mirror of
https://github.com/torvalds/linux.git
synced 2024-11-12 15:11:50 +00:00
e2a81baf66
64-bit Xen supports sysenter for 32-bit guests, so support its use. (sysenter is faster than int $0x80 in 32-on-64.) sysexit is still not supported, so we fake it up using iret. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
|
|
* Machine specific setup for xen
|
|
*
|
|
* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/pm.h>
|
|
|
|
#include <asm/elf.h>
|
|
#include <asm/vdso.h>
|
|
#include <asm/e820.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/xen/hypervisor.h>
|
|
#include <asm/xen/hypercall.h>
|
|
|
|
#include <xen/interface/callback.h>
|
|
#include <xen/interface/physdev.h>
|
|
#include <xen/features.h>
|
|
|
|
#include "xen-ops.h"
|
|
#include "vdso.h"
|
|
|
|
/* These are code, but not functions. Defined in entry.S */
|
|
extern const char xen_hypervisor_callback[];
|
|
extern const char xen_failsafe_callback[];
|
|
|
|
unsigned long *phys_to_machine_mapping;
|
|
EXPORT_SYMBOL(phys_to_machine_mapping);
|
|
|
|
/**
|
|
* machine_specific_memory_setup - Hook for machine specific memory setup.
|
|
**/
|
|
|
|
char * __init xen_memory_setup(void)
|
|
{
|
|
unsigned long max_pfn = xen_start_info->nr_pages;
|
|
|
|
e820.nr_map = 0;
|
|
add_memory_region(0, LOWMEMSIZE(), E820_RAM);
|
|
add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
|
|
|
|
return "Xen";
|
|
}
|
|
|
|
static void xen_idle(void)
|
|
{
|
|
local_irq_disable();
|
|
|
|
if (need_resched())
|
|
local_irq_enable();
|
|
else {
|
|
current_thread_info()->status &= ~TS_POLLING;
|
|
smp_mb__after_clear_bit();
|
|
safe_halt();
|
|
current_thread_info()->status |= TS_POLLING;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set the bit indicating "nosegneg" library variants should be used.
|
|
*/
|
|
static void __init fiddle_vdso(void)
|
|
{
|
|
extern const char vdso32_default_start;
|
|
u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
|
|
*mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
|
|
}
|
|
|
|
void xen_enable_sysenter(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
extern void xen_sysenter_target(void);
|
|
/* Mask events on entry, even though they get enabled immediately */
|
|
static struct callback_register sysenter = {
|
|
.type = CALLBACKTYPE_sysenter,
|
|
.address = { __KERNEL_CS, (unsigned long)xen_sysenter_target },
|
|
.flags = CALLBACKF_mask_events,
|
|
};
|
|
|
|
if (!boot_cpu_has(X86_FEATURE_SEP) ||
|
|
HYPERVISOR_callback_op(CALLBACKOP_register, &sysenter) != 0) {
|
|
clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP);
|
|
clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP);
|
|
}
|
|
}
|
|
|
|
void __init xen_arch_setup(void)
|
|
{
|
|
struct physdev_set_iopl set_iopl;
|
|
int rc;
|
|
|
|
HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
|
|
HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
|
|
|
|
if (!xen_feature(XENFEAT_auto_translated_physmap))
|
|
HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
|
|
|
|
HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
|
|
__KERNEL_CS, (unsigned long)xen_failsafe_callback);
|
|
|
|
xen_enable_sysenter();
|
|
|
|
set_iopl.iopl = 1;
|
|
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
|
|
if (rc != 0)
|
|
printk(KERN_INFO "physdev_op failed %d\n", rc);
|
|
|
|
#ifdef CONFIG_ACPI
|
|
if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
|
|
printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
|
|
disable_acpi();
|
|
}
|
|
#endif
|
|
|
|
memcpy(boot_command_line, xen_start_info->cmd_line,
|
|
MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
|
|
COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
|
|
|
|
pm_idle = xen_idle;
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* fill cpus_possible with all available cpus */
|
|
xen_fill_possible_map();
|
|
#endif
|
|
|
|
paravirt_disable_iospace();
|
|
|
|
fiddle_vdso();
|
|
}
|