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xen: Add suspend/resume support for PV on HVM guests.

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Suspend/resume requires few different things on HVM: the suspend
hypercall is different; we don't need to save/restore memory related
settings; except the shared info page and the callback mechanism.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Stefano Stabellini 2010-05-14 12:45:07 +01:00 • committed by Jeremy Fitzhardinge
parent 183d03cc4f
commit 016b6f5fe8
6 changed files with 90 additions and 11 deletions
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45
drivers/xen/manage.c
View file

@ -9,6 +9,7 @@
#include <linux/stop_machine.h>
#include <linux/freezer.h>
#include <xen/xen.h>
#include <xen/xenbus.h>
#include <xen/grant_table.h>
#include <xen/events.h>
@ -17,6 +18,7 @@
#include <asm/xen/hypercall.h>
#include <asm/xen/page.h>
#include <asm/xen/hypervisor.h>
enum shutdown_state {
SHUTDOWN_INVALID = -1,
@ -33,10 +35,30 @@ enum shutdown_state {
static enum shutdown_state shutting_down = SHUTDOWN_INVALID;
#ifdef CONFIG_PM_SLEEP
static int xen_hvm_suspend(void *data)
{
struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
int *cancelled = data;
BUG_ON(!irqs_disabled());
*cancelled = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
xen_hvm_post_suspend(*cancelled);
gnttab_resume();
if (!*cancelled) {
xen_irq_resume();
xen_timer_resume();
}
return 0;
}
static int xen_suspend(void *data)
{
int *cancelled = data;
int err;
int *cancelled = data;
BUG_ON(!irqs_disabled());
@ -106,7 +128,10 @@ static void do_suspend(void)
goto out_resume;
}
err = stop_machine(xen_suspend, &cancelled, cpumask_of(0));
if (xen_hvm_domain())
err = stop_machine(xen_hvm_suspend, &cancelled, cpumask_of(0));
else
err = stop_machine(xen_suspend, &cancelled, cpumask_of(0));
dpm_resume_noirq(PMSG_RESUME);
@ -255,7 +280,19 @@ static int shutdown_event(struct notifier_block *notifier,
return NOTIFY_DONE;
}
static int __init setup_shutdown_event(void)
static int __init __setup_shutdown_event(void)
{
/* Delay initialization in the PV on HVM case */
if (xen_hvm_domain())
return 0;
if (!xen_pv_domain())
return -ENODEV;
return xen_setup_shutdown_event();
}
int xen_setup_shutdown_event(void)
{
static struct notifier_block xenstore_notifier = {
.notifier_call = shutdown_event
@ -266,4 +303,4 @@ static int __init setup_shutdown_event(void)
}
EXPORT_SYMBOL_GPL(xen_setup_shutdown_event);
subsys_initcall(setup_shutdown_event);
subsys_initcall(__setup_shutdown_event);