linux-kernel - Re: [PATCH v17 04/24] KVM: x86: Select TDX's KVM_GENERIC_xxx dependencies iff CONFIG_KVM_INTEL

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Message-ID: <CA+EHjTxHk4hsPXDiUY2nOfGdT9GjPvu7YdNKApkUJK4RjBKB4Q@mail.gmail.com>
Date: Thu, 31 Jul 2025 09:07:49 +0100
From: Fuad Tabba <tabba@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, kvm@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>, 
	Gavin Shan <gshan@...hat.com>, Shivank Garg <shivankg@....com>, Vlastimil Babka <vbabka@...e.cz>, 
	Xiaoyao Li <xiaoyao.li@...el.com>, David Hildenbrand <david@...hat.com>, 
	Ackerley Tng <ackerleytng@...gle.com>, Tao Chan <chentao@...inos.cn>, 
	James Houghton <jthoughton@...gle.com>
Subject: Re: [PATCH v17 04/24] KVM: x86: Select TDX's KVM_GENERIC_xxx
 dependencies iff CONFIG_KVM_INTEL_TDX=y

On Tue, 29 Jul 2025 at 23:55, Sean Christopherson <seanjc@...gle.com> wrote:
>
> Select KVM_GENERIC_PRIVATE_MEM and KVM_GENERIC_MEMORY_ATTRIBUTES directly
> from KVM_INTEL_TDX, i.e. if and only if TDX support is fully enabled in
> KVM.  There is no need to enable KVM's private memory support just because
> the core kernel's INTEL_TDX_HOST is enabled.
>
> Reviewed-by: Xiaoyao Li <xiaoyao.li@...el.com>
> Reviewed-by: David Hildenbrand <david@...hat.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---


Reviewed-by: Fuad Tabba <tabba@...gle.com>

Cheers,
/fuad

>  arch/x86/kvm/Kconfig | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index 402ba00fdf45..13ab7265b505 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -95,8 +95,6 @@ config KVM_SW_PROTECTED_VM
>  config KVM_INTEL
>         tristate "KVM for Intel (and compatible) processors support"
>         depends on KVM && IA32_FEAT_CTL
> -       select KVM_GENERIC_PRIVATE_MEM if INTEL_TDX_HOST
> -       select KVM_GENERIC_MEMORY_ATTRIBUTES if INTEL_TDX_HOST
>         help
>           Provides support for KVM on processors equipped with Intel's VT
>           extensions, a.k.a. Virtual Machine Extensions (VMX).
> @@ -135,6 +133,8 @@ config KVM_INTEL_TDX
>         bool "Intel Trust Domain Extensions (TDX) support"
>         default y
>         depends on INTEL_TDX_HOST
> +       select KVM_GENERIC_PRIVATE_MEM
> +       select KVM_GENERIC_MEMORY_ATTRIBUTES
>         help
>           Provides support for launching Intel Trust Domain Extensions (TDX)
>           confidential VMs on Intel processors.
> --
> 2.50.1.552.g942d659e1b-goog
>