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Message-Id: <fa0cba75850470e3e46bf370aa921aa5d43fc64a.1605232743.git.isaku.yamahata@intel.com>
Date: Mon, 16 Nov 2020 10:26:50 -0800
From: isaku.yamahata@...el.com
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H . Peter Anvin" <hpa@...or.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, x86@...nel.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: isaku.yamahata@...el.com, isaku.yamahata@...il.com,
Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [RFC PATCH 65/67] KVM: x86: Mark the VM (TD) as bugged if non-coherent DMA is detected
From: Sean Christopherson <sean.j.christopherson@...el.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@...el.com>
---
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
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