From 59da1cbfd840d69bd7a310249924da3fc202c417 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 9 Jun 2017 12:49:33 +0100 Subject: KVM: arm64: vgic-v3: Add hook to handle guest GICv3 sysreg accesses at EL2 In order to start handling guest access to GICv3 system registers, let's add a hook that will get called when we trap a system register access. This is gated by a new static key (vgic_v3_cpuif_trap). Tested-by: Alexander Graf Acked-by: David Daney Reviewed-by: Eric Auger Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall --- arch/arm64/kvm/hyp/switch.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'arch/arm64/kvm') diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index e5f089de6526..945e79c641c4 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -350,6 +350,20 @@ again: } } + if (static_branch_unlikely(&vgic_v3_cpuif_trap) && + exit_code == ARM_EXCEPTION_TRAP && + (kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_SYS64 || + kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_CP15_32)) { + int ret = __vgic_v3_perform_cpuif_access(vcpu); + + if (ret == 1) { + __skip_instr(vcpu); + goto again; + } + + /* 0 falls through to be handled out of EL2 */ + } + fp_enabled = __fpsimd_enabled(); __sysreg_save_guest_state(guest_ctxt); -- cgit v1.2.3-59-g8ed1b