arm64/kvm: disable access to AMU registers from kvm guests

Access to the AMU counters should be disabled by default in kvm guests,
as information from the counters might reveal activity in other guests
or activity on the host.

Therefore, disable access to AMU registers from EL0 and EL1 in kvm
guests by:
 - Hiding the presence of the extension in the feature register
   (SYS_ID_AA64PFR0_EL1) on the VCPU.
 - Disabling access to the AMU registers before switching to the guest.
 - Trapping accesses and injecting an undefined instruction into the
   guest.

Signed-off-by: Ionela Voinescu <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Reviewed-by: Valentin Schneider <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Julien Thierry <[email protected]>
Cc: James Morse <[email protected]>
Cc: Marc Zyngier <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

0 files changed, 0 insertions, 0 deletions