xen: Add suspend/resume support for PV on HVM guests.
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>
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b211a04..127c95c 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1262,13 +1262,15 @@
return 0;
}
-static void __init init_shared_info(void)
+void xen_hvm_init_shared_info(void)
{
+ int cpu;
struct xen_add_to_physmap xatp;
- struct shared_info *shared_info_page;
+ static struct shared_info *shared_info_page = 0;
- shared_info_page = (struct shared_info *)
- extend_brk(PAGE_SIZE, PAGE_SIZE);
+ if (!shared_info_page)
+ shared_info_page = (struct shared_info *)
+ extend_brk(PAGE_SIZE, PAGE_SIZE);
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
@@ -1278,7 +1280,17 @@
HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
- per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
+ /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
+ * page, we use it in the event channel upcall and in some pvclock
+ * related functions. We don't need the vcpu_info placement
+ * optimizations because we don't use any pv_mmu or pv_irq op on
+ * HVM.
+ * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
+ * online but xen_hvm_init_shared_info is run at resume time too and
+ * in that case multiple vcpus might be online. */
+ for_each_online_cpu(cpu) {
+ per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+ }
}
static int __cpuinit xen_hvm_cpu_notify(struct notifier_block *self,
@@ -1308,7 +1320,7 @@
if (r < 0)
return;
- init_shared_info();
+ xen_hvm_init_shared_info();
if (xen_feature(XENFEAT_hvm_callback_vector))
xen_have_vector_callback = 1;
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index a9c66110..d07479c 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -26,6 +26,12 @@
BUG();
}
+void xen_hvm_post_suspend(int suspend_cancelled)
+{
+ xen_hvm_init_shared_info();
+ xen_callback_vector();
+}
+
void xen_post_suspend(int suspend_cancelled)
{
xen_build_mfn_list_list();
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 0d0e0e6..01c9dd3 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -39,6 +39,7 @@
void xen_vcpu_restore(void);
void xen_callback_vector(void);
+void xen_hvm_init_shared_info(void);
void __init xen_build_dynamic_phys_to_machine(void);
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index af9c559..1799bd8 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -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 @@
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 @@
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 @@
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 @@
}
EXPORT_SYMBOL_GPL(xen_setup_shutdown_event);
-subsys_initcall(setup_shutdown_event);
+subsys_initcall(__setup_shutdown_event);
diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index a0ee5d0..bdb44f2 100644
--- a/drivers/xen/platform-pci.c
+++ b/drivers/xen/platform-pci.c
@@ -31,6 +31,7 @@
#include <xen/xenbus.h>
#include <xen/events.h>
#include <xen/hvm.h>
+#include <xen/xen-ops.h>
#define DRV_NAME "xen-platform-pci"
@@ -41,6 +42,7 @@
static unsigned long platform_mmio;
static unsigned long platform_mmio_alloc;
static unsigned long platform_mmiolen;
+static uint64_t callback_via;
unsigned long alloc_xen_mmio(unsigned long len)
{
@@ -85,13 +87,25 @@
"xen-platform-pci", pdev);
}
+static int platform_pci_resume(struct pci_dev *pdev)
+{
+ int err;
+ if (xen_have_vector_callback)
+ return 0;
+ err = xen_set_callback_via(callback_via);
+ if (err) {
+ dev_err(&pdev->dev, "platform_pci_resume failure!\n");
+ return err;
+ }
+ return 0;
+}
+
static int __devinit platform_pci_init(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int i, ret;
long ioaddr, iolen;
long mmio_addr, mmio_len;
- uint64_t callback_via;
unsigned int max_nr_gframes;
i = pci_enable_device(pdev);
@@ -148,6 +162,9 @@
if (ret)
goto out;
xenbus_probe(NULL);
+ ret = xen_setup_shutdown_event();
+ if (ret)
+ goto out;
return 0;
out:
@@ -171,6 +188,9 @@
.name = DRV_NAME,
.probe = platform_pci_init,
.id_table = platform_pci_tbl,
+#ifdef CONFIG_PM
+ .resume_early = platform_pci_resume,
+#endif
};
static int __init platform_pci_module_init(void)
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 883a21b..46bc81e 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -7,6 +7,7 @@
void xen_pre_suspend(void);
void xen_post_suspend(int suspend_cancelled);
+void xen_hvm_post_suspend(int suspend_cancelled);
void xen_mm_pin_all(void);
void xen_mm_unpin_all(void);
@@ -14,4 +15,6 @@
void xen_timer_resume(void);
void xen_arch_resume(void);
+int xen_setup_shutdown_event(void);
+
#endif /* INCLUDE_XEN_OPS_H */