lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

lguest: the host code

Browse Source 
This is the code for the "lg.ko" module, which allows lguest guests to
be launched.

[akpm@linux-foundation.org: update for futex-new-private-futexes]
[akpm@linux-foundation.org: build fix]
[jmorris@namei.org: lguest: use hrtimers]
[akpm@linux-foundation.org: x86_64 build fix]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell
2007-07-19 01:49:23 -07:00
committed by Linus Torvalds
parent 07ad157f6e
commit d7e28ffe6c
17 changed files with 2703 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

127
drivers/lguest/lguest.c
View File

@ -25,6 +25,8 @@
#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/lguest_bus.h>
@ -37,6 +39,7 @@
#include <asm/e820.h>
#include <asm/mce.h>
#include <asm/io.h>
//#include <asm/sched-clock.h>
/* Declarations for definitions in lguest_guest.S */
extern char lguest_noirq_start[], lguest_noirq_end[];
@ -54,7 +57,6 @@ struct lguest_data lguest_data = {
.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)
@ -210,7 +212,7 @@ static void lguest_cpuid(unsigned int *eax, unsigned int *ebx,
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. */
/* SSE, SSE2, FXSR, MMX, CMOV, CMPXCHG8B, FPU. */
*edx &= 0x07808101;
/* Host wants to know when we flush kernel pages: set PGE. */
*edx |= 0x00002000;
@ -346,24 +348,104 @@ 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)
static cycle_t lguest_clock_read(void)
{
do_timer(hcall(LHCALL_TIMER_READ, 0, 0, 0));
update_process_times(user_mode_vm(get_irq_regs()));
if (lguest_data.tsc_khz)
return native_read_tsc();
else
return jiffies;
}
/* This is what we tell the kernel is our clocksource. */
static struct clocksource lguest_clock = {
.name = "lguest",
.rating = 400,
.read = lguest_clock_read,
};
/* We also need a "struct clock_event_device": Linux asks us to set it to go
* off some time in the future. Actually, James Morris figured all this out, I
* just applied the patch. */
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\n",
__FUNCTION__, delta);
return -ETIME;
}
hcall(LHCALL_SET_CLOCKEVENT, delta, 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:
/* A 0 argument shuts the clock down. */
hcall(LHCALL_SET_CLOCKEVENT, 0, 0, 0);
break;
case CLOCK_EVT_MODE_ONESHOT:
/* This is what we expect. */
break;
case CLOCK_EVT_MODE_PERIODIC:
BUG();
}
}
/* This describes our primitive timer chip. */
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,
};
/* This is the Guest timer interrupt handler (hardware interrupt 0). We just
* call the clockevent infrastructure and it does whatever needs doing. */
static void lguest_time_irq(unsigned int irq, struct irq_desc *desc)
{
unsigned long flags;
/* Don't interrupt us while this is running. */
local_irq_save(flags);
lguest_clockevent.event_handler(&lguest_clockevent);
local_irq_restore(flags);
}
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);
/* We use the TSC if the Host tells us we can, otherwise a dumb
* jiffies-based clock. */
if (lguest_data.tsc_khz) {
lguest_clock.shift = 22;
lguest_clock.mult = clocksource_khz2mult(lguest_data.tsc_khz,
lguest_clock.shift);
lguest_clock.mask = CLOCKSOURCE_MASK(64);
lguest_clock.flags = CLOCK_SOURCE_IS_CONTINUOUS;
} else {
/* To understand this, start at kernel/time/jiffies.c... */
lguest_clock.shift = 8;
lguest_clock.mult = (((u64)NSEC_PER_SEC<<8)/ACTHZ) << 8;
lguest_clock.mask = CLOCKSOURCE_MASK(32);
}
clocksource_register(&lguest_clock);
/* We can't set cpumask in the initializer: damn C limitations! */
lguest_clockevent.cpumask = cpumask_of_cpu(0);
clockevents_register_device(&lguest_clockevent);
enable_lguest_irq(0);
}
static void lguest_load_esp0(struct tss_struct *tss,
@ -418,8 +500,7 @@ 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);
add_memory_region(E820_MAP->addr, E820_MAP->size, E820_MAP->type);
return "LGUEST";
}
@ -450,8 +531,13 @@ static unsigned lguest_patch(u8 type, u16 clobber, void *insns, unsigned len)
return insn_len;
}
__init void lguest_init(void)
__init void lguest_init(void *boot)
{
/* Copy boot parameters first. */
memcpy(&boot_params, boot, PARAM_SIZE);
memcpy(boot_command_line, __va(boot_params.hdr.cmd_line_ptr),
COMMAND_LINE_SIZE);
paravirt_ops.name = "lguest";
paravirt_ops.paravirt_enabled = 1;
paravirt_ops.kernel_rpl = 1;
@ -498,10 +584,8 @@ __init void lguest_init(void)
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);
@ -532,13 +616,6 @@ __init void lguest_init(void)
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();
}