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Marc Zyngierc76a0a62015-10-21 10:09:49 +01001/*
2 * Copyright (C) 2015 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#ifndef __ARM64_KVM_HYP_H__
19#define __ARM64_KVM_HYP_H__
20
21#include <linux/compiler.h>
22#include <linux/kvm_host.h>
23#include <asm/kvm_mmu.h>
24#include <asm/sysreg.h>
25
26#define __hyp_text __section(.hyp.text) notrace
27
28#define kern_hyp_va(v) (typeof(v))((unsigned long)(v) & HYP_PAGE_OFFSET_MASK)
29#define hyp_kern_va(v) (typeof(v))((unsigned long)(v) - HYP_PAGE_OFFSET \
30 + PAGE_OFFSET)
31
Marc Zyngierc1bf6e12015-10-28 08:45:37 +000032/**
33 * hyp_alternate_select - Generates patchable code sequences that are
34 * used to switch between two implementations of a function, depending
35 * on the availability of a feature.
36 *
37 * @fname: a symbol name that will be defined as a function returning a
38 * function pointer whose type will match @orig and @alt
39 * @orig: A pointer to the default function, as returned by @fname when
40 * @cond doesn't hold
41 * @alt: A pointer to the alternate function, as returned by @fname
42 * when @cond holds
43 * @cond: a CPU feature (as described in asm/cpufeature.h)
44 */
45#define hyp_alternate_select(fname, orig, alt, cond) \
46typeof(orig) * __hyp_text fname(void) \
47{ \
48 typeof(alt) *val = orig; \
49 asm volatile(ALTERNATIVE("nop \n", \
50 "mov %0, %1 \n", \
51 cond) \
52 : "+r" (val) : "r" (alt)); \
53 return val; \
54}
55
Marc Zyngier06282fd2015-10-19 15:50:37 +010056void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
57void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
58
Marc Zyngierf68d2b12015-10-19 15:50:58 +010059void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
60void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
61
Marc Zyngier1431af32015-10-19 16:32:20 +010062void __timer_save_state(struct kvm_vcpu *vcpu);
63void __timer_restore_state(struct kvm_vcpu *vcpu);
64
Marc Zyngier6d6ec202015-10-19 18:02:48 +010065void __sysreg_save_state(struct kvm_cpu_context *ctxt);
66void __sysreg_restore_state(struct kvm_cpu_context *ctxt);
Marc Zyngierc209ec82015-10-19 19:28:29 +010067void __sysreg32_save_state(struct kvm_vcpu *vcpu);
68void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
Marc Zyngier6d6ec202015-10-19 18:02:48 +010069
Marc Zyngier8eb99262015-10-19 21:02:46 +010070void __debug_save_state(struct kvm_vcpu *vcpu,
71 struct kvm_guest_debug_arch *dbg,
72 struct kvm_cpu_context *ctxt);
73void __debug_restore_state(struct kvm_vcpu *vcpu,
74 struct kvm_guest_debug_arch *dbg,
75 struct kvm_cpu_context *ctxt);
76void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
77void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);
78
Marc Zyngierc13d1682015-10-26 08:34:09 +000079void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
80void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
81static inline bool __fpsimd_enabled(void)
82{
83 return !(read_sysreg(cptr_el2) & CPTR_EL2_TFP);
84}
85
Marc Zyngierb97b66c2015-10-22 08:32:18 +010086u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
Marc Zyngier53fd5b62015-10-25 15:21:52 +000087void __noreturn __hyp_do_panic(unsigned long, ...);
Marc Zyngierb97b66c2015-10-22 08:32:18 +010088
Marc Zyngierc76a0a62015-10-21 10:09:49 +010089#endif /* __ARM64_KVM_HYP_H__ */
90