d6dd61c831
Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: linux-arch@vger.kernel.org Cc: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: Ingo Molnar <mingo@elte.hu>
254 lines
6.8 KiB
C
254 lines
6.8 KiB
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
|
|
*/
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/efi.h>
|
|
#include <linux/bcd.h>
|
|
#include <linux/start_kernel.h>
|
|
|
|
#include <asm/bug.h>
|
|
#include <asm/paravirt.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/arch_hooks.h>
|
|
#include <asm/time.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)
|
|
{
|
|
}
|
|
|
|
static void __init default_banner(void)
|
|
{
|
|
printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
|
|
paravirt_ops.name);
|
|
}
|
|
|
|
char *memory_setup(void)
|
|
{
|
|
return paravirt_ops.memory_setup();
|
|
}
|
|
|
|
/* Simple instruction patching code. */
|
|
#define DEF_NATIVE(name, code) \
|
|
extern const char start_##name[], end_##name[]; \
|
|
asm("start_" #name ": " code "; end_" #name ":")
|
|
DEF_NATIVE(cli, "cli");
|
|
DEF_NATIVE(sti, "sti");
|
|
DEF_NATIVE(popf, "push %eax; popf");
|
|
DEF_NATIVE(pushf, "pushf; pop %eax");
|
|
DEF_NATIVE(pushf_cli, "pushf; pop %eax; cli");
|
|
DEF_NATIVE(iret, "iret");
|
|
DEF_NATIVE(sti_sysexit, "sti; sysexit");
|
|
|
|
static const struct native_insns
|
|
{
|
|
const char *start, *end;
|
|
} native_insns[] = {
|
|
[PARAVIRT_IRQ_DISABLE] = { start_cli, end_cli },
|
|
[PARAVIRT_IRQ_ENABLE] = { start_sti, end_sti },
|
|
[PARAVIRT_RESTORE_FLAGS] = { start_popf, end_popf },
|
|
[PARAVIRT_SAVE_FLAGS] = { start_pushf, end_pushf },
|
|
[PARAVIRT_SAVE_FLAGS_IRQ_DISABLE] = { start_pushf_cli, end_pushf_cli },
|
|
[PARAVIRT_INTERRUPT_RETURN] = { start_iret, end_iret },
|
|
[PARAVIRT_STI_SYSEXIT] = { start_sti_sysexit, end_sti_sysexit },
|
|
};
|
|
|
|
static unsigned native_patch(u8 type, u16 clobbers, void *insns, unsigned len)
|
|
{
|
|
unsigned int insn_len;
|
|
|
|
/* Don't touch it if we don't have a replacement */
|
|
if (type >= ARRAY_SIZE(native_insns) || !native_insns[type].start)
|
|
return len;
|
|
|
|
insn_len = native_insns[type].end - native_insns[type].start;
|
|
|
|
/* Similarly if we can't fit replacement. */
|
|
if (len < insn_len)
|
|
return len;
|
|
|
|
memcpy(insns, native_insns[type].start, insn_len);
|
|
return insn_len;
|
|
}
|
|
|
|
void init_IRQ(void)
|
|
{
|
|
paravirt_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(u32 addr)
|
|
{
|
|
__native_flush_tlb_single(addr);
|
|
}
|
|
|
|
/* These are in entry.S */
|
|
extern void native_iret(void);
|
|
extern void native_irq_enable_sysexit(void);
|
|
|
|
static int __init print_banner(void)
|
|
{
|
|
paravirt_ops.banner();
|
|
return 0;
|
|
}
|
|
core_initcall(print_banner);
|
|
|
|
struct paravirt_ops paravirt_ops = {
|
|
.name = "bare hardware",
|
|
.paravirt_enabled = 0,
|
|
.kernel_rpl = 0,
|
|
.shared_kernel_pmd = 1, /* Only used when CONFIG_X86_PAE is set */
|
|
|
|
.patch = native_patch,
|
|
.banner = default_banner,
|
|
.arch_setup = paravirt_nop,
|
|
.memory_setup = machine_specific_memory_setup,
|
|
.get_wallclock = native_get_wallclock,
|
|
.set_wallclock = native_set_wallclock,
|
|
.time_init = hpet_time_init,
|
|
.init_IRQ = native_init_IRQ,
|
|
|
|
.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_cr2 = native_read_cr2,
|
|
.write_cr2 = native_write_cr2,
|
|
.read_cr3 = native_read_cr3,
|
|
.write_cr3 = native_write_cr3,
|
|
.read_cr4 = native_read_cr4,
|
|
.read_cr4_safe = native_read_cr4_safe,
|
|
.write_cr4 = native_write_cr4,
|
|
.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,
|
|
.wbinvd = native_wbinvd,
|
|
.read_msr = native_read_msr_safe,
|
|
.write_msr = native_write_msr_safe,
|
|
.read_tsc = native_read_tsc,
|
|
.read_pmc = native_read_pmc,
|
|
.get_scheduled_cycles = native_read_tsc,
|
|
.get_cpu_khz = native_calculate_cpu_khz,
|
|
.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,
|
|
.write_ldt_entry = write_dt_entry,
|
|
.write_gdt_entry = write_dt_entry,
|
|
.write_idt_entry = write_dt_entry,
|
|
.load_esp0 = native_load_esp0,
|
|
|
|
.set_iopl_mask = native_set_iopl_mask,
|
|
.io_delay = native_io_delay,
|
|
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
.apic_write = native_apic_write,
|
|
.apic_write_atomic = native_apic_write_atomic,
|
|
.apic_read = native_apic_read,
|
|
.setup_boot_clock = setup_boot_APIC_clock,
|
|
.setup_secondary_clock = setup_secondary_APIC_clock,
|
|
#endif
|
|
.set_lazy_mode = paravirt_nop,
|
|
|
|
.pagetable_setup_start = native_pagetable_setup_start,
|
|
.pagetable_setup_done = native_pagetable_setup_done,
|
|
|
|
.flush_tlb_user = native_flush_tlb,
|
|
.flush_tlb_kernel = native_flush_tlb_global,
|
|
.flush_tlb_single = native_flush_tlb_single,
|
|
|
|
.map_pt_hook = paravirt_nop,
|
|
|
|
.alloc_pt = paravirt_nop,
|
|
.alloc_pd = paravirt_nop,
|
|
.alloc_pd_clone = paravirt_nop,
|
|
.release_pt = paravirt_nop,
|
|
.release_pd = 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_get_and_clear = native_ptep_get_and_clear,
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
.set_pte_atomic = native_set_pte_atomic,
|
|
.set_pte_present = native_set_pte_present,
|
|
.set_pud = native_set_pud,
|
|
.pte_clear = native_pte_clear,
|
|
.pmd_clear = native_pmd_clear,
|
|
|
|
.pmd_val = native_pmd_val,
|
|
.make_pmd = native_make_pmd,
|
|
#endif
|
|
|
|
.pte_val = native_pte_val,
|
|
.pgd_val = native_pgd_val,
|
|
|
|
.make_pte = native_make_pte,
|
|
.make_pgd = native_make_pgd,
|
|
|
|
.irq_enable_sysexit = native_irq_enable_sysexit,
|
|
.iret = native_iret,
|
|
|
|
.dup_mmap = paravirt_nop,
|
|
.exit_mmap = paravirt_nop,
|
|
.activate_mm = paravirt_nop,
|
|
|
|
.startup_ipi_hook = paravirt_nop,
|
|
};
|
|
|
|
/*
|
|
* NOTE: CONFIG_PARAVIRT is experimental and the paravirt_ops
|
|
* semantics are subject to change. Hence we only do this
|
|
* internal-only export of this, until it gets sorted out and
|
|
* all lowlevel CPU ops used by modules are separately exported.
|
|
*/
|
|
EXPORT_SYMBOL_GPL(paravirt_ops);
|