linux-kernel - Re: [RFC PATCH v5 041/104] KVM: VMX: Move setting of EPT MMU masks to common VT-x code

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Date:   Tue, 5 Apr 2022 16:48:46 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     isaku.yamahata@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...il.com, Jim Mattson <jmattson@...gle.com>,
        erdemaktas@...gle.com, Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [RFC PATCH v5 041/104] KVM: VMX: Move setting of EPT MMU masks to
 common VT-x code

On 3/4/22 20:48, isaku.yamahata@...el.com wrote:
> From: Sean Christopherson <sean.j.christopherson@...el.com>
> 
> EPT MMU masks are used commonly for VMX and TDX.  The value needs to be
> initialized in common code before both VMX/TDX-specific initialization
> code.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---
>   arch/x86/kvm/vmx/main.c | 5 +++++
>   arch/x86/kvm/vmx/vmx.c  | 4 ----
>   2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
> index 3eb9db6d83ac..51aaafe6b432 100644
> --- a/arch/x86/kvm/vmx/main.c
> +++ b/arch/x86/kvm/vmx/main.c
> @@ -4,6 +4,7 @@
>   #include "x86_ops.h"
>   #include "vmx.h"
>   #include "nested.h"
> +#include "mmu.h"
>   #include "pmu.h"
>   #include "tdx.h"
>   
> @@ -22,6 +23,10 @@ static __init int vt_hardware_setup(void)
>   
>   	tdx_hardware_setup(&vt_x86_ops);
>   
> +	if (enable_ept)
> +		kvm_mmu_set_ept_masks(enable_ept_ad_bits,
> +				      cpu_has_vmx_ept_execute_only());
> +
>   	return 0;
>   }
>   
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 0edeeed0b4c8..07fd892768be 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -7817,10 +7817,6 @@ __init int vmx_hardware_setup(void)
>   
>   	set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
>   
> -	if (enable_ept)
> -		kvm_mmu_set_ept_masks(enable_ept_ad_bits,
> -				      cpu_has_vmx_ept_execute_only());
> -
>   	kvm_configure_mmu(enable_ept, 0, vmx_get_max_tdp_level(),
>   			  ept_caps_to_lpage_level(vmx_capability.ept));
>   

RB