Merge tag 'stable/for-linus-3.14-rc0-late-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen bugfixes from Konrad Rzeszutek Wilk:
 "Bug-fixes for the new features that were added during this cycle.

  There are also two fixes for long-standing issues for which we have a
  solution: grant-table operations extra work that was not needed
  causing performance issues and the self balloon code was too
  aggressive causing OOMs.

  Details:
   - Xen ARM couldn't use the new FIFO events
   - Xen ARM couldn't use the SWIOTLB if compiled as 32-bit with 64-bit PCIe devices.
   - Grant table were doing needless M2P operations.
   - Ratchet down the self-balloon code so it won't OOM.
   - Fix misplaced kfree in Xen PVH error code paths"

* tag 'stable/for-linus-3.14-rc0-late-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/pvh: Fix misplaced kfree from xlated_setup_gnttab_pages
  drivers: xen: deaggressive selfballoon driver
  xen/grant-table: Avoid m2p_override during mapping
  xen/gnttab: Use phys_addr_t to describe the grant frame base address
  xen: swiotlb: handle sizeof(dma_addr_t) != sizeof(phys_addr_t)
  arm/xen: Initialize event channels earlier

2 files changed, 48 insertions, 30 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index dc6ef9a2c649..e25419817791 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1905,6 +1905,7 @@ config XEN
 	depends on !GENERIC_ATOMIC64
 	select ARM_PSCI
 	select SWIOTLB_XEN
+	select ARCH_DMA_ADDR_T_64BIT
 	help
 	  Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
 
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 2162172c0ddc..b96723e258a0 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -23,6 +23,7 @@
 #include <linux/of_address.h>
 #include <linux/cpuidle.h>
 #include <linux/cpufreq.h>
+#include <linux/cpu.h>
 
 #include <linux/mm.h>
 
@@ -154,7 +155,7 @@ int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
 }
 EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
 
-static void __init xen_percpu_init(void *unused)
+static void xen_percpu_init(void)
 {
 	struct vcpu_register_vcpu_info info;
 	struct vcpu_info *vcpup;
@@ -193,6 +194,31 @@ static void xen_power_off(void)
 		BUG();
 }
 
+static int xen_cpu_notification(struct notifier_block *self,
+				unsigned long action,
+				void *hcpu)
+{
+	switch (action) {
+	case CPU_STARTING:
+		xen_percpu_init();
+		break;
+	default:
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block xen_cpu_notifier = {
+	.notifier_call = xen_cpu_notification,
+};
+
+static irqreturn_t xen_arm_callback(int irq, void *arg)
+{
+	xen_hvm_evtchn_do_upcall();
+	return IRQ_HANDLED;
+}
+
 /*
  * see Documentation/devicetree/bindings/arm/xen.txt for the
  * documentation of the Xen Device Tree format.
@@ -208,7 +234,7 @@ static int __init xen_guest_init(void)
 	const char *version = NULL;
 	const char *xen_prefix = "xen,xen-";
 	struct resource res;
-	unsigned long grant_frames;
+	phys_addr_t grant_frames;
 
 	node = of_find_compatible_node(NULL, NULL, "xen,xen");
 	if (!node) {
@@ -227,8 +253,12 @@ static int __init xen_guest_init(void)
 		return 0;
 	grant_frames = res.start;
 	xen_events_irq = irq_of_parse_and_map(node, 0);
-	pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
-			version, xen_events_irq, (grant_frames >> PAGE_SHIFT));
+	pr_info("Xen %s support found, events_irq=%d gnttab_frame=%pa\n",
+			version, xen_events_irq, &grant_frames);
+
+	if (xen_events_irq < 0)
+		return -ENODEV;
+
 	xen_domain_type = XEN_HVM_DOMAIN;
 
 	xen_setup_features();
@@ -281,9 +311,21 @@ static int __init xen_guest_init(void)
 	disable_cpuidle();
 	disable_cpufreq();
 
+	xen_init_IRQ();
+
+	if (request_percpu_irq(xen_events_irq, xen_arm_callback,
+			       "events", &xen_vcpu)) {
+		pr_err("Error request IRQ %d\n", xen_events_irq);
+		return -EINVAL;
+	}
+
+	xen_percpu_init();
+
+	register_cpu_notifier(&xen_cpu_notifier);
+
 	return 0;
 }
-core_initcall(xen_guest_init);
+early_initcall(xen_guest_init);
 
 static int __init xen_pm_init(void)
 {
@@ -297,31 +339,6 @@ static int __init xen_pm_init(void)
 }
 late_initcall(xen_pm_init);
 
-static irqreturn_t xen_arm_callback(int irq, void *arg)
-{
-	xen_hvm_evtchn_do_upcall();
-	return IRQ_HANDLED;
-}
-
-static int __init xen_init_events(void)
-{
-	if (!xen_domain() || xen_events_irq < 0)
-		return -ENODEV;
-
-	xen_init_IRQ();
-
-	if (request_percpu_irq(xen_events_irq, xen_arm_callback,
-			"events", &xen_vcpu)) {
-		pr_err("Error requesting IRQ %d\n", xen_events_irq);
-		return -EINVAL;
-	}
-
-	on_each_cpu(xen_percpu_init, NULL, 0);
-
-	return 0;
-}
-postcore_initcall(xen_init_events);
-
 /* In the hypervisor.S file. */
 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);