| From | isaku.yamahata@intel ... | Subject | [PATCH v11 039/113] KVM: x86/mmu: Require TDP MMU for TDX | Date | Thu, 12 Jan 2023 08:31:47 -0800 |
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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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