KVM: arm64: Implement HVC handling for protected guests at EL2

Extend kvm_handle_pvm_hvc64() to handle SMCCC_VERSION,
SMCCC_ARCH_FEATURES and the vendor hypervisor call UID at EL2, so
these queries don't reach the host. ARCH_FEATURES is mandatory from
SMCCC 1.1, the version EL2 implements: it returns SUCCESS for itself and
for SMCCC_VERSION, NOT_SUPPORTED for anything else, and handles the
ARCH_WORKAROUND_1/2/3 queries as the host does, from a copy of the
host's mitigation state taken at init with the sanitised ID registers.
The workaround calls themselves are already handled on hyp entry.

Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20261001135711.1640520-10-fuad.tabba@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>

0 files changed, 0 insertions, 0 deletions