1*8a43a2b3SChristoffer Dall /* 2*8a43a2b3SChristoffer Dall * Copyright (C) 2012-2015 - ARM Ltd 3*8a43a2b3SChristoffer Dall * Author: Marc Zyngier <marc.zyngier@arm.com> 4*8a43a2b3SChristoffer Dall * 5*8a43a2b3SChristoffer Dall * This program is free software; you can redistribute it and/or modify 6*8a43a2b3SChristoffer Dall * it under the terms of the GNU General Public License version 2 as 7*8a43a2b3SChristoffer Dall * published by the Free Software Foundation. 8*8a43a2b3SChristoffer Dall * 9*8a43a2b3SChristoffer Dall * This program is distributed in the hope that it will be useful, 10*8a43a2b3SChristoffer Dall * but WITHOUT ANY WARRANTY; without even the implied warranty of 11*8a43a2b3SChristoffer Dall * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12*8a43a2b3SChristoffer Dall * GNU General Public License for more details. 13*8a43a2b3SChristoffer Dall * 14*8a43a2b3SChristoffer Dall * You should have received a copy of the GNU General Public License 15*8a43a2b3SChristoffer Dall * along with this program. If not, see <http://www.gnu.org/licenses/>. 16*8a43a2b3SChristoffer Dall */ 17*8a43a2b3SChristoffer Dall 18*8a43a2b3SChristoffer Dall #include <linux/compiler.h> 19*8a43a2b3SChristoffer Dall #include <linux/irqchip/arm-gic.h> 20*8a43a2b3SChristoffer Dall #include <linux/kvm_host.h> 21*8a43a2b3SChristoffer Dall 22*8a43a2b3SChristoffer Dall #include <asm/kvm_emulate.h> 23*8a43a2b3SChristoffer Dall #include <asm/kvm_hyp.h> 24*8a43a2b3SChristoffer Dall #include <asm/kvm_mmu.h> 25*8a43a2b3SChristoffer Dall 26*8a43a2b3SChristoffer Dall /* 27*8a43a2b3SChristoffer Dall * __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the 28*8a43a2b3SChristoffer Dall * guest. 29*8a43a2b3SChristoffer Dall * 30*8a43a2b3SChristoffer Dall * @vcpu: the offending vcpu 31*8a43a2b3SChristoffer Dall * 32*8a43a2b3SChristoffer Dall * Returns: 33*8a43a2b3SChristoffer Dall * 1: GICV access successfully performed 34*8a43a2b3SChristoffer Dall * 0: Not a GICV access 35*8a43a2b3SChristoffer Dall * -1: Illegal GICV access 36*8a43a2b3SChristoffer Dall */ 37*8a43a2b3SChristoffer Dall int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu) 38*8a43a2b3SChristoffer Dall { 39*8a43a2b3SChristoffer Dall struct kvm *kvm = kern_hyp_va(vcpu->kvm); 40*8a43a2b3SChristoffer Dall struct vgic_dist *vgic = &kvm->arch.vgic; 41*8a43a2b3SChristoffer Dall phys_addr_t fault_ipa; 42*8a43a2b3SChristoffer Dall void __iomem *addr; 43*8a43a2b3SChristoffer Dall int rd; 44*8a43a2b3SChristoffer Dall 45*8a43a2b3SChristoffer Dall /* Build the full address */ 46*8a43a2b3SChristoffer Dall fault_ipa = kvm_vcpu_get_fault_ipa(vcpu); 47*8a43a2b3SChristoffer Dall fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0); 48*8a43a2b3SChristoffer Dall 49*8a43a2b3SChristoffer Dall /* If not for GICV, move on */ 50*8a43a2b3SChristoffer Dall if (fault_ipa < vgic->vgic_cpu_base || 51*8a43a2b3SChristoffer Dall fault_ipa >= (vgic->vgic_cpu_base + KVM_VGIC_V2_CPU_SIZE)) 52*8a43a2b3SChristoffer Dall return 0; 53*8a43a2b3SChristoffer Dall 54*8a43a2b3SChristoffer Dall /* Reject anything but a 32bit access */ 55*8a43a2b3SChristoffer Dall if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32)) 56*8a43a2b3SChristoffer Dall return -1; 57*8a43a2b3SChristoffer Dall 58*8a43a2b3SChristoffer Dall /* Not aligned? Don't bother */ 59*8a43a2b3SChristoffer Dall if (fault_ipa & 3) 60*8a43a2b3SChristoffer Dall return -1; 61*8a43a2b3SChristoffer Dall 62*8a43a2b3SChristoffer Dall rd = kvm_vcpu_dabt_get_rd(vcpu); 63*8a43a2b3SChristoffer Dall addr = kern_hyp_va((kern_hyp_va(&kvm_vgic_global_state))->vcpu_base_va); 64*8a43a2b3SChristoffer Dall addr += fault_ipa - vgic->vgic_cpu_base; 65*8a43a2b3SChristoffer Dall 66*8a43a2b3SChristoffer Dall if (kvm_vcpu_dabt_iswrite(vcpu)) { 67*8a43a2b3SChristoffer Dall u32 data = vcpu_data_guest_to_host(vcpu, 68*8a43a2b3SChristoffer Dall vcpu_get_reg(vcpu, rd), 69*8a43a2b3SChristoffer Dall sizeof(u32)); 70*8a43a2b3SChristoffer Dall writel_relaxed(data, addr); 71*8a43a2b3SChristoffer Dall } else { 72*8a43a2b3SChristoffer Dall u32 data = readl_relaxed(addr); 73*8a43a2b3SChristoffer Dall vcpu_set_reg(vcpu, rd, vcpu_data_host_to_guest(vcpu, data, 74*8a43a2b3SChristoffer Dall sizeof(u32))); 75*8a43a2b3SChristoffer Dall } 76*8a43a2b3SChristoffer Dall 77*8a43a2b3SChristoffer Dall return 1; 78*8a43a2b3SChristoffer Dall } 79