projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 06282fd2 MZ |
2 | /* |
| 3 | * Copyright (C) 2012-2015 - ARM Ltd | |
| 4 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
| 06282fd2 MZ |
5 | */ |
| 6 | ||
| 7 | #include <linux/compiler.h> | |
| 8 | #include <linux/irqchip/arm-gic.h> | |
| 9 | #include <linux/kvm_host.h> | |
| b220244d | 10 | #include <linux/swab.h> |
| 06282fd2 | 11 | |
| bf8feb39 | 12 | #include <asm/kvm_emulate.h> |
| 13720a56 | 13 | #include <asm/kvm_hyp.h> |
| d6811986 | 14 | #include <asm/kvm_mmu.h> |
| 06282fd2 | 15 | |
| b220244d JM |
16 | static bool __hyp_text __is_be(struct kvm_vcpu *vcpu) |
| 17 | { | |
| 18 | if (vcpu_mode_is_32bit(vcpu)) | |
| 256c0960 | 19 | return !!(read_sysreg_el2(spsr) & PSR_AA32_E_BIT); |
| b220244d JM |
20 | |
| 21 | return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE); | |
| 22 | } | |
| 23 | ||
| 3272f0d0 MZ |
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 | |
| bd7d95ca | 33 | * -1: Illegal GICV access successfully performed |
| 3272f0d0 MZ |
34 | */ |
| 35 | int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu) | |
| fb5ee369 | 36 | { |
| bf8feb39 MZ |
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)) | |
| 3272f0d0 | 50 | return 0; |
| bf8feb39 MZ |
51 | |
| 52 | /* Reject anything but a 32bit access */ | |
| bd7d95ca MR |
53 | if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32)) { |
| 54 | __kvm_skip_instr(vcpu); | |
| 3272f0d0 | 55 | return -1; |
| bd7d95ca | 56 | } |
| bf8feb39 MZ |
57 | |
| 58 | /* Not aligned? Don't bother */ | |
| bd7d95ca MR |
59 | if (fault_ipa & 3) { |
| 60 | __kvm_skip_instr(vcpu); | |
| 3272f0d0 | 61 | return -1; |
| bd7d95ca | 62 | } |
| bf8feb39 MZ |
63 | |
| 64 | rd = kvm_vcpu_dabt_get_rd(vcpu); | |
| 1bb32a44 | 65 | addr = hyp_symbol_addr(kvm_vgic_global_state)->vcpu_hyp_va; |
| bf8feb39 MZ |
66 | addr += fault_ipa - vgic->vgic_cpu_base; |
| 67 | ||
| 68 | if (kvm_vcpu_dabt_iswrite(vcpu)) { | |
| b220244d JM |
69 | u32 data = vcpu_get_reg(vcpu, rd); |
| 70 | if (__is_be(vcpu)) { | |
| 71 | /* guest pre-swabbed data, undo this for writel() */ | |
| 72 | data = swab32(data); | |
| 73 | } | |
| bf8feb39 MZ |
74 | writel_relaxed(data, addr); |
| 75 | } else { | |
| 76 | u32 data = readl_relaxed(addr); | |
| b220244d JM |
77 | if (__is_be(vcpu)) { |
| 78 | /* guest expects swabbed data */ | |
| 79 | data = swab32(data); | |
| 80 | } | |
| 81 | vcpu_set_reg(vcpu, rd, data); | |
| bf8feb39 MZ |
82 | } |
| 83 | ||
| bd7d95ca MR |
84 | __kvm_skip_instr(vcpu); |
| 85 | ||
| 3272f0d0 | 86 | return 1; |
| fb5ee369 | 87 | } |