Commit 4f67cf7e authored by Sean Christopherson's avatar Sean Christopherson
Browse files

KVM: SEV: WARN on unhandled VM type when initializing VM 

WARN if KVM encounters an unhandled VM type when setting up flags for SEV+
VMs, e.g. to guard against adding a new flavor of SEV without adding proper
recognition in sev_vm_init().

Practically speaking, no functional change intended (the new "default" case
should be unreachable).

Link: https://patch.msgid.link/20260310234829.2608037-13-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent e353f1be

arch/x86/kvm/svm/sev.c

+18 −11
Original line number Diff line number Diff line
@@ -2927,17 +2927,24 @@ static int snp_decommission_context(struct kvm *kvm) 


void sev_vm_init(struct kvm *kvm)

{

	int type = kvm->arch.vm_type;



	if (type == KVM_X86_DEFAULT_VM || type == KVM_X86_SW_PROTECTED_VM)

		return;



	kvm->arch.has_protected_state = (type == KVM_X86_SEV_ES_VM ||

					 type == KVM_X86_SNP_VM);

	to_kvm_sev_info(kvm)->need_init = true;



	kvm->arch.has_private_mem = (type == KVM_X86_SNP_VM);

	switch (kvm->arch.vm_type) {

	case KVM_X86_DEFAULT_VM:

	case KVM_X86_SW_PROTECTED_VM:

		break;

	case KVM_X86_SNP_VM:

		kvm->arch.has_private_mem = true;

		fallthrough;

	case KVM_X86_SEV_ES_VM:

		kvm->arch.has_protected_state = true;

		fallthrough;

	case KVM_X86_SEV_VM:

		kvm->arch.pre_fault_allowed = !kvm->arch.has_private_mem;

		to_kvm_sev_info(kvm)->need_init = true;

		break;

	default:

		WARN_ONCE(1, "Unsupported VM type %u", kvm->arch.vm_type);

		break;

	}

}



void sev_vm_destroy(struct kvm *kvm)