[PATCH] paravirt: header and stubs for paravirtualisation

Create a paravirt.h header for all the critical operations which need to be
replaced with hypervisor calls, and include that instead of defining native
operations, when CONFIG_PARAVIRT.

This patch does the dumbest possible replacement of paravirtualized
instructions: calls through a "paravirt_ops" structure.  Currently these are
function implementations of native hardware: hypervisors will override the ops
structure with their own variants.

All the pv-ops functions are declared "fastcall" so that a specific
register-based ABI is used, to make inlining assember easier.

And:

+From: Andy Whitcroft <apw@shadowen.org>

The paravirt ops introduce a 'weak' attribute onto memory_setup().
Code ordering leads to the following warnings on x86:

    arch/i386/kernel/setup.c:651: warning: weak declaration of
                `memory_setup' after first use results in unspecified behavior

Move memory_setup() to avoid this.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>

27 files changed, 890 insertions, 58 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 1f0f7b60995e..bb1fa061c6cf 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -182,6 +182,17 @@ config X86_ES7000
 
 endchoice
 
+config PARAVIRT
+        bool "Paravirtualization support (EXPERIMENTAL)"
+        depends on EXPERIMENTAL
+        help
+          Paravirtualization is a way of running multiple instances of
+          Linux on the same machine, under a hypervisor.  This option
+          changes the kernel so it can modify itself when it is run
+          under a hypervisor, improving performance significantly.
+          However, when run without a hypervisor the kernel is
+          theoretically slower.  If in doubt, say N.
+
 config ACPI_SRAT
         bool
         default y
diff --git a/arch/i386/boot/compressed/misc.c b/arch/i386/boot/compressed/misc.c
index dc1538931555..c6798c75c67d 100644
--- a/arch/i386/boot/compressed/misc.c
+++ b/arch/i386/boot/compressed/misc.c
@@ -9,6 +9,7 @@
  * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
  */
 
+#undef CONFIG_PARAVIRT
 #include <linux/linkage.h>
 #include <linux/vmalloc.h>
 #include <linux/screen_info.h>
diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile
index f614854bd71f..406612136049 100644
--- a/arch/i386/kernel/Makefile
+++ b/arch/i386/kernel/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_VM86)		+= vm86.o
 obj-$(CONFIG_EARLY_PRINTK)      += early_printk.o
 obj-$(CONFIG_HPET_TIMER)        += hpet.o
 obj-$(CONFIG_K8_NB)             += k8.o
+obj-$(CONFIG_PARAVIRT)          += paravirt.o
 
 EXTRA_AFLAGS   := -traditional
 
diff --git a/arch/i386/kernel/asm-offsets.c b/arch/i386/kernel/asm-offsets.c
index 0666eb0ed7bc..1b2f3cd33270 100644
--- a/arch/i386/kernel/asm-offsets.c
+++ b/arch/i386/kernel/asm-offsets.c
@@ -101,4 +101,14 @@ void foo(void)
         BLANK();
         OFFSET(PDA_cpu, i386_pda, cpu_number);
         OFFSET(PDA_pcurrent, i386_pda, pcurrent);
+
+#ifdef CONFIG_PARAVIRT
+        BLANK();
+        OFFSET(PARAVIRT_enabled, paravirt_ops, paravirt_enabled);
+        OFFSET(PARAVIRT_irq_disable, paravirt_ops, irq_disable);
+        OFFSET(PARAVIRT_irq_enable, paravirt_ops, irq_enable);
+        OFFSET(PARAVIRT_irq_enable_sysexit, paravirt_ops, irq_enable_sysexit);
+        OFFSET(PARAVIRT_iret, paravirt_ops, iret);
+        OFFSET(PARAVIRT_read_cr0, paravirt_ops, read_cr0);
+#endif
 }
diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index 0220bc8cbb43..d274612e05cd 100644
--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@@ -62,13 +62,6 @@ DF_MASK		= 0x00000400
 NT_MASK         = 0x00004000
 VM_MASK         = 0x00020000
 
-/* These are replaces for paravirtualization */
-#define DISABLE_INTERRUPTS              cli
-#define ENABLE_INTERRUPTS               sti
-#define ENABLE_INTERRUPTS_SYSEXIT       sti; sysexit
-#define INTERRUPT_RETURN                iret
-#define GET_CR0_INTO_EAX                movl %cr0, %eax
-
 #ifdef CONFIG_PREEMPT
 #define preempt_stop            DISABLE_INTERRUPTS; TRACE_IRQS_OFF
 #else
@@ -416,6 +409,20 @@ ldt_ss:
         jnz restore_nocheck
         testl $0x00400000, %eax         # returning to 32bit stack?
         jnz restore_nocheck             # allright, normal return
+
+#ifdef CONFIG_PARAVIRT
+        /*
+         * The kernel can't run on a non-flat stack if paravirt mode
+         * is active.  Rather than try to fixup the high bits of
+         * ESP, bypass this code entirely.  This may break DOSemu
+         * and/or Wine support in a paravirt VM, although the option
+         * is still available to implement the setting of the high
+         * 16-bits in the INTERRUPT_RETURN paravirt-op.
+         */
+        cmpl $0, paravirt_ops+PARAVIRT_enabled
+        jne restore_nocheck
+#endif
+
         /* If returning to userspace with 16bit stack,
          * try to fix the higher word of ESP, as the CPU
          * won't restore it.
@@ -833,6 +840,19 @@ nmi_espfix_stack:
 .previous
 KPROBE_END(nmi)
 
+#ifdef CONFIG_PARAVIRT
+ENTRY(native_iret)
+1:      iret
+.section __ex_table,"a"
+        .align 4
+        .long 1b,iret_exc
+.previous
+
+ENTRY(native_irq_enable_sysexit)
+        sti
+        sysexit
+#endif
+
 KPROBE_ENTRY(int3)
         RING0_INT_FRAME
         pushl $-1                       # mark this as an int
diff --git a/arch/i386/kernel/i8259.c b/arch/i386/kernel/i8259.c
index 62996cd17084..c8d45821c788 100644
--- a/arch/i386/kernel/i8259.c
+++ b/arch/i386/kernel/i8259.c
@@ -381,7 +381,10 @@ void __init init_ISA_irqs (void)
         }
 }
 
-void __init init_IRQ(void)
+/* Overridden in paravirt.c */
+void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
+
+void __init native_init_IRQ(void)
 {
         int i;
 
diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c
new file mode 100644
index 000000000000..478192cd4b90
--- /dev/null
+++ b/arch/i386/kernel/paravirt.c
@@ -0,0 +1,404 @@
+/*  Paravirtualization interfaces
+    Copyright (C) 2006 Rusty Russell 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.  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/efi.h>
+#include <linux/bcd.h>
+
+#include <asm/bug.h>
+#include <asm/paravirt.h>
+#include <asm/desc.h>
+#include <asm/setup.h>
+#include <asm/arch_hooks.h>
+#include <asm/time.h>
+#include <asm/irq.h>
+#include <asm/delay.h>
+
+/* nop stub */
+static void native_nop(void)
+{
+}
+
+static void __init default_banner(void)
+{
+        printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
+               paravirt_ops.name);
+}
+
+char *memory_setup(void)
+{
+        return paravirt_ops.memory_setup();
+}
+
+static fastcall unsigned long native_get_debugreg(int regno)
+{
+        unsigned long val = 0;  /* Damn you, gcc! */
+
+        switch (regno) {
+        case 0:
+                asm("movl %%db0, %0" :"=r" (val)); break;
+        case 1:
+                asm("movl %%db1, %0" :"=r" (val)); break;
+        case 2:
+                asm("movl %%db2, %0" :"=r" (val)); break;
+        case 3:
+                asm("movl %%db3, %0" :"=r" (val)); break;
+        case 6:
+                asm("movl %%db6, %0" :"=r" (val)); break;
+        case 7:
+                asm("movl %%db7, %0" :"=r" (val)); break;
+        default:
+                BUG();
+        }
+        return val;
+}
+
+static fastcall void native_set_debugreg(int regno, unsigned long value)
+{
+        switch (regno) {
+        case 0:
+                asm("movl %0,%%db0"     : /* no output */ :"r" (value));
+                break;
+        case 1:
+                asm("movl %0,%%db1"     : /* no output */ :"r" (value));
+                break;
+        case 2:
+                asm("movl %0,%%db2"     : /* no output */ :"r" (value));
+                break;
+        case 3:
+                asm("movl %0,%%db3"     : /* no output */ :"r" (value));
+                break;
+        case 6:
+                asm("movl %0,%%db6"     : /* no output */ :"r" (value));
+                break;
+        case 7:
+                asm("movl %0,%%db7"     : /* no output */ :"r" (value));
+                break;
+        default:
+                BUG();
+        }
+}
+
+void init_IRQ(void)
+{
+        paravirt_ops.init_IRQ();
+}
+
+static fastcall void native_clts(void)
+{
+        asm volatile ("clts");
+}
+
+static fastcall unsigned long native_read_cr0(void)
+{
+        unsigned long val;
+        asm volatile("movl %%cr0,%0\n\t" :"=r" (val));
+        return val;
+}
+
+static fastcall void native_write_cr0(unsigned long val)
+{
+        asm volatile("movl %0,%%cr0": :"r" (val));
+}
+
+static fastcall unsigned long native_read_cr2(void)
+{
+        unsigned long val;
+        asm volatile("movl %%cr2,%0\n\t" :"=r" (val));
+        return val;
+}
+
+static fastcall void native_write_cr2(unsigned long val)
+{
+        asm volatile("movl %0,%%cr2": :"r" (val));
+}
+
+static fastcall unsigned long native_read_cr3(void)
+{
+        unsigned long val;
+        asm volatile("movl %%cr3,%0\n\t" :"=r" (val));
+        return val;
+}
+
+static fastcall void native_write_cr3(unsigned long val)
+{
+        asm volatile("movl %0,%%cr3": :"r" (val));
+}
+
+static fastcall unsigned long native_read_cr4(void)
+{
+        unsigned long val;
+        asm volatile("movl %%cr4,%0\n\t" :"=r" (val));
+        return val;
+}
+
+static fastcall unsigned long native_read_cr4_safe(void)
+{
+        unsigned long val;
+        /* This could fault if %cr4 does not exist */
+        asm("1: movl %%cr4, %0          \n"
+                "2:                             \n"
+                ".section __ex_table,\"a\"      \n"
+                ".long 1b,2b                    \n"
+                ".previous                      \n"
+                : "=r" (val): "0" (0));
+        return val;
+}
+
+static fastcall void native_write_cr4(unsigned long val)
+{
+        asm volatile("movl %0,%%cr4": :"r" (val));
+}
+
+static fastcall unsigned long native_save_fl(void)
+{
+        unsigned long f;
+        asm volatile("pushfl ; popl %0":"=g" (f): /* no input */);
+        return f;
+}
+
+static fastcall void native_restore_fl(unsigned long f)
+{
+        asm volatile("pushl %0 ; popfl": /* no output */
+                             :"g" (f)
+                             :"memory", "cc");
+}
+
+static fastcall void native_irq_disable(void)
+{
+        asm volatile("cli": : :"memory");
+}
+
+static fastcall void native_irq_enable(void)
+{
+        asm volatile("sti": : :"memory");
+}
+
+static fastcall void native_safe_halt(void)
+{
+        asm volatile("sti; hlt": : :"memory");
+}
+
+static fastcall void native_halt(void)
+{
+        asm volatile("hlt": : :"memory");
+}
+
+static fastcall void native_wbinvd(void)
+{
+        asm volatile("wbinvd": : :"memory");
+}
+
+static fastcall unsigned long long native_read_msr(unsigned int msr, int *err)
+{
+        unsigned long long val;
+
+        asm volatile("2: rdmsr ; xorl %0,%0\n"
+                     "1:\n\t"
+                     ".section .fixup,\"ax\"\n\t"
+                     "3:  movl %3,%0 ; jmp 1b\n\t"
+                     ".previous\n\t"
+                     ".section __ex_table,\"a\"\n"
+                     "   .align 4\n\t"
+                     "   .long  2b,3b\n\t"
+                     ".previous"
+                     : "=r" (*err), "=A" (val)
+                     : "c" (msr), "i" (-EFAULT));
+
+        return val;
+}
+
+static fastcall int native_write_msr(unsigned int msr, unsigned long long val)
+{
+        int err;
+        asm volatile("2: wrmsr ; xorl %0,%0\n"
+                     "1:\n\t"
+                     ".section .fixup,\"ax\"\n\t"
+                     "3:  movl %4,%0 ; jmp 1b\n\t"
+                     ".previous\n\t"
+                     ".section __ex_table,\"a\"\n"
+                     "   .align 4\n\t"
+                     "   .long  2b,3b\n\t"
+                     ".previous"
+                     : "=a" (err)
+                     : "c" (msr), "0" ((u32)val), "d" ((u32)(val>>32)),
+                       "i" (-EFAULT));
+        return err;
+}
+
+static fastcall unsigned long long native_read_tsc(void)
+{
+        unsigned long long val;
+        asm volatile("rdtsc" : "=A" (val));
+        return val;
+}
+
+static fastcall unsigned long long native_read_pmc(void)
+{
+        unsigned long long val;
+        asm volatile("rdpmc" : "=A" (val));
+        return val;
+}
+
+static fastcall void native_load_tr_desc(void)
+{
+        asm volatile("ltr %w0"::"q" (GDT_ENTRY_TSS*8));
+}
+
+static fastcall void native_load_gdt(const struct Xgt_desc_struct *dtr)
+{
+        asm volatile("lgdt %0"::"m" (*dtr));
+}
+
+static fastcall void native_load_idt(const struct Xgt_desc_struct *dtr)
+{
+        asm volatile("lidt %0"::"m" (*dtr));
+}
+
+static fastcall void native_store_gdt(struct Xgt_desc_struct *dtr)
+{
+        asm ("sgdt %0":"=m" (*dtr));
+}
+
+static fastcall void native_store_idt(struct Xgt_desc_struct *dtr)
+{
+        asm ("sidt %0":"=m" (*dtr));
+}
+
+static fastcall unsigned long native_store_tr(void)
+{
+        unsigned long tr;
+        asm ("str %0":"=r" (tr));
+        return tr;
+}
+
+static fastcall void native_load_tls(struct thread_struct *t, unsigned int cpu)
+{
+#define C(i) get_cpu_gdt_table(cpu)[GDT_ENTRY_TLS_MIN + i] = t->tls_array[i]
+        C(0); C(1); C(2);
+#undef C
+}
+
+static inline void native_write_dt_entry(void *dt, int entry, u32 entry_low, u32 entry_high)
+{
+        u32 *lp = (u32 *)((char *)dt + entry*8);
+        lp[0] = entry_low;
+        lp[1] = entry_high;
+}
+
+static fastcall void native_write_ldt_entry(void *dt, int entrynum, u32 low, u32 high)
+{
+        native_write_dt_entry(dt, entrynum, low, high);
+}
+
+static fastcall void native_write_gdt_entry(void *dt, int entrynum, u32 low, u32 high)
+{
+        native_write_dt_entry(dt, entrynum, low, high);
+}
+
+static fastcall void native_write_idt_entry(void *dt, int entrynum, u32 low, u32 high)
+{
+        native_write_dt_entry(dt, entrynum, low, high);
+}
+
+static fastcall void native_load_esp0(struct tss_struct *tss,
+                                      struct thread_struct *thread)
+{
+        tss->esp0 = thread->esp0;
+
+        /* This can only happen when SEP is enabled, no need to test "SEP"arately */
+        if (unlikely(tss->ss1 != thread->sysenter_cs)) {
+                tss->ss1 = thread->sysenter_cs;
+                wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
+        }
+}
+
+static fastcall void native_io_delay(void)
+{
+        asm volatile("outb %al,$0x80");
+}
+
+/* These are in entry.S */
+extern fastcall void native_iret(void);
+extern fastcall void native_irq_enable_sysexit(void);
+
+static int __init print_banner(void)
+{
+        paravirt_ops.banner();
+        return 0;
+}
+core_initcall(print_banner);
+
+struct paravirt_ops paravirt_ops = {
+        .name = "bare hardware",
+        .paravirt_enabled = 0,
+        .kernel_rpl = 0,
+
+        .banner = default_banner,
+        .arch_setup = native_nop,
+        .memory_setup = machine_specific_memory_setup,
+        .get_wallclock = native_get_wallclock,
+        .set_wallclock = native_set_wallclock,
+        .time_init = time_init_hook,
+        .init_IRQ = native_init_IRQ,
+
+        .cpuid = native_cpuid,
+        .get_debugreg = native_get_debugreg,
+        .set_debugreg = native_set_debugreg,
+        .clts = native_clts,
+        .read_cr0 = native_read_cr0,
+        .write_cr0 = native_write_cr0,
+        .read_cr2 = native_read_cr2,
+        .write_cr2 = native_write_cr2,
+        .read_cr3 = native_read_cr3,
+        .write_cr3 = native_write_cr3,
+        .read_cr4 = native_read_cr4,
+        .read_cr4_safe = native_read_cr4_safe,
+        .write_cr4 = native_write_cr4,
+        .save_fl = native_save_fl,
+        .restore_fl = native_restore_fl,
+        .irq_disable = native_irq_disable,
+        .irq_enable = native_irq_enable,
+        .safe_halt = native_safe_halt,
+        .halt = native_halt,
+        .wbinvd = native_wbinvd,
+        .read_msr = native_read_msr,
+        .write_msr = native_write_msr,
+        .read_tsc = native_read_tsc,
+        .read_pmc = native_read_pmc,
+        .load_tr_desc = native_load_tr_desc,
+        .set_ldt = native_set_ldt,
+        .load_gdt = native_load_gdt,
+        .load_idt = native_load_idt,
+        .store_gdt = native_store_gdt,
+        .store_idt = native_store_idt,
+        .store_tr = native_store_tr,
+        .load_tls = native_load_tls,
+        .write_ldt_entry = native_write_ldt_entry,
+        .write_gdt_entry = native_write_gdt_entry,
+        .write_idt_entry = native_write_idt_entry,
+        .load_esp0 = native_load_esp0,
+
+        .set_iopl_mask = native_set_iopl_mask,
+        .io_delay = native_io_delay,
+        .const_udelay = __const_udelay,
+
+        .irq_enable_sysexit = native_irq_enable_sysexit,
+        .iret = native_iret,
+};
+EXPORT_SYMBOL(paravirt_ops);
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index e5bb87aa5a45..695d53fd14de 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -495,6 +495,12 @@ static void set_mca_bus(int x)
 static void set_mca_bus(int x) { }
 #endif
 
+/* Overridden in paravirt.c if CONFIG_PARAVIRT */
+char * __attribute__((weak)) memory_setup(void)
+{
+        return machine_specific_memory_setup();
+}
+
 /*
  * Determine if we were loaded by an EFI loader.  If so, then we have also been
  * passed the efi memmap, systab, etc., so we should use these data structures
@@ -547,7 +553,7 @@ void __init setup_arch(char **cmdline_p)
                 efi_init();
         else {
                 printk(KERN_INFO "BIOS-provided physical RAM map:\n");
-                print_memory_map(machine_specific_memory_setup());
+                print_memory_map(memory_setup());
         }
 
         copy_edd();
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 095636620fa2..cd7de9c9654b 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -33,6 +33,11 @@
  *              Dave Jones      :       Report invalid combinations of Athlon CPUs.
 *               Rusty Russell   :       Hacked into shape for new "hotplug" boot process. */
 
+
+/* SMP boot always wants to use real time delay to allow sufficient time for
+ * the APs to come online */
+#define USE_REAL_TIME_DELAY
+
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
index 78af572fd17c..c505b16c0990 100644
--- a/arch/i386/kernel/time.c
+++ b/arch/i386/kernel/time.c
@@ -56,6 +56,7 @@
 #include <asm/uaccess.h>
 #include <asm/processor.h>
 #include <asm/timer.h>
+#include <asm/time.h>
 
 #include "mach_time.h"
 
@@ -116,10 +117,7 @@ static int set_rtc_mmss(unsigned long nowtime)
         /* gets recalled with irq locally disabled */
         /* XXX - does irqsave resolve this? -johnstul */
         spin_lock_irqsave(&rtc_lock, flags);
-        if (efi_enabled)
-                retval = efi_set_rtc_mmss(nowtime);
-        else
-                retval = mach_set_rtc_mmss(nowtime);
+        retval = set_wallclock(nowtime);
         spin_unlock_irqrestore(&rtc_lock, flags);
 
         return retval;
@@ -223,10 +221,7 @@ unsigned long get_cmos_time(void)
 
         spin_lock_irqsave(&rtc_lock, flags);
 
-        if (efi_enabled)
-                retval = efi_get_time();
-        else
-                retval = mach_get_cmos_time();
+        retval = get_wallclock();
 
         spin_unlock_irqrestore(&rtc_lock, flags);
 
@@ -370,7 +365,7 @@ static void __init hpet_time_init(void)
                 printk("Using HPET for base-timer\n");
         }
 
-        time_init_hook();
+        do_time_init();
 }
 #endif
 
@@ -392,5 +387,5 @@ void __init time_init(void)
 
         do_settimeofday(&ts);
 
-        time_init_hook();
+        do_time_init();
 }
diff --git a/arch/i386/power/cpu.c b/arch/i386/power/cpu.c
index 5a1abeff033b..2c15500f8713 100644
--- a/arch/i386/power/cpu.c
+++ b/arch/i386/power/cpu.c
@@ -26,8 +26,8 @@ void __save_processor_state(struct saved_context *ctxt)
         /*
          * descriptor tables
          */
-        store_gdt(&ctxt->gdt_limit);
-        store_idt(&ctxt->idt_limit);
+        store_gdt(&ctxt->gdt);
+        store_idt(&ctxt->idt);
         store_tr(ctxt->tr);
 
         /*
@@ -99,8 +99,8 @@ void __restore_processor_state(struct saved_context *ctxt)
          * now restore the descriptor tables to their proper values
          * ltr is done i fix_processor_context().
          */
-        load_gdt(&ctxt->gdt_limit);
-        load_idt(&ctxt->idt_limit);
+        load_gdt(&ctxt->gdt);
+        load_idt(&ctxt->idt);
 
         /*
          * segment registers
diff --git a/drivers/net/de600.c b/drivers/net/de600.c
index 690bb40b353d..8396e411f1ce 100644
--- a/drivers/net/de600.c
+++ b/drivers/net/de600.c
@@ -43,7 +43,6 @@ static const char version[] = "de600.c: $Revision: 1.41-2.5 $,  Bjorn Ekwall (bj
  * modify the following "#define": (see <asm/io.h> for more info)
 #define REALLY_SLOW_IO
  */
-#define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */
 
 /* use 0 for production, 1 for verification, >2 for debug */
 #ifdef DE600_DEBUG
diff --git a/include/asm-i386/delay.h b/include/asm-i386/delay.h
index 9ae5e3782ed8..32d6678d0bbf 100644
--- a/include/asm-i386/delay.h
+++ b/include/asm-i386/delay.h
@@ -16,6 +16,13 @@ extern void __ndelay(unsigned long nsecs);
 extern void __const_udelay(unsigned long usecs);
 extern void __delay(unsigned long loops);
 
+#if defined(CONFIG_PARAVIRT) && !defined(USE_REAL_TIME_DELAY)
+#define udelay(n) paravirt_ops.const_udelay((n) * 0x10c7ul)
+
+#define ndelay(n) paravirt_ops.const_udelay((n) * 5ul)
+
+#else /* !PARAVIRT || USE_REAL_TIME_DELAY */
+
 /* 0x10c7 is 2**32 / 1000000 (rounded up) */
 #define udelay(n) (__builtin_constant_p(n) ? \
         ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
@@ -25,6 +32,7 @@ extern void __delay(unsigned long loops);
 #define ndelay(n) (__builtin_constant_p(n) ? \
         ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
         __ndelay(n))
+#endif
 
 void use_tsc_delay(void);
 
diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h
index 6cf2ac2bfde7..f19820f0834f 100644
--- a/include/asm-i386/desc.h
+++ b/include/asm-i386/desc.h
@@ -55,6 +55,9 @@ static inline void pack_gate(__u32 *a, __u32 *b,
 #define DESCTYPE_DPL3   0x60    /* DPL-3 */
 #define DESCTYPE_S      0x10    /* !system */
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
 #define load_TR_desc() __asm__ __volatile__("ltr %w0"::"q" (GDT_ENTRY_TSS*8))
 
 #define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr))
@@ -105,7 +108,11 @@ static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, const vo
         write_gdt_entry(get_cpu_gdt_table(cpu), entry, a, b);
 }
 
-static inline void set_ldt(void *addr, unsigned int entries)
+#define set_ldt native_set_ldt
+#endif /* CONFIG_PARAVIRT */
+
+static inline fastcall void native_set_ldt(const void *addr,
+                                           unsigned int entries)
 {
         if (likely(entries == 0))
                 __asm__ __volatile__("lldt %w0"::"q" (0));
diff --git a/include/asm-i386/io.h b/include/asm-i386/io.h
index 68df0dc3ab8f..86ff5e83be2f 100644
--- a/include/asm-i386/io.h
+++ b/include/asm-i386/io.h
@@ -256,11 +256,11 @@ static inline void flush_write_buffers(void)
 
 #endif /* __KERNEL__ */
 
-#ifdef SLOW_IO_BY_JUMPING
-#define __SLOW_DOWN_IO "jmp 1f; 1: jmp 1f; 1:"
+#if defined(CONFIG_PARAVIRT)
+#include <asm/paravirt.h>
 #else
+
 #define __SLOW_DOWN_IO "outb %%al,$0x80;"
-#endif
 
 static inline void slow_down_io(void) {
         __asm__ __volatile__(
@@ -271,6 +271,8 @@ static inline void slow_down_io(void) {
                 : : );
 }
 
+#endif
+
 #ifdef CONFIG_X86_NUMAQ
 extern void *xquad_portio;    /* Where the IO area was mapped */
 #define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
diff --git a/include/asm-i386/irq.h b/include/asm-i386/irq.h
index 331726b41128..9e15ce0006eb 100644
--- a/include/asm-i386/irq.h
+++ b/include/asm-i386/irq.h
@@ -41,4 +41,7 @@ extern int irqbalance_disable(char *str);
 extern void fixup_irqs(cpumask_t map);
 #endif
 
+void init_IRQ(void);
+void __init native_init_IRQ(void);
+
 #endif /* _ASM_IRQ_H */
diff --git a/include/asm-i386/irqflags.h b/include/asm-i386/irqflags.h
index e1bdb97c07fa..9ce01f3fb7bc 100644
--- a/include/asm-i386/irqflags.h
+++ b/include/asm-i386/irqflags.h
@@ -10,6 +10,9 @@
 #ifndef _ASM_IRQFLAGS_H
 #define _ASM_IRQFLAGS_H
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
 #ifndef __ASSEMBLY__
 
 static inline unsigned long __raw_local_save_flags(void)
@@ -25,9 +28,6 @@ static inline unsigned long __raw_local_save_flags(void)
         return flags;
 }
 
-#define raw_local_save_flags(flags) \
-                do { (flags) = __raw_local_save_flags(); } while (0)
-
 static inline void raw_local_irq_restore(unsigned long flags)
 {
         __asm__ __volatile__(
@@ -66,18 +66,6 @@ static inline void halt(void)
         __asm__ __volatile__("hlt": : :"memory");
 }
 
-static inline int raw_irqs_disabled_flags(unsigned long flags)
-{
-        return !(flags & (1 << 9));
-}
-
-static inline int raw_irqs_disabled(void)
-{
-        unsigned long flags = __raw_local_save_flags();
-
-        return raw_irqs_disabled_flags(flags);
-}
-
 /*
  * For spinlocks, etc:
  */
@@ -90,9 +78,33 @@ static inline unsigned long __raw_local_irq_save(void)
         return flags;
 }
 
+#else
+#define DISABLE_INTERRUPTS              cli
+#define ENABLE_INTERRUPTS               sti
+#define ENABLE_INTERRUPTS_SYSEXIT       sti; sysexit
+#define INTERRUPT_RETURN                iret
+#define GET_CR0_INTO_EAX                movl %cr0, %eax
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_PARAVIRT */
+
+#ifndef __ASSEMBLY__
+#define raw_local_save_flags(flags) \
+                do { (flags) = __raw_local_save_flags(); } while (0)
+
 #define raw_local_irq_save(flags) \
                 do { (flags) = __raw_local_irq_save(); } while (0)
 
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+        return !(flags & (1 << 9));
+}
+
+static inline int raw_irqs_disabled(void)
+{
+        unsigned long flags = __raw_local_save_flags();
+
+        return raw_irqs_disabled_flags(flags);
+}
 #endif /* __ASSEMBLY__ */
 
 /*
diff --git a/include/asm-i386/mach-default/setup_arch.h b/include/asm-i386/mach-default/setup_arch.h
index fb42099e7bd4..605e3ccb991b 100644
--- a/include/asm-i386/mach-default/setup_arch.h
+++ b/include/asm-i386/mach-default/setup_arch.h
@@ -2,4 +2,6 @@
 
 /* no action for generic */
 
+#ifndef ARCH_SETUP
 #define ARCH_SETUP
+#endif
diff --git a/include/asm-i386/msr.h b/include/asm-i386/msr.h
index 1820d9d73af3..5679d4993072 100644
--- a/include/asm-i386/msr.h
+++ b/include/asm-i386/msr.h
@@ -1,6 +1,10 @@
 #ifndef __ASM_MSR_H
 #define __ASM_MSR_H
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+
 /*
  * Access to machine-specific registers (available on 586 and better only)
  * Note: the rd* operations modify the parameters directly (without using
@@ -77,6 +81,7 @@ static inline void wrmsrl (unsigned long msr, unsigned long long val)
      __asm__ __volatile__("rdpmc" \
                           : "=a" (low), "=d" (high) \
                           : "c" (counter))
+#endif  /* !CONFIG_PARAVIRT */
 
 /* symbolic names for some interesting MSRs */
 /* Intel defined MSRs. */
diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
new file mode 100644
index 000000000000..a7551a44686f
--- /dev/null
+++ b/include/asm-i386/paravirt.h
@@ -0,0 +1,281 @@
+#ifndef __ASM_PARAVIRT_H
+#define __ASM_PARAVIRT_H
+/* Various instructions on x86 need to be replaced for
+ * para-virtualization: those hooks are defined here. */
+#include <linux/linkage.h>
+
+#ifdef CONFIG_PARAVIRT
+#ifndef __ASSEMBLY__
+struct thread_struct;
+struct Xgt_desc_struct;
+struct tss_struct;
+struct paravirt_ops
+{
+        unsigned int kernel_rpl;
+        int paravirt_enabled;
+        const char *name;
+
+        void (*arch_setup)(void);
+        char *(*memory_setup)(void);
+        void (*init_IRQ)(void);
+
+        void (*banner)(void);
+
+        unsigned long (*get_wallclock)(void);
+        int (*set_wallclock)(unsigned long);
+        void (*time_init)(void);
+
+        /* All the function pointers here are declared as "fastcall"
+           so that we get a specific register-based calling
+           convention.  This makes it easier to implement inline
+           assembler replacements. */
+
+        void (fastcall *cpuid)(unsigned int *eax, unsigned int *ebx,
+                      unsigned int *ecx, unsigned int *edx);
+
+        unsigned long (fastcall *get_debugreg)(int regno);
+        void (fastcall *set_debugreg)(int regno, unsigned long value);
+
+        void (fastcall *clts)(void);
+
+        unsigned long (fastcall *read_cr0)(void);
+        void (fastcall *write_cr0)(unsigned long);
+
+        unsigned long (fastcall *read_cr2)(void);
+        void (fastcall *write_cr2)(unsigned long);
+
+        unsigned long (fastcall *read_cr3)(void);
+        void (fastcall *write_cr3)(unsigned long);
+
+        unsigned long (fastcall *read_cr4_safe)(void);
+        unsigned long (fastcall *read_cr4)(void);
+        void (fastcall *write_cr4)(unsigned long);
+
+        unsigned long (fastcall *save_fl)(void);
+        void (fastcall *restore_fl)(unsigned long);
+        void (fastcall *irq_disable)(void);
+        void (fastcall *irq_enable)(void);
+        void (fastcall *safe_halt)(void);
+        void (fastcall *halt)(void);
+        void (fastcall *wbinvd)(void);
+
+        /* err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
+        u64 (fastcall *read_msr)(unsigned int msr, int *err);
+        int (fastcall *write_msr)(unsigned int msr, u64 val);
+
+        u64 (fastcall *read_tsc)(void);
+        u64 (fastcall *read_pmc)(void);
+
+        void (fastcall *load_tr_desc)(void);
+        void (fastcall *load_gdt)(const struct Xgt_desc_struct *);
+        void (fastcall *load_idt)(const struct Xgt_desc_struct *);
+        void (fastcall *store_gdt)(struct Xgt_desc_struct *);
+        void (fastcall *store_idt)(struct Xgt_desc_struct *);
+        void (fastcall *set_ldt)(const void *desc, unsigned entries);
+        unsigned long (fastcall *store_tr)(void);
+        void (fastcall *load_tls)(struct thread_struct *t, unsigned int cpu);
+        void (fastcall *write_ldt_entry)(void *dt, int entrynum,
+                                         u32 low, u32 high);
+        void (fastcall *write_gdt_entry)(void *dt, int entrynum,
+                                         u32 low, u32 high);
+        void (fastcall *write_idt_entry)(void *dt, int entrynum,
+                                         u32 low, u32 high);
+        void (fastcall *load_esp0)(struct tss_struct *tss,
+                                   struct thread_struct *thread);
+
+        void (fastcall *set_iopl_mask)(unsigned mask);
+
+        void (fastcall *io_delay)(void);
+        void (*const_udelay)(unsigned long loops);
+
+        /* These two are jmp to, not actually called. */
+        void (fastcall *irq_enable_sysexit)(void);
+        void (fastcall *iret)(void);
+};
+
+extern struct paravirt_ops paravirt_ops;
+
+#define paravirt_enabled() (paravirt_ops.paravirt_enabled)
+
+static inline void load_esp0(struct tss_struct *tss,
+                             struct thread_struct *thread)
+{
+        paravirt_ops.load_esp0(tss, thread);
+}
+
+#define ARCH_SETUP                      paravirt_ops.arch_setup();
+static inline unsigned long get_wallclock(void)
+{
+        return paravirt_ops.get_wallclock();
+}
+
+static inline int set_wallclock(unsigned long nowtime)
+{
+        return paravirt_ops.set_wallclock(nowtime);
+}
+
+static inline void do_time_init(void)
+{
+        return paravirt_ops.time_init();
+}
+
+/* The paravirtualized CPUID instruction. */
+static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
+                           unsigned int *ecx, unsigned int *edx)
+{
+        paravirt_ops.cpuid(eax, ebx, ecx, edx);
+}
+
+/*
+ * These special macros can be used to get or set a debugging register
+ */
+#define get_debugreg(var, reg) var = paravirt_ops.get_debugreg(reg)
+#define set_debugreg(val, reg) paravirt_ops.set_debugreg(reg, val)
+
+#define clts() paravirt_ops.clts()
+
+#define read_cr0() paravirt_ops.read_cr0()
+#define write_cr0(x) paravirt_ops.write_cr0(x)
+
+#define read_cr2() paravirt_ops.read_cr2()
+#define write_cr2(x) paravirt_ops.write_cr2(x)
+
+#define read_cr3() paravirt_ops.read_cr3()
+#define write_cr3(x) paravirt_ops.write_cr3(x)
+
+#define read_cr4() paravirt_ops.read_cr4()
+#define read_cr4_safe(x) paravirt_ops.read_cr4_safe()
+#define write_cr4(x) paravirt_ops.write_cr4(x)
+
+static inline unsigned long __raw_local_save_flags(void)
+{
+        return paravirt_ops.save_fl();
+}
+
+static inline void raw_local_irq_restore(unsigned long flags)
+{
+        return paravirt_ops.restore_fl(flags);
+}
+
+static inline void raw_local_irq_disable(void)
+{
+        paravirt_ops.irq_disable();
+}
+
+static inline void raw_local_irq_enable(void)
+{
+        paravirt_ops.irq_enable();
+}
+
+static inline unsigned long __raw_local_irq_save(void)
+{
+        unsigned long flags = paravirt_ops.save_fl();
+
+        paravirt_ops.irq_disable();
+
+        return flags;
+}
+
+static inline void raw_safe_halt(void)
+{
+        paravirt_ops.safe_halt();
+}
+
+static inline void halt(void)
+{
+        paravirt_ops.safe_halt();
+}
+#define wbinvd() paravirt_ops.wbinvd()
+
+#define get_kernel_rpl()  (paravirt_ops.kernel_rpl)
+
+#define rdmsr(msr,val1,val2) do {                               \
+        int _err;                                               \
+        u64 _l = paravirt_ops.read_msr(msr,&_err);              \
+        val1 = (u32)_l;                                         \
+        val2 = _l >> 32;                                        \
+} while(0)
+
+#define wrmsr(msr,val1,val2) do {                               \
+        u64 _l = ((u64)(val2) << 32) | (val1);                  \
+        paravirt_ops.write_msr((msr), _l);                      \
+} while(0)
+
+#define rdmsrl(msr,val) do {                                    \
+        int _err;                                               \
+        val = paravirt_ops.read_msr((msr),&_err);               \
+} while(0)
+
+#define wrmsrl(msr,val) (paravirt_ops.write_msr((msr),(val)))
+#define wrmsr_safe(msr,a,b) ({                                  \
+        u64 _l = ((u64)(b) << 32) | (a);                        \
+        paravirt_ops.write_msr((msr),_l);                       \
+})
+
+/* rdmsr with exception handling */
+#define rdmsr_safe(msr,a,b) ({                                  \
+        int _err;                                               \
+        u64 _l = paravirt_ops.read_msr(msr,&_err);              \
+        (*a) = (u32)_l;                                         \
+        (*b) = _l >> 32;                                        \
+        _err; })
+
+#define rdtsc(low,high) do {                                    \
+        u64 _l = paravirt_ops.read_tsc();                       \
+        low = (u32)_l;                                          \
+        high = _l >> 32;                                        \
+} while(0)
+
+#define rdtscl(low) do {                                        \
+        u64 _l = paravirt_ops.read_tsc();                       \
+        low = (int)_l;                                          \
+} while(0)
+
+#define rdtscll(val) (val = paravirt_ops.read_tsc())
+
+#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
+
+#define rdpmc(counter,low,high) do {                            \
+        u64 _l = paravirt_ops.read_pmc();                       \
+        low = (u32)_l;                                          \
+        high = _l >> 32;                                        \
+} while(0)
+
+#define load_TR_desc() (paravirt_ops.load_tr_desc())
+#define load_gdt(dtr) (paravirt_ops.load_gdt(dtr))
+#define load_idt(dtr) (paravirt_ops.load_idt(dtr))
+#define set_ldt(addr, entries) (paravirt_ops.set_ldt((addr), (entries)))
+#define store_gdt(dtr) (paravirt_ops.store_gdt(dtr))
+#define store_idt(dtr) (paravirt_ops.store_idt(dtr))
+#define store_tr(tr) ((tr) = paravirt_ops.store_tr())
+#define load_TLS(t,cpu) (paravirt_ops.load_tls((t),(cpu)))
+#define write_ldt_entry(dt, entry, low, high)                           \
+        (paravirt_ops.write_ldt_entry((dt), (entry), (low), (high)))
+#define write_gdt_entry(dt, entry, low, high)                           \
+        (paravirt_ops.write_gdt_entry((dt), (entry), (low), (high)))
+#define write_idt_entry(dt, entry, low, high)                           \
+        (paravirt_ops.write_idt_entry((dt), (entry), (low), (high)))
+#define set_iopl_mask(mask) (paravirt_ops.set_iopl_mask(mask))
+
+/* The paravirtualized I/O functions */
+static inline void slow_down_io(void) {
+        paravirt_ops.io_delay();
+#ifdef REALLY_SLOW_IO
+        paravirt_ops.io_delay();
+        paravirt_ops.io_delay();
+        paravirt_ops.io_delay();
+#endif
+}
+
+#define CLI_STRING      "pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax"
+#define STI_STRING      "pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax"
+#else  /* __ASSEMBLY__ */
+
+#define INTERRUPT_RETURN        jmp *%cs:paravirt_ops+PARAVIRT_iret
+#define DISABLE_INTERRUPTS      pushl %eax; pushl %ecx; pushl %edx; call *paravirt_ops+PARAVIRT_irq_disable; popl %edx; popl %ecx; popl %eax
+#define ENABLE_INTERRUPTS       pushl %eax; pushl %ecx; pushl %edx; call *%cs:paravirt_ops+PARAVIRT_irq_enable; popl %edx; popl %ecx; popl %eax
+#define ENABLE_INTERRUPTS_SYSEXIT       jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit
+#define GET_CR0_INTO_EAX        call *paravirt_ops+PARAVIRT_read_cr0
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_PARAVIRT */
+#endif  /* __ASM_PARAVIRT_H */
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index 98fa73b71760..6c2c4457be0a 100644
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -144,8 +144,8 @@ static inline void detect_ht(struct cpuinfo_x86 *c) {}
 #define X86_EFLAGS_VIP  0x00100000 /* Virtual Interrupt Pending */
 #define X86_EFLAGS_ID   0x00200000 /* CPUID detection flag */
 
-static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
-                           unsigned int *ecx, unsigned int *edx)
+static inline fastcall void native_cpuid(unsigned int *eax, unsigned int *ebx,
+                                         unsigned int *ecx, unsigned int *edx)
 {
         /* ecx is often an input as well as an output. */
         __asm__("cpuid"
@@ -491,6 +491,12 @@ struct thread_struct {
         .io_bitmap      = { [ 0 ... IO_BITMAP_LONGS] = ~0 },            \
 }
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define paravirt_enabled() 0
+#define __cpuid native_cpuid
+
 static inline void load_esp0(struct tss_struct *tss, struct thread_struct *thread)
 {
         tss->esp0 = thread->esp0;
@@ -524,10 +530,13 @@ static inline void load_esp0(struct tss_struct *tss, struct thread_struct *threa
                         : /* no output */                       \
                         :"r" (value))
 
+#define set_iopl_mask native_set_iopl_mask
+#endif /* CONFIG_PARAVIRT */
+
 /*
  * Set IOPL bits in EFLAGS from given mask
  */
-static inline void set_iopl_mask(unsigned mask)
+static fastcall inline void native_set_iopl_mask(unsigned mask)
 {
         unsigned int reg;
         __asm__ __volatile__ ("pushfl;"
diff --git a/include/asm-i386/segment.h b/include/asm-i386/segment.h
index 5bdda79b6b53..3c796af33776 100644
--- a/include/asm-i386/segment.h
+++ b/include/asm-i386/segment.h
@@ -131,5 +131,7 @@
 #define SEGMENT_LDT             0x4
 #define SEGMENT_GDT             0x0
 
+#ifndef CONFIG_PARAVIRT
 #define get_kernel_rpl()  0
 #endif
+#endif
diff --git a/include/asm-i386/setup.h b/include/asm-i386/setup.h
index 2734909eff84..9930c5a355fc 100644
--- a/include/asm-i386/setup.h
+++ b/include/asm-i386/setup.h
@@ -70,6 +70,7 @@ extern unsigned char boot_params[PARAM_SIZE];
 struct e820entry;
 
 char * __init machine_specific_memory_setup(void);
+char *memory_setup(void);
 
 int __init copy_e820_map(struct e820entry * biosmap, int nr_map);
 int __init sanitize_e820_map(struct e820entry * biosmap, char * pnr_map);
diff --git a/include/asm-i386/spinlock.h b/include/asm-i386/spinlock.h
index c18b71fae6b3..dea60709db29 100644
--- a/include/asm-i386/spinlock.h
+++ b/include/asm-i386/spinlock.h
@@ -7,8 +7,12 @@
 #include <asm/processor.h>
 #include <linux/compiler.h>
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
 #define CLI_STRING      "cli"
 #define STI_STRING      "sti"
+#endif /* CONFIG_PARAVIRT */
 
 /*
  * Your basic SMP spinlocks, allowing only a single CPU anywhere
diff --git a/include/asm-i386/suspend.h b/include/asm-i386/suspend.h
index 08be1e5009d4..30361526d568 100644
--- a/include/asm-i386/suspend.h
+++ b/include/asm-i386/suspend.h
@@ -23,12 +23,8 @@ arch_prepare_suspend(void)
 struct saved_context {
         u16 es, fs, gs, ss;
         unsigned long cr0, cr2, cr3, cr4;
-        u16 gdt_pad;
-        u16 gdt_limit;
-        unsigned long gdt_base;
-        u16 idt_pad;
-        u16 idt_limit;
-        unsigned long idt_base;
+        struct Xgt_desc_struct gdt;
+        struct Xgt_desc_struct idt;
         u16 ldt;
         u16 tss;
         unsigned long tr;
diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h
index a6dabbcd6e6a..a6d20d9a1a30 100644
--- a/include/asm-i386/system.h
+++ b/include/asm-i386/system.h
@@ -88,6 +88,9 @@ __asm__ __volatile__ ("movw %%dx,%1\n\t" \
 #define savesegment(seg, value) \
         asm volatile("mov %%" #seg ",%0":"=rm" (value))
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
 #define read_cr0() ({ \
         unsigned int __dummy; \
         __asm__ __volatile__( \
@@ -139,17 +142,18 @@ __asm__ __volatile__ ("movw %%dx,%1\n\t" \
 #define write_cr4(x) \
         __asm__ __volatile__("movl %0,%%cr4": :"r" (x))
 
-/*
- * Clear and set 'TS' bit respectively
- */
+#define wbinvd() \
+        __asm__ __volatile__ ("wbinvd": : :"memory")
+
+/* Clear the 'TS' bit */
 #define clts() __asm__ __volatile__ ("clts")
+#endif/* CONFIG_PARAVIRT */
+
+/* Set the 'TS' bit */
 #define stts() write_cr0(8 | read_cr0())
 
 #endif  /* __KERNEL__ */
 
-#define wbinvd() \
-        __asm__ __volatile__ ("wbinvd": : :"memory")
-
 static inline unsigned long get_limit(unsigned long segment)
 {
         unsigned long __limit;
diff --git a/include/asm-i386/time.h b/include/asm-i386/time.h
new file mode 100644
index 000000000000..ea8065af825a
--- /dev/null
+++ b/include/asm-i386/time.h
@@ -0,0 +1,41 @@
+#ifndef _ASMi386_TIME_H
+#define _ASMi386_TIME_H
+
+#include <linux/efi.h>
+#include "mach_time.h"
+
+static inline unsigned long native_get_wallclock(void)
+{
+        unsigned long retval;
+
+        if (efi_enabled)
+                retval = efi_get_time();
+        else
+                retval = mach_get_cmos_time();
+
+        return retval;
+}
+
+static inline int native_set_wallclock(unsigned long nowtime)
+{
+        int retval;
+
+        if (efi_enabled)
+                retval = efi_set_rtc_mmss(nowtime);
+        else
+                retval = mach_set_rtc_mmss(nowtime);
+
+        return retval;
+}
+
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else /* !CONFIG_PARAVIRT */
+
+#define get_wallclock() native_get_wallclock()
+#define set_wallclock(x) native_set_wallclock(x)
+#define do_time_init() time_init_hook()
+
+#endif /* CONFIG_PARAVIRT */
+
+#endif