Only let userspace pass the same addresses that were used in KVM_SET_USER_MEMORY_REGION (or KVM_SET_USER_MEMORY_REGION2); gpas in the the upper half of the address space are an implementation detail of TDX and KVM. Extracted from a patch by Sean Christopherson <seanjc@xxxxxxxxxx>. Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> --- arch/x86/kvm/mmu/mmu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index a4040578b537..4e06e2e89a8f 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4903,6 +4903,9 @@ long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu, if (!vcpu->kvm->arch.pre_fault_allowed) return -EOPNOTSUPP; + if (kvm_is_gfn_alias(vcpu->kvm, gpa_to_gfn(range->gpa))) + return -EINVAL; + /* * reload is efficient when called repeatedly, so we can do it on * every iteration. -- 2.43.5
