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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | /* * Copyright (C) 2012,2013 - ARM Ltd * Author: Marc Zyngier <marc.zyngier@arm.com> * * Derived from arch/arm/kvm/reset.c * Copyright (C) 2012 - Virtual Open Systems and Columbia University * Author: Christoffer Dall <c.dall@virtualopensystems.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, version 2, as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/errno.h> #include <linux/kvm_host.h> #include <linux/kvm.h> #include <linux/hw_breakpoint.h> #include <kvm/arm_arch_timer.h> #include <asm/cputype.h> #include <asm/ptrace.h> #include <asm/kvm_arm.h> #include <asm/kvm_asm.h> #include <asm/kvm_coproc.h> #include <asm/kvm_mmu.h> /* * ARMv8 Reset Values */ static const struct kvm_regs default_regs_reset = { .regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | PSR_D_BIT), }; static const struct kvm_regs default_regs_reset32 = { .regs.pstate = (COMPAT_PSR_MODE_SVC | COMPAT_PSR_A_BIT | COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT), }; static bool cpu_has_32bit_el1(void) { u64 pfr0; pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); return !!(pfr0 & 0x20); } /** * kvm_arch_dev_ioctl_check_extension * * We currently assume that the number of HW registers is uniform * across all CPUs (see cpuinfo_sanity_check). */ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext) { int r; switch (ext) { case KVM_CAP_ARM_EL1_32BIT: r = cpu_has_32bit_el1(); break; case KVM_CAP_GUEST_DEBUG_HW_BPS: r = get_num_brps(); break; case KVM_CAP_GUEST_DEBUG_HW_WPS: r = get_num_wrps(); break; case KVM_CAP_ARM_PMU_V3: r = kvm_arm_support_pmu_v3(); break; case KVM_CAP_SET_GUEST_DEBUG: case KVM_CAP_VCPU_ATTRIBUTES: r = 1; break; default: r = 0; } return r; } /** * kvm_reset_vcpu - sets core registers and sys_regs to reset value * @vcpu: The VCPU pointer * * This function finds the right table above and sets the registers on * the virtual CPU struct to their architecturally defined reset * values. */ int kvm_reset_vcpu(struct kvm_vcpu *vcpu) { const struct kvm_regs *cpu_reset; switch (vcpu->arch.target) { default: if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) { if (!cpu_has_32bit_el1()) return -EINVAL; cpu_reset = &default_regs_reset32; } else { cpu_reset = &default_regs_reset; } break; } /* Reset core registers */ memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset)); /* Reset system registers */ kvm_reset_sys_regs(vcpu); /* Reset PMU */ kvm_pmu_vcpu_reset(vcpu); /* Reset timer */ return kvm_timer_vcpu_reset(vcpu); } |