aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm64/kvm/hyp/sysreg-sr.c
blob: e19d89cabf2a2e09c8a27f0f348f93f5546bd883 (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
/*
 * Copyright (C) 2012-2015 - ARM Ltd
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/compiler.h>
#include <linux/kvm_host.h>

#include <asm/kvm_asm.h>
#include <asm/kvm_hyp.h>

/* Yes, this does nothing, on purpose */
static void __hyp_text __sysreg_do_nothing(struct kvm_cpu_context *ctxt) { }

/*
 * Non-VHE: Both host and guest must save everything.
 *
 * VHE: Host must save tpidr*_el0, actlr_el1, mdscr_el1, sp_el0,
 * and guest must save everything.
 */

static void __hyp_text __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
{
	ctxt->sys_regs[ACTLR_EL1]	= read_sysreg(actlr_el1);
	ctxt->sys_regs[TPIDR_EL0]	= read_sysreg(tpidr_el0);
	ctxt->sys_regs[TPIDRRO_EL0]	= read_sysreg(tpidrro_el0);
	ctxt->sys_regs[MDSCR_EL1]	= read_sysreg(mdscr_el1);
	ctxt->gp_regs.regs.sp		= read_sysreg(sp_el0);
}

static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)
{
	ctxt->sys_regs[MPIDR_EL1]	= read_sysreg(vmpidr_el2);
	ctxt->sys_regs[CSSELR_EL1]	= read_sysreg(csselr_el1);
	ctxt->sys_regs[SCTLR_EL1]	= read_sysreg_el1(sctlr);
	ctxt->sys_regs[CPACR_EL1]	= read_sysreg_el1(cpacr);
	ctxt->sys_regs[TTBR0_EL1]	= read_sysreg_el1(ttbr0);
	ctxt->sys_regs[TTBR1_EL1]	= read_sysreg_el1(ttbr1);
	ctxt->sys_regs[TCR_EL1]		= read_sysreg_el1(tcr);
	ctxt->sys_regs[ESR_EL1]		= read_sysreg_el1(esr);
	ctxt->sys_regs[AFSR0_EL1]	= read_sysreg_el1(afsr0);
	ctxt->sys_regs[AFSR1_EL1]	= read_sysreg_el1(afsr1);
	ctxt->sys_regs[FAR_EL1]		= read_sysreg_el1(far);
	ctxt->sys_regs[MAIR_EL1]	= read_sysreg_el1(mair);
	ctxt->sys_regs[VBAR_EL1]	= read_sysreg_el1(vbar);
	ctxt->sys_regs[CONTEXTIDR_EL1]	= read_sysreg_el1(contextidr);
	ctxt->sys_regs[AMAIR_EL1]	= read_sysreg_el1(amair);
	ctxt->sys_regs[CNTKCTL_EL1]	= read_sysreg_el1(cntkctl);
	ctxt->sys_regs[PAR_EL1]		= read_sysreg(par_el1);
	ctxt->sys_regs[TPIDR_EL1]	= read_sysreg(tpidr_el1);

	ctxt->gp_regs.sp_el1		= read_sysreg(sp_el1);
	ctxt->gp_regs.elr_el1		= read_sysreg_el1(elr);
	ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg_el1(spsr);
	ctxt->gp_regs.regs.pc		= read_sysreg_el2(elr);
	ctxt->gp_regs.regs.pstate	= read_sysreg_el2(spsr);
}

static hyp_alternate_select(__sysreg_call_save_host_state,
			    __sysreg_save_state, __sysreg_do_nothing,
			    ARM64_HAS_VIRT_HOST_EXTN);

void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt)
{
	__sysreg_call_save_host_state()(ctxt);
	__sysreg_save_common_state(ctxt);
}

void __hyp_text __sysreg_save_guest_state(struct kvm_cpu_context *ctxt)
{
	__sysreg_save_state(ctxt);
	__sysreg_save_common_state(ctxt);
}

static void __hyp_text __sysreg_restore_common_state(struct kvm_cpu_context *ctxt)
{
	write_sysreg(ctxt->sys_regs[ACTLR_EL1],	  actlr_el1);
	write_sysreg(ctxt->sys_regs[TPIDR_EL0],	  tpidr_el0);
	write_sysreg(ctxt->sys_regs[TPIDRRO_EL0], tpidrro_el0);
	write_sysreg(ctxt->sys_regs[MDSCR_EL1],	  mdscr_el1);
	write_sysreg(ctxt->gp_regs.regs.sp,	  sp_el0);
}

static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
{
	write_sysreg(ctxt->sys_regs[MPIDR_EL1],		vmpidr_el2);
	write_sysreg(ctxt->sys_regs[CSSELR_EL1],	csselr_el1);
	write_sysreg_el1(ctxt->sys_regs[SCTLR_EL1],	sctlr);
	write_sysreg_el1(ctxt->sys_regs[CPACR_EL1],	cpacr);
	write_sysreg_el1(ctxt->sys_regs[TTBR0_EL1],	ttbr0);
	write_sysreg_el1(ctxt->sys_regs[TTBR1_EL1],	ttbr1);
	write_sysreg_el1(ctxt->sys_regs[TCR_EL1],	tcr);
	write_sysreg_el1(ctxt->sys_regs[ESR_EL1],	esr);
	write_sysreg_el1(ctxt->sys_regs[AFSR0_EL1],	afsr0);
	write_sysreg_el1(ctxt->sys_regs[AFSR1_EL1],	afsr1);
	write_sysreg_el1(ctxt->sys_regs[FAR_EL1],	far);
	write_sysreg_el1(ctxt->sys_regs[MAIR_EL1],	mair);
	write_sysreg_el1(ctxt->sys_regs[VBAR_EL1],	vbar);
	write_sysreg_el1(ctxt->sys_regs[CONTEXTIDR_EL1],contextidr);
	write_sysreg_el1(ctxt->sys_regs[AMAIR_EL1],	amair);
	write_sysreg_el1(ctxt->sys_regs[CNTKCTL_EL1], 	cntkctl);
	write_sysreg(ctxt->sys_regs[PAR_EL1],		par_el1);
	write_sysreg(ctxt->sys_regs[TPIDR_EL1],		tpidr_el1);

	write_sysreg(ctxt->gp_regs.sp_el1,		sp_el1);
	write_sysreg_el1(ctxt->gp_regs.elr_el1,		elr);
	write_sysreg_el1(ctxt->gp_regs.spsr[KVM_SPSR_EL1],spsr);
	write_sysreg_el2(ctxt->gp_regs.regs.pc,		elr);
	write_sysreg_el2(ctxt->gp_regs.regs.pstate,	spsr);
}

static hyp_alternate_select(__sysreg_call_restore_host_state,
			    __sysreg_restore_state, __sysreg_do_nothing,
			    ARM64_HAS_VIRT_HOST_EXTN);

void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt)
{
	__sysreg_call_restore_host_state()(ctxt);
	__sysreg_restore_common_state(ctxt);
}

void __hyp_text __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt)
{
	__sysreg_restore_state(ctxt);
	__sysreg_restore_common_state(ctxt);
}

void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
{
	u64 *spsr, *sysreg;

	if (read_sysreg(hcr_el2) & HCR_RW)
		return;

	spsr = vcpu->arch.ctxt.gp_regs.spsr;
	sysreg = vcpu->arch.ctxt.sys_regs;

	spsr[KVM_SPSR_ABT] = read_sysreg(spsr_abt);
	spsr[KVM_SPSR_UND] = read_sysreg(spsr_und);
	spsr[KVM_SPSR_IRQ] = read_sysreg(spsr_irq);
	spsr[KVM_SPSR_FIQ] = read_sysreg(spsr_fiq);

	sysreg[DACR32_EL2] = read_sysreg(dacr32_el2);
	sysreg[IFSR32_EL2] = read_sysreg(ifsr32_el2);

	if (__fpsimd_enabled())
		sysreg[FPEXC32_EL2] = read_sysreg(fpexc32_el2);

	if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
		sysreg[DBGVCR32_EL2] = read_sysreg(dbgvcr32_el2);
}

void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
{
	u64 *spsr, *sysreg;

	if (read_sysreg(hcr_el2) & HCR_RW)
		return;

	spsr = vcpu->arch.ctxt.gp_regs.spsr;
	sysreg = vcpu->arch.ctxt.sys_regs;

	write_sysreg(spsr[KVM_SPSR_ABT], spsr_abt);
	write_sysreg(spsr[KVM_SPSR_UND], spsr_und);
	write_sysreg(spsr[KVM_SPSR_IRQ], spsr_irq);
	write_sysreg(spsr[KVM_SPSR_FIQ], spsr_fiq);

	write_sysreg(sysreg[DACR32_EL2], dacr32_el2);
	write_sysreg(sysreg[IFSR32_EL2], ifsr32_el2);

	if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
		write_sysreg(sysreg[DBGVCR32_EL2], dbgvcr32_el2);
}

void __hyp_text __kvm_set_tpidr_el2(u64 tpidr_el2)
{
	asm("msr tpidr_el2, %0": : "r" (tpidr_el2));
}