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KVM: x86/mmu: Reject direct bits in gpa passed to KVM_PRE_FAULT_MEMORY

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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@google.com>.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2025-06-12 00:47:44 -04:00
parent aa2024c01a
commit 8046d29dde
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/mmu/mmu.c
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@ -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.