From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
At this point, TDX supports TDP MMU and doesn't support legacy MMU.
Forcibly use TDP MMU for TDX irrelevant of kernel parameter to disable
TDP MMU.
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
arch/x86/kvm/mmu/tdp_mmu.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index b33ace3d4456..9df6aa4da202 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -16,7 +16,12 @@ module_param_named(tdp_mmu, tdp_mmu_enabled, bool, 0644);
/* Initializes the TDP MMU for the VM, if enabled. */
bool kvm_mmu_init_tdp_mmu(struct kvm *kvm)
{
- if (!tdp_enabled || !READ_ONCE(tdp_mmu_enabled))
+ /*
+ * Because TDX supports only TDP MMU, forcibly use TDP MMU in the case
+ * of TDX.
+ */
+ if (kvm->arch.vm_type != KVM_X86_TDX_VM &&
+ (!tdp_enabled || !READ_ONCE(tdp_mmu_enabled)))
return false;
/* This should not be changed for the lifetime of the VM. */
--
2.25.1
