Merge branches 'x86/paravirt', 'x86/pat', 'x86/setup-v2', 'x86/subarch', 'x86/uaccess...
[linux-2.6.git] / arch / x86 / kernel / paravirt.c
index e4c8fb6..6dc4dca 100644 (file)
@@ -44,6 +44,17 @@ void _paravirt_nop(void)
 {
 }
 
+/* identity function, which can be inlined */
+u32 _paravirt_ident_32(u32 x)
+{
+       return x;
+}
+
+u64 _paravirt_ident_64(u64 x)
+{
+       return x;
+}
+
 static void __init default_banner(void)
 {
        printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
@@ -138,9 +149,16 @@ unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
        if (opfunc == NULL)
                /* If there's no function, patch it with a ud2a (BUG) */
                ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a));
-       else if (opfunc == paravirt_nop)
+       else if (opfunc == _paravirt_nop)
                /* If the operation is a nop, then nop the callsite */
                ret = paravirt_patch_nop();
+
+       /* identity functions just return their single argument */
+       else if (opfunc == _paravirt_ident_32)
+               ret = paravirt_patch_ident_32(insnbuf, len);
+       else if (opfunc == _paravirt_ident_64)
+               ret = paravirt_patch_ident_64(insnbuf, len);
+
        else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
                 type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) ||
                 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret32) ||
@@ -268,6 +286,32 @@ enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
        return __get_cpu_var(paravirt_lazy_mode);
 }
 
+void arch_flush_lazy_mmu_mode(void)
+{
+       preempt_disable();
+
+       if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
+               WARN_ON(preempt_count() == 1);
+               arch_leave_lazy_mmu_mode();
+               arch_enter_lazy_mmu_mode();
+       }
+
+       preempt_enable();
+}
+
+void arch_flush_lazy_cpu_mode(void)
+{
+       preempt_disable();
+
+       if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
+               WARN_ON(preempt_count() == 1);
+               arch_leave_lazy_cpu_mode();
+               arch_enter_lazy_cpu_mode();
+       }
+
+       preempt_enable();
+}
+
 struct pv_info pv_info = {
        .name = "bare hardware",
        .paravirt_enabled = 0,
@@ -292,10 +336,10 @@ struct pv_time_ops pv_time_ops = {
 
 struct pv_irq_ops pv_irq_ops = {
        .init_IRQ = native_init_IRQ,
-       .save_fl = native_save_fl,
-       .restore_fl = native_restore_fl,
-       .irq_disable = native_irq_disable,
-       .irq_enable = native_irq_enable,
+       .save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
+       .restore_fl = __PV_IS_CALLEE_SAVE(native_restore_fl),
+       .irq_disable = __PV_IS_CALLEE_SAVE(native_irq_disable),
+       .irq_enable = __PV_IS_CALLEE_SAVE(native_irq_enable),
        .safe_halt = native_safe_halt,
        .halt = native_halt,
 #ifdef CONFIG_X86_64
@@ -373,6 +417,14 @@ struct pv_apic_ops pv_apic_ops = {
 #endif
 };
 
+#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
+/* 32-bit pagetable entries */
+#define PTE_IDENT      __PV_IS_CALLEE_SAVE(_paravirt_ident_32)
+#else
+/* 64-bit pagetable entries */
+#define PTE_IDENT      __PV_IS_CALLEE_SAVE(_paravirt_ident_64)
+#endif
+
 struct pv_mmu_ops pv_mmu_ops = {
 #ifndef CONFIG_X86_64
        .pagetable_setup_start = native_pagetable_setup_start,
@@ -424,22 +476,23 @@ struct pv_mmu_ops pv_mmu_ops = {
        .pmd_clear = native_pmd_clear,
 #endif
        .set_pud = native_set_pud,
-       .pmd_val = native_pmd_val,
-       .make_pmd = native_make_pmd,
+
+       .pmd_val = PTE_IDENT,
+       .make_pmd = PTE_IDENT,
 
 #if PAGETABLE_LEVELS == 4
-       .pud_val = native_pud_val,
-       .make_pud = native_make_pud,
+       .pud_val = PTE_IDENT,
+       .make_pud = PTE_IDENT,
+
        .set_pgd = native_set_pgd,
 #endif
 #endif /* PAGETABLE_LEVELS >= 3 */
 
-       .pte_val = native_pte_val,
-       .pte_flags = native_pte_flags,
-       .pgd_val = native_pgd_val,
+       .pte_val = PTE_IDENT,
+       .pgd_val = PTE_IDENT,
 
-       .make_pte = native_make_pte,
-       .make_pgd = native_make_pgd,
+       .make_pte = PTE_IDENT,
+       .make_pgd = PTE_IDENT,
 
        .dup_mmap = paravirt_nop,
        .exit_mmap = paravirt_nop,