1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (C) 2018 Alexandru Elisei <alexandru.elisei@gmail.com>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #include <sys/types.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/lock.h>
33
34 #include <machine/armreg.h>
35 #include <machine/cpu.h>
36 #include <machine/hypervisor.h>
37
38 #include "arm64.h"
39 #include "reset.h"
40
41 /*
42 * Make the architecturally UNKNOWN value 0. As a bonus, we don't have to
43 * manually set all those RES0 fields.
44 */
45 #define ARCH_UNKNOWN 0
46 #define set_arch_unknown(reg) (memset(&(reg), ARCH_UNKNOWN, sizeof(reg)))
47
48 void
reset_vm_el01_regs(void * vcpu)49 reset_vm_el01_regs(void *vcpu)
50 {
51 struct hypctx *el2ctx;
52
53 el2ctx = vcpu;
54
55 set_arch_unknown(el2ctx->tf);
56
57 set_arch_unknown(el2ctx->actlr_el1);
58 set_arch_unknown(el2ctx->afsr0_el1);
59 set_arch_unknown(el2ctx->afsr1_el1);
60 set_arch_unknown(el2ctx->amair_el1);
61 set_arch_unknown(el2ctx->contextidr_el1);
62 set_arch_unknown(el2ctx->cpacr_el1);
63 set_arch_unknown(el2ctx->csselr_el1);
64 set_arch_unknown(el2ctx->elr_el1);
65 set_arch_unknown(el2ctx->esr_el1);
66 set_arch_unknown(el2ctx->far_el1);
67 set_arch_unknown(el2ctx->mair_el1);
68 set_arch_unknown(el2ctx->mdccint_el1);
69 set_arch_unknown(el2ctx->mdscr_el1);
70 set_arch_unknown(el2ctx->par_el1);
71
72 /*
73 * Guest starts with:
74 * ~SCTLR_M: MMU off
75 * ~SCTLR_C: data cache off
76 * SCTLR_CP15BEN: memory barrier instruction enable from EL0; RAO/WI
77 * ~SCTLR_I: instruction cache off
78 */
79 el2ctx->sctlr_el1 = SCTLR_RES1;
80 el2ctx->sctlr_el1 &= ~SCTLR_M & ~SCTLR_C & ~SCTLR_I;
81 el2ctx->sctlr_el1 |= SCTLR_CP15BEN;
82
83 set_arch_unknown(el2ctx->sp_el0);
84 set_arch_unknown(el2ctx->tcr_el1);
85 set_arch_unknown(el2ctx->tpidr_el0);
86 set_arch_unknown(el2ctx->tpidr_el1);
87 set_arch_unknown(el2ctx->tpidrro_el0);
88 set_arch_unknown(el2ctx->ttbr0_el1);
89 set_arch_unknown(el2ctx->ttbr1_el1);
90 set_arch_unknown(el2ctx->vbar_el1);
91 set_arch_unknown(el2ctx->spsr_el1);
92
93 set_arch_unknown(el2ctx->dbgbcr_el1);
94 set_arch_unknown(el2ctx->dbgbvr_el1);
95 set_arch_unknown(el2ctx->dbgwcr_el1);
96 set_arch_unknown(el2ctx->dbgwvr_el1);
97
98 el2ctx->pmcr_el0 = READ_SPECIALREG(pmcr_el0) & PMCR_N_MASK;
99 /* PMCR_LC is unknown when AArch32 is supported or RES1 otherwise */
100 el2ctx->pmcr_el0 |= PMCR_LC;
101 set_arch_unknown(el2ctx->pmccntr_el0);
102 set_arch_unknown(el2ctx->pmccfiltr_el0);
103 set_arch_unknown(el2ctx->pmcntenset_el0);
104 set_arch_unknown(el2ctx->pmintenset_el1);
105 set_arch_unknown(el2ctx->pmovsset_el0);
106 set_arch_unknown(el2ctx->pmuserenr_el0);
107 memset(el2ctx->pmevcntr_el0, 0, sizeof(el2ctx->pmevcntr_el0));
108 memset(el2ctx->pmevtyper_el0, 0, sizeof(el2ctx->pmevtyper_el0));
109 }
110
111 void
reset_vm_el2_regs(void * vcpu)112 reset_vm_el2_regs(void *vcpu)
113 {
114 struct hypctx *el2ctx;
115 uint64_t cpu_aff, vcpuid;
116
117 el2ctx = vcpu;
118 vcpuid = vcpu_vcpuid(el2ctx->vcpu);
119
120 /*
121 * Set the Hypervisor Configuration Register:
122 *
123 * HCR_RW: use AArch64 for EL1
124 * HCR_TID3: handle ID registers in the vmm to privide a common
125 * set of featers on all vcpus
126 * HCR_TWI: Trap WFI to the hypervisor
127 * HCR_BSU_IS: barrier instructions apply to the inner shareable
128 * domain
129 * HCR_FB: broadcast maintenance operations
130 * HCR_AMO: route physical SError interrupts to EL2
131 * HCR_IMO: route physical IRQ interrupts to EL2
132 * HCR_FMO: route physical FIQ interrupts to EL2
133 * HCR_SWIO: turn set/way invalidate into set/way clean and
134 * invalidate
135 * HCR_VM: use stage 2 translation
136 */
137 el2ctx->hcr_el2 = HCR_RW | HCR_TID3 | HCR_TWI | HCR_BSU_IS | HCR_FB |
138 HCR_AMO | HCR_IMO | HCR_FMO | HCR_SWIO | HCR_VM;
139
140 /* TODO: Trap all extensions we don't support */
141 el2ctx->mdcr_el2 = 0;
142 /* PMCR_EL0.N is read from MDCR_EL2.HPMN */
143 el2ctx->mdcr_el2 |= (el2ctx->pmcr_el0 & PMCR_N_MASK) >> PMCR_N_SHIFT;
144
145 el2ctx->vmpidr_el2 = VMPIDR_EL2_RES1;
146 /* The guest will detect a multi-core, single-threaded CPU */
147 el2ctx->vmpidr_el2 &= ~VMPIDR_EL2_U & ~VMPIDR_EL2_MT;
148 /*
149 * Generate the guest MPIDR value. We only support 16 CPUs at affinity
150 * level 0 to simplify the vgicv3 driver (see writing sgi1r_el1).
151 */
152 cpu_aff = (vcpuid & 0xf) << MPIDR_AFF0_SHIFT |
153 ((vcpuid >> 4) & 0xff) << MPIDR_AFF1_SHIFT |
154 ((vcpuid >> 12) & 0xff) << MPIDR_AFF2_SHIFT |
155 ((vcpuid >> 20) & 0xff) << MPIDR_AFF3_SHIFT;
156 el2ctx->vmpidr_el2 |= cpu_aff;
157
158 /* Use the same CPU identification information as the host */
159 el2ctx->vpidr_el2 = CPU_IMPL_TO_MIDR(CPU_IMPL_ARM);
160 el2ctx->vpidr_el2 |= CPU_VAR_TO_MIDR(0);
161 el2ctx->vpidr_el2 |= CPU_ARCH_TO_MIDR(0xf);
162 el2ctx->vpidr_el2 |= CPU_PART_TO_MIDR(CPU_PART_FOUNDATION);
163 el2ctx->vpidr_el2 |= CPU_REV_TO_MIDR(0);
164
165 /*
166 * Don't trap accesses to CPACR_EL1, trace, SVE, Advanced SIMD
167 * and floating point functionality to EL2.
168 */
169 el2ctx->cptr_el2 = CPTR_RES1;
170 /*
171 * Disable interrupts in the guest. The guest OS will re-enable
172 * them.
173 */
174 el2ctx->tf.tf_spsr = PSR_D | PSR_A | PSR_I | PSR_F;
175 /* Use the EL1 stack when taking exceptions to EL1 */
176 el2ctx->tf.tf_spsr |= PSR_M_EL1h;
177 }
178