At the moment, we only save/restore lr if on VHE, as we rely only the EL1 code to have preserved it in the non-VHE case. As we're about to get rid of the latter, let's move the save/restore code to the do_el2_call macro, unifying both code paths. Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> --- arch/arm64/kvm/hyp.S | 3 --- arch/arm64/kvm/hyp/hyp-entry.S | 4 ++-- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index 2726635dceba..f6f20b58d65a 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -38,13 +38,10 @@ * A function pointer with a value less than 0xfff has a special meaning, * and is used to implement __hyp_get_vectors in the same way as in * arch/arm64/kernel/hyp_stub.S. - * HVC behaves as a 'bl' call and will clobber lr. */ ENTRY(__kvm_call_hyp) alternative_if_not ARM64_HAS_VIRT_HOST_EXTN - str lr, [sp, #-16]! hvc #0 - ldr lr, [sp], #16 ret alternative_else_nop_endif b __vhe_hyp_call diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S index 5e9052f087f2..d8ef788646c6 100644 --- a/arch/arm64/kvm/hyp/hyp-entry.S +++ b/arch/arm64/kvm/hyp/hyp-entry.S @@ -32,17 +32,17 @@ * Shuffle the parameters before calling the function * pointed to in x0. Assumes parameters in x[1,2,3]. */ + str lr, [sp, #-16]! mov lr, x0 mov x0, x1 mov x1, x2 mov x2, x3 blr lr + ldr lr, [sp], #16 .endm ENTRY(__vhe_hyp_call) - str lr, [sp, #-16]! do_el2_call - ldr lr, [sp], #16 /* * We used to rely on having an exception return to get * an implicit isb. In the E2H case, we don't have it anymore. -- 2.11.0 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
