6b13f685e
김민수
BSP 최초 추가
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#include <linux/kernel.h>
#include <linux/start_kernel.h>
#include <linux/string.h>
#include <linux/console.h>
#include <linux/screen_info.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/lguest.h>
#include <linux/lguest_launcher.h>
#include <linux/virtio_console.h>
#include <linux/pm.h>
#include <linux/export.h>
#include <asm/apic.h>
#include <asm/lguest.h>
#include <asm/paravirt.h>
#include <asm/param.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/desc.h>
#include <asm/setup.h>
#include <asm/e820.h>
#include <asm/mce.h>
#include <asm/io.h>
#include <asm/i387.h>
#include <asm/stackprotector.h>
#include <asm/reboot.h> /* for struct machine_ops */
#include <asm/kvm_para.h>
struct lguest_data lguest_data = {
.hcall_status = { [0 ... LHCALL_RING_SIZE-1] = 0xFF },
.noirq_start = (u32)lguest_noirq_start,
.noirq_end = (u32)lguest_noirq_end,
.kernel_address = PAGE_OFFSET,
.blocked_interrupts = { 1 },
.syscall_vec = SYSCALL_VECTOR,
};
static void async_hcall(unsigned long call, unsigned long arg1,
unsigned long arg2, unsigned long arg3,
unsigned long arg4)
{
static unsigned int next_call;
unsigned long flags;
local_irq_save(flags);
if (lguest_data.hcall_status[next_call] != 0xFF) {
hcall(call, arg1, arg2, arg3, arg4);
} else {
lguest_data.hcalls[next_call].arg0 = call;
lguest_data.hcalls[next_call].arg1 = arg1;
lguest_data.hcalls[next_call].arg2 = arg2;
lguest_data.hcalls[next_call].arg3 = arg3;
lguest_data.hcalls[next_call].arg4 = arg4;
wmb();
lguest_data.hcall_status[next_call] = 0;
if (++next_call == LHCALL_RING_SIZE)
next_call = 0;
}
local_irq_restore(flags);
}
static void lazy_hcall1(unsigned long call, unsigned long arg1)
{
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE)
hcall(call, arg1, 0, 0, 0);
else
async_hcall(call, arg1, 0, 0, 0);
}
static void lazy_hcall2(unsigned long call,
unsigned long arg1,
unsigned long arg2)
{
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE)
hcall(call, arg1, arg2, 0, 0);
else
async_hcall(call, arg1, arg2, 0, 0);
}
static void lazy_hcall3(unsigned long call,
unsigned long arg1,
unsigned long arg2,
unsigned long arg3)
{
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE)
hcall(call, arg1, arg2, arg3, 0);
else
async_hcall(call, arg1, arg2, arg3, 0);
}
#ifdef CONFIG_X86_PAE
static void lazy_hcall4(unsigned long call,
unsigned long arg1,
unsigned long arg2,
unsigned long arg3,
unsigned long arg4)
{
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE)
hcall(call, arg1, arg2, arg3, arg4);
else
async_hcall(call, arg1, arg2, arg3, arg4);
}
#endif
static void lguest_leave_lazy_mmu_mode(void)
{
hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0, 0);
paravirt_leave_lazy_mmu();
}
static void lguest_end_context_switch(struct task_struct *next)
{
hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0, 0);
paravirt_end_context_switch(next);
}
asmlinkage unsigned long lguest_save_fl(void)
{
return lguest_data.irq_enabled;
}
asmlinkage void lguest_irq_disable(void)
{
lguest_data.irq_enabled = 0;
}
PV_CALLEE_SAVE_REGS_THUNK(lguest_save_fl);
PV_CALLEE_SAVE_REGS_THUNK(lguest_irq_disable);
extern void lg_irq_enable(void);
extern void lg_restore_fl(unsigned long flags);
static void lguest_write_idt_entry(gate_desc *dt,
int entrynum, const gate_desc *g)
{
u32 *desc = (u32 *)g;
native_write_idt_entry(dt, entrynum, g);
hcall(LHCALL_LOAD_IDT_ENTRY, entrynum, desc[0], desc[1], 0);
}
static void lguest_load_idt(const struct desc_ptr *desc)
{
unsigned int i;
struct desc_struct *idt = (void *)desc->address;
for (i = 0; i < (desc->size+1)/8; i++)
hcall(LHCALL_LOAD_IDT_ENTRY, i, idt[i].a, idt[i].b, 0);
}
static void lguest_load_gdt(const struct desc_ptr *desc)
{
unsigned int i;
struct desc_struct *gdt = (void *)desc->address;
for (i = 0; i < (desc->size+1)/8; i++)
hcall(LHCALL_LOAD_GDT_ENTRY, i, gdt[i].a, gdt[i].b, 0);
}
static void lguest_write_gdt_entry(struct desc_struct *dt, int entrynum,
const void *desc, int type)
{
native_write_gdt_entry(dt, entrynum, desc, type);
hcall(LHCALL_LOAD_GDT_ENTRY, entrynum,
dt[entrynum].a, dt[entrynum].b, 0);
}
static void lguest_load_tls(struct thread_struct *t, unsigned int cpu)
{
lazy_load_gs(0);
lazy_hcall2(LHCALL_LOAD_TLS, __pa(&t->tls_array), cpu);
}
static void lguest_set_ldt(const void *addr, unsigned entries)
{
}
static void lguest_load_tr_desc(void)
{
}
static void lguest_cpuid(unsigned int *ax, unsigned int *bx,
unsigned int *cx, unsigned int *dx)
{
int function = *ax;
native_cpuid(ax, bx, cx, dx);
switch (function) {
case 0:
if (*ax > 5)
*ax = 5;
break;
case 1:
*cx &= 0x00002201;
*dx &= 0x07808151;
*dx |= 0x00002000;
*ax &= 0xFFFFF0FF;
*ax |= 0x00000500;
break;
case KVM_CPUID_SIGNATURE:
*bx = *cx = *dx = 0;
break;
case 0x80000000:
if (*ax > 0x80000008)
*ax = 0x80000008;
break;
case 0x80000001:
*dx &= ~(1 << 20);
break;
}
}
static unsigned long current_cr0;
static void lguest_write_cr0(unsigned long val)
{
lazy_hcall1(LHCALL_TS, val & X86_CR0_TS);
current_cr0 = val;
}
static unsigned long lguest_read_cr0(void)
{
return current_cr0;
}
static void lguest_clts(void)
{
lazy_hcall1(LHCALL_TS, 0);
current_cr0 &= ~X86_CR0_TS;
}
static unsigned long lguest_read_cr2(void)
{
return lguest_data.cr2;
}
static bool cr3_changed = false;
static unsigned long current_cr3;
static void lguest_write_cr3(unsigned long cr3)
{
lazy_hcall1(LHCALL_NEW_PGTABLE, cr3);
current_cr3 = cr3;
if (cr3 != __pa_symbol(swapper_pg_dir) &&
cr3 != __pa_symbol(initial_page_table))
cr3_changed = true;
}
static unsigned long lguest_read_cr3(void)
{
return current_cr3;
}
static unsigned long lguest_read_cr4(void)
{
return 0;
}
static void lguest_write_cr4(unsigned long val)
{
}
static void lguest_pte_update(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
#ifdef CONFIG_X86_PAE
lazy_hcall4(LHCALL_SET_PTE, __pa(mm->pgd), addr,
ptep->pte_low, ptep->pte_high);
#else
lazy_hcall3(LHCALL_SET_PTE, __pa(mm->pgd), addr, ptep->pte_low);
#endif
}
static void lguest_set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval)
{
native_set_pte(ptep, pteval);
lguest_pte_update(mm, addr, ptep);
}
#ifdef CONFIG_X86_PAE
static void lguest_set_pud(pud_t *pudp, pud_t pudval)
{
native_set_pud(pudp, pudval);
lazy_hcall2(LHCALL_SET_PGD, __pa(pudp) & 0xFFFFFFE0,
(__pa(pudp) & 0x1F) / sizeof(pud_t));
}
static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval)
{
native_set_pmd(pmdp, pmdval);
lazy_hcall2(LHCALL_SET_PMD, __pa(pmdp) & PAGE_MASK,
(__pa(pmdp) & (PAGE_SIZE - 1)) / sizeof(pmd_t));
}
#else
static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval)
{
native_set_pmd(pmdp, pmdval);
lazy_hcall2(LHCALL_SET_PGD, __pa(pmdp) & PAGE_MASK,
(__pa(pmdp) & (PAGE_SIZE - 1)) / sizeof(pmd_t));
}
#endif
static void lguest_set_pte(pte_t *ptep, pte_t pteval)
{
native_set_pte(ptep, pteval);
if (cr3_changed)
lazy_hcall1(LHCALL_FLUSH_TLB, 1);
}
#ifdef CONFIG_X86_PAE
static void lguest_set_pte_atomic(pte_t *ptep, pte_t pte)
{
native_set_pte_atomic(ptep, pte);
if (cr3_changed)
lazy_hcall1(LHCALL_FLUSH_TLB, 1);
}
static void lguest_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
native_pte_clear(mm, addr, ptep);
lguest_pte_update(mm, addr, ptep);
}
static void lguest_pmd_clear(pmd_t *pmdp)
{
lguest_set_pmd(pmdp, __pmd(0));
}
#endif
static void lguest_flush_tlb_single(unsigned long addr)
{
lazy_hcall3(LHCALL_SET_PTE, current_cr3, addr, 0);
}
static void lguest_flush_tlb_user(void)
{
lazy_hcall1(LHCALL_FLUSH_TLB, 0);
}
static void lguest_flush_tlb_kernel(void)
{
lazy_hcall1(LHCALL_FLUSH_TLB, 1);
}
static void disable_lguest_irq(struct irq_data *data)
{
set_bit(data->irq, lguest_data.blocked_interrupts);
}
static void enable_lguest_irq(struct irq_data *data)
{
clear_bit(data->irq, lguest_data.blocked_interrupts);
}
static struct irq_chip lguest_irq_controller = {
.name = "lguest",
.irq_mask = disable_lguest_irq,
.irq_mask_ack = disable_lguest_irq,
.irq_unmask = enable_lguest_irq,
};
static void __init lguest_init_IRQ(void)
{
unsigned int i;
for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
__this_cpu_write(vector_irq[i], i - FIRST_EXTERNAL_VECTOR);
if (i != SYSCALL_VECTOR)
set_intr_gate(i, interrupt[i - FIRST_EXTERNAL_VECTOR]);
}
irq_ctx_init(smp_processor_id());
}
int lguest_setup_irq(unsigned int irq)
{
int err;
err = irq_alloc_desc_at(irq, 0);
if (err < 0 && err != -EEXIST)
return err;
irq_set_chip_and_handler_name(irq, &lguest_irq_controller,
handle_level_irq, "level");
return 0;
}
static void lguest_get_wallclock(struct timespec *now)
{
*now = lguest_data.time;
}
static unsigned long lguest_tsc_khz(void)
{
return lguest_data.tsc_khz;
}
static cycle_t lguest_clock_read(struct clocksource *cs)
{
unsigned long sec, nsec;
do {
sec = lguest_data.time.tv_sec;
rmb();
nsec = lguest_data.time.tv_nsec;
rmb();
} while (unlikely(lguest_data.time.tv_sec != sec));
return sec*1000000000ULL + nsec;
}
static struct clocksource lguest_clock = {
.name = "lguest",
.rating = 200,
.read = lguest_clock_read,
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static int lguest_clockevent_set_next_event(unsigned long delta,
struct clock_event_device *evt)
{
if (delta < LG_CLOCK_MIN_DELTA) {
if (printk_ratelimit())
printk(KERN_DEBUG "%s: small delta %lu ns
",
__func__, delta);
return -ETIME;
}
hcall(LHCALL_SET_CLOCKEVENT, delta, 0, 0, 0);
return 0;
}
static void lguest_clockevent_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
switch (mode) {
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
hcall(LHCALL_SET_CLOCKEVENT, 0, 0, 0, 0);
break;
case CLOCK_EVT_MODE_ONESHOT:
break;
case CLOCK_EVT_MODE_PERIODIC:
BUG();
case CLOCK_EVT_MODE_RESUME:
break;
}
}
static struct clock_event_device lguest_clockevent = {
.name = "lguest",
.features = CLOCK_EVT_FEAT_ONESHOT,
.set_next_event = lguest_clockevent_set_next_event,
.set_mode = lguest_clockevent_set_mode,
.rating = INT_MAX,
.mult = 1,
.shift = 0,
.min_delta_ns = LG_CLOCK_MIN_DELTA,
.max_delta_ns = LG_CLOCK_MAX_DELTA,
};
static void lguest_time_irq(unsigned int irq, struct irq_desc *desc)
{
unsigned long flags;
local_irq_save(flags);
lguest_clockevent.event_handler(&lguest_clockevent);
local_irq_restore(flags);
}
static void lguest_time_init(void)
{
lguest_setup_irq(0);
irq_set_handler(0, lguest_time_irq);
clocksource_register_hz(&lguest_clock, NSEC_PER_SEC);
lguest_clockevent.cpumask = cpumask_of(0);
clockevents_register_device(&lguest_clockevent);
clear_bit(0, lguest_data.blocked_interrupts);
}
static void lguest_load_sp0(struct tss_struct *tss,
struct thread_struct *thread)
{
lazy_hcall3(LHCALL_SET_STACK, __KERNEL_DS | 0x1, thread->sp0,
THREAD_SIZE / PAGE_SIZE);
}
static unsigned long lguest_get_debugreg(int regno)
{
return 0;
}
static void lguest_set_debugreg(int regno, unsigned long value)
{
}
static void lguest_wbinvd(void)
{
}
#ifdef CONFIG_X86_LOCAL_APIC
static void lguest_apic_write(u32 reg, u32 v)
{
}
static u32 lguest_apic_read(u32 reg)
{
return 0;
}
static u64 lguest_apic_icr_read(void)
{
return 0;
}
static void lguest_apic_icr_write(u32 low, u32 id)
{
WARN_ON(1);
}
static void lguest_apic_wait_icr_idle(void)
{
return;
}
static u32 lguest_apic_safe_wait_icr_idle(void)
{
return 0;
}
static void set_lguest_basic_apic_ops(void)
{
apic->read = lguest_apic_read;
apic->write = lguest_apic_write;
apic->icr_read = lguest_apic_icr_read;
apic->icr_write = lguest_apic_icr_write;
apic->wait_icr_idle = lguest_apic_wait_icr_idle;
apic->safe_wait_icr_idle = lguest_apic_safe_wait_icr_idle;
};
#endif
static void lguest_safe_halt(void)
{
hcall(LHCALL_HALT, 0, 0, 0, 0);
}
static void lguest_power_off(void)
{
hcall(LHCALL_SHUTDOWN, __pa("Power down"),
LGUEST_SHUTDOWN_POWEROFF, 0, 0);
}
static int lguest_panic(struct notifier_block *nb, unsigned long l, void *p)
{
hcall(LHCALL_SHUTDOWN, __pa(p), LGUEST_SHUTDOWN_POWEROFF, 0, 0);
return NOTIFY_DONE;
}
static struct notifier_block paniced = {
.notifier_call = lguest_panic
};
static __init char *lguest_memory_setup(void)
{
e820_add_region(boot_params.e820_map[0].addr,
boot_params.e820_map[0].size,
boot_params.e820_map[0].type);
return "LGUEST";
}
static __init int early_put_chars(u32 vtermno, const char *buf, int count)
{
char scratch[17];
unsigned int len = count;
if (len > sizeof(scratch) - 1)
len = sizeof(scratch) - 1;
scratch[len] = '\0';
memcpy(scratch, buf, len);
hcall(LHCALL_NOTIFY, __pa(scratch), 0, 0, 0);
return len;
}
static void lguest_restart(char *reason)
{
hcall(LHCALL_SHUTDOWN, __pa(reason), LGUEST_SHUTDOWN_RESTART, 0, 0);
}
static const struct lguest_insns
{
const char *start, *end;
} lguest_insns[] = {
[PARAVIRT_PATCH(pv_irq_ops.irq_disable)] = { lgstart_cli, lgend_cli },
[PARAVIRT_PATCH(pv_irq_ops.save_fl)] = { lgstart_pushf, lgend_pushf },
};
static unsigned lguest_patch(u8 type, u16 clobber, void *ibuf,
unsigned long addr, unsigned len)
{
unsigned int insn_len;
if (type >= ARRAY_SIZE(lguest_insns) || !lguest_insns[type].start)
return paravirt_patch_default(type, clobber, ibuf, addr, len);
insn_len = lguest_insns[type].end - lguest_insns[type].start;
if (len < insn_len)
return paravirt_patch_default(type, clobber, ibuf, addr, len);
memcpy(ibuf, lguest_insns[type].start, insn_len);
return insn_len;
}
__init void lguest_init(void)
{
pv_info.name = "lguest";
pv_info.paravirt_enabled = 1;
pv_info.kernel_rpl = 1;
pv_info.shared_kernel_pmd = 1;
pv_irq_ops.save_fl = PV_CALLEE_SAVE(lguest_save_fl);
pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(lg_restore_fl);
pv_irq_ops.irq_disable = PV_CALLEE_SAVE(lguest_irq_disable);
pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(lg_irq_enable);
pv_irq_ops.safe_halt = lguest_safe_halt;
pv_init_ops.patch = lguest_patch;
pv_cpu_ops.load_gdt = lguest_load_gdt;
pv_cpu_ops.cpuid = lguest_cpuid;
pv_cpu_ops.load_idt = lguest_load_idt;
pv_cpu_ops.iret = lguest_iret;
pv_cpu_ops.load_sp0 = lguest_load_sp0;
pv_cpu_ops.load_tr_desc = lguest_load_tr_desc;
pv_cpu_ops.set_ldt = lguest_set_ldt;
pv_cpu_ops.load_tls = lguest_load_tls;
pv_cpu_ops.get_debugreg = lguest_get_debugreg;
pv_cpu_ops.set_debugreg = lguest_set_debugreg;
pv_cpu_ops.clts = lguest_clts;
pv_cpu_ops.read_cr0 = lguest_read_cr0;
pv_cpu_ops.write_cr0 = lguest_write_cr0;
pv_cpu_ops.read_cr4 = lguest_read_cr4;
pv_cpu_ops.write_cr4 = lguest_write_cr4;
pv_cpu_ops.write_gdt_entry = lguest_write_gdt_entry;
pv_cpu_ops.write_idt_entry = lguest_write_idt_entry;
pv_cpu_ops.wbinvd = lguest_wbinvd;
pv_cpu_ops.start_context_switch = paravirt_start_context_switch;
pv_cpu_ops.end_context_switch = lguest_end_context_switch;
pv_mmu_ops.write_cr3 = lguest_write_cr3;
pv_mmu_ops.flush_tlb_user = lguest_flush_tlb_user;
pv_mmu_ops.flush_tlb_single = lguest_flush_tlb_single;
pv_mmu_ops.flush_tlb_kernel = lguest_flush_tlb_kernel;
pv_mmu_ops.set_pte = lguest_set_pte;
pv_mmu_ops.set_pte_at = lguest_set_pte_at;
pv_mmu_ops.set_pmd = lguest_set_pmd;
#ifdef CONFIG_X86_PAE
pv_mmu_ops.set_pte_atomic = lguest_set_pte_atomic;
pv_mmu_ops.pte_clear = lguest_pte_clear;
pv_mmu_ops.pmd_clear = lguest_pmd_clear;
pv_mmu_ops.set_pud = lguest_set_pud;
#endif
pv_mmu_ops.read_cr2 = lguest_read_cr2;
pv_mmu_ops.read_cr3 = lguest_read_cr3;
pv_mmu_ops.lazy_mode.enter = paravirt_enter_lazy_mmu;
pv_mmu_ops.lazy_mode.leave = lguest_leave_lazy_mmu_mode;
pv_mmu_ops.lazy_mode.flush = paravirt_flush_lazy_mmu;
pv_mmu_ops.pte_update = lguest_pte_update;
pv_mmu_ops.pte_update_defer = lguest_pte_update;
#ifdef CONFIG_X86_LOCAL_APIC
set_lguest_basic_apic_ops();
#endif
x86_init.resources.memory_setup = lguest_memory_setup;
x86_init.irqs.intr_init = lguest_init_IRQ;
x86_init.timers.timer_init = lguest_time_init;
x86_platform.calibrate_tsc = lguest_tsc_khz;
x86_platform.get_wallclock = lguest_get_wallclock;
setup_stack_canary_segment(0);
switch_to_new_gdt(0);
reserve_top_address(lguest_data.reserve_mem);
lockdep_init();
atomic_notifier_chain_register(&panic_notifier_list, &paniced);
paravirt_disable_iospace();
cpu_detect(&new_cpu_data);
new_cpu_data.x86_capability[0] = cpuid_edx(1);
set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU);
#ifdef CONFIG_X86_MCE
mca_cfg.disabled = true;
#endif
#ifdef CONFIG_ACPI
acpi_disabled = 1;
#endif
add_preferred_console("hvc", 0, NULL);
virtio_cons_early_init(early_put_chars);
pm_power_off = lguest_power_off;
machine_ops.restart = lguest_restart;
i386_start_kernel();
}
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