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authorMarc Zyngier <marc.zyngier@arm.com>2017-09-26 15:57:16 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2017-09-27 12:15:54 +0100
commit5371513fb338fb9989c569dc071326d369d6ade8 (patch)
tree2dd1cfbb2973f06740c382e6f7b13b7f38a952dc
parente19b205be43d11bff638cad4487008c48d21c103 (diff)
arm64: Make sure SPsel is always set
When the kernel is entered at EL2 on an ARMv8.0 system, we construct the EL1 pstate and make sure this uses the the EL1 stack pointer (we perform an exception return to EL1h). But if the kernel is either entered at EL1 or stays at EL2 (because we're on a VHE-capable system), we fail to set SPsel, and use whatever stack selection the higher exception level has choosen for us. Let's not take any chance, and make sure that SPsel is set to one before we decide the mode we're going to run in. Cc: <stable@vger.kernel.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
-rw-r--r--arch/arm64/kernel/head.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 7434ec0c7a27..0b243ecaf7ac 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -384,6 +384,7 @@ ENTRY(kimage_vaddr)
* booted in EL1 or EL2 respectively.
*/
ENTRY(el2_setup)
+ msr SPsel, #1 // We want to use SP_EL{1,2}
mrs x0, CurrentEL
cmp x0, #CurrentEL_EL2
b.eq 1f