summaryrefslogtreecommitdiffstats
path: root/arch/arm64/kvm/vgic-sys-reg-v3.c
blob: 116786d2e8e8fdbe7c2dfc4056b87918e4bf25bf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
/*
 * VGIC system registers handling functions for AArch64 mode
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/irqchip/arm-gic-v3.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <asm/kvm_emulate.h>
#include "vgic.h"
#include "sys_regs.h"

static bool access_gic_ctlr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			    const struct sys_reg_desc *r)
{
	u32 host_pri_bits, host_id_bits, host_seis, host_a3v, seis, a3v;
	struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
	struct vgic_vmcr vmcr;
	u64 val;

	vgic_get_vmcr(vcpu, &vmcr);
	if (p->is_write) {
		val = p->regval;

		/*
		 * Disallow restoring VM state if not supported by this
		 * hardware.
		 */
		host_pri_bits = ((val & ICC_CTLR_EL1_PRI_BITS_MASK) >>
				 ICC_CTLR_EL1_PRI_BITS_SHIFT) + 1;
		if (host_pri_bits > vgic_v3_cpu->num_pri_bits)
			return false;

		vgic_v3_cpu->num_pri_bits = host_pri_bits;

		host_id_bits = (val & ICC_CTLR_EL1_ID_BITS_MASK) >>
				ICC_CTLR_EL1_ID_BITS_SHIFT;
		if (host_id_bits > vgic_v3_cpu->num_id_bits)
			return false;

		vgic_v3_cpu->num_id_bits = host_id_bits;

		host_seis = ((kvm_vgic_global_state.ich_vtr_el2 &
			     ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT);
		seis = (val & ICC_CTLR_EL1_SEIS_MASK) >>
			ICC_CTLR_EL1_SEIS_SHIFT;
		if (host_seis != seis)
			return false;

		host_a3v = ((kvm_vgic_global_state.ich_vtr_el2 &
			    ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT);
		a3v = (val & ICC_CTLR_EL1_A3V_MASK) >> ICC_CTLR_EL1_A3V_SHIFT;
		if (host_a3v != a3v)
			return false;

		/*
		 * Here set VMCR.CTLR in ICC_CTLR_EL1 layout.
		 * The vgic_set_vmcr() will convert to ICH_VMCR layout.
		 */
		vmcr.cbpr = (val & ICC_CTLR_EL1_CBPR_MASK) >> ICC_CTLR_EL1_CBPR_SHIFT;
		vmcr.eoim = (val & ICC_CTLR_EL1_EOImode_MASK) >> ICC_CTLR_EL1_EOImode_SHIFT;
		vgic_set_vmcr(vcpu, &vmcr);
	} else {
		val = 0;
		val |= (vgic_v3_cpu->num_pri_bits - 1) <<
			ICC_CTLR_EL1_PRI_BITS_SHIFT;
		val |= vgic_v3_cpu->num_id_bits << ICC_CTLR_EL1_ID_BITS_SHIFT;
		val |= ((kvm_vgic_global_state.ich_vtr_el2 &
			ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT) <<
			ICC_CTLR_EL1_SEIS_SHIFT;
		val |= ((kvm_vgic_global_state.ich_vtr_el2 &
			ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT) <<
			ICC_CTLR_EL1_A3V_SHIFT;
		/*
		 * The VMCR.CTLR value is in ICC_CTLR_EL1 layout.
		 * Extract it directly using ICC_CTLR_EL1 reg definitions.
		 */
		val |= (vmcr.cbpr << ICC_CTLR_EL1_CBPR_SHIFT) & ICC_CTLR_EL1_CBPR_MASK;
		val |= (vmcr.eoim << ICC_CTLR_EL1_EOImode_SHIFT) & ICC_CTLR_EL1_EOImode_MASK;

		p->regval = val;
	}

	return true;
}

static bool access_gic_pmr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			   const struct sys_reg_desc *r)
{
	struct vgic_vmcr vmcr;

	vgic_get_vmcr(vcpu, &vmcr);
	if (p->is_write) {
		vmcr.pmr = (p->regval & ICC_PMR_EL1_MASK) >> ICC_PMR_EL1_SHIFT;
		vgic_set_vmcr(vcpu, &vmcr);
	} else {
		p->regval = (vmcr.pmr << ICC_PMR_EL1_SHIFT) & ICC_PMR_EL1_MASK;
	}

	return true;
}

static bool access_gic_bpr0(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			    const struct sys_reg_desc *r)
{
	struct vgic_vmcr vmcr;

	vgic_get_vmcr(vcpu, &vmcr);
	if (p->is_write) {
		vmcr.bpr = (p->regval & ICC_BPR0_EL1_MASK) >>
			    ICC_BPR0_EL1_SHIFT;
		vgic_set_vmcr(vcpu, &vmcr);
	} else {
		p->regval = (vmcr.bpr << ICC_BPR0_EL1_SHIFT) &
			     ICC_BPR0_EL1_MASK;
	}

	return true;
}

static bool access_gic_bpr1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			    const struct sys_reg_desc *r)
{
	struct vgic_vmcr vmcr;

	if (!p->is_write)
		p->regval = 0;

	vgic_get_vmcr(vcpu, &vmcr);
	if (!vmcr.cbpr) {
		if (p->is_write) {
			vmcr.abpr = (p->regval & ICC_BPR1_EL1_MASK) >>
				     ICC_BPR1_EL1_SHIFT;
			vgic_set_vmcr(vcpu, &vmcr);
		} else {
			p->regval = (vmcr.abpr << ICC_BPR1_EL1_SHIFT) &
				     ICC_BPR1_EL1_MASK;
		}
	} else {
		if (!p->is_write)
			p->regval = min((vmcr.bpr + 1), 7U);
	}

	return true;
}

static bool access_gic_grpen0(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			      const struct sys_reg_desc *r)
{
	struct vgic_vmcr vmcr;

	vgic_get_vmcr(vcpu, &vmcr);
	if (p->is_write) {
		vmcr.grpen0 = (p->regval & ICC_IGRPEN0_EL1_MASK) >>
			       ICC_IGRPEN0_EL1_SHIFT;
		vgic_set_vmcr(vcpu, &vmcr);
	} else {
		p->regval = (vmcr.grpen0 << ICC_IGRPEN0_EL1_SHIFT) &
			     ICC_IGRPEN0_EL1_MASK;
	}

	return true;
}

static bool access_gic_grpen1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			      const struct sys_reg_desc *r)
{
	struct vgic_vmcr vmcr;

	vgic_get_vmcr(vcpu, &vmcr);
	if (p->is_write) {
		vmcr.grpen1 = (p->regval & ICC_IGRPEN1_EL1_MASK) >>
			       ICC_IGRPEN1_EL1_SHIFT;
		vgic_set_vmcr(vcpu, &vmcr);
	} else {
		p->regval = (vmcr.grpen1 << ICC_IGRPEN1_EL1_SHIFT) &
			     ICC_IGRPEN1_EL1_MASK;
	}

	return true;
}

static void vgic_v3_access_apr_reg(struct kvm_vcpu *vcpu,
				   struct sys_reg_params *p, u8 apr, u8 idx)
{
	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
	uint32_t *ap_reg;

	if (apr)
		ap_reg = &vgicv3->vgic_ap1r[idx];
	else
		ap_reg = &vgicv3->vgic_ap0r[idx];

	if (p->is_write)
		*ap_reg = p->regval;
	else
		p->regval = *ap_reg;
}

static bool access_gic_aprn(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			    const struct sys_reg_desc *r, u8 apr)
{
	struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
	u8 idx = r->Op2 & 3;

	/*
	 * num_pri_bits are initialized with HW supported values.
	 * We can rely safely on num_pri_bits even if VM has not
	 * restored ICC_CTLR_EL1 before restoring APnR registers.
	 */
	switch (vgic_v3_cpu->num_pri_bits) {
	case 7:
		vgic_v3_access_apr_reg(vcpu, p, apr, idx);
		break;
	case 6:
		if (idx > 1)
			goto err;
		vgic_v3_access_apr_reg(vcpu, p, apr, idx);
		break;
	default:
		if (idx > 0)
			goto err;
		vgic_v3_access_apr_reg(vcpu, p, apr, idx);
	}

	return true;
err:
	if (!p->is_write)
		p->regval = 0;

	return false;
}

static bool access_gic_ap0r(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			    const struct sys_reg_desc *r)

{
	return access_gic_aprn(vcpu, p, r, 0);
}

static bool access_gic_ap1r(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			    const struct sys_reg_desc *r)
{
	return access_gic_aprn(vcpu, p, r, 1);
}

static bool access_gic_sre(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
			   const struct sys_reg_desc *r)
{
	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;

	/* Validate SRE bit */
	if (p->is_write) {
		if (!(p->regval & ICC_SRE_EL1_SRE))
			return false;
	} else {
		p->regval = vgicv3->vgic_sre;
	}

	return true;
}
static const struct sys_reg_desc gic_v3_icc_reg_descs[] = {
	{ SYS_DESC(SYS_ICC_PMR_EL1), access_gic_pmr },
	{ SYS_DESC(SYS_ICC_BPR0_EL1), access_gic_bpr0 },
	{ SYS_DESC(SYS_ICC_AP0R0_EL1), access_gic_ap0r },
	{ SYS_DESC(SYS_ICC_AP0R1_EL1), access_gic_ap0r },
	{ SYS_DESC(SYS_ICC_AP0R2_EL1), access_gic_ap0r },
	{ SYS_DESC(SYS_ICC_AP0R3_EL1), access_gic_ap0r },
	{ SYS_DESC(SYS_ICC_AP1R0_EL1), access_gic_ap1r },
	{ SYS_DESC(SYS_ICC_AP1R1_EL1), access_gic_ap1r },
	{ SYS_DESC(SYS_ICC_AP1R2_EL1), access_gic_ap1r },
	{ SYS_DESC(SYS_ICC_AP1R3_EL1), access_gic_ap1r },
	{ SYS_DESC(SYS_ICC_BPR1_EL1), access_gic_bpr1 },
	{ SYS_DESC(SYS_ICC_CTLR_EL1), access_gic_ctlr },
	{ SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre },
	{ SYS_DESC(SYS_ICC_IGRPEN0_EL1), access_gic_grpen0 },
	{ SYS_DESC(SYS_ICC_IGRPEN1_EL1), access_gic_grpen1 },
};

int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
				u64 *reg)
{
	struct sys_reg_params params;
	u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;

	params.regval = *reg;
	params.is_write = is_write;
	params.is_aarch32 = false;
	params.is_32bit = false;

	if (find_reg_by_id(sysreg, &params, gic_v3_icc_reg_descs,
			      ARRAY_SIZE(gic_v3_icc_reg_descs)))
		return 0;

	return -ENXIO;
}

int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write, u64 id,
				u64 *reg)
{
	struct sys_reg_params params;
	const struct sys_reg_desc *r;
	u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;

	if (is_write)
		params.regval = *reg;
	params.is_write = is_write;
	params.is_aarch32 = false;
	params.is_32bit = false;

	r = find_reg_by_id(sysreg, &params, gic_v3_icc_reg_descs,
			   ARRAY_SIZE(gic_v3_icc_reg_descs));
	if (!r)
		return -ENXIO;

	if (!r->access(vcpu, &params, r))
		return -EINVAL;

	if (!is_write)
		*reg = params.regval;

	return 0;
}