target/arm: Honor HCR_EL2.TID2 trapping requirements

target/arm: Honor HCR_EL2.TID2 trapping requirements

HCR_EL2.TID2 mandates that access from EL1 to CTR_EL0, CCSIDR_EL1,
CCSIDR2_EL1, CLIDR_EL1, CSSELR_EL1 are trapped to EL2, and QEMU
completely ignores it, making it impossible for hypervisors to
virtualize the cache hierarchy.

Do the right thing by trapping to EL2 if HCR_EL2.TID2 is set.

Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Edgar E. Iglesias <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Message-id: 20191201122018[email protected]
Signed-off-by: Peter Maydell <[email protected]>