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89 lines
2.0 KiB
89 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2012-2015 - ARM Ltd |
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* Author: Marc Zyngier <[email protected]> |
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*/ |
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#include <hyp/adjust_pc.h> |
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#include <linux/compiler.h> |
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#include <linux/irqchip/arm-gic.h> |
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#include <linux/kvm_host.h> |
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#include <linux/swab.h> |
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#include <asm/kvm_emulate.h> |
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#include <asm/kvm_hyp.h> |
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#include <asm/kvm_mmu.h> |
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static bool __is_be(struct kvm_vcpu *vcpu) |
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{ |
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if (vcpu_mode_is_32bit(vcpu)) |
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return !!(read_sysreg_el2(SYS_SPSR) & PSR_AA32_E_BIT); |
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return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE); |
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} |
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/* |
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* __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the |
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* guest. |
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* |
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* @vcpu: the offending vcpu |
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* |
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* Returns: |
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* 1: GICV access successfully performed |
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* 0: Not a GICV access |
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* -1: Illegal GICV access successfully performed |
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*/ |
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int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu) |
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{ |
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struct kvm *kvm = kern_hyp_va(vcpu->kvm); |
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struct vgic_dist *vgic = &kvm->arch.vgic; |
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phys_addr_t fault_ipa; |
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void __iomem *addr; |
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int rd; |
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/* Build the full address */ |
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fault_ipa = kvm_vcpu_get_fault_ipa(vcpu); |
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fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0); |
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/* If not for GICV, move on */ |
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if (fault_ipa < vgic->vgic_cpu_base || |
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fault_ipa >= (vgic->vgic_cpu_base + KVM_VGIC_V2_CPU_SIZE)) |
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return 0; |
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/* Reject anything but a 32bit access */ |
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if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32)) { |
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__kvm_skip_instr(vcpu); |
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return -1; |
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} |
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/* Not aligned? Don't bother */ |
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if (fault_ipa & 3) { |
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__kvm_skip_instr(vcpu); |
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return -1; |
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} |
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rd = kvm_vcpu_dabt_get_rd(vcpu); |
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addr = kvm_vgic_global_state.vcpu_hyp_va; |
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addr += fault_ipa - vgic->vgic_cpu_base; |
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if (kvm_vcpu_dabt_iswrite(vcpu)) { |
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u32 data = vcpu_get_reg(vcpu, rd); |
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if (__is_be(vcpu)) { |
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/* guest pre-swabbed data, undo this for writel() */ |
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data = __kvm_swab32(data); |
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} |
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writel_relaxed(data, addr); |
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} else { |
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u32 data = readl_relaxed(addr); |
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if (__is_be(vcpu)) { |
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/* guest expects swabbed data */ |
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data = __kvm_swab32(data); |
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} |
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vcpu_set_reg(vcpu, rd, data); |
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} |
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__kvm_skip_instr(vcpu); |
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return 1; |
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}
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