/*	$NetBSD: nvmm_internal.h,v 1.12.2.5 2020/08/18 09:29:52 martin Exp $	*/

/*
 * Copyright (c) 2018-2020 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Maxime Villard.
 *
 * 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, 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

#ifndef _NVMM_INTERNAL_H_
#define _NVMM_INTERNAL_H_

#define NVMM_MAX_MACHINES	128
#define NVMM_MAX_VCPUS		256
#define NVMM_MAX_HMAPPINGS	32
#define NVMM_MAX_RAM		(128ULL * (1 << 30))

struct nvmm_owner {
	pid_t pid;
};

struct nvmm_cpu {
	/* Shared. */
	bool present;
	nvmm_cpuid_t cpuid;
	kmutex_t lock;

	/* Comm page. */
	struct nvmm_comm_page *comm;

	/* Last host CPU on which the VCPU ran. */
	int hcpu_last;

	/* Implementation-specific. */
	void *cpudata;
};

struct nvmm_hmapping {
	bool present;
	uintptr_t hva;
	size_t size;
	struct uvm_object *uobj;
};

struct nvmm_machine {
	bool present;
	nvmm_machid_t machid;
	time_t time;
	struct nvmm_owner *owner;
	krwlock_t lock;

	/* Comm */
	struct uvm_object *commuobj;

	/* Kernel */
	struct vmspace *vm;
	gpaddr_t gpa_begin;
	gpaddr_t gpa_end;

	/* Host Mappings */
	struct nvmm_hmapping hmap[NVMM_MAX_HMAPPINGS];

	/* CPU */
	volatile unsigned int ncpus;
	struct nvmm_cpu cpus[NVMM_MAX_VCPUS];

	/* Implementation-specific */
	void *machdata;
};

struct nvmm_impl {
	const char *name;
	bool (*ident)(void);
	void (*init)(void);
	void (*fini)(void);
	void (*capability)(struct nvmm_capability *);

	size_t mach_conf_max;
	const size_t *mach_conf_sizes;

	size_t vcpu_conf_max;
	const size_t *vcpu_conf_sizes;

	size_t state_size;

	void (*machine_create)(struct nvmm_machine *);
	void (*machine_destroy)(struct nvmm_machine *);
	int (*machine_configure)(struct nvmm_machine *, uint64_t, void *);

	int (*vcpu_create)(struct nvmm_machine *, struct nvmm_cpu *);
	void (*vcpu_destroy)(struct nvmm_machine *, struct nvmm_cpu *);
	int (*vcpu_configure)(struct nvmm_cpu *, uint64_t, void *);
	void (*vcpu_setstate)(struct nvmm_cpu *);
	void (*vcpu_getstate)(struct nvmm_cpu *);
	int (*vcpu_inject)(struct nvmm_cpu *);
	int (*vcpu_run)(struct nvmm_machine *, struct nvmm_cpu *,
	    struct nvmm_vcpu_exit *);
};

#if defined(__x86_64__)
extern const struct nvmm_impl nvmm_x86_svm;
extern const struct nvmm_impl nvmm_x86_vmx;
#endif

static inline bool
nvmm_return_needed(void)
{
	lwp_t *l = curlwp;
	int needed;

	KPREEMPT_DISABLE(l);
	needed = l->l_cpu->ci_want_resched;
	KPREEMPT_ENABLE(l);
	if (needed) {
		return true;
	}
	if (curlwp->l_flag & LW_USERRET) {
		return true;
	}
	return false;
}

#endif /* _NVMM_INTERNAL_H_ */