2 * Copyright (c) 2003-2013 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Mihai Carabas <mihai.carabas@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/sysproto.h>
43 #include <sys/thread2.h>
44 #include <sys/spinlock2.h>
46 #include <machine/cpu.h>
47 #include <machine/vmm.h>
50 * vmm guest system call:
51 * - init the calling thread structure
52 * - prepare for running in non-root mode
55 sys_vmm_guest_ctl(struct vmm_guest_ctl_args *uap)
58 struct vmm_guest_options options;
59 struct trapframe *tf = uap->sysmsg_frame;
60 unsigned long stack_limit = USRSTACK;
61 unsigned char stack_page[PAGE_SIZE];
67 error = copyin(uap->options, &options, sizeof(struct vmm_guest_options));
69 kprintf("sys_vmm_guest: error copyin vmm_guest_options\n");
73 while(stack_limit > tf->tf_sp) {
74 stack_limit -= PAGE_SIZE;
75 options.new_stack -= PAGE_SIZE;
77 error = copyin((const void *)stack_limit, (void *)stack_page, PAGE_SIZE);
79 kprintf("sys_vmm_guest: error copyin stack\n");
83 error = copyout((const void *)stack_page, (void *)options.new_stack, PAGE_SIZE);
85 kprintf("sys_vmm_guest: error copyout stack\n");
90 bcopy(tf, &options.tf, sizeof(struct trapframe));
92 error = vmm_vminit(&options);
94 if (error == ENODEV) {
95 kprintf("sys_vmm_guest: vmm_vminit failed -"
96 "no VMM available \n");
99 kprintf("sys_vmm_guest: vmm_vminit failed\n");
104 generic_lwp_return(curthread->td_lwp, tf);
110 kprintf("sys_vmm_guest: INVALID op\n");
115 exit1(W_EXITCODE(error, 0));
122 vmm_exit_vmm(void *dummy __unused)
127 sys_vmm_guest_sync_addr(struct vmm_guest_sync_addr_args *uap)
134 struct proc *p = curproc;
136 if (p->p_vmm == NULL)
139 crit_enter_id("vmm_inval");
142 * Acquire CPULOCK_EXCL, spin while we wait.
144 KKASSERT(CPUMASK_TESTMASK(p->p_vmm_cpumask, mycpu->gd_cpumask) == 0);
146 olock = p->p_vmm_cpulock & ~CPULOCK_EXCL;
148 nlock = olock | CPULOCK_EXCL;
149 if (atomic_cmpset_int(&p->p_vmm_cpulock, olock, nlock))
156 * Wait for other cpu's to exit VMM mode (for this vkernel). No
157 * new cpus will enter VMM mode while we hold the lock. New waiters
158 * may turn-up though so the wakeup() later on has to be
161 * We must test on p_vmm_cpulock's counter, not the mask, because
162 * VMM entries will set the mask bit unconditionally first
163 * (interlocking our IPI below) and then conditionally bump the
166 if (olock & CPULOCK_CNTMASK) {
167 mask = p->p_vmm_cpumask;
168 CPUMASK_ANDMASK(mask, mycpu->gd_other_cpus);
169 lwkt_send_ipiq_mask(mask, vmm_exit_vmm, NULL);
170 while (p->p_vmm_cpulock & CPULOCK_CNTMASK) {
177 * Make the requested modification, wakeup any waiters.
179 copyin(uap->srcaddr, &val, sizeof(long));
180 copyout(&val, uap->dstaddr, sizeof(long));
182 atomic_clear_int(&p->p_vmm_cpulock, CPULOCK_EXCL);
183 wakeup(&p->p_vmm_cpulock);
185 crit_exit_id("vmm_inval");