2 * Copyright (C) 2012-2015 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #include <linux/compiler.h>
19 #include <linux/irqchip/arm-gic.h>
20 #include <linux/kvm_host.h>
21 #include <linux/swab.h>
23 #include <asm/kvm_emulate.h>
24 #include <asm/kvm_hyp.h>
25 #include <asm/kvm_mmu.h>
27 static bool __hyp_text __is_be(struct kvm_vcpu *vcpu)
29 if (vcpu_mode_is_32bit(vcpu))
30 return !!(read_sysreg_el2(spsr) & PSR_AA32_E_BIT);
32 return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE);
36 * __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the
39 * @vcpu: the offending vcpu
42 * 1: GICV access successfully performed
43 * 0: Not a GICV access
44 * -1: Illegal GICV access successfully performed
46 int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
48 struct kvm *kvm = kern_hyp_va(vcpu->kvm);
49 struct vgic_dist *vgic = &kvm->arch.vgic;
50 phys_addr_t fault_ipa;
54 /* Build the full address */
55 fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
56 fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0);
58 /* If not for GICV, move on */
59 if (fault_ipa < vgic->vgic_cpu_base ||
60 fault_ipa >= (vgic->vgic_cpu_base + KVM_VGIC_V2_CPU_SIZE))
63 /* Reject anything but a 32bit access */
64 if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32)) {
65 __kvm_skip_instr(vcpu);
69 /* Not aligned? Don't bother */
71 __kvm_skip_instr(vcpu);
75 rd = kvm_vcpu_dabt_get_rd(vcpu);
76 addr = hyp_symbol_addr(kvm_vgic_global_state)->vcpu_hyp_va;
77 addr += fault_ipa - vgic->vgic_cpu_base;
79 if (kvm_vcpu_dabt_iswrite(vcpu)) {
80 u32 data = vcpu_get_reg(vcpu, rd);
82 /* guest pre-swabbed data, undo this for writel() */
85 writel_relaxed(data, addr);
87 u32 data = readl_relaxed(addr);
89 /* guest expects swabbed data */
92 vcpu_set_reg(vcpu, rd, data);
95 __kvm_skip_instr(vcpu);