Re: [PATCH 1/7] x86/feature: Detect the x86 feature to control Speculation

[Thomas Gleixner]

On Thu, 4 Jan 2018, Tim Chen wrote:
> +#define MSR_IA32_SPEC_CTRL		0x00000048
> +#define SPEC_CTRL_FEATURE_DISABLE_IBRS	(0 << 0)
> +#define SPEC_CTRL_FEATURE_ENABLE_IBRS	(1 << 0)
> +
> +#define MSR_IA32_PRED_CMD		0x00000049
> +
>  #define MSR_IA32_PERFCTR0		0x000000c1
>  #define MSR_IA32_PERFCTR1		0x000000c2
>  #define MSR_FSB_FREQ			0x000000cd
> @@ -439,6 +445,7 @@
>  #define FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX	(1<<1)
>  #define FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX	(1<<2)
>  #define FEATURE_CONTROL_LMCE				(1<<20)
> +#define FEATURE_SET_IBPB				(1<<0)

So how is that bit related to the control bits above? This file is
structured in obvious ways ....

Thanks,

	tglx