Merge branch 'stable/xen-swiotlb-0.8.6' of git://git.kernel.org/pub/scm/linux/kernel...

[pandora-kernel.git] / arch / x86 / xen / mmu.c

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index ef5728d..42086ac 100644 (file)
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -62,6 +62,7 @@
 #include <xen/xen.h>
 #include <xen/page.h>
 #include <xen/interface/xen.h>
+#include <xen/interface/hvm/hvm_op.h>
 #include <xen/interface/version.h>
 #include <xen/interface/memory.h>
 #include <xen/hvc-console.h>
@@ -2224,6 +2225,40 @@ void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order)
 }
 EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
 
+#ifdef CONFIG_XEN_PVHVM
+static void xen_hvm_exit_mmap(struct mm_struct *mm)
+{
+       struct xen_hvm_pagetable_dying a;
+       int rc;
+
+       a.domid = DOMID_SELF;
+       a.gpa = __pa(mm->pgd);
+       rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
+       WARN_ON_ONCE(rc < 0);
+}
+
+static int is_pagetable_dying_supported(void)
+{
+       struct xen_hvm_pagetable_dying a;
+       int rc = 0;
+
+       a.domid = DOMID_SELF;
+       a.gpa = 0x00;
+       rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
+       if (rc < 0) {
+               printk(KERN_DEBUG "HVMOP_pagetable_dying not supported\n");
+               return 0;
+       }
+       return 1;
+}
+
+void __init xen_hvm_init_mmu_ops(void)
+{
+       if (is_pagetable_dying_supported())
+               pv_mmu_ops.exit_mmap = xen_hvm_exit_mmap;
+}
+#endif
+
 #ifdef CONFIG_XEN_DEBUG_FS
 
 static struct dentry *d_mmu_debug;