[deliverable/linux.git] / arch / arm64 / kvm / hyp / hyp.h

/*
 * Copyright (C) 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/>.
 */

#ifndef __ARM64_KVM_HYP_H__
#define __ARM64_KVM_HYP_H__

#include <linux/compiler.h>
#include <linux/kvm_host.h>
#include <asm/kvm_mmu.h>
#include <asm/sysreg.h>

#define __hyp_text __section(.hyp.text) notrace

static inline unsigned long __kern_hyp_va(unsigned long v)
{
	asm volatile(ALTERNATIVE("and %0, %0, %1",
				 "nop",
				 ARM64_HAS_VIRT_HOST_EXTN)
		     : "+r" (v) : "i" (HYP_PAGE_OFFSET_MASK));
	return v;
}

#define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v)))

static inline unsigned long __hyp_kern_va(unsigned long v)
{
	u64 offset = PAGE_OFFSET - HYP_PAGE_OFFSET;
	asm volatile(ALTERNATIVE("add %0, %0, %1",
				 "nop",
				 ARM64_HAS_VIRT_HOST_EXTN)
		     : "+r" (v) : "r" (offset));
	return v;
}

#define hyp_kern_va(v) (typeof(v))(__hyp_kern_va((unsigned long)(v)))

/**
 * hyp_alternate_select - Generates patchable code sequences that are
 * used to switch between two implementations of a function, depending
 * on the availability of a feature.
 *
 * @fname: a symbol name that will be defined as a function returning a
 * function pointer whose type will match @orig and @alt
 * @orig: A pointer to the default function, as returned by @fname when
 * @cond doesn't hold
 * @alt: A pointer to the alternate function, as returned by @fname
 * when @cond holds
 * @cond: a CPU feature (as described in asm/cpufeature.h)
 */
#define hyp_alternate_select(fname, orig, alt, cond)			\
typeof(orig) * __hyp_text fname(void)					\
{									\
	typeof(alt) *val = orig;					\
	asm volatile(ALTERNATIVE("nop		\n",			\
				 "mov	%0, %1	\n",			\
				 cond)					\
		     : "+r" (val) : "r" (alt));				\
	return val;							\
}

void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);

void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);

void __timer_save_state(struct kvm_vcpu *vcpu);
void __timer_restore_state(struct kvm_vcpu *vcpu);

void __sysreg_save_state(struct kvm_cpu_context *ctxt);
void __sysreg_restore_state(struct kvm_cpu_context *ctxt);
void __sysreg32_save_state(struct kvm_vcpu *vcpu);
void __sysreg32_restore_state(struct kvm_vcpu *vcpu);

void __debug_save_state(struct kvm_vcpu *vcpu,
			struct kvm_guest_debug_arch *dbg,
			struct kvm_cpu_context *ctxt);
void __debug_restore_state(struct kvm_vcpu *vcpu,
			   struct kvm_guest_debug_arch *dbg,
			   struct kvm_cpu_context *ctxt);
void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);

void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
static inline bool __fpsimd_enabled(void)
{
	return !(read_sysreg(cptr_el2) & CPTR_EL2_TFP);
}

u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
void __noreturn __hyp_do_panic(unsigned long, ...);

#endif /* __ARM64_KVM_HYP_H__ */
Commit	Line	Data
c76a0a66 MZ	1	/*
	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
cedbb8b7 MZ	28	static inline unsigned long __kern_hyp_va(unsigned long v)
	29	{
	30	asm volatile(ALTERNATIVE("and %0, %0, %1",
	31	"nop",
	32	ARM64_HAS_VIRT_HOST_EXTN)
	33	: "+r" (v) : "i" (HYP_PAGE_OFFSET_MASK));
	34	return v;
	35	}
	36
	37	#define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v)))
	38
	39	static inline unsigned long __hyp_kern_va(unsigned long v)
	40	{
	41	u64 offset = PAGE_OFFSET - HYP_PAGE_OFFSET;
	42	asm volatile(ALTERNATIVE("add %0, %0, %1",
	43	"nop",
	44	ARM64_HAS_VIRT_HOST_EXTN)
	45	: "+r" (v) : "r" (offset));
	46	return v;
	47	}
	48
	49	#define hyp_kern_va(v) (typeof(v))(__hyp_kern_va((unsigned long)(v)))
c76a0a66	50
c1bf6e18 MZ	51	/**
	52	* hyp_alternate_select - Generates patchable code sequences that are
	53	* used to switch between two implementations of a function, depending
	54	* on the availability of a feature.
	55	*
	56	* @fname: a symbol name that will be defined as a function returning a
	57	* function pointer whose type will match @orig and @alt
	58	* @orig: A pointer to the default function, as returned by @fname when
	59	* @cond doesn't hold
	60	* @alt: A pointer to the alternate function, as returned by @fname
	61	* when @cond holds
	62	* @cond: a CPU feature (as described in asm/cpufeature.h)
	63	*/
	64	#define hyp_alternate_select(fname, orig, alt, cond) \
	65	typeof(orig) * __hyp_text fname(void) \
	66	{ \
	67	typeof(alt) *val = orig; \
	68	asm volatile(ALTERNATIVE("nop \n", \
	69	"mov %0, %1 \n", \
	70	cond) \
	71	: "+r" (val) : "r" (alt)); \
	72	return val; \
	73	}
	74
06282fd2 MZ	75	void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
	76	void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
	77
f68d2b1b MZ	78	void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
	79	void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
	80
1431af36 MZ	81	void __timer_save_state(struct kvm_vcpu *vcpu);
	82	void __timer_restore_state(struct kvm_vcpu *vcpu);
	83
6d6ec20f MZ	84	void __sysreg_save_state(struct kvm_cpu_context *ctxt);
6d6ec20f MZ	85	void __sysreg_restore_state(struct kvm_cpu_context *ctxt);
c209ec85 MZ	86	void __sysreg32_save_state(struct kvm_vcpu *vcpu);
c209ec85 MZ	87	void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
6d6ec20f	88
8eb99267 MZ	89	void __debug_save_state(struct kvm_vcpu *vcpu,
	90	struct kvm_guest_debug_arch *dbg,
	91	struct kvm_cpu_context *ctxt);
	92	void __debug_restore_state(struct kvm_vcpu *vcpu,
	93	struct kvm_guest_debug_arch *dbg,
	94	struct kvm_cpu_context *ctxt);
	95	void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
	96	void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);
	97
c13d1683 MZ	98	void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
	99	void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
	100	static inline bool __fpsimd_enabled(void)
	101	{
	102	return !(read_sysreg(cptr_el2) & CPTR_EL2_TFP);
	103	}
	104
b97b66c1	105	u64 __guest_enter(struct kvm_vcpu vcpu, struct kvm_cpu_context host_ctxt);
53fd5b64	106	void __noreturn __hyp_do_panic(unsigned long, ...);
b97b66c1	107
c76a0a66 MZ	108	#endif /* __ARM64_KVM_HYP_H__ */
c76a0a66 MZ	109