Drivers: hv: Mark shared memory as decrypted for CCA Realms

In hv_common_cpu_init(), the per-CPU hypercall input/output pages need
to be marked as decrypted (shared) for confidential VM isolation types.
This is already done for SNP and TDX isolation; extend the same handling
to Arm CCA Realm guests so that the host hypervisor can access the
shared hypercall buffers.

is_realm_world() is declared in include/linux/arm-rsi-cmds.h which only
builds on arm64 (it includes <asm/memory.h>), so using it directly in
the arch-neutral drivers/hv/hv_common.c would break the x86 build.
Introduce a Hyper-V-specific helper following the established
hv_isolation_type_snp() / hv_isolation_type_tdx() pattern.

On architectures other than arm64 the weak default keeps the existing
behaviour.

Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Kameron Carr <kameroncarr@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>

0 files changed, 0 insertions, 0 deletions