Re: [PATCH 1/4] KVM: arm64: Enable Pointer Authentication at EL2 if available
From: Andrew Scull <hidden>
Date: 2020-06-15 08:51:21
Also in:
kvm, kvmarm
On Mon, Jun 15, 2020 at 09:19:51AM +0100, Marc Zyngier wrote:
While initializing EL2, switch Pointer Authentication if detected
^ nit: on?
quoted hunk ↗ jump to hunk
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
mm/proc.S builds the mask with ldr and ors it in one go, would be nice to use the same pattern.
+2: msr sctlr_el2, x4 isb
Acked-by: Andrew Scull <redacted> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel