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

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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: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-03-10 16:48:20 -07:00
parent e353f1beed
commit 4f67cf7e7e
1 changed files with 18 additions and 11 deletions
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29
arch/x86/kvm/svm/sev.c
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@ -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);
kvm->arch.pre_fault_allowed = !kvm->arch.has_private_mem;
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)