[PATCH 2/3] KVM: x86: leave the legacy private attribute in for TDX and SEV

[Paolo Bonzini]

As of today, and presumably as of Linux 7.4's release date, there
is hardly any VMM that supports guest_memfd attributes.  Support the
legacy VM attribute for private memory if SEV or TDX are requested;
default it to disabled if only the software-protected VM is requested,
since it is only used by guest_memfd selftests.

While in-place conversion is the best option, it is way too
early to enable it by default.

Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 arch/x86/kvm/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 01a683a9042a..4f7d75ec8c40 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -80,6 +80,7 @@ config KVM_PRIVATE_MEMATTR_VM
 	bool "Enable per-VM PRIVATE vs. SHARED attributes (for CoCo VMs)"
 	depends on KVM_SW_PROTECTED_VM || KVM_INTEL_TDX || KVM_AMD_SEV
 	select KVM_VM_MEMORY_ATTRIBUTES
+	default KVM_INTEL_TDX || KVM_AMD_SEV
 	help
 	  Enable support for tracking PRIVATE vs. SHARED memory using per-VM
 	  memory attributes.  Using per-VM attributes is deprecated in favor of
@@ -87,7 +88,7 @@ config KVM_PRIVATE_MEMATTR_VM
 	  CoCo VMs using a VMM that doesn't support guest_memfd memory
 	  attributes.
 
-	  If unsure, say N.
+	  If unsure, say "Y".
 
 config KVM_SW_PROTECTED_VM
 	bool "Enable support for KVM software-protected VMs"
-- 
2.52.0