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i386/tdx: Error and exit when named cpu model is requested

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Currently, it gets below error when requesting any named cpu model with
"-cpu" to boot a TDX VM:

  qemu-system-x86_64: KVM_TDX_INIT_VM failed: Invalid argument

It misleads people to think it's the bug of KVM or QEMU. It is just that
current QEMU doesn't support named cpu model for TDX.

To support named cpu models for TDX guest, there are opens to be
finalized and needs a mount of additional work.

For now, explicitly check the case when named cpu model is requested.
Error report a hint and exit.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20250612133801.2238342-1-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2025-06-12 09:38:01 -04:00 • committed by Paolo Bonzini
parent 00268e0002
commit 750560f8a8
1 changed files with 6 additions and 0 deletions
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6
target/i386/kvm/tdx.c
View file

@ -739,8 +739,14 @@ static int tdx_kvm_type(X86ConfidentialGuest *cg)
static void tdx_cpu_instance_init(X86ConfidentialGuest *cg, CPUState *cpu)
{
X86CPUClass *xcc = X86_CPU_GET_CLASS(cpu);
X86CPU *x86cpu = X86_CPU(cpu);
if (xcc->model) {
error_report("Named cpu model is not supported for TDX yet!");
exit(1);
}
object_property_set_bool(OBJECT(cpu), "pmu", false, &error_abort);
/* invtsc is fixed1 for TD guest */