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_cpu_ops, irq_enable_sysexit, "sti; sysexit");
 9DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
10DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
11DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
12DEF_NATIVE(pv_cpu_ops, clts, "clts");
13DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
 
 
 
14
15unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len)
16{
17	/* arg in %eax, return in %eax */
18	return 0;
19}
20
21unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
22{
23	/* arg in %edx:%eax, return in %edx:%eax */
24	return 0;
25}
26
 
 
 
27unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
28		      unsigned long addr, unsigned len)
29{
30	const unsigned char *start, *end;
31	unsigned ret;
32
33#define PATCH_SITE(ops, x)					\
34		case PARAVIRT_PATCH(ops.x):			\
35			start = start_##ops##_##x;		\
36			end = end_##ops##_##x;			\
37			goto patch_site
38	switch (type) {
39		PATCH_SITE(pv_irq_ops, irq_disable);
40		PATCH_SITE(pv_irq_ops, irq_enable);
41		PATCH_SITE(pv_irq_ops, restore_fl);
42		PATCH_SITE(pv_irq_ops, save_fl);
43		PATCH_SITE(pv_cpu_ops, iret);
44		PATCH_SITE(pv_cpu_ops, irq_enable_sysexit);
45		PATCH_SITE(pv_mmu_ops, read_cr2);
46		PATCH_SITE(pv_mmu_ops, read_cr3);
47		PATCH_SITE(pv_mmu_ops, write_cr3);
48		PATCH_SITE(pv_cpu_ops, clts);
49		PATCH_SITE(pv_cpu_ops, read_tsc);
50
51	patch_site:
52		ret = paravirt_patch_insns(ibuf, len, start, end);
53		break;
 
 
 
 
 
 
 
 
 
 
 
54
55	default:
 
56		ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
 
 
 
 
57		break;
58	}
59#undef PATCH_SITE
60	return ret;
61}

 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	/* arg in %eax, return in %eax */
20	return 0;
21}
22
23unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
24{
25	/* arg in %edx:%eax, return in %edx:%eax */
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}