linux-kernel - Re: [PATCH v2 3/8] x86/msr: Add definitions for new speculation control MSRs

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Date:   Sun, 21 Jan 2018 14:06:39 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     David Woodhouse <dwmw@...zon.co.uk>, arjan@...ux.intel.com,
        tglx@...utronix.de, karahmed@...zon.de, x86@...nel.org,
        linux-kernel@...r.kernel.org, tim.c.chen@...ux.intel.com,
        bp@...en8.de, peterz@...radead.org, pbonzini@...hat.com,
        ak@...ux.intel.com, torvalds@...ux-foundation.org,
        gregkh@...ux-foundation.org
Subject: Re: [PATCH v2 3/8] x86/msr: Add definitions for new speculation
 control MSRs

On 01/21/2018, 10:49 AM, David Woodhouse wrote:
> Add MSR and bit definitions for SPEC_CTRL, PRED_CMD and ARCH_CAPABILITIES.
> 
> See Intel's 336996-Speculative-Execution-Side-Channel-Mitigations.pdf
> 
> Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
> ---
>  arch/x86/include/asm/msr-index.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> index fa11fb1..3e50463 100644
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -42,6 +42,13 @@
>  #define MSR_PPIN_CTL			0x0000004e
>  #define MSR_PPIN			0x0000004f
>  
> +#define MSR_IA32_SPEC_CTRL		0x00000048 /* Speculation Control */
> +#define SPEC_CTRL_IBRS			(1 << 0)   /* Indirect Branch Restricted Speculation */
> +#define SPEC_CTRL_STIBP			(1 << 1)   /* Single Thread Indirect Branch Predictors */
> +
> +#define MSR_IA32_PRED_CMD		0x00000049 /* Prediction Command */
> +#define PRED_CMD_IBPB			(1 << 0)   /* Indirect Branch Prediction Barrier */
> +
>  #define MSR_IA32_PERFCTR0		0x000000c1
>  #define MSR_IA32_PERFCTR1		0x000000c2
>  #define MSR_FSB_FREQ			0x000000cd
> @@ -60,6 +67,10 @@
>  #define MSR_IA32_BBL_CR_CTL		0x00000119
>  #define MSR_IA32_BBL_CR_CTL3		0x0000011e
>  
> +#define MSR_IA32_ARCH_CAPABILITIES	0x0000010a
> +#define ARCH_CAP_RDCL_NO		(1 << 0)   /* Not susceptible to Meltdown */
> +#define ARCH_CAP_IBRS_ALL		(1 << 1)   /* Enhanced IBRS support */

Is there any reason why all 3 are not properly sorted?
0x04e > 0x048
0x119 > 0x10a

>  #define MSR_IA32_SYSENTER_CS		0x00000174
>  #define MSR_IA32_SYSENTER_ESP		0x00000175
>  #define MSR_IA32_SYSENTER_EIP		0x00000176
> 

thanks,
-- 
js
suse labs