Re: [PATCH v8 03/46] KVM: Move KVM_VM_MEMORY_ATTRIBUTES config definition to x86

[Xiaoyao Li]

On 6/19/2026 8:31 AM, Ackerley Tng via B4 Relay wrote:
> From: Sean Christopherson<seanjc@xxxxxxxxxx>
>
> Bury KVM_VM_MEMORY_ATTRIBUTES in x86 to discourage other architectures
> from adding support for per-VM memory attributes, because tracking private
> vs. shared memory on a per-VM basis is now deprecated in favor of tracking
> on a per-guest_memfd basis, and while RWX memory attributes are on the
> horizon, they too are expected to be x86-only.
>
> This will also allow modifying KVM_VM_MEMORY_ATTRIBUTES to be
> user-selectable (in x86) without creating weirdness in KVM's Kconfigs.
> Now that guest_memfd supports in-place conversions, it's entirely possible
> to run x86 CoCo VMs without support for KVM_VM_MEMORY_ATTRIBUTES.
>
> Leave the code itself in common KVM so that it's trivial to undo this
> change if new per-VM attributes do come along.
>
> Signed-off-by: Sean Christopherson<seanjc@xxxxxxxxxx>
> Reviewed-by: Fuad Tabba<tabba@xxxxxxxxxx>
> Signed-off-by: Ackerley Tng<ackerleytng@xxxxxxxxxx>

Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>