Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus

* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  lguest: fix for CONFIG_SPARSE_IRQ=y
  lguest: fix crash 'unhandled trap 13 at <native_read_msr_safe>'

2 files changed, 20 insertions, 7 deletions

diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 92f1c6f3e19d..960a8d9c049c 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -343,6 +343,11 @@ static void lguest_cpuid(unsigned int *ax, unsigned int *bx,
                  * flush_tlb_user() for both user and kernel mappings unless
                  * the Page Global Enable (PGE) feature bit is set. */
                 *dx |= 0x00002000;
+                /* We also lie, and say we're family id 5.  6 or greater
+                 * leads to a rdmsr in early_init_intel which we can't handle.
+                 * Family ID is returned as bits 8-12 in ax. */
+                *ax &= 0xFFFFF0FF;
+                *ax |= 0x00000500;
                 break;
         case 0x80000000:
                 /* Futureproof this a little: if they ask how much extended
@@ -589,19 +594,21 @@ static void __init lguest_init_IRQ(void)
                 /* Some systems map "vectors" to interrupts weirdly.  Lguest has
                  * a straightforward 1 to 1 mapping, so force that here. */
                 __get_cpu_var(vector_irq)[vector] = i;
-                if (vector != SYSCALL_VECTOR) {
-                        set_intr_gate(vector,
-                                      interrupt[vector-FIRST_EXTERNAL_VECTOR]);
-                        set_irq_chip_and_handler_name(i, &lguest_irq_controller,
-                                                      handle_level_irq,
-                                                      "level");
-                }
+                if (vector != SYSCALL_VECTOR)
+                        set_intr_gate(vector, interrupt[i]);
         }
         /* This call is required to set up for 4k stacks, where we have
          * separate stacks for hard and soft interrupts. */
         irq_ctx_init(smp_processor_id());
 }
 
+void lguest_setup_irq(unsigned int irq)
+{
+        irq_to_desc_alloc_cpu(irq, 0);
+        set_irq_chip_and_handler_name(irq, &lguest_irq_controller,
+                                      handle_level_irq, "level");
+}
+
 /*
  * Time.
  *
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index b4d44e571d76..8132533d71f9 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -212,6 +212,9 @@ static void lg_notify(struct virtqueue *vq)
         hcall(LHCALL_NOTIFY, lvq->config.pfn << PAGE_SHIFT, 0, 0);
 }
 
+/* An extern declaration inside a C file is bad form.  Don't do it. */
+extern void lguest_setup_irq(unsigned int irq);
+
 /* This routine finds the first virtqueue described in the configuration of
  * this device and sets it up.
  *
@@ -266,6 +269,9 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
                 goto unmap;
         }
 
+        /* Make sure the interrupt is allocated. */
+        lguest_setup_irq(lvq->config.irq);
+
         /* Tell the interrupt for this virtqueue to go to the virtio_ring
          * interrupt handler. */
         /* FIXME: We used to have a flag for the Host to tell us we could use