2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 * Derived from arch/arm/kvm/reset.c
6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
7 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License, version 2, as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include <linux/errno.h>
23 #include <linux/kvm_host.h>
24 #include <linux/kvm.h>
25 #include <linux/hw_breakpoint.h>
27 #include <kvm/arm_arch_timer.h>
29 #include <asm/cputype.h>
30 #include <asm/ptrace.h>
31 #include <asm/kvm_arm.h>
32 #include <asm/kvm_asm.h>
33 #include <asm/kvm_coproc.h>
34 #include <asm/kvm_mmu.h>
39 static const struct kvm_regs default_regs_reset = {
40 .regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT |
41 PSR_F_BIT | PSR_D_BIT),
44 static const struct kvm_regs default_regs_reset32 = {
45 .regs.pstate = (PSR_AA32_MODE_SVC | PSR_AA32_A_BIT |
46 PSR_AA32_I_BIT | PSR_AA32_F_BIT),
49 static bool cpu_has_32bit_el1(void)
53 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
54 return !!(pfr0 & 0x20);
58 * kvm_arch_dev_ioctl_check_extension
60 * We currently assume that the number of HW registers is uniform
61 * across all CPUs (see cpuinfo_sanity_check).
63 int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
68 case KVM_CAP_ARM_EL1_32BIT:
69 r = cpu_has_32bit_el1();
71 case KVM_CAP_GUEST_DEBUG_HW_BPS:
74 case KVM_CAP_GUEST_DEBUG_HW_WPS:
77 case KVM_CAP_ARM_PMU_V3:
78 r = kvm_arm_support_pmu_v3();
80 case KVM_CAP_ARM_INJECT_SERROR_ESR:
81 r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
83 case KVM_CAP_SET_GUEST_DEBUG:
84 case KVM_CAP_VCPU_ATTRIBUTES:
85 case KVM_CAP_VCPU_EVENTS:
96 * kvm_reset_vcpu - sets core registers and sys_regs to reset value
97 * @vcpu: The VCPU pointer
99 * This function finds the right table above and sets the registers on
100 * the virtual CPU struct to their architecturally defined reset
103 int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
105 const struct kvm_regs *cpu_reset;
107 switch (vcpu->arch.target) {
109 if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) {
110 if (!cpu_has_32bit_el1())
112 cpu_reset = &default_regs_reset32;
114 cpu_reset = &default_regs_reset;
120 /* Reset core registers */
121 memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset));
123 /* Reset system registers */
124 kvm_reset_sys_regs(vcpu);
127 kvm_pmu_vcpu_reset(vcpu);
129 /* Default workaround setup is enabled (if supported) */
130 if (kvm_arm_have_ssbd() == KVM_SSBD_KERNEL)
131 vcpu->arch.workaround_flags |= VCPU_WORKAROUND_2_FLAG;
134 return kvm_timer_vcpu_reset(vcpu);