KVM: x86/mmu: Return -EIO if page fault returns RET_PF_INVALID
Exit to userspace with an error if the MMU is buggy and returns RET_PF_INVALID when servicing a page fault. This will allow a future patch to invert the emulation path, i.e. emulate only on RET_PF_EMULATE instead of emulating on anything but RET_PF_RETRY. This technically means that KVM will exit to userspace instead of emulating on RET_PF_INVALID, but practically speaking it's a nop as the MMU never returns RET_PF_INVALID. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200923220425.18402-2-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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