arm64: rsi: use linear-map alias for realm config buffer

rsi_get_realm_config() passes its argument to virt_to_phys(), but
&config is a kernel image address and not a linear-map alias.
On arm64 this triggers the below warning:

 virt_to_phys used for non-linear address: (____ptrval____) (config+0x0/0x1000)
 WARNING: arch/arm64/mm/physaddr.c:15 at __virt_to_phys+0x50/0x70, CPU#0: swapper/0
 Modules linked in:
 .....
 Hardware name: linux,dummy-virt (DT)
 pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : __virt_to_phys+0x50/0x70
 lr : __virt_to_phys+0x4c/0x70
 .....
 ......
 Call trace:
  __virt_to_phys+0x50/0x70 (P)
  arm64_rsi_init+0xa0/0x1b8
  setup_arch+0x13c/0x1a0
  start_kernel+0x68/0x398
  __primary_switched+0x88/0x90

Pass lm_alias(&config) instead so the RSI call uses the linear-map
alias of the same buffer and avoids the boot-time warning.

Signed-off-by: Aneesh Kumar K.V (Arm) <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

Author: kvaneesh

arch/arm64/kernel/rsi.c

@@ -144,7 +144,7 @@ void __init arm64_rsi_init(void)
 		return;
 	if (!rsi_version_matches())
 		return;
-	if (WARN_ON(rsi_get_realm_config(&config)))
+	if (WARN_ON(rsi_get_realm_config(lm_alias(&config))))
 		return;
 	prot_ns_shared = BIT(config.ipa_bits - 1);