263 lines
6.2 KiB
C
263 lines
6.2 KiB
C
/*
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*
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* Copyright (c) 2004 Christian Limpach.
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* Copyright (c) 2004-2006,2008 Kip Macy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christian Limpach.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <sys/systm.h>
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#include <machine/xen/xen-os.h>
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#include <xen/hypervisor.h>
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#include <xen/gnttab.h>
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#include <xen/xen_intr.h>
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#include <xen/xenbus/xenbusvar.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#ifdef XENHVM
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#include <dev/xen/xenpci/xenpcivar.h>
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#else
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static void xen_suspend(void);
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#endif
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static void
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shutdown_handler(struct xenbus_watch *watch,
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const char **vec, unsigned int len)
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{
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char *str;
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struct xenbus_transaction xbt;
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int error, howto;
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howto = 0;
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again:
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error = xenbus_transaction_start(&xbt);
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if (error)
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return;
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error = xenbus_read(xbt, "control", "shutdown", NULL, (void **) &str);
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/* Ignore read errors and empty reads. */
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if (error || strlen(str) == 0) {
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xenbus_transaction_end(xbt, 1);
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return;
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}
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xenbus_write(xbt, "control", "shutdown", "");
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error = xenbus_transaction_end(xbt, 0);
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if (error == EAGAIN) {
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free(str, M_DEVBUF);
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goto again;
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}
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if (strcmp(str, "reboot") == 0)
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howto = 0;
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else if (strcmp(str, "poweroff") == 0)
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howto |= (RB_POWEROFF | RB_HALT);
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else if (strcmp(str, "halt") == 0)
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#ifdef XENHVM
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/*
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* We rely on acpi powerdown to halt the VM.
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*/
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howto |= (RB_POWEROFF | RB_HALT);
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#else
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howto |= RB_HALT;
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#endif
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else if (strcmp(str, "suspend") == 0)
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howto = -1;
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else {
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printf("Ignoring shutdown request: %s\n", str);
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goto done;
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}
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if (howto == -1) {
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xen_suspend();
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goto done;
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}
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shutdown_nice(howto);
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done:
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free(str, M_DEVBUF);
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}
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#ifndef XENHVM
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/*
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* In HV mode, we let acpi take care of halts and reboots.
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*/
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static void
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xen_shutdown_final(void *arg, int howto)
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{
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if (howto & (RB_HALT | RB_POWEROFF))
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HYPERVISOR_shutdown(SHUTDOWN_poweroff);
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else
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HYPERVISOR_shutdown(SHUTDOWN_reboot);
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}
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#endif
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static struct xenbus_watch shutdown_watch = {
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.node = "control/shutdown",
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.callback = shutdown_handler
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};
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static void
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setup_shutdown_watcher(void *unused)
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{
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if (register_xenbus_watch(&shutdown_watch))
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printf("Failed to set shutdown watcher\n");
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#ifndef XENHVM
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EVENTHANDLER_REGISTER(shutdown_final, xen_shutdown_final, NULL,
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SHUTDOWN_PRI_LAST);
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#endif
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}
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SYSINIT(shutdown, SI_SUB_PSEUDO, SI_ORDER_ANY, setup_shutdown_watcher, NULL);
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#ifndef XENHVM
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extern void xencons_suspend(void);
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extern void xencons_resume(void);
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static void
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xen_suspend()
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{
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int i, j, k, fpp;
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unsigned long max_pfn, start_info_mfn;
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#ifdef SMP
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cpumask_t map;
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/*
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* Bind us to CPU 0 and stop any other VCPUs.
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*/
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mtx_lock_spin(&sched_lock);
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sched_bind(curthread, 0);
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mtx_unlock_spin(&sched_lock);
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KASSERT(PCPU_GET(cpuid) == 0, ("xen_suspend: not running on cpu 0"));
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map = PCPU_GET(other_cpus) & ~stopped_cpus;
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if (map)
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stop_cpus(map);
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#endif
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if (DEVICE_SUSPEND(root_bus) != 0) {
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printf("xen_suspend: device_suspend failed\n");
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if (map)
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restart_cpus(map);
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return;
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}
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local_irq_disable();
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xencons_suspend();
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gnttab_suspend();
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max_pfn = HYPERVISOR_shared_info->arch.max_pfn;
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void *shared_info = HYPERVISOR_shared_info;
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HYPERVISOR_shared_info = NULL;
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pmap_kremove((vm_offset_t) shared_info);
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PT_UPDATES_FLUSH();
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xen_start_info->store_mfn = MFNTOPFN(xen_start_info->store_mfn);
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xen_start_info->console.domU.mfn = MFNTOPFN(xen_start_info->console.domU.mfn);
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/*
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* We'll stop somewhere inside this hypercall. When it returns,
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* we'll start resuming after the restore.
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*/
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start_info_mfn = VTOMFN(xen_start_info);
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pmap_suspend();
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HYPERVISOR_suspend(start_info_mfn);
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pmap_resume();
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pmap_kenter_ma((vm_offset_t) shared_info, xen_start_info->shared_info);
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HYPERVISOR_shared_info = shared_info;
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HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
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VTOMFN(xen_pfn_to_mfn_frame_list_list);
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fpp = PAGE_SIZE/sizeof(unsigned long);
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for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) {
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if ((j % fpp) == 0) {
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k++;
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xen_pfn_to_mfn_frame_list_list[k] =
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VTOMFN(xen_pfn_to_mfn_frame_list[k]);
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j = 0;
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}
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xen_pfn_to_mfn_frame_list[k][j] =
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VTOMFN(&xen_phys_machine[i]);
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}
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HYPERVISOR_shared_info->arch.max_pfn = max_pfn;
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gnttab_resume();
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irq_resume();
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local_irq_enable();
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xencons_resume();
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#ifdef CONFIG_SMP
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for_each_cpu(i)
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vcpu_prepare(i);
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#endif
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/*
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* Only resume xenbus /after/ we've prepared our VCPUs; otherwise
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* the VCPU hotplug callback can race with our vcpu_prepare
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*/
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DEVICE_RESUME(root_bus);
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#ifdef SMP
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sched_unbind(curthread);
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if (map)
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restart_cpus(map);
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#endif
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}
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#endif
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