linux-kernel - Re: [PATCH] KVM: VMX: Add VMX_FEATURE_USR_WAIT

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Date:   Mon, 17 Feb 2020 09:52:36 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] KVM: VMX: Add VMX_FEATURE_USR_WAIT_PAUSE

Xiaoyao Li <xiaoyao.li@...el.com> writes:

> Commit 159348784ff0 ("x86/vmx: Introduce VMX_FEATURES_*") missed
> bit 26 (enable user wait and pause) of Secondary Processor-based
> VM-Execution Controls.
>
> Add VMX_FEATURE_USR_WAIT_PAUSE flag and use it to define
> SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE to make them uniformly.
>
> Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
> ---
>  arch/x86/include/asm/vmx.h         | 2 +-
>  arch/x86/include/asm/vmxfeatures.h | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index 2a85287b3685..8521af3fef27 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -72,7 +72,7 @@
>  #define SECONDARY_EXEC_MODE_BASED_EPT_EXEC	VMCS_CONTROL_BIT(MODE_BASED_EPT_EXEC)
>  #define SECONDARY_EXEC_PT_USE_GPA		VMCS_CONTROL_BIT(PT_USE_GPA)
>  #define SECONDARY_EXEC_TSC_SCALING              VMCS_CONTROL_BIT(TSC_SCALING)
> -#define SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE	0x04000000
> +#define SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE	VMCS_CONTROL_BIT(USR_WAIT_PAUSE)
>  
>  #define PIN_BASED_EXT_INTR_MASK                 VMCS_CONTROL_BIT(INTR_EXITING)
>  #define PIN_BASED_NMI_EXITING                   VMCS_CONTROL_BIT(NMI_EXITING)
> diff --git a/arch/x86/include/asm/vmxfeatures.h b/arch/x86/include/asm/vmxfeatures.h
> index a50e4a0de315..1408f526bd90 100644
> --- a/arch/x86/include/asm/vmxfeatures.h
> +++ b/arch/x86/include/asm/vmxfeatures.h
> @@ -81,6 +81,7 @@
>  #define VMX_FEATURE_MODE_BASED_EPT_EXEC	( 2*32+ 22) /* "ept_mode_based_exec" Enable separate EPT EXEC bits for supervisor vs. user */
>  #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_USR_WAIT_PAUSE	( 2*32+ 26) /* "" Enable TPAUSE, UMONITOR, UMWATI in guest */

"UMWAIT"

>  #define VMX_FEATURE_ENCLV_EXITING	( 2*32+ 28) /* "" VM-Exit on ENCLV (leaf dependent) */
>  
>  #endif /* _ASM_X86_VMXFEATURES_H */

With the typo fixed (likely upon commit),

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

-- 
Vitaly