[mirror_ubuntu-jammy-kernel.git] / arch / x86 / kernel / paravirt.c

/*  Paravirtualization interfaces
    Copyright (C) 2006 Rusty Russell IBM Corporation

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc
*/

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/efi.h>
#include <linux/bcd.h>
#include <linux/highmem.h>

#include <asm/bug.h>
#include <asm/paravirt.h>
#include <asm/desc.h>
#include <asm/setup.h>
#include <asm/arch_hooks.h>
#include <asm/pgtable.h>
#include <asm/time.h>
#include <asm/pgalloc.h>
#include <asm/irq.h>
#include <asm/delay.h>
#include <asm/fixmap.h>
#include <asm/apic.h>
#include <asm/tlbflush.h>
#include <asm/timer.h>

/* nop stub */
void _paravirt_nop(void)
{
}

/* identity function, which can be inlined */
u32 _paravirt_ident_32(u32 x)
{
	return x;
}

u64 _paravirt_ident_64(u64 x)
{
	return x;
}

static void __init default_banner(void)
{
	printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
	       pv_info.name);
}

char *memory_setup(void)
{
	return pv_init_ops.memory_setup();
}

/* Simple instruction patching code. */
#define DEF_NATIVE(ops, name, code)					\
	extern const char start_##ops##_##name[], end_##ops##_##name[];	\
	asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")

/* Undefined instruction for dealing with missing ops pointers. */
static const unsigned char ud2a[] = { 0x0f, 0x0b };

unsigned paravirt_patch_nop(void)
{
	return 0;
}

unsigned paravirt_patch_ignore(unsigned len)
{
	return len;
}

struct branch {
	unsigned char opcode;
	u32 delta;
} __attribute__((packed));

unsigned paravirt_patch_call(void *insnbuf,
			     const void *target, u16 tgt_clobbers,
			     unsigned long addr, u16 site_clobbers,
			     unsigned len)
{
	struct branch *b = insnbuf;
	unsigned long delta = (unsigned long)target - (addr+5);

	if (tgt_clobbers & ~site_clobbers)
		return len;	/* target would clobber too much for this site */
	if (len < 5)
		return len;	/* call too long for patch site */

	b->opcode = 0xe8; /* call */
	b->delta = delta;
	BUILD_BUG_ON(sizeof(*b) != 5);

	return 5;
}

unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
			    unsigned long addr, unsigned len)
{
	struct branch *b = insnbuf;
	unsigned long delta = (unsigned long)target - (addr+5);

	if (len < 5)
		return len;	/* call too long for patch site */

	b->opcode = 0xe9;	/* jmp */
	b->delta = delta;

	return 5;
}

/* Neat trick to map patch type back to the call within the
 * corresponding structure. */
static void *get_call_destination(u8 type)
{
	struct paravirt_patch_template tmpl = {
		.pv_init_ops = pv_init_ops,
		.pv_time_ops = pv_time_ops,
		.pv_cpu_ops = pv_cpu_ops,
		.pv_irq_ops = pv_irq_ops,
		.pv_apic_ops = pv_apic_ops,
		.pv_mmu_ops = pv_mmu_ops,
		.pv_lock_ops = pv_lock_ops,
	};
	return *((void **)&tmpl + type);
}

unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
				unsigned long addr, unsigned len)
{
	void *opfunc = get_call_destination(type);
	unsigned ret;

	if (opfunc == NULL)
		/* If there's no function, patch it with a ud2a (BUG) */
		ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a));
	else if (opfunc == _paravirt_nop)
		/* If the operation is a nop, then nop the callsite */
		ret = paravirt_patch_nop();

	/* identity functions just return their single argument */
	else if (opfunc == _paravirt_ident_32)
		ret = paravirt_patch_ident_32(insnbuf, len);
	else if (opfunc == _paravirt_ident_64)
		ret = paravirt_patch_ident_64(insnbuf, len);

	else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
		 type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) ||
		 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret32) ||
		 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret64))
		/* If operation requires a jmp, then jmp */
		ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
	else
		/* Otherwise call the function; assume target could
		   clobber any caller-save reg */
		ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY,
					  addr, clobbers, len);

	return ret;
}

unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
			      const char *start, const char *end)
{
	unsigned insn_len = end - start;

	if (insn_len > len || start == NULL)
		insn_len = len;
	else
		memcpy(insnbuf, start, insn_len);

	return insn_len;
}

void init_IRQ(void)
{
	pv_irq_ops.init_IRQ();
}

static void native_flush_tlb(void)
{
	__native_flush_tlb();
}

/*
 * Global pages have to be flushed a bit differently. Not a real
 * performance problem because this does not happen often.
 */
static void native_flush_tlb_global(void)
{
	__native_flush_tlb_global();
}

static void native_flush_tlb_single(unsigned long addr)
{
	__native_flush_tlb_single(addr);
}

/* These are in entry.S */
extern void native_iret(void);
extern void native_irq_enable_sysexit(void);
extern void native_usergs_sysret32(void);
extern void native_usergs_sysret64(void);

static int __init print_banner(void)
{
	pv_init_ops.banner();
	return 0;
}
core_initcall(print_banner);

static struct resource reserve_ioports = {
	.start = 0,
	.end = IO_SPACE_LIMIT,
	.name = "paravirt-ioport",
	.flags = IORESOURCE_IO | IORESOURCE_BUSY,
};

/*
 * Reserve the whole legacy IO space to prevent any legacy drivers
 * from wasting time probing for their hardware.  This is a fairly
 * brute-force approach to disabling all non-virtual drivers.
 *
 * Note that this must be called very early to have any effect.
 */
int paravirt_disable_iospace(void)
{
	return request_resource(&ioport_resource, &reserve_ioports);
}

static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;

static inline void enter_lazy(enum paravirt_lazy_mode mode)
{
	BUG_ON(__get_cpu_var(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
	BUG_ON(preemptible());

	__get_cpu_var(paravirt_lazy_mode) = mode;
}

void paravirt_leave_lazy(enum paravirt_lazy_mode mode)
{
	BUG_ON(__get_cpu_var(paravirt_lazy_mode) != mode);
	BUG_ON(preemptible());

	__get_cpu_var(paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
}

void paravirt_enter_lazy_mmu(void)
{
	enter_lazy(PARAVIRT_LAZY_MMU);
}

void paravirt_leave_lazy_mmu(void)
{
	paravirt_leave_lazy(PARAVIRT_LAZY_MMU);
}

void paravirt_enter_lazy_cpu(void)
{
	enter_lazy(PARAVIRT_LAZY_CPU);
}

void paravirt_leave_lazy_cpu(void)
{
	paravirt_leave_lazy(PARAVIRT_LAZY_CPU);
}

enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
{
	return __get_cpu_var(paravirt_lazy_mode);
}

struct pv_info pv_info = {
	.name = "bare hardware",
	.paravirt_enabled = 0,
	.kernel_rpl = 0,
	.shared_kernel_pmd = 1,	/* Only used when CONFIG_X86_PAE is set */
};

struct pv_init_ops pv_init_ops = {
	.patch = native_patch,
	.banner = default_banner,
	.arch_setup = paravirt_nop,
	.memory_setup = machine_specific_memory_setup,
};

struct pv_time_ops pv_time_ops = {
	.time_init = hpet_time_init,
	.get_wallclock = native_get_wallclock,
	.set_wallclock = native_set_wallclock,
	.sched_clock = native_sched_clock,
	.get_tsc_khz = native_calibrate_tsc,
};

struct pv_irq_ops pv_irq_ops = {
	.init_IRQ = native_init_IRQ,
	.save_fl = native_save_fl,
	.restore_fl = native_restore_fl,
	.irq_disable = native_irq_disable,
	.irq_enable = native_irq_enable,
	.safe_halt = native_safe_halt,
	.halt = native_halt,
#ifdef CONFIG_X86_64
	.adjust_exception_frame = paravirt_nop,
#endif
};

struct pv_cpu_ops pv_cpu_ops = {
	.cpuid = native_cpuid,
	.get_debugreg = native_get_debugreg,
	.set_debugreg = native_set_debugreg,
	.clts = native_clts,
	.read_cr0 = native_read_cr0,
	.write_cr0 = native_write_cr0,
	.read_cr4 = native_read_cr4,
	.read_cr4_safe = native_read_cr4_safe,
	.write_cr4 = native_write_cr4,
#ifdef CONFIG_X86_64
	.read_cr8 = native_read_cr8,
	.write_cr8 = native_write_cr8,
#endif
	.wbinvd = native_wbinvd,
	.read_msr = native_read_msr_safe,
	.read_msr_amd = native_read_msr_amd_safe,
	.write_msr = native_write_msr_safe,
	.read_tsc = native_read_tsc,
	.read_pmc = native_read_pmc,
	.read_tscp = native_read_tscp,
	.load_tr_desc = native_load_tr_desc,
	.set_ldt = native_set_ldt,
	.load_gdt = native_load_gdt,
	.load_idt = native_load_idt,
	.store_gdt = native_store_gdt,
	.store_idt = native_store_idt,
	.store_tr = native_store_tr,
	.load_tls = native_load_tls,
#ifdef CONFIG_X86_64
	.load_gs_index = native_load_gs_index,
#endif
	.write_ldt_entry = native_write_ldt_entry,
	.write_gdt_entry = native_write_gdt_entry,
	.write_idt_entry = native_write_idt_entry,

	.alloc_ldt = paravirt_nop,
	.free_ldt = paravirt_nop,

	.load_sp0 = native_load_sp0,

#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
	.irq_enable_sysexit = native_irq_enable_sysexit,
#endif
#ifdef CONFIG_X86_64
#ifdef CONFIG_IA32_EMULATION
	.usergs_sysret32 = native_usergs_sysret32,
#endif
	.usergs_sysret64 = native_usergs_sysret64,
#endif
	.iret = native_iret,
	.swapgs = native_swapgs,

	.set_iopl_mask = native_set_iopl_mask,
	.io_delay = native_io_delay,

	.lazy_mode = {
		.enter = paravirt_nop,
		.leave = paravirt_nop,
	},
};

struct pv_apic_ops pv_apic_ops = {
#ifdef CONFIG_X86_LOCAL_APIC
	.setup_boot_clock = setup_boot_APIC_clock,
	.setup_secondary_clock = setup_secondary_APIC_clock,
	.startup_ipi_hook = paravirt_nop,
#endif
};

typedef pte_t make_pte_t(pteval_t);
typedef pmd_t make_pmd_t(pmdval_t);
typedef pud_t make_pud_t(pudval_t);
typedef pgd_t make_pgd_t(pgdval_t);

typedef pteval_t pte_val_t(pte_t);
typedef pmdval_t pmd_val_t(pmd_t);
typedef pudval_t pud_val_t(pud_t);
typedef pgdval_t pgd_val_t(pgd_t);


#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
/* 32-bit pagetable entries */
#define paravirt_native_make_pte	(make_pte_t *)_paravirt_ident_32
#define paravirt_native_pte_val		(pte_val_t *)_paravirt_ident_32

#define paravirt_native_make_pmd	(make_pmd_t *)_paravirt_ident_32
#define paravirt_native_pmd_val		(pmd_val_t *)_paravirt_ident_32

#define paravirt_native_make_pud	(make_pud_t *)_paravirt_ident_32
#define paravirt_native_pud_val		(pud_val_t *)_paravirt_ident_32

#define paravirt_native_make_pgd	(make_pgd_t *)_paravirt_ident_32
#define paravirt_native_pgd_val		(pgd_val_t *)_paravirt_ident_32
#else
/* 64-bit pagetable entries */
#define paravirt_native_make_pte	(make_pte_t *)_paravirt_ident_64
#define paravirt_native_pte_val		(pte_val_t *)_paravirt_ident_64

#define paravirt_native_make_pmd	(make_pmd_t *)_paravirt_ident_64
#define paravirt_native_pmd_val		(pmd_val_t *)_paravirt_ident_64

#define paravirt_native_make_pud	(make_pud_t *)_paravirt_ident_64
#define paravirt_native_pud_val		(pud_val_t *)_paravirt_ident_64

#define paravirt_native_make_pgd	(make_pgd_t *)_paravirt_ident_64
#define paravirt_native_pgd_val		(pgd_val_t *)_paravirt_ident_64
#endif

struct pv_mmu_ops pv_mmu_ops = {
#ifndef CONFIG_X86_64
	.pagetable_setup_start = native_pagetable_setup_start,
	.pagetable_setup_done = native_pagetable_setup_done,
#else
	.pagetable_setup_start = paravirt_nop,
	.pagetable_setup_done = paravirt_nop,
#endif

	.read_cr2 = native_read_cr2,
	.write_cr2 = native_write_cr2,
	.read_cr3 = native_read_cr3,
	.write_cr3 = native_write_cr3,

	.flush_tlb_user = native_flush_tlb,
	.flush_tlb_kernel = native_flush_tlb_global,
	.flush_tlb_single = native_flush_tlb_single,
	.flush_tlb_others = native_flush_tlb_others,

	.pgd_alloc = __paravirt_pgd_alloc,
	.pgd_free = paravirt_nop,

	.alloc_pte = paravirt_nop,
	.alloc_pmd = paravirt_nop,
	.alloc_pmd_clone = paravirt_nop,
	.alloc_pud = paravirt_nop,
	.release_pte = paravirt_nop,
	.release_pmd = paravirt_nop,
	.release_pud = paravirt_nop,

	.set_pte = native_set_pte,
	.set_pte_at = native_set_pte_at,
	.set_pmd = native_set_pmd,
	.pte_update = paravirt_nop,
	.pte_update_defer = paravirt_nop,

	.ptep_modify_prot_start = __ptep_modify_prot_start,
	.ptep_modify_prot_commit = __ptep_modify_prot_commit,

#ifdef CONFIG_HIGHPTE
	.kmap_atomic_pte = kmap_atomic,
#endif

#if PAGETABLE_LEVELS >= 3
#ifdef CONFIG_X86_PAE
	.set_pte_atomic = native_set_pte_atomic,
	.set_pte_present = native_set_pte_present,
	.pte_clear = native_pte_clear,
	.pmd_clear = native_pmd_clear,
#endif
	.set_pud = native_set_pud,
	.pmd_val = paravirt_native_pmd_val,
	.make_pmd = paravirt_native_make_pmd,

#if PAGETABLE_LEVELS == 4
	.pud_val = paravirt_native_pud_val,
	.make_pud = paravirt_native_make_pud,
	.set_pgd = native_set_pgd,
#endif
#endif /* PAGETABLE_LEVELS >= 3 */

	.pte_val = paravirt_native_pte_val,
	.pgd_val = paravirt_native_pgd_val,

	.make_pte = paravirt_native_make_pte,
	.make_pgd = paravirt_native_make_pgd,

	.dup_mmap = paravirt_nop,
	.exit_mmap = paravirt_nop,
	.activate_mm = paravirt_nop,

	.lazy_mode = {
		.enter = paravirt_nop,
		.leave = paravirt_nop,
	},

	.set_fixmap = native_set_fixmap,
};

EXPORT_SYMBOL_GPL(pv_time_ops);
EXPORT_SYMBOL    (pv_cpu_ops);
EXPORT_SYMBOL    (pv_mmu_ops);
EXPORT_SYMBOL_GPL(pv_apic_ops);
EXPORT_SYMBOL_GPL(pv_info);
EXPORT_SYMBOL    (pv_irq_ops);
Commit	Line	Data
d3561b7f RR	1	/* Paravirtualization interfaces
	2	Copyright (C) 2006 Rusty Russell IBM Corporation
	3
	4	This program is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU General Public License as published by
	6	the Free Software Foundation; either version 2 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	GNU General Public License for more details.
	13
	14	You should have received a copy of the GNU General Public License
	15	along with this program; if not, write to the Free Software
	16	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
b1df07bd GOC	17
b1df07bd GOC	18	2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc
d3561b7f	19	*/
b1df07bd	20
d3561b7f RR	21	#include <linux/errno.h>
	22	#include <linux/module.h>
	23	#include <linux/efi.h>
	24	#include <linux/bcd.h>
ce6234b5	25	#include <linux/highmem.h>
d3561b7f RR	26
	27	#include <asm/bug.h>
	28	#include <asm/paravirt.h>
	29	#include <asm/desc.h>
	30	#include <asm/setup.h>
	31	#include <asm/arch_hooks.h>
a312b37b	32	#include <asm/pgtable.h>
d3561b7f	33	#include <asm/time.h>
eba0045f	34	#include <asm/pgalloc.h>
d3561b7f RR	35	#include <asm/irq.h>
d3561b7f RR	36	#include <asm/delay.h>
13623d79 RR	37	#include <asm/fixmap.h>
13623d79 RR	38	#include <asm/apic.h>
da181a8b	39	#include <asm/tlbflush.h>
6cb9a835	40	#include <asm/timer.h>
d3561b7f RR	41
d3561b7f RR	42	/* nop stub */
45876233	43	void _paravirt_nop(void)
d3561b7f RR	44	{
	45	}
	46
41edafdb JF	47	/* identity function, which can be inlined */
	48	u32 _paravirt_ident_32(u32 x)
	49	{
	50	return x;
	51	}
	52
	53	u64 _paravirt_ident_64(u64 x)
	54	{
	55	return x;
	56	}
	57
d3561b7f RR	58	static void __init default_banner(void)
	59	{
	60	printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
93b1eab3	61	pv_info.name);
d3561b7f RR	62	}
	63
	64	char *memory_setup(void)
	65	{
93b1eab3	66	return pv_init_ops.memory_setup();
d3561b7f RR	67	}
d3561b7f RR	68
139ec7c4	69	/* Simple instruction patching code. */
93b1eab3 JF	70	#define DEF_NATIVE(ops, name, code) \
	71	extern const char start_##ops##_##name[], end_##ops##_##name[]; \
	72	asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
	73
93b1eab3 JF	74	/* Undefined instruction for dealing with missing ops pointers. */
93b1eab3 JF	75	static const unsigned char ud2a[] = { 0x0f, 0x0b };
139ec7c4	76
63f70270 JF	77	unsigned paravirt_patch_nop(void)
	78	{
	79	return 0;
	80	}
	81
	82	unsigned paravirt_patch_ignore(unsigned len)
	83	{
	84	return len;
	85	}
	86
19d36ccd AK	87	struct branch {
	88	unsigned char opcode;
	89	u32 delta;
	90	} __attribute__((packed));
	91
ab144f5e AK	92	unsigned paravirt_patch_call(void *insnbuf,
	93	const void *target, u16 tgt_clobbers,
	94	unsigned long addr, u16 site_clobbers,
63f70270 JF	95	unsigned len)
63f70270 JF	96	{
ab144f5e AK	97	struct branch *b = insnbuf;
ab144f5e AK	98	unsigned long delta = (unsigned long)target - (addr+5);
63f70270 JF	99
	100	if (tgt_clobbers & ~site_clobbers)
	101	return len; /* target would clobber too much for this site */
	102	if (len < 5)
	103	return len; /* call too long for patch site */
139ec7c4	104
ab144f5e AK	105	b->opcode = 0xe8; /* call */
	106	b->delta = delta;
	107	BUILD_BUG_ON(sizeof(*b) != 5);
139ec7c4	108
63f70270 JF	109	return 5;
	110	}
	111
93b1eab3	112	unsigned paravirt_patch_jmp(void insnbuf, const void target,
ab144f5e	113	unsigned long addr, unsigned len)
63f70270	114	{
ab144f5e AK	115	struct branch *b = insnbuf;
ab144f5e AK	116	unsigned long delta = (unsigned long)target - (addr+5);
63f70270 JF	117
	118	if (len < 5)
	119	return len; /* call too long for patch site */
	120
ab144f5e AK	121	b->opcode = 0xe9; /* jmp */
ab144f5e AK	122	b->delta = delta;
63f70270 JF	123
	124	return 5;
	125	}
	126
93b1eab3 JF	127	/* Neat trick to map patch type back to the call within the
	128	* corresponding structure. */
	129	static void *get_call_destination(u8 type)
	130	{
	131	struct paravirt_patch_template tmpl = {
	132	.pv_init_ops = pv_init_ops,
93b1eab3 JF	133	.pv_time_ops = pv_time_ops,
	134	.pv_cpu_ops = pv_cpu_ops,
	135	.pv_irq_ops = pv_irq_ops,
	136	.pv_apic_ops = pv_apic_ops,
	137	.pv_mmu_ops = pv_mmu_ops,
74d4affd	138	.pv_lock_ops = pv_lock_ops,
93b1eab3 JF	139	};
	140	return ((void *)&tmpl + type);
	141	}
	142
ab144f5e AK	143	unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
ab144f5e AK	144	unsigned long addr, unsigned len)
63f70270	145	{
93b1eab3	146	void *opfunc = get_call_destination(type);
63f70270 JF	147	unsigned ret;
	148
	149	if (opfunc == NULL)
	150	/* If there's no function, patch it with a ud2a (BUG) */
93b1eab3	151	ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a));
41edafdb	152	else if (opfunc == _paravirt_nop)
63f70270 JF	153	/* If the operation is a nop, then nop the callsite */
63f70270 JF	154	ret = paravirt_patch_nop();
41edafdb JF	155
	156	/* identity functions just return their single argument */
	157	else if (opfunc == _paravirt_ident_32)
	158	ret = paravirt_patch_ident_32(insnbuf, len);
	159	else if (opfunc == _paravirt_ident_64)
	160	ret = paravirt_patch_ident_64(insnbuf, len);
	161
93b1eab3	162	else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) \|\|
d75cd22f	163	type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) \|\|
2be29982 JF	164	type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret32) \|\|
2be29982 JF	165	type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret64))
63f70270	166	/* If operation requires a jmp, then jmp */
93b1eab3	167	ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
63f70270 JF	168	else
	169	/* Otherwise call the function; assume target could
	170	clobber any caller-save reg */
ab144f5e AK	171	ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY,
ab144f5e AK	172	addr, clobbers, len);
63f70270 JF	173
	174	return ret;
	175	}
	176
ab144f5e	177	unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
63f70270 JF	178	const char start, const char end)
	179	{
	180	unsigned insn_len = end - start;
139ec7c4	181
63f70270 JF	182	if (insn_len > len \|\| start == NULL)
	183	insn_len = len;
	184	else
ab144f5e	185	memcpy(insnbuf, start, insn_len);
139ec7c4	186
139ec7c4 RR	187	return insn_len;
	188	}
	189
d3561b7f RR	190	void init_IRQ(void)
d3561b7f RR	191	{
93b1eab3	192	pv_irq_ops.init_IRQ();
d3561b7f RR	193	}
d3561b7f RR	194
1a1eecd1	195	static void native_flush_tlb(void)
da181a8b RR	196	{
	197	__native_flush_tlb();
	198	}
	199
	200	/*
	201	* Global pages have to be flushed a bit differently. Not a real
	202	* performance problem because this does not happen often.
	203	*/
1a1eecd1	204	static void native_flush_tlb_global(void)
da181a8b RR	205	{
	206	__native_flush_tlb_global();
	207	}
	208
63f70270	209	static void native_flush_tlb_single(unsigned long addr)
da181a8b RR	210	{
	211	__native_flush_tlb_single(addr);
	212	}
	213
d3561b7f	214	/* These are in entry.S */
1a1eecd1	215	extern void native_iret(void);
d75cd22f	216	extern void native_irq_enable_sysexit(void);
2be29982 JF	217	extern void native_usergs_sysret32(void);
2be29982 JF	218	extern void native_usergs_sysret64(void);
d3561b7f RR	219
	220	static int __init print_banner(void)
	221	{
93b1eab3	222	pv_init_ops.banner();
d3561b7f RR	223	return 0;
	224	}
	225	core_initcall(print_banner);
	226
d572929c JF	227	static struct resource reserve_ioports = {
	228	.start = 0,
	229	.end = IO_SPACE_LIMIT,
	230	.name = "paravirt-ioport",
	231	.flags = IORESOURCE_IO \| IORESOURCE_BUSY,
	232	};
	233
d572929c JF	234	/*
	235	* Reserve the whole legacy IO space to prevent any legacy drivers
	236	* from wasting time probing for their hardware. This is a fairly
	237	* brute-force approach to disabling all non-virtual drivers.
	238	*
	239	* Note that this must be called very early to have any effect.
	240	*/
	241	int paravirt_disable_iospace(void)
	242	{
f7743fe6	243	return request_resource(&ioport_resource, &reserve_ioports);
d572929c JF	244	}
d572929c JF	245
8965c1c0 JF	246	static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
	247
	248	static inline void enter_lazy(enum paravirt_lazy_mode mode)
	249	{
bfd074e0	250	BUG_ON(__get_cpu_var(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
8965c1c0 JF	251	BUG_ON(preemptible());
8965c1c0 JF	252
bfd074e0	253	__get_cpu_var(paravirt_lazy_mode) = mode;
8965c1c0 JF	254	}
	255
	256	void paravirt_leave_lazy(enum paravirt_lazy_mode mode)
	257	{
bfd074e0	258	BUG_ON(__get_cpu_var(paravirt_lazy_mode) != mode);
8965c1c0 JF	259	BUG_ON(preemptible());
8965c1c0 JF	260
bfd074e0	261	__get_cpu_var(paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
8965c1c0 JF	262	}
	263
	264	void paravirt_enter_lazy_mmu(void)
	265	{
	266	enter_lazy(PARAVIRT_LAZY_MMU);
	267	}
	268
	269	void paravirt_leave_lazy_mmu(void)
	270	{
	271	paravirt_leave_lazy(PARAVIRT_LAZY_MMU);
	272	}
	273
	274	void paravirt_enter_lazy_cpu(void)
	275	{
	276	enter_lazy(PARAVIRT_LAZY_CPU);
	277	}
	278
	279	void paravirt_leave_lazy_cpu(void)
	280	{
	281	paravirt_leave_lazy(PARAVIRT_LAZY_CPU);
	282	}
	283
	284	enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
	285	{
bfd074e0	286	return __get_cpu_var(paravirt_lazy_mode);
8965c1c0 JF	287	}
8965c1c0 JF	288
93b1eab3	289	struct pv_info pv_info = {
d3561b7f RR	290	.name = "bare hardware",
	291	.paravirt_enabled = 0,
	292	.kernel_rpl = 0,
5311ab62	293	.shared_kernel_pmd = 1, /* Only used when CONFIG_X86_PAE is set */
93b1eab3	294	};
d3561b7f	295
93b1eab3 JF	296	struct pv_init_ops pv_init_ops = {
93b1eab3 JF	297	.patch = native_patch,
d3561b7f	298	.banner = default_banner,
45876233	299	.arch_setup = paravirt_nop,
d3561b7f	300	.memory_setup = machine_specific_memory_setup,
93b1eab3 JF	301	};
	302
	303	struct pv_time_ops pv_time_ops = {
	304	.time_init = hpet_time_init,
d3561b7f RR	305	.get_wallclock = native_get_wallclock,
d3561b7f RR	306	.set_wallclock = native_set_wallclock,
93b1eab3	307	.sched_clock = native_sched_clock,
e93ef949	308	.get_tsc_khz = native_calibrate_tsc,
93b1eab3 JF	309	};
	310
	311	struct pv_irq_ops pv_irq_ops = {
d3561b7f	312	.init_IRQ = native_init_IRQ,
93b1eab3 JF	313	.save_fl = native_save_fl,
	314	.restore_fl = native_restore_fl,
	315	.irq_disable = native_irq_disable,
	316	.irq_enable = native_irq_enable,
	317	.safe_halt = native_safe_halt,
	318	.halt = native_halt,
fab58420 JF	319	#ifdef CONFIG_X86_64
	320	.adjust_exception_frame = paravirt_nop,
	321	#endif
93b1eab3	322	};
d3561b7f	323
93b1eab3	324	struct pv_cpu_ops pv_cpu_ops = {
d3561b7f RR	325	.cpuid = native_cpuid,
	326	.get_debugreg = native_get_debugreg,
	327	.set_debugreg = native_set_debugreg,
	328	.clts = native_clts,
	329	.read_cr0 = native_read_cr0,
	330	.write_cr0 = native_write_cr0,
d3561b7f RR	331	.read_cr4 = native_read_cr4,
	332	.read_cr4_safe = native_read_cr4_safe,
	333	.write_cr4 = native_write_cr4,
88b4755f GOC	334	#ifdef CONFIG_X86_64
	335	.read_cr8 = native_read_cr8,
	336	.write_cr8 = native_write_cr8,
	337	#endif
d3561b7f	338	.wbinvd = native_wbinvd,
90a0a06a	339	.read_msr = native_read_msr_safe,
b05f78f5	340	.read_msr_amd = native_read_msr_amd_safe,
90a0a06a	341	.write_msr = native_write_msr_safe,
d3561b7f RR	342	.read_tsc = native_read_tsc,
d3561b7f RR	343	.read_pmc = native_read_pmc,
e5aaac44	344	.read_tscp = native_read_tscp,
d3561b7f RR	345	.load_tr_desc = native_load_tr_desc,
	346	.set_ldt = native_set_ldt,
	347	.load_gdt = native_load_gdt,
	348	.load_idt = native_load_idt,
	349	.store_gdt = native_store_gdt,
	350	.store_idt = native_store_idt,
	351	.store_tr = native_store_tr,
	352	.load_tls = native_load_tls,
9f9d489a JF	353	#ifdef CONFIG_X86_64
	354	.load_gs_index = native_load_gs_index,
	355	#endif
75b8bb3e	356	.write_ldt_entry = native_write_ldt_entry,
014b15be	357	.write_gdt_entry = native_write_gdt_entry,
8d947344	358	.write_idt_entry = native_write_idt_entry,
38ffbe66 JF	359
	360	.alloc_ldt = paravirt_nop,
	361	.free_ldt = paravirt_nop,
	362
faca6227	363	.load_sp0 = native_load_sp0,
d3561b7f	364
102d0a4b	365	#if defined(CONFIG_X86_32) \|\| defined(CONFIG_IA32_EMULATION)
d75cd22f	366	.irq_enable_sysexit = native_irq_enable_sysexit,
102d0a4b	367	#endif
2be29982	368	#ifdef CONFIG_X86_64
102d0a4b	369	#ifdef CONFIG_IA32_EMULATION
2be29982	370	.usergs_sysret32 = native_usergs_sysret32,
102d0a4b	371	#endif
2be29982	372	.usergs_sysret64 = native_usergs_sysret64,
d75cd22f	373	#endif
93b1eab3	374	.iret = native_iret,
e801f864	375	.swapgs = native_swapgs,
93b1eab3	376
d3561b7f RR	377	.set_iopl_mask = native_set_iopl_mask,
d3561b7f RR	378	.io_delay = native_io_delay,
8965c1c0 JF	379
	380	.lazy_mode = {
	381	.enter = paravirt_nop,
	382	.leave = paravirt_nop,
	383	},
93b1eab3	384	};
d3561b7f	385
93b1eab3	386	struct pv_apic_ops pv_apic_ops = {
13623d79	387	#ifdef CONFIG_X86_LOCAL_APIC
bbab4f3b ZA	388	.setup_boot_clock = setup_boot_APIC_clock,
bbab4f3b ZA	389	.setup_secondary_clock = setup_secondary_APIC_clock,
0260c196	390	.startup_ipi_hook = paravirt_nop,
13623d79	391	#endif
93b1eab3 JF	392	};
93b1eab3 JF	393
41edafdb JF	394	typedef pte_t make_pte_t(pteval_t);
	395	typedef pmd_t make_pmd_t(pmdval_t);
	396	typedef pud_t make_pud_t(pudval_t);
	397	typedef pgd_t make_pgd_t(pgdval_t);
	398
	399	typedef pteval_t pte_val_t(pte_t);
	400	typedef pmdval_t pmd_val_t(pmd_t);
	401	typedef pudval_t pud_val_t(pud_t);
	402	typedef pgdval_t pgd_val_t(pgd_t);
	403
	404
	405	#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
	406	/* 32-bit pagetable entries */
	407	#define paravirt_native_make_pte (make_pte_t *)_paravirt_ident_32
	408	#define paravirt_native_pte_val (pte_val_t *)_paravirt_ident_32
	409
	410	#define paravirt_native_make_pmd (make_pmd_t *)_paravirt_ident_32
	411	#define paravirt_native_pmd_val (pmd_val_t *)_paravirt_ident_32
	412
	413	#define paravirt_native_make_pud (make_pud_t *)_paravirt_ident_32
	414	#define paravirt_native_pud_val (pud_val_t *)_paravirt_ident_32
	415
	416	#define paravirt_native_make_pgd (make_pgd_t *)_paravirt_ident_32
	417	#define paravirt_native_pgd_val (pgd_val_t *)_paravirt_ident_32
	418	#else
	419	/* 64-bit pagetable entries */
	420	#define paravirt_native_make_pte (make_pte_t *)_paravirt_ident_64
	421	#define paravirt_native_pte_val (pte_val_t *)_paravirt_ident_64
	422
	423	#define paravirt_native_make_pmd (make_pmd_t *)_paravirt_ident_64
	424	#define paravirt_native_pmd_val (pmd_val_t *)_paravirt_ident_64
	425
	426	#define paravirt_native_make_pud (make_pud_t *)_paravirt_ident_64
	427	#define paravirt_native_pud_val (pud_val_t *)_paravirt_ident_64
	428
	429	#define paravirt_native_make_pgd (make_pgd_t *)_paravirt_ident_64
	430	#define paravirt_native_pgd_val (pgd_val_t *)_paravirt_ident_64
	431	#endif
	432
93b1eab3	433	struct pv_mmu_ops pv_mmu_ops = {
d8dd8eec	434	#ifndef CONFIG_X86_64
b239fb25 JF	435	.pagetable_setup_start = native_pagetable_setup_start,
b239fb25 JF	436	.pagetable_setup_done = native_pagetable_setup_done,
a312b37b EH	437	#else
	438	.pagetable_setup_start = paravirt_nop,
	439	.pagetable_setup_done = paravirt_nop,
d8dd8eec	440	#endif
b239fb25	441
93b1eab3 JF	442	.read_cr2 = native_read_cr2,
	443	.write_cr2 = native_write_cr2,
	444	.read_cr3 = native_read_cr3,
	445	.write_cr3 = native_write_cr3,
	446
da181a8b RR	447	.flush_tlb_user = native_flush_tlb,
	448	.flush_tlb_kernel = native_flush_tlb_global,
	449	.flush_tlb_single = native_flush_tlb_single,
d4c10477	450	.flush_tlb_others = native_flush_tlb_others,
da181a8b	451
eba0045f JF	452	.pgd_alloc = __paravirt_pgd_alloc,
	453	.pgd_free = paravirt_nop,
	454
6944a9c8 JF	455	.alloc_pte = paravirt_nop,
	456	.alloc_pmd = paravirt_nop,
	457	.alloc_pmd_clone = paravirt_nop,
2761fa09	458	.alloc_pud = paravirt_nop,
6944a9c8 JF	459	.release_pte = paravirt_nop,
6944a9c8 JF	460	.release_pmd = paravirt_nop,
2761fa09	461	.release_pud = paravirt_nop,
c119ecce	462
da181a8b RR	463	.set_pte = native_set_pte,
	464	.set_pte_at = native_set_pte_at,
	465	.set_pmd = native_set_pmd,
45876233 JF	466	.pte_update = paravirt_nop,
45876233 JF	467	.pte_update_defer = paravirt_nop,
3dc494e8	468
08b882c6 JF	469	.ptep_modify_prot_start = __ptep_modify_prot_start,
	470	.ptep_modify_prot_commit = __ptep_modify_prot_commit,
	471
ce6234b5 JF	472	#ifdef CONFIG_HIGHPTE
	473	.kmap_atomic_pte = kmap_atomic,
	474	#endif
	475
f95f2f7b	476	#if PAGETABLE_LEVELS >= 3
da181a8b RR	477	#ifdef CONFIG_X86_PAE
	478	.set_pte_atomic = native_set_pte_atomic,
	479	.set_pte_present = native_set_pte_present,
da181a8b RR	480	.pte_clear = native_pte_clear,
da181a8b RR	481	.pmd_clear = native_pmd_clear,
f95f2f7b EH	482	#endif
f95f2f7b EH	483	.set_pud = native_set_pud,
41edafdb JF	484	.pmd_val = paravirt_native_pmd_val,
41edafdb JF	485	.make_pmd = paravirt_native_make_pmd,
f95f2f7b EH	486
f95f2f7b EH	487	#if PAGETABLE_LEVELS == 4
41edafdb JF	488	.pud_val = paravirt_native_pud_val,
41edafdb JF	489	.make_pud = paravirt_native_make_pud,
f95f2f7b	490	.set_pgd = native_set_pgd,
da181a8b	491	#endif
f95f2f7b	492	#endif /* PAGETABLE_LEVELS >= 3 */
da181a8b	493
41edafdb JF	494	.pte_val = paravirt_native_pte_val,
41edafdb JF	495	.pgd_val = paravirt_native_pgd_val,
3dc494e8	496
41edafdb JF	497	.make_pte = paravirt_native_make_pte,
41edafdb JF	498	.make_pgd = paravirt_native_make_pgd,
3dc494e8	499
d6dd61c8 JF	500	.dup_mmap = paravirt_nop,
	501	.exit_mmap = paravirt_nop,
	502	.activate_mm = paravirt_nop,
8965c1c0 JF	503
	504	.lazy_mode = {
	505	.enter = paravirt_nop,
	506	.leave = paravirt_nop,
	507	},
aeaaa59c JF	508
aeaaa59c JF	509	.set_fixmap = native_set_fixmap,
d3561b7f	510	};
0dbe5a11	511
93b1eab3	512	EXPORT_SYMBOL_GPL(pv_time_ops);
f97b8954 JF	513	EXPORT_SYMBOL (pv_cpu_ops);
f97b8954 JF	514	EXPORT_SYMBOL (pv_mmu_ops);
93b1eab3 JF	515	EXPORT_SYMBOL_GPL(pv_apic_ops);
	516	EXPORT_SYMBOL_GPL(pv_info);
	517	EXPORT_SYMBOL (pv_irq_ops);