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
= (COMPAT_PSR_MODE_SVC
| COMPAT_PSR_A_BIT
|
46 COMPAT_PSR_I_BIT
| COMPAT_PSR_F_BIT
),
49 static const struct kvm_irq_level default_vtimer_irq
= {
54 static bool cpu_has_32bit_el1(void)
58 pfr0
= read_system_reg(SYS_ID_AA64PFR0_EL1
);
59 return !!(pfr0
& 0x20);
63 * kvm_arch_dev_ioctl_check_extension
65 * We currently assume that the number of HW registers is uniform
66 * across all CPUs (see cpuinfo_sanity_check).
68 int kvm_arch_dev_ioctl_check_extension(long ext
)
73 case KVM_CAP_ARM_EL1_32BIT
:
74 r
= cpu_has_32bit_el1();
76 case KVM_CAP_GUEST_DEBUG_HW_BPS
:
79 case KVM_CAP_GUEST_DEBUG_HW_WPS
:
82 case KVM_CAP_ARM_PMU_V3
:
83 r
= kvm_arm_support_pmu_v3();
85 case KVM_CAP_SET_GUEST_DEBUG
:
86 case KVM_CAP_VCPU_ATTRIBUTES
:
97 * kvm_reset_vcpu - sets core registers and sys_regs to reset value
98 * @vcpu: The VCPU pointer
100 * This function finds the right table above and sets the registers on
101 * the virtual CPU struct to their architectually defined reset
104 int kvm_reset_vcpu(struct kvm_vcpu
*vcpu
)
106 const struct kvm_irq_level
*cpu_vtimer_irq
;
107 const struct kvm_regs
*cpu_reset
;
109 switch (vcpu
->arch
.target
) {
111 if (test_bit(KVM_ARM_VCPU_EL1_32BIT
, vcpu
->arch
.features
)) {
112 if (!cpu_has_32bit_el1())
114 cpu_reset
= &default_regs_reset32
;
116 cpu_reset
= &default_regs_reset
;
119 cpu_vtimer_irq
= &default_vtimer_irq
;
123 /* Reset core registers */
124 memcpy(vcpu_gp_regs(vcpu
), cpu_reset
, sizeof(*cpu_reset
));
126 /* Reset system registers */
127 kvm_reset_sys_regs(vcpu
);
130 kvm_pmu_vcpu_reset(vcpu
);
133 return kvm_timer_vcpu_reset(vcpu
, cpu_vtimer_irq
);
136 extern char __hyp_idmap_text_start
[];
138 unsigned long kvm_hyp_reset_entry(void)
140 if (!__kvm_cpu_uses_extended_idmap()) {
141 unsigned long offset
;
144 * Find the address of __kvm_hyp_reset() in the trampoline page.
145 * This is present in the running page tables, and the boot page
146 * tables, so we call the code here to start the trampoline
149 offset
= (unsigned long)__kvm_hyp_reset
150 - ((unsigned long)__hyp_idmap_text_start
& PAGE_MASK
);
152 return TRAMPOLINE_VA
+ offset
;
155 * KVM is running with merged page tables, which don't have the
156 * trampoline page mapped. We know the idmap is still mapped,
157 * but can't be called into directly. Use
158 * __extended_idmap_trampoline to do the call.
160 return (unsigned long)kvm_ksym_ref(__extended_idmap_trampoline
);