xref: /freebsd-10.3-release/sys/amd64/vmm/amd/svm.h

/*-
 * Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: projects/bhyve_svm/sys/amd64/vmm/amd/svm.h 249967 2013-04-27 04:49:51Z neel $
 */

#ifndef _SVM_H_
#define _SVM_H_

#define BIT(n)			(1ULL << n)
#define ERR(fmt, args...)	\
	printf("SVM ERROR:%s " fmt "\n", __func__, ##args);

/*
 * Software saved machine state for guest and host.
 */

/* Additional guest register state */
struct svm_gctx {
	register_t	sctx_rdx;
	register_t	sctx_rdi;
	register_t	sctx_rsi;
	/* Points to host context area. */
	register_t	sctx_hostctx_base;
};

/* Additional host register state */
struct svm_hctx {
	uint16_t	sctx_fs;
	uint16_t	sctx_gs;

	register_t	sctx_rsp;
};

/* Common register context area for guest and host. */
struct svm_regctx {
	register_t	sctx_rbp;

	register_t 	sctx_rbx;
	register_t	sctx_rcx;

	register_t	sctx_r8;
	register_t	sctx_r9;
	register_t	sctx_r10;
	register_t	sctx_r11;
	register_t	sctx_r12;
	register_t	sctx_r13;
	register_t	sctx_r14;
	register_t	sctx_r15;

	union {
		struct svm_hctx h;	/* host-specific register state */
		struct svm_gctx g;	/* guest-specific register state */
	} e;
};

void svm_launch(uint64_t pa, struct svm_regctx *, struct svm_regctx *);

static __inline void
disable_gintr(void)
{

        __asm __volatile("clgi" : : :);
}

static __inline void
enable_gintr(void)
{

        __asm __volatile("stgi" : : :);
}

static __inline void
save_cr2(uint64_t *cr2)
{

	__asm __volatile(
		"mov %%cr2, %%rax; movq %%rax, %0"
		:"=m"(*cr2)
		:
		:"rax", "memory");
}

static __inline void
load_cr2(uint64_t *cr2)
{
	__asm __volatile(
		"movq %0, %%rax; movq %%rax, %%cr2"
		:
		:"m"(*cr2)
		:"rax");
}

#endif /* _SVM_H_ */