1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012-2015 - ARM Ltd 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 */ 6 7 #include <linux/compiler.h> 8 #include <linux/irqchip/arm-gic.h> 9 #include <linux/kvm_host.h> 10 #include <linux/swab.h> 11 12 #include <asm/kvm_emulate.h> 13 #include <asm/kvm_hyp.h> 14 #include <asm/kvm_mmu.h> 15 16 static bool __hyp_text __is_be(struct kvm_vcpu *vcpu) 17 { 18 if (vcpu_mode_is_32bit(vcpu)) 19 return !!(read_sysreg_el2(SYS_SPSR) & PSR_AA32_E_BIT); 20 21 return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE); 22 } 23 24 /* 25 * __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the 26 * guest. 27 * 28 * @vcpu: the offending vcpu 29 * 30 * Returns: 31 * 1: GICV access successfully performed 32 * 0: Not a GICV access 33 * -1: Illegal GICV access successfully performed 34 */ 35 int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu) 36 { 37 struct kvm *kvm = kern_hyp_va(vcpu->kvm); 38 struct vgic_dist *vgic = &kvm->arch.vgic; 39 phys_addr_t fault_ipa; 40 void __iomem *addr; 41 int rd; 42 43 /* Build the full address */ 44 fault_ipa = kvm_vcpu_get_fault_ipa(vcpu); 45 fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0); 46 47 /* If not for GICV, move on */ 48 if (fault_ipa < vgic->vgic_cpu_base || 49 fault_ipa >= (vgic->vgic_cpu_base + KVM_VGIC_V2_CPU_SIZE)) 50 return 0; 51 52 /* Reject anything but a 32bit access */ 53 if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32)) { 54 __kvm_skip_instr(vcpu); 55 return -1; 56 } 57 58 /* Not aligned? Don't bother */ 59 if (fault_ipa & 3) { 60 __kvm_skip_instr(vcpu); 61 return -1; 62 } 63 64 rd = kvm_vcpu_dabt_get_rd(vcpu); 65 addr = hyp_symbol_addr(kvm_vgic_global_state)->vcpu_hyp_va; 66 addr += fault_ipa - vgic->vgic_cpu_base; 67 68 if (kvm_vcpu_dabt_iswrite(vcpu)) { 69 u32 data = vcpu_get_reg(vcpu, rd); 70 if (__is_be(vcpu)) { 71 /* guest pre-swabbed data, undo this for writel() */ 72 data = __kvm_swab32(data); 73 } 74 writel_relaxed(data, addr); 75 } else { 76 u32 data = readl_relaxed(addr); 77 if (__is_be(vcpu)) { 78 /* guest expects swabbed data */ 79 data = __kvm_swab32(data); 80 } 81 vcpu_set_reg(vcpu, rd, data); 82 } 83 84 __kvm_skip_instr(vcpu); 85 86 return 1; 87 } 88