[PATCH 1/4] KVM: arm64: Enable Pointer Authentication at EL2 if available
From: Marc Zyngier <maz@kernel.org>
Date: 2020-06-15 08:20:36
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
While initializing EL2, switch Pointer Authentication if detected from EL1. We use the EL1-provided keys though. Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/kvm/hyp-init.S | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
index 6e6ed5581eed..81732177507d 100644
--- a/arch/arm64/kvm/hyp-init.S
+++ b/arch/arm64/kvm/hyp-init.S@@ -104,6 +104,17 @@ alternative_else_nop_endif */ mov_q x4, (SCTLR_EL2_RES1 | (SCTLR_ELx_FLAGS & ~SCTLR_ELx_A)) CPU_BE( orr x4, x4, #SCTLR_ELx_EE) +alternative_if ARM64_HAS_ADDRESS_AUTH_ARCH + b 1f +alternative_else_nop_endif +alternative_if_not ARM64_HAS_ADDRESS_AUTH_IMP_DEF + b 2f +alternative_else_nop_endif +1: + orr x4, x4, #(SCTLR_ELx_ENIA | SCTLR_ELx_ENIB) + orr x4, x4, #SCTLR_ELx_ENDA + orr x4, x4, #SCTLR_ELx_ENDB +2: msr sctlr_el2, x4 isb
--
2.27.0
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