diff mbox series

[RFC,65/67] KVM: x86: Mark the VM (TD) as bugged if non-coherent DMA is detected

Message ID fa0cba75850470e3e46bf370aa921aa5d43fc64a.1605232743.git.isaku.yamahata@intel.com (mailing list archive)
State New, archived
Headers show
Series KVM: X86: TDX support | expand

Commit Message

Isaku Yamahata Nov. 16, 2020, 6:26 p.m. UTC 
From: Sean Christopherson <sean.j.christopherson@intel.com>

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 <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/x86.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

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);