1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
4 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
6 #include <linux/compiler.h>
7 #include <linux/errno.h>
8 #include <linux/sched.h>
9 #include <linux/kvm_host.h>
10 #include <linux/kvm.h>
12 #include <asm/unified.h>
13 #include <asm/ptrace.h>
14 #include <asm/cputype.h>
15 #include <asm/kvm_arm.h>
16 #include <asm/kvm_coproc.h>
17 #include <asm/kvm_emulate.h>
19 #include <kvm/arm_arch_timer.h>
21 /******************************************************************************
22 * Cortex-A15 and Cortex-A7 Reset Values
25 static struct kvm_regs cortexa_regs_reset
= {
26 .usr_regs
.ARM_cpsr
= SVC_MODE
| PSR_A_BIT
| PSR_I_BIT
| PSR_F_BIT
,
30 /*******************************************************************************
31 * Exported reset function
35 * kvm_reset_vcpu - sets core registers and cp15 registers to reset value
36 * @vcpu: The VCPU pointer
38 * This function finds the right table above and sets the registers on the
39 * virtual CPU struct to their architecturally defined reset values.
41 int kvm_reset_vcpu(struct kvm_vcpu
*vcpu
)
43 struct kvm_regs
*reset_regs
;
45 switch (vcpu
->arch
.target
) {
46 case KVM_ARM_TARGET_CORTEX_A7
:
47 case KVM_ARM_TARGET_CORTEX_A15
:
48 reset_regs
= &cortexa_regs_reset
;
49 vcpu
->arch
.midr
= read_cpuid_id();
55 /* Reset core registers */
56 memcpy(&vcpu
->arch
.ctxt
.gp_regs
, reset_regs
, sizeof(vcpu
->arch
.ctxt
.gp_regs
));
58 /* Reset CP15 registers */
59 kvm_reset_coprocs(vcpu
);
62 * Additional reset state handling that PSCI may have imposed on us.
63 * Must be done after all the sys_reg reset.
65 if (READ_ONCE(vcpu
->arch
.reset_state
.reset
)) {
66 unsigned long target_pc
= vcpu
->arch
.reset_state
.pc
;
68 /* Gracefully handle Thumb2 entry point */
74 /* Propagate caller endianness */
75 if (vcpu
->arch
.reset_state
.be
)
76 kvm_vcpu_set_be(vcpu
);
78 *vcpu_pc(vcpu
) = target_pc
;
79 vcpu_set_reg(vcpu
, 0, vcpu
->arch
.reset_state
.r0
);
81 vcpu
->arch
.reset_state
.reset
= false;
84 /* Reset arch_timer context */
85 return kvm_timer_vcpu_reset(vcpu
);