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) <aneesh.kumar@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/rsi.c b/arch/arm64/kernel/rsi.c
index c64a06f58c0bc0d1e9e95d5a489d9f65c0e037c7..6e883bc431864aa13db1f574a0a3bc0d6c5c3afe 100644 (file)
--- a/arch/arm64/kernel/rsi.c
+++ b/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);