Contributors: 21
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jeremy Fitzhardinge |
676 |
38.96% |
28 |
32.56% |
| Juergen Gross |
407 |
23.46% |
11 |
12.79% |
| Rusty Russell |
266 |
15.33% |
5 |
5.81% |
| Andi Kleen |
79 |
4.55% |
3 |
3.49% |
| Peter Zijlstra |
54 |
3.11% |
3 |
3.49% |
| Kirill A. Shutemov |
40 |
2.31% |
3 |
3.49% |
| Ingo Molnar |
35 |
2.02% |
4 |
4.65% |
| Andrew Lutomirski |
35 |
2.02% |
6 |
6.98% |
| Glauber de Oliveira Costa |
33 |
1.90% |
6 |
6.98% |
| Boris Ostrovsky |
33 |
1.90% |
1 |
1.16% |
| Eduardo Pereira Habkost |
29 |
1.67% |
2 |
2.33% |
| Zachary Amsden |
15 |
0.86% |
2 |
2.33% |
| Alex Shi |
6 |
0.35% |
1 |
1.16% |
| Mike Rapoport |
6 |
0.35% |
1 |
1.16% |
| Paul Gortmaker |
6 |
0.35% |
2 |
2.33% |
| Masami Hiramatsu |
3 |
0.17% |
1 |
1.16% |
| Thomas Gleixner |
3 |
0.17% |
2 |
2.33% |
| David Howells |
3 |
0.17% |
1 |
1.16% |
| H. Peter Anvin |
2 |
0.12% |
1 |
1.16% |
| Borislav Petkov |
2 |
0.12% |
2 |
2.33% |
| Dan Carpenter |
2 |
0.12% |
1 |
1.16% |
| Total |
1735 |
|
86 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/* Paravirtualization interfaces
Copyright (C) 2006 Rusty Russell IBM Corporation
2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/efi.h>
#include <linux/bcd.h>
#include <linux/highmem.h>
#include <linux/kprobes.h>
#include <linux/pgtable.h>
#include <asm/bug.h>
#include <asm/paravirt.h>
#include <asm/debugreg.h>
#include <asm/desc.h>
#include <asm/setup.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>
#include <asm/special_insns.h>
#include <asm/tlb.h>
#include <asm/io_bitmap.h>
/*
* nop stub, which must not clobber anything *including the stack* to
* avoid confusing the entry prologues.
*/
extern void _paravirt_nop(void);
asm (".pushsection .entry.text, \"ax\"\n"
".global _paravirt_nop\n"
"_paravirt_nop:\n\t"
"ret\n\t"
".size _paravirt_nop, . - _paravirt_nop\n\t"
".type _paravirt_nop, @function\n\t"
".popsection");
void __init default_banner(void)
{
printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
pv_info.name);
}
/* Undefined instruction for dealing with missing ops pointers. */
static const unsigned char ud2a[] = { 0x0f, 0x0b };
struct branch {
unsigned char opcode;
u32 delta;
} __attribute__((packed));
static unsigned paravirt_patch_call(void *insn_buff, const void *target,
unsigned long addr, unsigned len)
{
const int call_len = 5;
struct branch *b = insn_buff;
unsigned long delta = (unsigned long)target - (addr+call_len);
if (len < call_len) {
pr_warn("paravirt: Failed to patch indirect CALL at %ps\n", (void *)addr);
/* Kernel might not be viable if patching fails, bail out: */
BUG_ON(1);
}
b->opcode = 0xe8; /* call */
b->delta = delta;
BUILD_BUG_ON(sizeof(*b) != call_len);
return call_len;
}
#ifdef CONFIG_PARAVIRT_XXL
/* identity function, which can be inlined */
u64 notrace _paravirt_ident_64(u64 x)
{
return x;
}
static unsigned paravirt_patch_jmp(void *insn_buff, const void *target,
unsigned long addr, unsigned len)
{
struct branch *b = insn_buff;
unsigned long delta = (unsigned long)target - (addr+5);
if (len < 5) {
#ifdef CONFIG_RETPOLINE
WARN_ONCE(1, "Failing to patch indirect JMP in %ps\n", (void *)addr);
#endif
return len; /* call too long for patch site */
}
b->opcode = 0xe9; /* jmp */
b->delta = delta;
return 5;
}
#endif
DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key);
void __init native_pv_lock_init(void)
{
if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
static_branch_disable(&virt_spin_lock_key);
}
unsigned paravirt_patch_default(u8 type, void *insn_buff,
unsigned long addr, unsigned len)
{
/*
* Neat trick to map patch type back to the call within the
* corresponding structure.
*/
void *opfunc = *((void **)&pv_ops + type);
unsigned ret;
if (opfunc == NULL)
/* If there's no function, patch it with a ud2a (BUG) */
ret = paravirt_patch_insns(insn_buff, len, ud2a, ud2a+sizeof(ud2a));
else if (opfunc == _paravirt_nop)
ret = 0;
#ifdef CONFIG_PARAVIRT_XXL
/* identity functions just return their single argument */
else if (opfunc == _paravirt_ident_64)
ret = paravirt_patch_ident_64(insn_buff, len);
else if (type == PARAVIRT_PATCH(cpu.iret) ||
type == PARAVIRT_PATCH(cpu.usergs_sysret64))
/* If operation requires a jmp, then jmp */
ret = paravirt_patch_jmp(insn_buff, opfunc, addr, len);
#endif
else
/* Otherwise call the function. */
ret = paravirt_patch_call(insn_buff, opfunc, addr, len);
return ret;
}
unsigned paravirt_patch_insns(void *insn_buff, unsigned len,
const char *start, const char *end)
{
unsigned insn_len = end - start;
/* Alternative instruction is too large for the patch site and we cannot continue: */
BUG_ON(insn_len > len || start == NULL);
memcpy(insn_buff, start, insn_len);
return insn_len;
}
struct static_key paravirt_steal_enabled;
struct static_key paravirt_steal_rq_enabled;
static u64 native_steal_clock(int cpu)
{
return 0;
}
/* These are in entry.S */
extern void native_iret(void);
extern void native_usergs_sysret64(void);
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(this_cpu_read(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
this_cpu_write(paravirt_lazy_mode, mode);
}
static void leave_lazy(enum paravirt_lazy_mode mode)
{
BUG_ON(this_cpu_read(paravirt_lazy_mode) != mode);
this_cpu_write(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
}
void paravirt_enter_lazy_mmu(void)
{
enter_lazy(PARAVIRT_LAZY_MMU);
}
void paravirt_leave_lazy_mmu(void)
{
leave_lazy(PARAVIRT_LAZY_MMU);
}
void paravirt_flush_lazy_mmu(void)
{
preempt_disable();
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
arch_leave_lazy_mmu_mode();
arch_enter_lazy_mmu_mode();
}
preempt_enable();
}
#ifdef CONFIG_PARAVIRT_XXL
void paravirt_start_context_switch(struct task_struct *prev)
{
BUG_ON(preemptible());
if (this_cpu_read(paravirt_lazy_mode) == PARAVIRT_LAZY_MMU) {
arch_leave_lazy_mmu_mode();
set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES);
}
enter_lazy(PARAVIRT_LAZY_CPU);
}
void paravirt_end_context_switch(struct task_struct *next)
{
BUG_ON(preemptible());
leave_lazy(PARAVIRT_LAZY_CPU);
if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
arch_enter_lazy_mmu_mode();
}
#endif
enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
{
if (in_interrupt())
return PARAVIRT_LAZY_NONE;
return this_cpu_read(paravirt_lazy_mode);
}
struct pv_info pv_info = {
.name = "bare hardware",
#ifdef CONFIG_PARAVIRT_XXL
.kernel_rpl = 0,
.shared_kernel_pmd = 1, /* Only used when CONFIG_X86_PAE is set */
#ifdef CONFIG_X86_64
.extra_user_64bit_cs = __USER_CS,
#endif
#endif
};
/* 64-bit pagetable entries */
#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64)
struct paravirt_patch_template pv_ops = {
/* Init ops. */
.init.patch = native_patch,
/* Time ops. */
.time.sched_clock = native_sched_clock,
.time.steal_clock = native_steal_clock,
/* Cpu ops. */
.cpu.io_delay = native_io_delay,
#ifdef CONFIG_PARAVIRT_XXL
.cpu.cpuid = native_cpuid,
.cpu.get_debugreg = native_get_debugreg,
.cpu.set_debugreg = native_set_debugreg,
.cpu.read_cr0 = native_read_cr0,
.cpu.write_cr0 = native_write_cr0,
.cpu.write_cr4 = native_write_cr4,
.cpu.wbinvd = native_wbinvd,
.cpu.read_msr = native_read_msr,
.cpu.write_msr = native_write_msr,
.cpu.read_msr_safe = native_read_msr_safe,
.cpu.write_msr_safe = native_write_msr_safe,
.cpu.read_pmc = native_read_pmc,
.cpu.load_tr_desc = native_load_tr_desc,
.cpu.set_ldt = native_set_ldt,
.cpu.load_gdt = native_load_gdt,
.cpu.load_idt = native_load_idt,
.cpu.store_tr = native_store_tr,
.cpu.load_tls = native_load_tls,
#ifdef CONFIG_X86_64
.cpu.load_gs_index = native_load_gs_index,
#endif
.cpu.write_ldt_entry = native_write_ldt_entry,
.cpu.write_gdt_entry = native_write_gdt_entry,
.cpu.write_idt_entry = native_write_idt_entry,
.cpu.alloc_ldt = paravirt_nop,
.cpu.free_ldt = paravirt_nop,
.cpu.load_sp0 = native_load_sp0,
#ifdef CONFIG_X86_64
.cpu.usergs_sysret64 = native_usergs_sysret64,
#endif
.cpu.iret = native_iret,
.cpu.swapgs = native_swapgs,
#ifdef CONFIG_X86_IOPL_IOPERM
.cpu.invalidate_io_bitmap = native_tss_invalidate_io_bitmap,
.cpu.update_io_bitmap = native_tss_update_io_bitmap,
#endif
.cpu.start_context_switch = paravirt_nop,
.cpu.end_context_switch = paravirt_nop,
/* Irq ops. */
.irq.save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
.irq.restore_fl = __PV_IS_CALLEE_SAVE(native_restore_fl),
.irq.irq_disable = __PV_IS_CALLEE_SAVE(native_irq_disable),
.irq.irq_enable = __PV_IS_CALLEE_SAVE(native_irq_enable),
.irq.safe_halt = native_safe_halt,
.irq.halt = native_halt,
#endif /* CONFIG_PARAVIRT_XXL */
/* Mmu ops. */
.mmu.flush_tlb_user = native_flush_tlb_local,
.mmu.flush_tlb_kernel = native_flush_tlb_global,
.mmu.flush_tlb_one_user = native_flush_tlb_one_user,
.mmu.flush_tlb_others = native_flush_tlb_others,
.mmu.tlb_remove_table =
(void (*)(struct mmu_gather *, void *))tlb_remove_page,
.mmu.exit_mmap = paravirt_nop,
#ifdef CONFIG_PARAVIRT_XXL
.mmu.read_cr2 = __PV_IS_CALLEE_SAVE(native_read_cr2),
.mmu.write_cr2 = native_write_cr2,
.mmu.read_cr3 = __native_read_cr3,
.mmu.write_cr3 = native_write_cr3,
.mmu.pgd_alloc = __paravirt_pgd_alloc,
.mmu.pgd_free = paravirt_nop,
.mmu.alloc_pte = paravirt_nop,
.mmu.alloc_pmd = paravirt_nop,
.mmu.alloc_pud = paravirt_nop,
.mmu.alloc_p4d = paravirt_nop,
.mmu.release_pte = paravirt_nop,
.mmu.release_pmd = paravirt_nop,
.mmu.release_pud = paravirt_nop,
.mmu.release_p4d = paravirt_nop,
.mmu.set_pte = native_set_pte,
.mmu.set_pte_at = native_set_pte_at,
.mmu.set_pmd = native_set_pmd,
.mmu.ptep_modify_prot_start = __ptep_modify_prot_start,
.mmu.ptep_modify_prot_commit = __ptep_modify_prot_commit,
#if CONFIG_PGTABLE_LEVELS >= 3
#ifdef CONFIG_X86_PAE
.mmu.set_pte_atomic = native_set_pte_atomic,
.mmu.pte_clear = native_pte_clear,
.mmu.pmd_clear = native_pmd_clear,
#endif
.mmu.set_pud = native_set_pud,
.mmu.pmd_val = PTE_IDENT,
.mmu.make_pmd = PTE_IDENT,
#if CONFIG_PGTABLE_LEVELS >= 4
.mmu.pud_val = PTE_IDENT,
.mmu.make_pud = PTE_IDENT,
.mmu.set_p4d = native_set_p4d,
#if CONFIG_PGTABLE_LEVELS >= 5
.mmu.p4d_val = PTE_IDENT,
.mmu.make_p4d = PTE_IDENT,
.mmu.set_pgd = native_set_pgd,
#endif /* CONFIG_PGTABLE_LEVELS >= 5 */
#endif /* CONFIG_PGTABLE_LEVELS >= 4 */
#endif /* CONFIG_PGTABLE_LEVELS >= 3 */
.mmu.pte_val = PTE_IDENT,
.mmu.pgd_val = PTE_IDENT,
.mmu.make_pte = PTE_IDENT,
.mmu.make_pgd = PTE_IDENT,
.mmu.dup_mmap = paravirt_nop,
.mmu.activate_mm = paravirt_nop,
.mmu.lazy_mode = {
.enter = paravirt_nop,
.leave = paravirt_nop,
.flush = paravirt_nop,
},
.mmu.set_fixmap = native_set_fixmap,
#endif /* CONFIG_PARAVIRT_XXL */
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
/* Lock ops. */
#ifdef CONFIG_SMP
.lock.queued_spin_lock_slowpath = native_queued_spin_lock_slowpath,
.lock.queued_spin_unlock =
PV_CALLEE_SAVE(__native_queued_spin_unlock),
.lock.wait = paravirt_nop,
.lock.kick = paravirt_nop,
.lock.vcpu_is_preempted =
PV_CALLEE_SAVE(__native_vcpu_is_preempted),
#endif /* SMP */
#endif
};
#ifdef CONFIG_PARAVIRT_XXL
/* At this point, native_get/set_debugreg has real function entries */
NOKPROBE_SYMBOL(native_get_debugreg);
NOKPROBE_SYMBOL(native_set_debugreg);
NOKPROBE_SYMBOL(native_load_idt);
#endif
EXPORT_SYMBOL(pv_ops);
EXPORT_SYMBOL_GPL(pv_info);