE_PT_CONCEAL_VMX	( 2*32+ 19) /* "" Suppress VMX indicators in Processor Trace */
> +#define VMX_FEATURE_XSAVES		( 2*32+ 20) /* "" Enable XSAVES and XRSTORS in guest */
> +#define VMX_FEATURE_RESERVED_PIN_21	( 2*32+ 21) /* "" Reserved */
> +#define VMX_FEATURE_MODE_BASED_EPT_EXEC	( 2*32+ 22) /* Enable separate EPT EXEC bits for supervisor vs. user */
> +#define VMX_FEATURE_RESERVED_PIN_23	( 2*32+ 23) /* "" Reserved */
> +#define VMX_FEATURE_PT_USE_GPA		( 2*32+ 24) /* "" Processor Trace logs GPAs */
> +#define VMX_FEATURE_TSC_SCALING		( 2*32+ 25) /* Scale hardware TSC when read in guest */
> +#define VMX_FEATURE_RESERVED_PIN_26	( 2*32+ 26) /* "" Reserved */
> +#define VMX_FEATURE_RESERVED_PIN_27	( 2*32+ 27) /* "" Reserved */
> +#define VMX_FEATURE_ENCLV_EXITING	( 2*32+ 28) /* "" VM-Exit on ENCLV (leaf dependent) */
> +#define VMX_FEATURE_RESERVED_PIN_29	( 2*32+ 29) /* "" Reserved */
> +#define VMX_FEATURE_RESERVED_PIN_30	( 2*32+ 30) /* "" Reserved */
> +#define VMX_FEATURE_RESERVED_PIN_31	( 2*32+ 31) /* "" Reserved */

Pasto on the reserved bit names, but in general why is it useful to
define them?

Paolo