1#include <asm/paravirt.h>
2
3DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
4DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
5DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
6DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
7DEF_NATIVE(pv_cpu_ops, iret, "iret");
8DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
9DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
10DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
11
12#if defined(CONFIG_PARAVIRT_SPINLOCKS)
13DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%eax)");
14DEF_NATIVE(pv_lock_ops, vcpu_is_preempted, "xor %eax, %eax");
15#endif
16
17unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
18{
19
20 return 0;
21}
22
23unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
24{
25
26 return 0;
27}
28
29extern bool pv_is_native_spin_unlock(void);
30extern bool pv_is_native_vcpu_is_preempted(void);
31
32unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
33 unsigned long addr, unsigned len)
34{
35 const unsigned char *start, *end;
36 unsigned ret;
37
38#define PATCH_SITE(ops, x) \
39 case PARAVIRT_PATCH(ops.x): \
40 start = start_##ops##_##x; \
41 end = end_##ops##_##x; \
42 goto patch_site
43 switch (type) {
44 PATCH_SITE(pv_irq_ops, irq_disable);
45 PATCH_SITE(pv_irq_ops, irq_enable);
46 PATCH_SITE(pv_irq_ops, restore_fl);
47 PATCH_SITE(pv_irq_ops, save_fl);
48 PATCH_SITE(pv_cpu_ops, iret);
49 PATCH_SITE(pv_mmu_ops, read_cr2);
50 PATCH_SITE(pv_mmu_ops, read_cr3);
51 PATCH_SITE(pv_mmu_ops, write_cr3);
52#if defined(CONFIG_PARAVIRT_SPINLOCKS)
53 case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
54 if (pv_is_native_spin_unlock()) {
55 start = start_pv_lock_ops_queued_spin_unlock;
56 end = end_pv_lock_ops_queued_spin_unlock;
57 goto patch_site;
58 }
59 goto patch_default;
60
61 case PARAVIRT_PATCH(pv_lock_ops.vcpu_is_preempted):
62 if (pv_is_native_vcpu_is_preempted()) {
63 start = start_pv_lock_ops_vcpu_is_preempted;
64 end = end_pv_lock_ops_vcpu_is_preempted;
65 goto patch_site;
66 }
67 goto patch_default;
68#endif
69
70 default:
71patch_default: __maybe_unused
72 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
73 break;
74
75patch_site:
76 ret = paravirt_patch_insns(ibuf, len, start, end);
77 break;
78 }
79#undef PATCH_SITE
80 return ret;
81}
82