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KVM: x86/mmu: Guard against collision with KVM-defined PFERR_IMPLICIT…
…_ACCESS Add an assertion in kvm_mmu_page_fault() to ensure the error code provided by hardware doesn't conflict with KVM's software-defined IMPLICIT_ACCESS flag. In the unlikely scenario that future hardware starts using bit 48 for a hardware-defined flag, preserving the bit could result in KVM incorrectly interpreting the unknown flag as KVM's IMPLICIT_ACCESS flag. WARN so that any such conflict can be surfaced to KVM developers and resolved, but otherwise ignore the bit as KVM can't possibly rely on a flag it knows nothing about. Fixes: 4f4aa80 ("KVM: X86: Handle implicit supervisor access with SMAP") Acked-by: Kai Huang <kai.huang@intel.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Link: https://lore.kernel.org/r/20230721223711.2334426-1-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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