Merge tag 'stable/for-linus-3.9-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

Pull Xen bug-fixes from Konrad Rzeszutek Wilk:
 - Update the Xen ACPI memory and CPU hotplug locking mechanism.
 - Fix PAT issues wherein various applications would not start
 - Fix handling of multiple MSI as AHCI now does it.
 - Fix ARM compile failures.

* tag 'stable/for-linus-3.9-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xenbus: fix compile failure on ARM with Xen enabled
  xen/pci: We don't do multiple MSI's.
  xen/pat: Disable PAT using pat_enabled value.
  xen/acpi: xen cpu hotplug minor updates
  xen/acpi: xen memory hotplug minor updates

2 files changed, 18 insertions, 1 deletions

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 56ab74989cf1..94e76620460f 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -162,6 +162,9 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
         struct msi_desc *msidesc;
         int *v;
 
+        if (type == PCI_CAP_ID_MSI && nvec > 1)
+                return 1;
+
         v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
         if (!v)
                 return -ENOMEM;
@@ -220,6 +223,9 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
         struct msi_desc *msidesc;
         struct msi_msg msg;
 
+        if (type == PCI_CAP_ID_MSI && nvec > 1)
+                return 1;
+
         list_for_each_entry(msidesc, &dev->msi_list, list) {
                 __read_msi_msg(msidesc, &msg);
                 pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
@@ -263,6 +269,9 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
         int ret = 0;
         struct msi_desc *msidesc;
 
+        if (type == PCI_CAP_ID_MSI && nvec > 1)
+                return 1;
+
         list_for_each_entry(msidesc, &dev->msi_list, list) {
                 struct physdev_map_pirq map_irq;
                 domid_t domid;
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 39928d16be3b..c8e1c7b95c3b 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -67,6 +67,7 @@
 #include <asm/hypervisor.h>
 #include <asm/mwait.h>
 #include <asm/pci_x86.h>
+#include <asm/pat.h>
 
 #ifdef CONFIG_ACPI
 #include <linux/acpi.h>
@@ -1417,7 +1418,14 @@ asmlinkage void __init xen_start_kernel(void)
          */
         acpi_numa = -1;
 #endif
-
+#ifdef CONFIG_X86_PAT
+        /*
+         * For right now disable the PAT. We should remove this once
+         * git commit 8eaffa67b43e99ae581622c5133e20b0f48bcef1
+         * (xen/pat: Disable PAT support for now) is reverted.
+         */
+        pat_enabled = 0;
+#endif
         /* Don't do the full vcpu_info placement stuff until we have a
            possible map and a non-dummy shared_info. */
         per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];