diff options
Diffstat (limited to 'arch/arm64/kvm/vgic/vgic-v5.c')
| -rw-r--r-- | arch/arm64/kvm/vgic/vgic-v5.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/arm64/kvm/vgic/vgic-v5.c b/arch/arm64/kvm/vgic/vgic-v5.c new file mode 100644 index 000000000000..6bdbb221bcde --- /dev/null +++ b/arch/arm64/kvm/vgic/vgic-v5.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <kvm/arm_vgic.h> +#include <linux/irqchip/arm-vgic-info.h> + +#include "vgic.h" + +/* + * Probe for a vGICv5 compatible interrupt controller, returning 0 on success. + * Currently only supports GICv3-based VMs on a GICv5 host, and hence only + * registers a VGIC_V3 device. + */ +int vgic_v5_probe(const struct gic_kvm_info *info) +{ + u64 ich_vtr_el2; + int ret; + + if (!info->has_gcie_v3_compat) + return -ENODEV; + + kvm_vgic_global_state.type = VGIC_V5; + kvm_vgic_global_state.has_gcie_v3_compat = true; + + /* We only support v3 compat mode - use vGICv3 limits */ + kvm_vgic_global_state.max_gic_vcpus = VGIC_V3_MAX_CPUS; + + kvm_vgic_global_state.vcpu_base = 0; + kvm_vgic_global_state.vctrl_base = NULL; + kvm_vgic_global_state.can_emulate_gicv2 = false; + kvm_vgic_global_state.has_gicv4 = false; + kvm_vgic_global_state.has_gicv4_1 = false; + + ich_vtr_el2 = kvm_call_hyp_ret(__vgic_v3_get_gic_config); + kvm_vgic_global_state.ich_vtr_el2 = (u32)ich_vtr_el2; + + /* + * The ListRegs field is 5 bits, but there is an architectural + * maximum of 16 list registers. Just ignore bit 4... + */ + kvm_vgic_global_state.nr_lr = (ich_vtr_el2 & 0xf) + 1; + + ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V3); + if (ret) { + kvm_err("Cannot register GICv3-legacy KVM device.\n"); + return ret; + } + + static_branch_enable(&kvm_vgic_global_state.gicv3_cpuif); + kvm_info("GCIE legacy system register CPU interface\n"); + + return 0; +} |