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Subject[PATCH v11 039/113] KVM: x86/mmu: Require TDP MMU for TDX
Date
From: Isaku Yamahata <isaku.yamahata@intel.com>

Require the TDP MMU for guest TDs, the so called "shadow" MMU does not
support mapping guest private memory, i.e. does not support Secure-EPT.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/mmu/tdp_mmu.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index fdcff390ebc2..6c3ce4121a46 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -27,6 +27,13 @@ int kvm_mmu_init_tdp_mmu(struct kvm *kvm)
if (kvm->arch.vm_type == KVM_X86_TDX_VM && !enable_mmio_caching)
return -EOPNOTSUPP;

+ /*
+ * Because only the TDP MMU supports TDX, require the TDP MMU for guest
+ * TDs.
+ */
+ if (kvm->arch.vm_type == KVM_X86_TDX_VM && !tdp_enabled)
+ return -EOPNOTSUPP;
+
if (!tdp_enabled || !READ_ONCE(tdp_mmu_enabled))
return 0;

--
2.25.1
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