KVM: PPC: Avoid patching paravirt template code
Currently we patch the whole code include paravirt template code.
This isn't safe for scratch area and has impact to performance.
Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 04d4b5a..62bdf23 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -665,6 +665,9 @@
}
}
+extern u32 kvm_template_start[];
+extern u32 kvm_template_end[];
+
static void kvm_use_magic_page(void)
{
u32 *p;
@@ -692,8 +695,14 @@
*/
local_irq_disable();
- for (p = start; p < end; p++)
+ for (p = start; p < end; p++) {
+ /* Avoid patching the template code */
+ if (p >= kvm_template_start && p < kvm_template_end) {
+ p = kvm_template_end - 1;
+ continue;
+ }
kvm_check_ins(p, features);
+ }
local_irq_enable();