1 files changed, 49 insertions, 0 deletions

diff --git a/arch/x86/kernel/paravirt_patch_32.c b/arch/x86/kernel/paravirt_patch_32.c
new file mode 100644
index 00000000000..82fc5fcab4f
--- /dev/null
+++ b/arch/x86/kernel/paravirt_patch_32.c
@@ -0,0 +1,49 @@
+#include <asm/paravirt.h>
+
+DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
+DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
+DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
+DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
+DEF_NATIVE(pv_cpu_ops, iret, "iret");
+DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "sti; sysexit");
+DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
+DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
+DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
+DEF_NATIVE(pv_cpu_ops, clts, "clts");
+DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
+
+unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
+                      unsigned long addr, unsigned len)
+{
+        const unsigned char *start, *end;
+        unsigned ret;
+
+#define PATCH_SITE(ops, x)                                      \
+                case PARAVIRT_PATCH(ops.x):                     \
+                        start = start_##ops##_##x;              \
+                        end = end_##ops##_##x;                  \
+                        goto patch_site
+        switch(type) {
+                PATCH_SITE(pv_irq_ops, irq_disable);
+                PATCH_SITE(pv_irq_ops, irq_enable);
+                PATCH_SITE(pv_irq_ops, restore_fl);
+                PATCH_SITE(pv_irq_ops, save_fl);
+                PATCH_SITE(pv_cpu_ops, iret);
+                PATCH_SITE(pv_cpu_ops, irq_enable_syscall_ret);
+                PATCH_SITE(pv_mmu_ops, read_cr2);
+                PATCH_SITE(pv_mmu_ops, read_cr3);
+                PATCH_SITE(pv_mmu_ops, write_cr3);
+                PATCH_SITE(pv_cpu_ops, clts);
+                PATCH_SITE(pv_cpu_ops, read_tsc);
+
+        patch_site:
+                ret = paravirt_patch_insns(ibuf, len, start, end);
+                break;
+
+        default:
+                ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
+                break;
+        }
+#undef PATCH_SITE
+        return ret;
+}