diff options
| -rw-r--r-- | drivers/lguest/lguest.c | 544 | ||||
| -rw-r--r-- | drivers/lguest/lguest_asm.S | 53 | ||||
| -rw-r--r-- | drivers/lguest/lguest_bus.c | 148 | ||||
| -rw-r--r-- | include/linux/lguest.h | 85 | ||||
| -rw-r--r-- | include/linux/lguest_bus.h | 48 |
5 files changed, 878 insertions, 0 deletions
diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c new file mode 100644 index 0000000..b3a72bd --- /dev/null +++ b/drivers/lguest/lguest.c @@ -0,0 +1,544 @@ +/* + * Lguest specific paravirt-ops implementation + * + * Copyright (C) 2006, Rusty Russell <rusty@rustcorp.com.au> 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, GOOD TITLE or + * NON INFRINGEMENT. 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#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/lguest.h> +#include <linux/lguest_launcher.h> +#include <linux/lguest_bus.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> + +/* Declarations for definitions in lguest_guest.S */ +extern char lguest_noirq_start[], lguest_noirq_end[]; +extern const char lgstart_cli[], lgend_cli[]; +extern const char lgstart_sti[], lgend_sti[]; +extern const char lgstart_popf[], lgend_popf[]; +extern const char lgstart_pushf[], lgend_pushf[]; +extern const char lgstart_iret[], lgend_iret[]; +extern void lguest_iret(void); + +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, + .blocked_interrupts = { 1 }, /* Block timer interrupts */ +}; +struct lguest_device_desc *lguest_devices; +static __initdata const struct lguest_boot_info *boot = __va(0); + +static enum paravirt_lazy_mode lazy_mode; +static void lguest_lazy_mode(enum paravirt_lazy_mode mode) +{ + if (mode == PARAVIRT_LAZY_FLUSH) { + if (unlikely(lazy_mode != PARAVIRT_LAZY_NONE)) + hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0); + } else { + lazy_mode = mode; + if (mode == PARAVIRT_LAZY_NONE) + hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0); + } +} + +static void lazy_hcall(unsigned long call, + unsigned long arg1, + unsigned long arg2, + unsigned long arg3) +{ + if (lazy_mode == PARAVIRT_LAZY_NONE) + hcall(call, arg1, arg2, arg3); + else + async_hcall(call, arg1, arg2, arg3); +} + +void async_hcall(unsigned long call, + unsigned long arg1, unsigned long arg2, unsigned long arg3) +{ + /* Note: This code assumes we're uniprocessor. */ + static unsigned int next_call; + unsigned long flags; + + local_irq_save(flags); + if (lguest_data.hcall_status[next_call] != 0xFF) { + /* Table full, so do normal hcall which will flush table. */ + hcall(call, arg1, arg2, arg3); + } else { + lguest_data.hcalls[next_call].eax = call; + lguest_data.hcalls[next_call].edx = arg1; + lguest_data.hcalls[next_call].ebx = arg2; + lguest_data.hcalls[next_call].ecx = arg3; + /* Make sure host sees arguments before "valid" flag. */ + wmb(); + lguest_data.hcall_status[next_call] = 0; + if (++next_call == LHCALL_RING_SIZE) + next_call = 0; + } + local_irq_restore(flags); +} + +void lguest_send_dma(unsigned long key, struct lguest_dma *dma) +{ + dma->used_len = 0; + hcall(LHCALL_SEND_DMA, key, __pa(dma), 0); +} + +int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas, + unsigned int num, u8 irq) +{ + if (!hcall(LHCALL_BIND_DMA, key, __pa(dmas), (num << 8) | irq)) + return -ENOMEM; + return 0; +} + +void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas) +{ + hcall(LHCALL_BIND_DMA, key, __pa(dmas), 0); +} + +/* For guests, device memory can be used as normal memory, so we cast away the + * __iomem to quieten sparse. */ +void *lguest_map(unsigned long phys_addr, unsigned long pages) +{ + return (__force void *)ioremap(phys_addr, PAGE_SIZE*pages); +} + +void lguest_unmap(void *addr) +{ + iounmap((__force void __iomem *)addr); +} + +static unsigned long save_fl(void) +{ + return lguest_data.irq_enabled; +} + +static void restore_fl(unsigned long flags) +{ + /* FIXME: Check if interrupt pending... */ + lguest_data.irq_enabled = flags; +} + +static void irq_disable(void) +{ + lguest_data.irq_enabled = 0; +} + +static void irq_enable(void) +{ + /* FIXME: Check if interrupt pending... */ + lguest_data.irq_enabled = X86_EFLAGS_IF; +} + +static void lguest_write_idt_entry(struct desc_struct *dt, + int entrynum, u32 low, u32 high) +{ + write_dt_entry(dt, entrynum, low, high); + hcall(LHCALL_LOAD_IDT_ENTRY, entrynum, low, high); +} + +static void lguest_load_idt(const struct Xgt_desc_struct *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); +} + +static void lguest_load_gdt(const struct Xgt_desc_struct *desc) +{ + BUG_ON((desc->size+1)/8 != GDT_ENTRIES); + hcall(LHCALL_LOAD_GDT, __pa(desc->address), GDT_ENTRIES, 0); +} + +static void lguest_write_gdt_entry(struct desc_struct *dt, + int entrynum, u32 low, u32 high) +{ + write_dt_entry(dt, entrynum, low, high); + hcall(LHCALL_LOAD_GDT, __pa(dt), GDT_ENTRIES, 0); +} + +static void lguest_load_tls(struct thread_struct *t, unsigned int cpu) +{ + lazy_hcall(LHCALL_LOAD_TLS, __pa(&t->tls_array), cpu, 0); +} + +static void lguest_set_ldt(const void *addr, unsigned entries) +{ +} + +static void lguest_load_tr_desc(void) +{ +} + +static void lguest_cpuid(unsigned int *eax, unsigned int *ebx, + unsigned int *ecx, unsigned int *edx) +{ + int function = *eax; + + native_cpuid(eax, ebx, ecx, edx); + switch (function) { + case 1: /* Basic feature request. */ + /* We only allow kernel to see SSE3, CMPXCHG16B and SSSE3 */ + *ecx &= 0x00002201; + /* Similarly: SSE, SSE2, FXSR, MMX, CMOV, CMPXCHG8B, FPU. */ + *edx &= 0x07808101; + /* Host wants to know when we flush kernel pages: set PGE. */ + *edx |= 0x00002000; + break; + case 0x80000000: + /* Futureproof this a little: if they ask how much extended + * processor information, limit it to known fields. */ + if (*eax > 0x80000008) + *eax = 0x80000008; + break; + } +} + +static unsigned long current_cr0, current_cr3; +static void lguest_write_cr0(unsigned long val) +{ + lazy_hcall(LHCALL_TS, val & 8, 0, 0); + current_cr0 = val; +} + +static unsigned long lguest_read_cr0(void) +{ + return current_cr0; +} + +static void lguest_clts(void) +{ + lazy_hcall(LHCALL_TS, 0, 0, 0); + current_cr0 &= ~8U; +} + +static unsigned long lguest_read_cr2(void) +{ + return lguest_data.cr2; +} + +static void lguest_write_cr3(unsigned long cr3) +{ + lazy_hcall(LHCALL_NEW_PGTABLE, cr3, 0, 0); + current_cr3 = cr3; +} + +static unsigned long lguest_read_cr3(void) +{ + return current_cr3; +} + +/* Used to enable/disable PGE, but we don't care. */ +static unsigned long lguest_read_cr4(void) +{ + return 0; +} + +static void lguest_write_cr4(unsigned long val) +{ +} + +static void lguest_set_pte_at(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pteval) +{ + *ptep = pteval; + lazy_hcall(LHCALL_SET_PTE, __pa(mm->pgd), addr, pteval.pte_low); +} + +/* We only support two-level pagetables at the moment. */ +static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval) +{ + *pmdp = pmdval; + lazy_hcall(LHCALL_SET_PMD, __pa(pmdp)&PAGE_MASK, + (__pa(pmdp)&(PAGE_SIZE-1))/4, 0); +} + +/* FIXME: Eliminate all callers of this. */ +static void lguest_set_pte(pte_t *ptep, pte_t pteval) +{ + *ptep = pteval; + /* Don't bother with hypercall before initial setup. */ + if (current_cr3) + lazy_hcall(LHCALL_FLUSH_TLB, 1, 0, 0); +} + +static void lguest_flush_tlb_single(unsigned long addr) +{ + /* Simply set it to zero, and it will fault back in. */ + lazy_hcall(LHCALL_SET_PTE, current_cr3, addr, 0); +} + +static void lguest_flush_tlb_user(void) +{ + lazy_hcall(LHCALL_FLUSH_TLB, 0, 0, 0); +} + +static void lguest_flush_tlb_kernel(void) +{ + lazy_hcall(LHCALL_FLUSH_TLB, 1, 0, 0); +} + +static void disable_lguest_irq(unsigned int irq) +{ + set_bit(irq, lguest_data.blocked_interrupts); +} + +static void enable_lguest_irq(unsigned int irq) +{ + clear_bit(irq, lguest_data.blocked_interrupts); + /* FIXME: If it's pending? */ +} + +static struct irq_chip lguest_irq_controller = { + .name = "lguest", + .mask = disable_lguest_irq, + .mask_ack = disable_lguest_irq, + .unmask = enable_lguest_irq, +}; + +static void __init lguest_init_IRQ(void) +{ + unsigned int i; + + for (i = 0; i < LGUEST_IRQS; i++) { + int vector = FIRST_EXTERNAL_VECTOR + i; + if (vector != SYSCALL_VECTOR) { + set_intr_gate(vector, interrupt[i]); + set_irq_chip_and_handler(i, &lguest_irq_controller, + handle_level_irq); + } + } + irq_ctx_init(smp_processor_id()); +} + +static unsigned long lguest_get_wallclock(void) +{ + return hcall(LHCALL_GET_WALLCLOCK, 0, 0, 0); +} + +static void lguest_time_irq(unsigned int irq, struct irq_desc *desc) +{ + do_timer(hcall(LHCALL_TIMER_READ, 0, 0, 0)); + update_process_times(user_mode_vm(get_irq_regs())); +} + +static u64 sched_clock_base; +static void lguest_time_init(void) +{ + set_irq_handler(0, lguest_time_irq); + hcall(LHCALL_TIMER_READ, 0, 0, 0); + sched_clock_base = jiffies_64; + enable_lguest_irq(0); +} + +static unsigned long long lguest_sched_clock(void) +{ + return (jiffies_64 - sched_clock_base) * (1000000000 / HZ); +} + +static void lguest_load_esp0(struct tss_struct *tss, + struct thread_struct *thread) +{ + lazy_hcall(LHCALL_SET_STACK, __KERNEL_DS|0x1, thread->esp0, + THREAD_SIZE/PAGE_SIZE); +} + +static void lguest_set_debugreg(int regno, unsigned long value) +{ + /* FIXME: Implement */ +} + +static void lguest_wbinvd(void) +{ +} + +#ifdef CONFIG_X86_LOCAL_APIC +static void lguest_apic_write(unsigned long reg, unsigned long v) +{ +} + +static unsigned long lguest_apic_read(unsigned long reg) +{ + return 0; +} +#endif + +static void lguest_safe_halt(void) +{ + hcall(LHCALL_HALT, 0, 0, 0); +} + +static void lguest_power_off(void) +{ + hcall(LHCALL_CRASH, __pa("Power down"), 0, 0); +} + +static int lguest_panic(struct notifier_block *nb, unsigned long l, void *p) +{ + hcall(LHCALL_CRASH, __pa(p), 0, 0); + return NOTIFY_DONE; +} + +static struct notifier_block paniced = { + .notifier_call = lguest_panic +}; + +static __init char *lguest_memory_setup(void) +{ + /* We do this here because lockcheck barfs if before start_kernel */ + atomic_notifier_chain_register(&panic_notifier_list, &paniced); + + e820.nr_map = 0; + add_memory_region(0, PFN_PHYS(boot->max_pfn), E820_RAM); + return "LGUEST"; +} + +static const struct lguest_insns +{ + const char *start, *end; +} lguest_insns[] = { + [PARAVIRT_PATCH(irq_disable)] = { lgstart_cli, lgend_cli }, + [PARAVIRT_PATCH(irq_enable)] = { lgstart_sti, lgend_sti }, + [PARAVIRT_PATCH(restore_fl)] = { lgstart_popf, lgend_popf }, + [PARAVIRT_PATCH(save_fl)] = { lgstart_pushf, lgend_pushf }, +}; +static unsigned lguest_patch(u8 type, u16 clobber, void *insns, unsigned len) +{ + unsigned int insn_len; + + /* Don't touch it if we don't have a replacement */ + if (type >= ARRAY_SIZE(lguest_insns) || !lguest_insns[type].start) + return paravirt_patch_default(type, clobber, insns, len); + + insn_len = lguest_insns[type].end - lguest_insns[type].start; + + /* Similarly if we can't fit replacement. */ + if (len < insn_len) + return paravirt_patch_default(type, clobber, insns, len); + + memcpy(insns, lguest_insns[type].start, insn_len); + return insn_len; +} + +__init void lguest_init(void) +{ + paravirt_ops.name = "lguest"; + paravirt_ops.paravirt_enabled = 1; + paravirt_ops.kernel_rpl = 1; + + paravirt_ops.save_fl = save_fl; + paravirt_ops.restore_fl = restore_fl; + paravirt_ops.irq_disable = irq_disable; + paravirt_ops.irq_enable = irq_enable; + paravirt_ops.load_gdt = lguest_load_gdt; + paravirt_ops.memory_setup = lguest_memory_setup; + paravirt_ops.cpuid = lguest_cpuid; + paravirt_ops.write_cr3 = lguest_write_cr3; + paravirt_ops.flush_tlb_user = lguest_flush_tlb_user; + paravirt_ops.flush_tlb_single = lguest_flush_tlb_single; + paravirt_ops.flush_tlb_kernel = lguest_flush_tlb_kernel; + paravirt_ops.set_pte = lguest_set_pte; + paravirt_ops.set_pte_at = lguest_set_pte_at; + paravirt_ops.set_pmd = lguest_set_pmd; +#ifdef CONFIG_X86_LOCAL_APIC + paravirt_ops.apic_write = lguest_apic_write; + paravirt_ops.apic_write_atomic = lguest_apic_write; + paravirt_ops.apic_read = lguest_apic_read; +#endif + paravirt_ops.load_idt = lguest_load_idt; + paravirt_ops.iret = lguest_iret; + paravirt_ops.load_esp0 = lguest_load_esp0; + paravirt_ops.load_tr_desc = lguest_load_tr_desc; + paravirt_ops.set_ldt = lguest_set_ldt; + paravirt_ops.load_tls = lguest_load_tls; + paravirt_ops.set_debugreg = lguest_set_debugreg; + paravirt_ops.clts = lguest_clts; + paravirt_ops.read_cr0 = lguest_read_cr0; + paravirt_ops.write_cr0 = lguest_write_cr0; + paravirt_ops.init_IRQ = lguest_init_IRQ; + paravirt_ops.read_cr2 = lguest_read_cr2; + paravirt_ops.read_cr3 = lguest_read_cr3; + paravirt_ops.read_cr4 = lguest_read_cr4; + paravirt_ops.write_cr4 = lguest_write_cr4; + paravirt_ops.write_gdt_entry = lguest_write_gdt_entry; + paravirt_ops.write_idt_entry = lguest_write_idt_entry; + paravirt_ops.patch = lguest_patch; + paravirt_ops.safe_halt = lguest_safe_halt; + paravirt_ops.get_wallclock = lguest_get_wallclock; + paravirt_ops.time_init = lguest_time_init; + paravirt_ops.set_lazy_mode = lguest_lazy_mode; + paravirt_ops.wbinvd = lguest_wbinvd; + paravirt_ops.sched_clock = lguest_sched_clock; + + hcall(LHCALL_LGUEST_INIT, __pa(&lguest_data), 0, 0); + strncpy(boot_command_line, boot->cmdline, COMMAND_LINE_SIZE); + + /* We use top of mem for initial pagetables. */ + init_pg_tables_end = __pa(pg0); + + asm volatile ("mov %0, %%fs" : : "r" (__KERNEL_DS) : "memory"); + + reserve_top_address(lguest_data.reserve_mem); + + lockdep_init(); + + paravirt_disable_iospace(); + + cpu_detect(&new_cpu_data); + /* head.S usually sets up the first capability word, so do it here. */ + new_cpu_data.x86_capability[0] = cpuid_edx(1); + + /* Math is always hard! */ + new_cpu_data.hard_math = 1; + +#ifdef CONFIG_X86_MCE + mce_disabled = 1; +#endif + +#ifdef CONFIG_ACPI + acpi_disabled = 1; + acpi_ht = 0; +#endif + + add_preferred_console("hvc", 0, NULL); + + if (boot->initrd_size) { + /* We stash this at top of memory. */ + INITRD_START = boot->max_pfn*PAGE_SIZE - boot->initrd_size; + INITRD_SIZE = boot->initrd_size; + LOADER_TYPE = 0xFF; + } + + pm_power_off = lguest_power_off; + start_kernel(); +} diff --git a/drivers/lguest/lguest_asm.S b/drivers/lguest/lguest_asm.S new file mode 100644 index 0000000..5ac3d20 --- /dev/null +++ b/drivers/lguest/lguest_asm.S @@ -0,0 +1,53 @@ +#include <linux/linkage.h> +#include <linux/lguest.h> +#include <asm/asm-offsets.h> +#include <asm/thread_info.h> + +/* FIXME: Once asm/processor-flags.h goes in, include that */ +#define X86_EFLAGS_IF 0x00000200 + +/* + * This is where we begin: we have a magic signature which the launcher looks + * for. The plan is that the Linux boot protocol will be extended with a + * "platform type" field which will guide us here from the normal entry point, + * but for the moment this suffices. + * + * We put it in .init.text will be discarded after boot. + */ +.section .init.text, "ax", @progbits +.ascii "GenuineLguest" + /* Set up initial stack. */ + movl $(init_thread_union+THREAD_SIZE),%esp + jmp lguest_init + +/* The templates for inline patching. */ +#define LGUEST_PATCH(name, insns...) \ + lgstart_##name: insns; lgend_##name:; \ + .globl lgstart_##name; .globl lgend_##name + +LGUEST_PATCH(cli, movl $0, lguest_data+LGUEST_DATA_irq_enabled) +LGUEST_PATCH(sti, movl $X86_EFLAGS_IF, lguest_data+LGUEST_DATA_irq_enabled) +LGUEST_PATCH(popf, movl %eax, lguest_data+LGUEST_DATA_irq_enabled) +LGUEST_PATCH(pushf, movl lguest_data+LGUEST_DATA_irq_enabled, %eax) + +.text +/* These demark the EIP range where host should never deliver interrupts. */ +.global lguest_noirq_start +.global lguest_noirq_end + +/* + * We move eflags word to lguest_data.irq_enabled to restore interrupt state. + * For page faults, gpfs and virtual interrupts, the hypervisor has saved + * eflags manually, otherwise it was delivered directly and so eflags reflects + * the real machine IF state, ie. interrupts on. Since the kernel always dies + * if it takes such a trap with interrupts disabled anyway, turning interrupts + * back on unconditionally here is OK. + */ +ENTRY(lguest_iret) + pushl %eax + movl 12(%esp), %eax +lguest_noirq_start: + movl %eax,%ss:lguest_data+LGUEST_DATA_irq_enabled + popl %eax + iret +lguest_noirq_end: diff --git a/drivers/lguest/lguest_bus.c b/drivers/lguest/lguest_bus.c new file mode 100644 index 0000000..18d6ab2 --- /dev/null +++ b/drivers/lguest/lguest_bus.c @@ -0,0 +1,148 @@ +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/lguest_bus.h> +#include <asm/io.h> + +static ssize_t type_show(struct device *_dev, + struct device_attribute *attr, char *buf) +{ + struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); + return sprintf(buf, "%hu", lguest_devices[dev->index].type); +} +static ssize_t features_show(struct device *_dev, + struct device_attribute *attr, char *buf) +{ + struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); + return sprintf(buf, "%hx", lguest_devices[dev->index].features); +} +static ssize_t pfn_show(struct device *_dev, + struct device_attribute *attr, char *buf) +{ + struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); + return sprintf(buf, "%u", lguest_devices[dev->index].pfn); +} +static ssize_t status_show(struct device *_dev, + struct device_attribute *attr, char *buf) +{ + struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); + return sprintf(buf, "%hx", lguest_devices[dev->index].status); +} +static ssize_t status_store(struct device *_dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); + if (sscanf(buf, "%hi", &lguest_devices[dev->index].status) != 1) + return -EINVAL; + return count; +} +static struct device_attribute lguest_dev_attrs[] = { + __ATTR_RO(type), + __ATTR_RO(features), + __ATTR_RO(pfn), + __ATTR(status, 0644, status_show, status_store), + __ATTR_NULL +}; + +static int lguest_dev_match(struct device *_dev, struct device_driver *_drv) +{ + struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); + struct lguest_driver *drv = container_of(_drv,struct lguest_driver,drv); + + return (drv->device_type == lguest_devices[dev->index].type); +} + +struct lguest_bus { + struct bus_type bus; + struct device dev; +}; + +static struct lguest_bus lguest_bus = { + .bus = { + .name = "lguest", + .match = lguest_dev_match, + .dev_attrs = lguest_dev_attrs, + }, + .dev = { + .parent = NULL, + .bus_id = "lguest", + } +}; + +static int lguest_dev_probe(struct device *_dev) +{ + int ret; + struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); + struct lguest_driver *drv = container_of(dev->dev.driver, + struct lguest_driver, drv); + + lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER; + ret = drv->probe(dev); + if (ret == 0) + lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER_OK; + return ret; +} + +int register_lguest_driver(struct lguest_driver *drv) +{ + if (!lguest_devices) + return 0; + + drv->drv.bus = &lguest_bus.bus; + drv->drv.name = drv->name; + drv->drv.owner = drv->owner; + drv->drv.probe = lguest_dev_probe; + + return driver_register(&drv->drv); +} +EXPORT_SYMBOL_GPL(register_lguest_driver); + +static void add_lguest_device(unsigned int index) +{ + struct lguest_device *new; + + lguest_devices[index].status |= LGUEST_DEVICE_S_ACKNOWLEDGE; + new = kmalloc(sizeof(struct lguest_device), GFP_KERNEL); + if (!new) { + printk(KERN_EMERG "Cannot allocate lguest device %u\n", index); + lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED; + return; + } + + new->index = index; + new->private = NULL; + memset(&new->dev, 0, sizeof(new->dev)); + new->dev.parent = &lguest_bus.dev; + new->dev.bus = &lguest_bus.bus; + sprintf(new->dev.bus_id, "%u", index); + if (device_register(&new->dev) != 0) { + printk(KERN_EMERG "Cannot register lguest device %u\n", index); + lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED; + kfree(new); + } +} + +static void scan_devices(void) +{ + unsigned int i; + + for (i = 0; i < LGUEST_MAX_DEVICES; i++) + if (lguest_devices[i].type) + add_lguest_device(i); +} + +static int __init lguest_bus_init(void) +{ + if (strcmp(paravirt_ops.name, "lguest") != 0) + return 0; + + /* Devices are in page above top of "normal" mem. */ + lguest_devices = lguest_map(max_pfn<<PAGE_SHIFT, 1); + + if (bus_register(&lguest_bus.bus) != 0 + || device_register(&lguest_bus.dev) != 0) + panic("lguest bus registration failed"); + + scan_devices(); + return 0; +} +postcore_initcall(lguest_bus_init); diff --git a/include/linux/lguest.h b/include/linux/lguest.h new file mode 100644 index 0000000..f30c04f --- /dev/null +++ b/include/linux/lguest.h @@ -0,0 +1,85 @@ +/* Things the lguest guest needs to know. Note: like all lguest interfaces, + * this is subject to wild and random change between versions. */ +#ifndef _ASM_LGUEST_H +#define _ASM_LGUEST_H + +/* These are randomly chosen numbers which indicate we're an lguest at boot */ +#define LGUEST_MAGIC_EBP 0x4C687970 +#define LGUEST_MAGIC_EDI 0x652D4D65 +#define LGUEST_MAGIC_ESI 0xFFFFFFFF + +#ifndef __ASSEMBLY__ +#include <asm/irq.h> + +#define LHCALL_FLUSH_ASYNC 0 +#define LHCALL_LGUEST_INIT 1 +#define LHCALL_CRASH 2 +#define LHCALL_LOAD_GDT 3 +#define LHCALL_NEW_PGTABLE 4 +#define LHCALL_FLUSH_TLB 5 +#define LHCALL_LOAD_IDT_ENTRY 6 +#define LHCALL_SET_STACK 7 +#define LHCALL_TS 8 +#define LHCALL_TIMER_READ 9 +#define LHCALL_HALT 10 +#define LHCALL_GET_WALLCLOCK 11 +#define LHCALL_BIND_DMA 12 +#define LHCALL_SEND_DMA 13 +#define LHCALL_SET_PTE 14 +#define LHCALL_SET_PMD 15 +#define LHCALL_LOAD_TLS 16 + +#define LGUEST_TRAP_ENTRY 0x1F + +static inline unsigned long +hcall(unsigned long call, + unsigned long arg1, unsigned long arg2, unsigned long arg3) +{ + asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY) + : "=a"(call) + : "a"(call), "d"(arg1), "b"(arg2), "c"(arg3) + : "memory"); + return call; +} + +void async_hcall(unsigned long call, + unsigned long arg1, unsigned long arg2, unsigned long arg3); + +/* Can't use our min() macro here: needs to be a constant */ +#define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32) + +#define LHCALL_RING_SIZE 64 +struct hcall_ring +{ + u32 eax, edx, ebx, ecx; +}; + +/* All the good stuff happens here: guest registers it with LGUEST_INIT */ +struct lguest_data +{ +/* Fields which change during running: */ + /* 512 == enabled (same as eflags) */ + unsigned int irq_enabled; + /* Interrupts blocked by guest. */ + DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS); + + /* Virtual address of page fault. */ + unsigned long cr2; + + /* Async hypercall ring. 0xFF == done, 0 == pending. */ + u8 hcall_status[LHCALL_RING_SIZE]; + struct hcall_ring hcalls[LHCALL_RING_SIZE]; + +/* Fields initialized by the hypervisor at boot: */ + /* Memory not to try to access */ + unsigned long reserve_mem; + /* ID of this guest (used by network driver to set ethernet address) */ + u16 guestid; + +/* Fields initialized by the guest at boot: */ + /* Instruction range to suppress interrupts even if enabled */ + unsigned long noirq_start, noirq_end; +}; +extern struct lguest_data lguest_data; +#endif /* __ASSEMBLY__ */ +#endif /* _ASM_LGUEST_H */ diff --git a/include/linux/lguest_bus.h b/include/linux/lguest_bus.h new file mode 100644 index 0000000..c9b4e05f --- /dev/null +++ b/include/linux/lguest_bus.h @@ -0,0 +1,48 @@ +#ifndef _ASM_LGUEST_DEVICE_H +#define _ASM_LGUEST_DEVICE_H +/* Everything you need to know about lguest devices. */ +#include <linux/device.h> +#include <linux/lguest.h> +#include <linux/lguest_launcher.h> + +struct lguest_device { + /* Unique busid, and index into lguest_page->devices[] */ + unsigned int index; + + struct device dev; + + /* Driver can hang data off here. */ + void *private; +}; + +/* By convention, each device can use irq index+1 if it wants to. */ +static inline int lgdev_irq(const struct lguest_device *dev) +{ + return dev->index + 1; +} + +/* dma args must not be vmalloced! */ +void lguest_send_dma(unsigned long key, struct lguest_dma *dma); +int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas, + unsigned int num, u8 irq); +void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas); + +/* Map the virtual device space */ +void *lguest_map(unsigned long phys_addr, unsigned long pages); +void lguest_unmap(void *); + +struct lguest_driver { + const char *name; + struct module *owner; + u16 device_type; + int (*probe)(struct lguest_device *dev); + void (*remove)(struct lguest_device *dev); + + struct device_driver drv; +}; + +extern int register_lguest_driver(struct lguest_driver *drv); +extern void unregister_lguest_driver(struct lguest_driver *drv); + +extern struct lguest_device_desc *lguest_devices; /* Just past max_pfn */ +#endif /* _ASM_LGUEST_DEVICE_H */ |
