1 #include <asm/paravirt.h>
2 #include <asm/asm-offsets.h>
3 #include <linux/stringify.h>
4
5 DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
6 DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
7 DEF_NATIVE(pv_irq_ops, restore_fl, "pushq %rdi; popfq");
8 DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
9 DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
10 DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
11 DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
12 DEF_NATIVE(pv_cpu_ops, clts, "clts");
13 DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
14
15 DEF_NATIVE(pv_cpu_ops, usergs_sysret64, "swapgs; sysretq");
16 DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
17
18 DEF_NATIVE(, mov32, "mov %edi, %eax");
19 DEF_NATIVE(, mov64, "mov %rdi, %rax");
20
21 #if defined(CONFIG_PARAVIRT_SPINLOCKS)
22 DEF_NATIVE(pv_lock_ops, queued_spin_unlock, "movb $0, (%rdi)");
23 #endif
24
paravirt_patch_ident_32(void * insnbuf,unsigned len)25 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
26 {
27 return paravirt_patch_insns(insnbuf, len,
28 start__mov32, end__mov32);
29 }
30
paravirt_patch_ident_64(void * insnbuf,unsigned len)31 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
32 {
33 return paravirt_patch_insns(insnbuf, len,
34 start__mov64, end__mov64);
35 }
36
37 extern bool pv_is_native_spin_unlock(void);
38
native_patch(u8 type,u16 clobbers,void * ibuf,unsigned long addr,unsigned len)39 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
40 unsigned long addr, unsigned len)
41 {
42 const unsigned char *start, *end;
43 unsigned ret;
44
45 #define PATCH_SITE(ops, x) \
46 case PARAVIRT_PATCH(ops.x): \
47 start = start_##ops##_##x; \
48 end = end_##ops##_##x; \
49 goto patch_site
50 switch(type) {
51 PATCH_SITE(pv_irq_ops, restore_fl);
52 PATCH_SITE(pv_irq_ops, save_fl);
53 PATCH_SITE(pv_irq_ops, irq_enable);
54 PATCH_SITE(pv_irq_ops, irq_disable);
55 PATCH_SITE(pv_cpu_ops, usergs_sysret64);
56 PATCH_SITE(pv_cpu_ops, swapgs);
57 PATCH_SITE(pv_mmu_ops, read_cr2);
58 PATCH_SITE(pv_mmu_ops, read_cr3);
59 PATCH_SITE(pv_mmu_ops, write_cr3);
60 PATCH_SITE(pv_cpu_ops, clts);
61 PATCH_SITE(pv_cpu_ops, wbinvd);
62 #if defined(CONFIG_PARAVIRT_SPINLOCKS)
63 case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
64 if (pv_is_native_spin_unlock()) {
65 start = start_pv_lock_ops_queued_spin_unlock;
66 end = end_pv_lock_ops_queued_spin_unlock;
67 goto patch_site;
68 }
69 #endif
70
71 default:
72 ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
73 break;
74
75 patch_site:
76 ret = paravirt_patch_insns(ibuf, len, start, end);
77 break;
78 }
79 #undef PATCH_SITE
80 return ret;
81 }
82