linux-kernel - Re: [PATCH 2/7] x86/msr: add definitions for indirect branch predictor MSRs

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Date:   Mon, 8 Jan 2018 13:35:29 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        jmattson@...gle.com, aliguori@...zon.com, thomas.lendacky@....com,
        dwmw@...zon.co.uk, bp@...en8.de
Subject: Re: [PATCH 2/7] x86/msr: add definitions for indirect branch
 predictor MSRs

On Mon, Jan 08, 2018 at 07:08:40PM +0100, Paolo Bonzini wrote:
> KVM will start using them soon.

Perhaps include a bit of description?
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/include/asm/msr-index.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> index 03ffde6217d0..ec08f1d8d39b 100644
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -39,6 +39,11 @@
>  
>  /* Intel MSRs. Some also available on other CPUs */
>  
> +#define MSR_IA32_SPEC_CTRL		0x00000048
> +
> +#define MSR_IA32_PRED_CMD		0x00000049
> +#define FEATURE_SET_IBPB		(1UL << 0)
> +
>  #define MSR_PPIN_CTL			0x0000004e
>  #define MSR_PPIN			0x0000004f
>  
> -- 
> 1.8.3.1
> 
>