tree d4cf914533577f0e5cfb27334336f8f89ad7f0c1
parent 686d038fd2b04d3e67c95a315fbcb122e5fce246
author Andrew Scull <ascull@google.com> 1612284252 +0000
committer Andrew Scull <ascull@google.com> 1613396502 +0000

RFC: KVM: arm64: Manage FPSIMD state at EL2 for protected vCPUs

Protected VM's FPSIMD state must not be exposed to the host. Since the
FPSIMD state is switched lazily, hyp must take precautions to prevent
leaks. Do this by trapping FP access to EL2 to lazily save a protected
guest's and restore the hosts's state.

This is a little ahead of its time since it requires knowledge which
vcpus are protected or not (see the TODO).

Signed-off-by: Andrew Scull <ascull@google.com>