Commit a1176ef5 authored by Sean Christopherson's avatar Sean Christopherson
Browse files

KVM: x86/mmu: Restrict KVM_SW_PROTECTED_VM to the TDP MMU 

Advertise and support software-protected VMs if and only if the TDP MMU is
enabled, i.e. disallow KVM_SW_PROTECTED_VM if TDP is enabled for KVM's
legacy/shadow MMU.  TDP support for the shadow MMU is maintenance-only,
e.g. support for TDX and SNP will also be restricted to the TDP MMU.

Fixes: 89ea60c2 ("KVM: x86: Add support for "protected VMs" that can utilize private memory")
Link: https://lore.kernel.org/r/20240222190612.2942589-4-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 42269209

arch/x86/kvm/x86.c

+1 −1
Original line number Diff line number Diff line
@@ -4580,7 +4580,7 @@ static bool kvm_is_vm_type_supported(unsigned long type) 
{

	return type == KVM_X86_DEFAULT_VM ||

	       (type == KVM_X86_SW_PROTECTED_VM &&

		IS_ENABLED(CONFIG_KVM_SW_PROTECTED_VM) && tdp_enabled);

		IS_ENABLED(CONFIG_KVM_SW_PROTECTED_VM) && tdp_mmu_enabled);

}



int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)