From: Sean Christopherson <[email protected]> TDX is not supported on platforms with non-coherent IOMMUs, freak out if one is encountered, and because SEPT doesn't allow the memtype control that's needed to support non-coherent DMA.
Signed-off-by: Sean Christopherson <[email protected]> --- arch/x86/kvm/x86.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 5566e7f25ce6..05dbdfdd7a8b 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -11144,6 +11144,7 @@ EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device); void kvm_arch_register_noncoherent_dma(struct kvm *kvm) { + KVM_BUG_ON(kvm->arch.vm_type == KVM_X86_TDX_VM, kvm); atomic_inc(&kvm->arch.noncoherent_dma_count); } EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma); -- 2.17.1
