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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2010-06-17 14:22:52 +0100
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-07-26 23:13:26 -0700
commit5915100106b8f14a38053ad6c03a664d208aeaa2 (patch)
tree86117ec2860f0a1d1f16fd778ab2e53722871d33 /arch/x86/xen/mmu.c
parentc1c5413ad58cb73267d328e6020268aa2e50d8ca (diff)
downloadlinux-linaro-android-5915100106b8f14a38053ad6c03a664d208aeaa2.tar.gz
x86: Call HVMOP_pagetable_dying on exit_mmap.
When a pagetable is about to be destroyed, we notify Xen so that the hypervisor can clear the related shadow pagetable. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86/xen/mmu.c')
-rw-r--r--arch/x86/xen/mmu.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 914f04695ce..84648c1bf13 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -58,6 +58,7 @@
#include <xen/page.h>
#include <xen/interface/xen.h>
+#include <xen/interface/hvm/hvm_op.h>
#include <xen/interface/version.h>
#include <xen/hvc-console.h>
@@ -1941,6 +1942,38 @@ void __init xen_init_mmu_ops(void)
pv_mmu_ops = xen_mmu_ops;
}
+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;
+}
+
#ifdef CONFIG_XEN_DEBUG_FS
static struct dentry *d_mmu_debug;