tree 1053c6724fb0792180474facad5cb08f12f603c0
parent ace01eaf6ba62423ed80bffe191dc818681805b0
author Kalesh Singh <kaleshsingh@google.com> 1658479996 -0700
committer Kalesh Singh <kaleshsingh@google.com> 1658520047 -0700

KVM: arm64: Introduce DEFINE_PER_CPU_NVHE_SHARED

DEFINE_PER_CPU_NVHE_SHARED(...) can be used to define per-cpu
variables shared between the protected-nVHE and the hypervisor.

In non-protected mode, the host can directly access nVHE memory,
so only use this for data that also needs to be shared in protected
mode (pKVM).

The regular per-cpu macros and helpers can be reused used with per-cpu
variables defined as shared. Only the definition needs to be marked
shared (_NVHE_SHARED). Marking a variable shared doesn't create a new
section, rather carves a page aligned chunk from .data..percpu and
groups the shared data there. It needs to be page aligned since the
host
stage 2 protection has per-page granularity.

Signed-off-by: Kalesh Singh <kaleshsingh@google.com>