Move i386 part of core.c to x86/core.c.

#include <asm/e820.h>

#include <asm/mce.h>

#include <asm/io.h>

#include <asm/i387.h>

/*G:010 Welcome to the Guest!

 *

lg-y = core.o hypercalls.o page_tables.o interrupts_and_traps.o \

	segments.o io.o lguest_user.o

lg-$(CONFIG_X86_32) += x86/switcher_32.o

lg-$(CONFIG_X86_32) += x86/switcher_32.o x86/core.o

Preparation Preparation!: PREFIX=P

Guest: PREFIX=G

#include <linux/vmalloc.h>

#include <linux/cpu.h>

#include <linux/freezer.h>

#include <linux/highmem.h>

#include <asm/paravirt.h>

#include <asm/desc.h>

#include <asm/pgtable.h>

#include <asm/uaccess.h>

#include <asm/poll.h>

#include <asm/highmem.h>

#include <asm/asm-offsets.h>

#include <asm/i387.h>

#include "lg.h"

/* Found in switcher.S */

extern char start_switcher_text[], end_switcher_text[], switch_to_guest[];

extern unsigned long default_idt_entries[];

/* Every guest maps the core switcher code. */

#define SHARED_SWITCHER_PAGES \

	DIV_ROUND_UP(end_switcher_text - start_switcher_text, PAGE_SIZE)

/* Pages for switcher itself, then two pages per cpu */

#define TOTAL_SWITCHER_PAGES (SHARED_SWITCHER_PAGES + 2 * NR_CPUS)

/* We map at -4M for ease of mapping into the guest (one PTE page). */

#define SWITCHER_ADDR 0xFFC00000

static struct vm_struct *switcher_vma;

static struct page **switcher_page;

static int cpu_had_pge;

static struct {

	unsigned long offset;

	unsigned short segment;

} lguest_entry;

/* This One Big lock protects all inter-guest data structures. */

DEFINE_MUTEX(lguest_lock);

static DEFINE_PER_CPU(struct lguest *, last_guest);

/* Offset from where switcher.S was compiled to where we've copied it */

static unsigned long switcher_offset(void)

{

	return SWITCHER_ADDR - (unsigned long)start_switcher_text;

}

/* This cpu's struct lguest_pages. */

static struct lguest_pages *lguest_pages(unsigned int cpu)

{

	return &(((struct lguest_pages *)

		  (SWITCHER_ADDR + SHARED_SWITCHER_PAGES*PAGE_SIZE))[cpu]);

}

/*H:010 We need to set up the Switcher at a high virtual address.  Remember the

 * Switcher is a few hundred bytes of assembler code which actually changes the

 * Host since it will be running as the switchover occurs.

 *

 * Trying to map memory at a particular address is an unusual thing to do, so

 * it's not a simple one-liner.  We also set up the per-cpu parts of the

 * Switcher here.

 */

 * it's not a simple one-liner. */

static __init int map_switcher(void)

{

	int i, err;

		goto free_vma;

	}

	/* Now the switcher is mapped at the right address, we can't fail!

	 * Copy in the compiled-in Switcher code (from switcher.S). */

	/* Now the Switcher is mapped at the right address, we can't fail!

	 * Copy in the compiled-in Switcher code (from <arch>_switcher.S). */

	memcpy(switcher_vma->addr, start_switcher_text,

	       end_switcher_text - start_switcher_text);

	/* Most of the switcher.S doesn't care that it's been moved; on Intel,

	 * jumps are relative, and it doesn't access any references to external

	 * code or data.

	 *

	 * The only exception is the interrupt handlers in switcher.S: their

	 * addresses are placed in a table (default_idt_entries), so we need to

	 * update the table with the new addresses.  switcher_offset() is a

	 * convenience function which returns the distance between the builtin

	 * switcher code and the high-mapped copy we just made. */

	for (i = 0; i < IDT_ENTRIES; i++)

		default_idt_entries[i] += switcher_offset();

	/*

	 * Set up the Switcher's per-cpu areas.

	 *

	 * Each CPU gets two pages of its own within the high-mapped region

	 * (aka. "struct lguest_pages").  Much of this can be initialized now,

	 * but some depends on what Guest we are running (which is set up in

	 * copy_in_guest_info()).

	 */

	for_each_possible_cpu(i) {

		/* lguest_pages() returns this CPU's two pages. */

		struct lguest_pages *pages = lguest_pages(i);

		/* This is a convenience pointer to make the code fit one

		 * statement to a line. */

		struct lguest_ro_state *state = &pages->state;

		/* The Global Descriptor Table: the Host has a different one

		 * for each CPU.  We keep a descriptor for the GDT which says

		 * where it is and how big it is (the size is actually the last

		 * byte, not the size, hence the "-1"). */

		state->host_gdt_desc.size = GDT_SIZE-1;

		state->host_gdt_desc.address = (long)get_cpu_gdt_table(i);

		/* All CPUs on the Host use the same Interrupt Descriptor

		 * Table, so we just use store_idt(), which gets this CPU's IDT

		 * descriptor. */

		store_idt(&state->host_idt_desc);

		/* The descriptors for the Guest's GDT and IDT can be filled

		 * out now, too.  We copy the GDT & IDT into ->guest_gdt and

		 * ->guest_idt before actually running the Guest. */

		state->guest_idt_desc.size = sizeof(state->guest_idt)-1;

		state->guest_idt_desc.address = (long)&state->guest_idt;

		state->guest_gdt_desc.size = sizeof(state->guest_gdt)-1;

		state->guest_gdt_desc.address = (long)&state->guest_gdt;

		/* We know where we want the stack to be when the Guest enters

		 * the switcher: in pages->regs.  The stack grows upwards, so

		 * we start it at the end of that structure. */

		state->guest_tss.esp0 = (long)(&pages->regs + 1);

		/* And this is the GDT entry to use for the stack: we keep a

		 * couple of special LGUEST entries. */

		state->guest_tss.ss0 = LGUEST_DS;

		/* x86 can have a finegrained bitmap which indicates what I/O

		 * ports the process can use.  We set it to the end of our

		 * structure, meaning "none". */

		state->guest_tss.io_bitmap_base = sizeof(state->guest_tss);

		/* Some GDT entries are the same across all Guests, so we can

		 * set them up now. */

		setup_default_gdt_entries(state);

		/* Most IDT entries are the same for all Guests, too.*/

		setup_default_idt_entries(state, default_idt_entries);

		/* The Host needs to be able to use the LGUEST segments on this

		 * CPU, too, so put them in the Host GDT. */

		get_cpu_gdt_table(i)[GDT_ENTRY_LGUEST_CS] = FULL_EXEC_SEGMENT;

		get_cpu_gdt_table(i)[GDT_ENTRY_LGUEST_DS] = FULL_SEGMENT;

	}

	/* In the Switcher, we want the %cs segment register to use the

	 * LGUEST_CS GDT entry: we've put that in the Host and Guest GDTs, so

	 * it will be undisturbed when we switch.  To change %cs and jump we

	 * need this structure to feed to Intel's "lcall" instruction. */

	lguest_entry.offset = (long)switch_to_guest + switcher_offset();

	lguest_entry.segment = LGUEST_CS;

	printk(KERN_INFO "lguest: mapped switcher at %p\n",

	       switcher_vma->addr);

	/* And we succeeded... */

		__free_pages(switcher_page[i], 0);

}

/*H:130 Our Guest is usually so well behaved; it never tries to do things it

 * isn't allowed to.  Unfortunately, Linux's paravirtual infrastructure isn't

 * quite complete, because it doesn't contain replacements for the Intel I/O

 * instructions.  As a result, the Guest sometimes fumbles across one during

 * the boot process as it probes for various things which are usually attached

 * to a PC.

 *

 * When the Guest uses one of these instructions, we get trap #13 (General

 * Protection Fault) and come here.  We see if it's one of those troublesome

 * instructions and skip over it.  We return true if we did. */

static int emulate_insn(struct lguest *lg)

{

	u8 insn;

	unsigned int insnlen = 0, in = 0, shift = 0;

	/* The eip contains the *virtual* address of the Guest's instruction:

	 * guest_pa just subtracts the Guest's page_offset. */

	unsigned long physaddr = guest_pa(lg, lg->regs->eip);

	/* The guest_pa() function only works for Guest kernel addresses, but

	 * that's all we're trying to do anyway. */

	if (lg->regs->eip < lg->page_offset)

		return 0;

	/* Decoding x86 instructions is icky. */

	lgread(lg, &insn, physaddr, 1);

	/* 0x66 is an "operand prefix".  It means it's using the upper 16 bits

	   of the eax register. */

	if (insn == 0x66) {

		shift = 16;

		/* The instruction is 1 byte so far, read the next byte. */

		insnlen = 1;

		lgread(lg, &insn, physaddr + insnlen, 1);

	}

	/* We can ignore the lower bit for the moment and decode the 4 opcodes

	 * we need to emulate. */

	switch (insn & 0xFE) {

	case 0xE4: /* in     <next byte>,%al */

		insnlen += 2;

		in = 1;

		break;

	case 0xEC: /* in     (%dx),%al */

		insnlen += 1;

		in = 1;

		break;

	case 0xE6: /* out    %al,<next byte> */

		insnlen += 2;

		break;

	case 0xEE: /* out    %al,(%dx) */

		insnlen += 1;

		break;

	default:

		/* OK, we don't know what this is, can't emulate. */

		return 0;

	}

	/* If it was an "IN" instruction, they expect the result to be read

	 * into %eax, so we change %eax.  We always return all-ones, which

	 * traditionally means "there's nothing there". */

	if (in) {

		/* Lower bit tells is whether it's a 16 or 32 bit access */

		if (insn & 0x1)

			lg->regs->eax = 0xFFFFFFFF;

		else

			lg->regs->eax |= (0xFFFF << shift);

	}

	/* Finally, we've "done" the instruction, so move past it. */

	lg->regs->eip += insnlen;

	/* Success! */

	return 1;

}

/*:*/

/*L:305

 * Dealing With Guest Memory.

 *

}

/* (end of memory access helper routines) :*/

static void set_ts(void)

{

	u32 cr0;

	cr0 = read_cr0();

	if (!(cr0 & 8))

		write_cr0(cr0|8);

}

/*S:010

 * We are getting close to the Switcher.

 *

 * Remember that each CPU has two pages which are visible to the Guest when it

 * runs on that CPU.  This has to contain the state for that Guest: we copy the

 * state in just before we run the Guest.

 *

 * Each Guest has "changed" flags which indicate what has changed in the Guest

 * since it last ran.  We saw this set in interrupts_and_traps.c and

 * segments.c.

 */

static void copy_in_guest_info(struct lguest *lg, struct lguest_pages *pages)

{

	/* Copying all this data can be quite expensive.  We usually run the

	 * same Guest we ran last time (and that Guest hasn't run anywhere else

	 * meanwhile).  If that's not the case, we pretend everything in the

	 * Guest has changed. */

	if (__get_cpu_var(last_guest) != lg || lg->last_pages != pages) {

		__get_cpu_var(last_guest) = lg;

		lg->last_pages = pages;

		lg->changed = CHANGED_ALL;

	}

	/* These copies are pretty cheap, so we do them unconditionally: */

	/* Save the current Host top-level page directory. */

	pages->state.host_cr3 = __pa(current->mm->pgd);

	/* Set up the Guest's page tables to see this CPU's pages (and no

	 * other CPU's pages). */

	map_switcher_in_guest(lg, pages);

	/* Set up the two "TSS" members which tell the CPU what stack to use

	 * for traps which do directly into the Guest (ie. traps at privilege

	 * level 1). */

	pages->state.guest_tss.esp1 = lg->esp1;

	pages->state.guest_tss.ss1 = lg->ss1;

	/* Copy direct-to-Guest trap entries. */

	if (lg->changed & CHANGED_IDT)

		copy_traps(lg, pages->state.guest_idt, default_idt_entries);

	/* Copy all GDT entries which the Guest can change. */

	if (lg->changed & CHANGED_GDT)

		copy_gdt(lg, pages->state.guest_gdt);

	/* If only the TLS entries have changed, copy them. */

	else if (lg->changed & CHANGED_GDT_TLS)

		copy_gdt_tls(lg, pages->state.guest_gdt);

	/* Mark the Guest as unchanged for next time. */

	lg->changed = 0;

}

/* Finally: the code to actually call into the Switcher to run the Guest. */

static void run_guest_once(struct lguest *lg, struct lguest_pages *pages)

{

	/* This is a dummy value we need for GCC's sake. */

	unsigned int clobber;

	/* Copy the guest-specific information into this CPU's "struct

	 * lguest_pages". */

	copy_in_guest_info(lg, pages);

	/* Set the trap number to 256 (impossible value).  If we fault while

	 * switching to the Guest (bad segment registers or bug), this will

	 * cause us to abort the Guest. */

	lg->regs->trapnum = 256;

	/* Now: we push the "eflags" register on the stack, then do an "lcall".

	 * This is how we change from using the kernel code segment to using

	 * the dedicated lguest code segment, as well as jumping into the

	 * Switcher.

	 *

	 * The lcall also pushes the old code segment (KERNEL_CS) onto the

	 * stack, then the address of this call.  This stack layout happens to

	 * exactly match the stack of an interrupt... */

	asm volatile("pushf; lcall *lguest_entry"

		     /* This is how we tell GCC that %eax ("a") and %ebx ("b")

		      * are changed by this routine.  The "=" means output. */

		     : "=a"(clobber), "=b"(clobber)

		     /* %eax contains the pages pointer.  ("0" refers to the

		      * 0-th argument above, ie "a").  %ebx contains the

		      * physical address of the Guest's top-level page

		      * directory. */

		     : "0"(pages), "1"(__pa(lg->pgdirs[lg->pgdidx].pgdir))

		     /* We tell gcc that all these registers could change,

		      * which means we don't have to save and restore them in

		      * the Switcher. */

		     : "memory", "%edx", "%ecx", "%edi", "%esi");

}

/*:*/

/*H:030 Let's jump straight to the the main loop which runs the Guest.

 * Remember, this is called by the Launcher reading /dev/lguest, and we keep

 * going around and around until something interesting happens. */

{

	/* We stop running once the Guest is dead. */

	while (!lg->dead) {

		/* We need to initialize this, otherwise gcc complains.  It's

		 * not (yet) clever enough to see that it's initialized when we

		 * need it. */

		unsigned int cr2 = 0; /* Damn gcc */

		/* First we run any hypercalls the Guest wants done: either in

		 * the hypercall ring in "struct lguest_data", or directly by

		 * using int 31 (LGUEST_TRAP_ENTRY). */

		 * the "Do Not Disturb" sign: */

		local_irq_disable();

		/* Remember the awfully-named TS bit?  If the Guest has asked

		 * to set it we set it now, so we can trap and pass that trap

		 * to the Guest if it uses the FPU. */

		if (lg->ts)

			set_ts();

		/* SYSENTER is an optimized way of doing system calls.  We

		 * can't allow it because it always jumps to privilege level 0.

		 * A normal Guest won't try it because we don't advertise it in

		 * CPUID, but a malicious Guest (or malicious Guest userspace

		 * program) could, so we tell the CPU to disable it before

		 * running the Guest. */

		if (boot_cpu_has(X86_FEATURE_SEP))

			wrmsr(MSR_IA32_SYSENTER_CS, 0, 0);

		/* Now we actually run the Guest.  It will pop back out when

		 * something interesting happens, and we can examine its

		 * registers to see what it was doing. */

		run_guest_once(lg, lguest_pages(raw_smp_processor_id()));

		/* The "regs" pointer contains two extra entries which are not

		 * really registers: a trap number which says what interrupt or

		 * trap made the switcher code come back, and an error code

		 * which some traps set.  */

		/* If the Guest page faulted, then the cr2 register will tell

		 * us the bad virtual address.  We have to grab this now,

		 * because once we re-enable interrupts an interrupt could

		 * fault and thus overwrite cr2, or we could even move off to a

		 * different CPU. */

		if (lg->regs->trapnum == 14)

			cr2 = read_cr2();

		/* Similarly, if we took a trap because the Guest used the FPU,

		 * we have to restore the FPU it expects to see. */

		else if (lg->regs->trapnum == 7)

			math_state_restore();

		/* Restore SYSENTER if it's supposed to be on. */

		if (boot_cpu_has(X86_FEATURE_SEP))

			wrmsr(MSR_IA32_SYSENTER_CS, __KERNEL_CS, 0);

		/* Actually run the Guest until something happens. */

		lguest_arch_run_guest(lg);

		/* Now we're ready to be interrupted or moved to other CPUs */

		local_irq_enable();

		/* OK, so what happened? */

		switch (lg->regs->trapnum) {

		case 13: /* We've intercepted a GPF. */

			/* Check if this was one of those annoying IN or OUT

			 * instructions which we need to emulate.  If so, we

			 * just go back into the Guest after we've done it. */

			if (lg->regs->errcode == 0) {

				if (emulate_insn(lg))

					continue;

			}

			break;

		case 14: /* We've intercepted a page fault. */

			/* The Guest accessed a virtual address that wasn't

			 * mapped.  This happens a lot: we don't actually set

			 * up most of the page tables for the Guest at all when

			 * we start: as it runs it asks for more and more, and

			 * we set them up as required. In this case, we don't

			 * even tell the Guest that the fault happened.

			 *

			 * The errcode tells whether this was a read or a

			 * write, and whether kernel or userspace code. */

			if (demand_page(lg, cr2, lg->regs->errcode))

				continue;

			/* OK, it's really not there (or not OK): the Guest

			 * needs to know.  We write out the cr2 value so it

			 * knows where the fault occurred.

			 *

			 * Note that if the Guest were really messed up, this

			 * could happen before it's done the INITIALIZE

			 * hypercall, so lg->lguest_data will be NULL */

			if (lg->lguest_data

			    && put_user(cr2, &lg->lguest_data->cr2))

				kill_guest(lg, "Writing cr2");

			break;

		case 7: /* We've intercepted a Device Not Available fault. */

			/* If the Guest doesn't want to know, we already

			 * restored the Floating Point Unit, so we just

			 * continue without telling it. */

			if (!lg->ts)

				continue;

			break;

		case 32 ... 255:

			/* These values mean a real interrupt occurred, in

			 * which case the Host handler has already been run.

			 * We just do a friendly check if another process

			 * should now be run, then fall through to loop

			 * around: */

			cond_resched();

		case LGUEST_TRAP_ENTRY: /* Handled at top of loop */

			continue;

		/* Now we deal with whatever happened to the Guest. */

		lguest_arch_handle_trap(lg);

	}

		/* If we get here, it's a trap the Guest wants to know

		 * about. */

		if (deliver_trap(lg, lg->regs->trapnum))

			continue;

		/* If the Guest doesn't have a handler (either it hasn't

		 * registered any yet, or it's one of the faults we don't let

		 * it handle), it dies with a cryptic error message. */

		kill_guest(lg, "unhandled trap %li at %#lx (%#lx)",

			   lg->regs->trapnum, lg->regs->eip,

			   lg->regs->trapnum == 14 ? cr2 : lg->regs->errcode);

	}

	/* The Guest is dead => "No such file or directory" */

	return -ENOENT;

}

/* Now we can look at each of the routines this calls, in increasing order of

 * complexity: do_hypercalls(), emulate_insn(), maybe_do_interrupt(),

 * deliver_trap() and demand_page().  After all those, we'll be ready to

 * examine the Switcher, and our philosophical understanding of the Host/Guest

 * duality will be complete. :*/

static void adjust_pge(void *on)

{

	if (on)

		write_cr4(read_cr4() | X86_CR4_PGE);

	else

		write_cr4(read_cr4() & ~X86_CR4_PGE);

}

/*H:000

 * Welcome to the Host!

 *

		return err;

	}

	/* Finally, we need to turn off "Page Global Enable".  PGE is an

	 * optimization where page table entries are specially marked to show

	 * they never change.  The Host kernel marks all the kernel pages this

	 * way because it's always present, even when userspace is running.

	 *

	 * Lguest breaks this: unbeknownst to the rest of the Host kernel, we

	 * switch to the Guest kernel.  If you don't disable this on all CPUs,

	 * you'll get really weird bugs that you'll chase for two days.

	 *

	 * I used to turn PGE off every time we switched to the Guest and back

	 * on when we return, but that slowed the Switcher down noticibly. */

	/* We don't need the complexity of CPUs coming and going while we're

	 * doing this. */

	lock_cpu_hotplug();

	if (cpu_has_pge) { /* We have a broader idea of "global". */

		/* Remember that this was originally set (for cleanup). */

		cpu_had_pge = 1;

		/* adjust_pge is a helper function which sets or unsets the PGE

		 * bit on its CPU, depending on the argument (0 == unset). */

		on_each_cpu(adjust_pge, (void *)0, 0, 1);

		/* Turn off the feature in the global feature set. */

		clear_bit(X86_FEATURE_PGE, boot_cpu_data.x86_capability);

	}

	unlock_cpu_hotplug();

	/* Finally we do some architecture-specific setup. */

	lguest_arch_host_init();

	/* All good! */

	return 0;

	free_pagetables();

	unmap_switcher();

	/* If we had PGE before we started, turn it back on now. */

	lock_cpu_hotplug();

	if (cpu_had_pge) {

		set_bit(X86_FEATURE_PGE, boot_cpu_data.x86_capability);

		/* adjust_pge's argument "1" means set PGE. */

		on_each_cpu(adjust_pge, (void *)1, 0, 1);

	}

	unlock_cpu_hotplug();

	lguest_arch_host_fini();

}

/*:*/

/* The Host side of lguest can be a module.  This is a nice way for people to

 * play with it.  */

	/* Look at the IDT entry the Guest gave us for this interrupt.  The

	 * first 32 (FIRST_EXTERNAL_VECTOR) entries are for traps, so we skip

	 * over them. */

	idt = &lg->idt[FIRST_EXTERNAL_VECTOR+irq];

	idt = &lg->arch.idt[FIRST_EXTERNAL_VECTOR+irq];

	/* If they don't have a handler (yet?), we just ignore it */

	if (idt_present(idt->a, idt->b)) {

		/* OK, mark it no longer pending and deliver it. */

{

	/* Trap numbers are always 8 bit, but we set an impossible trap number

	 * for traps inside the Switcher, so check that here. */

	if (num >= ARRAY_SIZE(lg->idt))

	if (num >= ARRAY_SIZE(lg->arch.idt))

		return 0;

	/* Early on the Guest hasn't set the IDT entries (or maybe it put a

	 * bogus one in): if we fail here, the Guest will be killed. */

	if (!idt_present(lg->idt[num].a, lg->idt[num].b))

	if (!idt_present(lg->arch.idt[num].a, lg->arch.idt[num].b))

		return 0;

	set_guest_interrupt(lg, lg->idt[num].a, lg->idt[num].b, has_err(num));

	set_guest_interrupt(lg, lg->arch.idt[num].a, lg->arch.idt[num].b, has_err(num));

	return 1;

}

	lg->changed |= CHANGED_IDT;

	/* Check that the Guest doesn't try to step outside the bounds. */

	if (num >= ARRAY_SIZE(lg->idt))

	if (num >= ARRAY_SIZE(lg->arch.idt))

		kill_guest(lg, "Setting idt entry %u", num);

	else

		set_trap(lg, &lg->idt[num], num, lo, hi);

		set_trap(lg, &lg->arch.idt[num], num, lo, hi);

}

/* The default entry for each interrupt points into the Switcher routines which

	/* We can simply copy the direct traps, otherwise we use the default

	 * ones in the Switcher: they will return to the Host. */

	for (i = 0; i < ARRAY_SIZE(lg->idt); i++) {

	for (i = 0; i < ARRAY_SIZE(lg->arch.idt); i++) {

		/* If no Guest can ever override this trap, leave it alone. */

		if (!direct_trap(i))

			continue;

		 * Interrupt gates (type 14) disable interrupts as they are

		 * entered, which we never let the Guest do.  Not present

		 * entries (type 0x0) also can't go direct, of course. */

		if (idt_type(lg->idt[i].a, lg->idt[i].b) == 0xF)

			idt[i] = lg->idt[i];

		if (idt_type(lg->arch.idt[i].a, lg->arch.idt[i].b) == 0xF)

			idt[i] = lg->arch.idt[i];

		else

			/* Reset it to the default. */

			default_idt_entry(&idt[i], i, def[i]);

#ifndef _LGUEST_H

#define _LGUEST_H

#include <asm/desc.h>

#define GDT_ENTRY_LGUEST_CS	10

#define GDT_ENTRY_LGUEST_DS	11

#define LGUEST_CS		(GDT_ENTRY_LGUEST_CS * 8)

#define LGUEST_DS		(GDT_ENTRY_LGUEST_DS * 8)

#ifndef __ASSEMBLY__

#include <linux/types.h>

#include <linux/init.h>

#include <linux/wait.h>

#include <linux/err.h>

#include <asm/semaphore.h>

#include "irq_vectors.h"

#define GUEST_PL 1

struct lguest_regs

{

	/* Manually saved part. */

	unsigned long ebx, ecx, edx;

	unsigned long esi, edi, ebp;

	unsigned long gs;

	unsigned long eax;

	unsigned long fs, ds, es;

	unsigned long trapnum, errcode;

	/* Trap pushed part */

	unsigned long eip;

	unsigned long cs;

	unsigned long eflags;

	unsigned long esp;

	unsigned long ss;

};

#include <asm/lguest.h>

void free_pagetables(void);

int init_pagetables(struct page **switcher_page, unsigned int pages);

/* Full 4G segment descriptors, suitable for CS and DS. */

#define FULL_EXEC_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9b00})

#define FULL_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9300})

struct lguest_dma_info

{

	struct list_head list;

	spgd_t *pgdir;

};

/* This is a guest-specific page (mapped ro) into the guest. */

struct lguest_ro_state

{

	/* Host information we need to restore when we switch back. */

	u32 host_cr3;

	struct Xgt_desc_struct host_idt_desc;

	struct Xgt_desc_struct host_gdt_desc;

	u32 host_sp;

	/* Fields which are used when guest is running. */

	struct Xgt_desc_struct guest_idt_desc;

	struct Xgt_desc_struct guest_gdt_desc;

	struct i386_hw_tss guest_tss;

	struct desc_struct guest_idt[IDT_ENTRIES];

	struct desc_struct guest_gdt[GDT_ENTRIES];

};

/* We have two pages shared with guests, per cpu.  */

struct lguest_pages

{

	/* Dead? */

	const char *dead;

	/* The GDT entries copied into lguest_ro_state when running. */

	struct desc_struct gdt[GDT_ENTRIES];

	/* The IDT entries: some copied into lguest_ro_state when running. */

	struct desc_struct idt[IDT_ENTRIES];

	struct lguest_arch arch;

	/* Virtual clock device */

	struct hrtimer hrt;

int demand_page(struct lguest *info, unsigned long cr2, int errcode);

void pin_page(struct lguest *lg, unsigned long vaddr);

/* <arch>/core.c: */

void lguest_arch_host_init(void);

void lguest_arch_host_fini(void);

void lguest_arch_run_guest(struct lguest *lg);

void lguest_arch_handle_trap(struct lguest *lg);

/* <arch>/switcher.S: */

extern char start_switcher_text[], end_switcher_text[], switch_to_guest[];

/* lguest_user.c: */

int lguest_device_init(void);

void lguest_device_remove(void);