xref: /openbmc/linux/arch/arm64/kvm/vgic-sys-reg-v3.c (revision 50f5bd57)
1 /*
2  * VGIC system registers handling functions for AArch64 mode
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  */
13 
14 #include <linux/irqchip/arm-gic-v3.h>
15 #include <linux/kvm.h>
16 #include <linux/kvm_host.h>
17 #include <asm/kvm_emulate.h>
18 #include "vgic.h"
19 #include "sys_regs.h"
20 
21 static bool access_gic_ctlr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
22 			    const struct sys_reg_desc *r)
23 {
24 	u32 host_pri_bits, host_id_bits, host_seis, host_a3v, seis, a3v;
25 	struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
26 	struct vgic_vmcr vmcr;
27 	u64 val;
28 
29 	vgic_get_vmcr(vcpu, &vmcr);
30 	if (p->is_write) {
31 		val = p->regval;
32 
33 		/*
34 		 * Disallow restoring VM state if not supported by this
35 		 * hardware.
36 		 */
37 		host_pri_bits = ((val & ICC_CTLR_EL1_PRI_BITS_MASK) >>
38 				 ICC_CTLR_EL1_PRI_BITS_SHIFT) + 1;
39 		if (host_pri_bits > vgic_v3_cpu->num_pri_bits)
40 			return false;
41 
42 		vgic_v3_cpu->num_pri_bits = host_pri_bits;
43 
44 		host_id_bits = (val & ICC_CTLR_EL1_ID_BITS_MASK) >>
45 				ICC_CTLR_EL1_ID_BITS_SHIFT;
46 		if (host_id_bits > vgic_v3_cpu->num_id_bits)
47 			return false;
48 
49 		vgic_v3_cpu->num_id_bits = host_id_bits;
50 
51 		host_seis = ((kvm_vgic_global_state.ich_vtr_el2 &
52 			     ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT);
53 		seis = (val & ICC_CTLR_EL1_SEIS_MASK) >>
54 			ICC_CTLR_EL1_SEIS_SHIFT;
55 		if (host_seis != seis)
56 			return false;
57 
58 		host_a3v = ((kvm_vgic_global_state.ich_vtr_el2 &
59 			    ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT);
60 		a3v = (val & ICC_CTLR_EL1_A3V_MASK) >> ICC_CTLR_EL1_A3V_SHIFT;
61 		if (host_a3v != a3v)
62 			return false;
63 
64 		/*
65 		 * Here set VMCR.CTLR in ICC_CTLR_EL1 layout.
66 		 * The vgic_set_vmcr() will convert to ICH_VMCR layout.
67 		 */
68 		vmcr.cbpr = (val & ICC_CTLR_EL1_CBPR_MASK) >> ICC_CTLR_EL1_CBPR_SHIFT;
69 		vmcr.eoim = (val & ICC_CTLR_EL1_EOImode_MASK) >> ICC_CTLR_EL1_EOImode_SHIFT;
70 		vgic_set_vmcr(vcpu, &vmcr);
71 	} else {
72 		val = 0;
73 		val |= (vgic_v3_cpu->num_pri_bits - 1) <<
74 			ICC_CTLR_EL1_PRI_BITS_SHIFT;
75 		val |= vgic_v3_cpu->num_id_bits << ICC_CTLR_EL1_ID_BITS_SHIFT;
76 		val |= ((kvm_vgic_global_state.ich_vtr_el2 &
77 			ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT) <<
78 			ICC_CTLR_EL1_SEIS_SHIFT;
79 		val |= ((kvm_vgic_global_state.ich_vtr_el2 &
80 			ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT) <<
81 			ICC_CTLR_EL1_A3V_SHIFT;
82 		/*
83 		 * The VMCR.CTLR value is in ICC_CTLR_EL1 layout.
84 		 * Extract it directly using ICC_CTLR_EL1 reg definitions.
85 		 */
86 		val |= (vmcr.cbpr << ICC_CTLR_EL1_CBPR_SHIFT) & ICC_CTLR_EL1_CBPR_MASK;
87 		val |= (vmcr.eoim << ICC_CTLR_EL1_EOImode_SHIFT) & ICC_CTLR_EL1_EOImode_MASK;
88 
89 		p->regval = val;
90 	}
91 
92 	return true;
93 }
94 
95 static bool access_gic_pmr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
96 			   const struct sys_reg_desc *r)
97 {
98 	struct vgic_vmcr vmcr;
99 
100 	vgic_get_vmcr(vcpu, &vmcr);
101 	if (p->is_write) {
102 		vmcr.pmr = (p->regval & ICC_PMR_EL1_MASK) >> ICC_PMR_EL1_SHIFT;
103 		vgic_set_vmcr(vcpu, &vmcr);
104 	} else {
105 		p->regval = (vmcr.pmr << ICC_PMR_EL1_SHIFT) & ICC_PMR_EL1_MASK;
106 	}
107 
108 	return true;
109 }
110 
111 static bool access_gic_bpr0(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
112 			    const struct sys_reg_desc *r)
113 {
114 	struct vgic_vmcr vmcr;
115 
116 	vgic_get_vmcr(vcpu, &vmcr);
117 	if (p->is_write) {
118 		vmcr.bpr = (p->regval & ICC_BPR0_EL1_MASK) >>
119 			    ICC_BPR0_EL1_SHIFT;
120 		vgic_set_vmcr(vcpu, &vmcr);
121 	} else {
122 		p->regval = (vmcr.bpr << ICC_BPR0_EL1_SHIFT) &
123 			     ICC_BPR0_EL1_MASK;
124 	}
125 
126 	return true;
127 }
128 
129 static bool access_gic_bpr1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
130 			    const struct sys_reg_desc *r)
131 {
132 	struct vgic_vmcr vmcr;
133 
134 	if (!p->is_write)
135 		p->regval = 0;
136 
137 	vgic_get_vmcr(vcpu, &vmcr);
138 	if (!vmcr.cbpr) {
139 		if (p->is_write) {
140 			vmcr.abpr = (p->regval & ICC_BPR1_EL1_MASK) >>
141 				     ICC_BPR1_EL1_SHIFT;
142 			vgic_set_vmcr(vcpu, &vmcr);
143 		} else {
144 			p->regval = (vmcr.abpr << ICC_BPR1_EL1_SHIFT) &
145 				     ICC_BPR1_EL1_MASK;
146 		}
147 	} else {
148 		if (!p->is_write)
149 			p->regval = min((vmcr.bpr + 1), 7U);
150 	}
151 
152 	return true;
153 }
154 
155 static bool access_gic_grpen0(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
156 			      const struct sys_reg_desc *r)
157 {
158 	struct vgic_vmcr vmcr;
159 
160 	vgic_get_vmcr(vcpu, &vmcr);
161 	if (p->is_write) {
162 		vmcr.grpen0 = (p->regval & ICC_IGRPEN0_EL1_MASK) >>
163 			       ICC_IGRPEN0_EL1_SHIFT;
164 		vgic_set_vmcr(vcpu, &vmcr);
165 	} else {
166 		p->regval = (vmcr.grpen0 << ICC_IGRPEN0_EL1_SHIFT) &
167 			     ICC_IGRPEN0_EL1_MASK;
168 	}
169 
170 	return true;
171 }
172 
173 static bool access_gic_grpen1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
174 			      const struct sys_reg_desc *r)
175 {
176 	struct vgic_vmcr vmcr;
177 
178 	vgic_get_vmcr(vcpu, &vmcr);
179 	if (p->is_write) {
180 		vmcr.grpen1 = (p->regval & ICC_IGRPEN1_EL1_MASK) >>
181 			       ICC_IGRPEN1_EL1_SHIFT;
182 		vgic_set_vmcr(vcpu, &vmcr);
183 	} else {
184 		p->regval = (vmcr.grpen1 << ICC_IGRPEN1_EL1_SHIFT) &
185 			     ICC_IGRPEN1_EL1_MASK;
186 	}
187 
188 	return true;
189 }
190 
191 static void vgic_v3_access_apr_reg(struct kvm_vcpu *vcpu,
192 				   struct sys_reg_params *p, u8 apr, u8 idx)
193 {
194 	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
195 	uint32_t *ap_reg;
196 
197 	if (apr)
198 		ap_reg = &vgicv3->vgic_ap1r[idx];
199 	else
200 		ap_reg = &vgicv3->vgic_ap0r[idx];
201 
202 	if (p->is_write)
203 		*ap_reg = p->regval;
204 	else
205 		p->regval = *ap_reg;
206 }
207 
208 static bool access_gic_aprn(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
209 			    const struct sys_reg_desc *r, u8 apr)
210 {
211 	u8 idx = r->Op2 & 3;
212 
213 	if (idx > vgic_v3_max_apr_idx(vcpu))
214 		goto err;
215 
216 	vgic_v3_access_apr_reg(vcpu, p, apr, idx);
217 	return true;
218 err:
219 	if (!p->is_write)
220 		p->regval = 0;
221 
222 	return false;
223 }
224 
225 static bool access_gic_ap0r(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
226 			    const struct sys_reg_desc *r)
227 
228 {
229 	return access_gic_aprn(vcpu, p, r, 0);
230 }
231 
232 static bool access_gic_ap1r(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
233 			    const struct sys_reg_desc *r)
234 {
235 	return access_gic_aprn(vcpu, p, r, 1);
236 }
237 
238 static bool access_gic_sre(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
239 			   const struct sys_reg_desc *r)
240 {
241 	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
242 
243 	/* Validate SRE bit */
244 	if (p->is_write) {
245 		if (!(p->regval & ICC_SRE_EL1_SRE))
246 			return false;
247 	} else {
248 		p->regval = vgicv3->vgic_sre;
249 	}
250 
251 	return true;
252 }
253 static const struct sys_reg_desc gic_v3_icc_reg_descs[] = {
254 	{ SYS_DESC(SYS_ICC_PMR_EL1), access_gic_pmr },
255 	{ SYS_DESC(SYS_ICC_BPR0_EL1), access_gic_bpr0 },
256 	{ SYS_DESC(SYS_ICC_AP0R0_EL1), access_gic_ap0r },
257 	{ SYS_DESC(SYS_ICC_AP0R1_EL1), access_gic_ap0r },
258 	{ SYS_DESC(SYS_ICC_AP0R2_EL1), access_gic_ap0r },
259 	{ SYS_DESC(SYS_ICC_AP0R3_EL1), access_gic_ap0r },
260 	{ SYS_DESC(SYS_ICC_AP1R0_EL1), access_gic_ap1r },
261 	{ SYS_DESC(SYS_ICC_AP1R1_EL1), access_gic_ap1r },
262 	{ SYS_DESC(SYS_ICC_AP1R2_EL1), access_gic_ap1r },
263 	{ SYS_DESC(SYS_ICC_AP1R3_EL1), access_gic_ap1r },
264 	{ SYS_DESC(SYS_ICC_BPR1_EL1), access_gic_bpr1 },
265 	{ SYS_DESC(SYS_ICC_CTLR_EL1), access_gic_ctlr },
266 	{ SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre },
267 	{ SYS_DESC(SYS_ICC_IGRPEN0_EL1), access_gic_grpen0 },
268 	{ SYS_DESC(SYS_ICC_IGRPEN1_EL1), access_gic_grpen1 },
269 };
270 
271 int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
272 				u64 *reg)
273 {
274 	struct sys_reg_params params;
275 	u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;
276 
277 	params.regval = *reg;
278 	params.is_write = is_write;
279 	params.is_aarch32 = false;
280 	params.is_32bit = false;
281 
282 	if (find_reg_by_id(sysreg, &params, gic_v3_icc_reg_descs,
283 			      ARRAY_SIZE(gic_v3_icc_reg_descs)))
284 		return 0;
285 
286 	return -ENXIO;
287 }
288 
289 int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write, u64 id,
290 				u64 *reg)
291 {
292 	struct sys_reg_params params;
293 	const struct sys_reg_desc *r;
294 	u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;
295 
296 	if (is_write)
297 		params.regval = *reg;
298 	params.is_write = is_write;
299 	params.is_aarch32 = false;
300 	params.is_32bit = false;
301 
302 	r = find_reg_by_id(sysreg, &params, gic_v3_icc_reg_descs,
303 			   ARRAY_SIZE(gic_v3_icc_reg_descs));
304 	if (!r)
305 		return -ENXIO;
306 
307 	if (!r->access(vcpu, &params, r))
308 		return -EINVAL;
309 
310 	if (!is_write)
311 		*reg = params.regval;
312 
313 	return 0;
314 }
315