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authorMarc Zyngier <marc.zyngier@arm.com>2017-09-26 14:57:16 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-10-05 07:44:02 (GMT)
commit7dbd64284b18423c7c81ceb6911de472d1bbadcf (patch)
tree15249b3657285d9f4a4d85a9cea1a18ea5d446ca /arch/arm64
parentbe69c4c00a68210e6ca5eb669b6e8d7e1ac00cb8 (diff)
downloadlinux-7dbd64284b18423c7c81ceb6911de472d1bbadcf.tar.xz
arm64: Make sure SPsel is always set
commit 5371513fb338fb9989c569dc071326d369d6ade8 upstream. 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. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64')
-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 332e331..539bebc 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -486,6 +486,7 @@ 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.ne 1f