From: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Steven Price <steven.price@arm.com>,
Gavin Shan <gshan@redhat.com>
Subject: [PATCH] arm64: rsi: use linear-map alias for realm config buffer
Date: Tue, 7 Apr 2026 20:59:00 +0530 [thread overview]
Message-ID: <20260407152900.396431-1-aneesh.kumar@kernel.org> (raw)
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>
---
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Steven Price <steven.price@arm.com>
Cc: Gavin Shan <gshan@redhat.com>
---
arch/arm64/kernel/rsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/rsi.c b/arch/arm64/kernel/rsi.c
index 9e846ce4ef9c..92160f2e57ff 100644
--- a/arch/arm64/kernel/rsi.c
+++ b/arch/arm64/kernel/rsi.c
@@ -145,7 +145,7 @@ 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 = __phys_to_pte_val(BIT(config.ipa_bits - 1));
--
2.43.0
reply other threads:[~2026-04-07 15:29 UTC|newest]
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