linux-kernel - Re: [PATCH 1/6] KVM: nVMX: we support 1GB EPT pages

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Message-ID: <9093c21b-183c-f47f-aee6-985d4be32e26@redhat.com>
Date:   Thu, 9 Mar 2017 11:34:34 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     bdas@...hat.com, dmatlack@...gle.com
Subject: Re: [PATCH 1/6] KVM: nVMX: we support 1GB EPT pages

Am 08.03.2017 um 19:03 schrieb Paolo Bonzini:
> Large pages at the PDPE level can be emulated by the MMU, so the bit
> can be set unconditionally in the EPT capabilities MSR.  The same is
> true of 2MB EPT pages, though all Intel processors with EPT in practice
> support those.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/kvm/vmx.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 283aa8601833..89b74d9bc357 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -2764,14 +2764,14 @@ static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx)
>  		vmx->nested.nested_vmx_secondary_ctls_high |=
>  			SECONDARY_EXEC_ENABLE_EPT;
>  		vmx->nested.nested_vmx_ept_caps = VMX_EPT_PAGE_WALK_4_BIT |
> -			 VMX_EPTP_WB_BIT | VMX_EPT_2MB_PAGE_BIT |
> -			 VMX_EPT_INVEPT_BIT;
> +			 VMX_EPTP_WB_BIT | VMX_EPT_INVEPT_BIT;
>  		if (cpu_has_vmx_ept_execute_only())
>  			vmx->nested.nested_vmx_ept_caps |=
>  				VMX_EPT_EXECUTE_ONLY_BIT;
>  		vmx->nested.nested_vmx_ept_caps &= vmx_capability.ept;
>  		vmx->nested.nested_vmx_ept_caps |= VMX_EPT_EXTENT_GLOBAL_BIT |
> -			VMX_EPT_EXTENT_CONTEXT_BIT;
> +			VMX_EPT_EXTENT_CONTEXT_BIT | VMX_EPT_2MB_PAGE_BIT |
> +			VMX_EPT_1GB_PAGE_BIT;
>  	} else
>  		vmx->nested.nested_vmx_ept_caps = 0;
>  
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David