From: Alexander Graf <agraf@suse.de>
Date: Wed, 18 Nov 2009 00:39:12 +0100
Subject: Only export selected pv-ops feature structs
References: bnc#556135, FATE#306453
Patch-Mainline: Submitted to virtualization list
To really check for sure that we're not using any pv-ops code by accident,
we should make sure that we don't even export the structures used to access
pv-ops exported functions.
So let's surround the pv-ops structs by #ifdefs.
Signed-off-by: Alexander Graf <agraf@suse.de>
---
arch/x86/kernel/paravirt.c | 35 +++++++++++++++++++++++++++++------
1 file changed, 29 insertions(+), 6 deletions(-)
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -124,11 +124,21 @@ static void *get_call_destination(u8 typ
{
struct paravirt_patch_template tmpl = {
.pv_init_ops = pv_init_ops,
+#ifdef CONFIG_PARAVIRT_TIME
.pv_time_ops = pv_time_ops,
+#endif
+#ifdef CONFIG_PARAVIRT_CPU
.pv_cpu_ops = pv_cpu_ops,
+#endif
+#ifdef CONFIG_PARAVIRT_IRQ
.pv_irq_ops = pv_irq_ops,
+#endif
+#ifdef CONFIG_PARAVIRT_APIC
.pv_apic_ops = pv_apic_ops,
+#endif
+#ifdef CONFIG_PARAVIRT_MMU
.pv_mmu_ops = pv_mmu_ops,
+#endif
#ifdef CONFIG_PARAVIRT_SPINLOCKS
.pv_lock_ops = pv_lock_ops,
#endif
@@ -185,6 +195,7 @@ unsigned paravirt_patch_insns(void *insn
return insn_len;
}
+#ifdef CONFIG_PARAVIRT_MMU
static void native_flush_tlb(void)
{
__native_flush_tlb();
@@ -203,6 +214,7 @@ static void native_flush_tlb_single(unsi
{
__native_flush_tlb_single(addr);
}
+#endif /* CONFIG_PARAVIRT_MMU */
/* These are in entry.S */
extern void native_iret(void);
@@ -284,6 +296,7 @@ enum paravirt_lazy_mode paravirt_get_laz
return percpu_read(paravirt_lazy_mode);
}
+#ifdef CONFIG_PARAVIRT_MMU
void arch_flush_lazy_mmu_mode(void)
{
preempt_disable();
@@ -295,6 +308,7 @@ void arch_flush_lazy_mmu_mode(void)
preempt_enable();
}
+#endif /* CONFIG_PARAVIRT_MMU */
struct pv_info pv_info = {
.name = "bare hardware",
@@ -306,11 +320,16 @@ struct pv_info pv_info = {
struct pv_init_ops pv_init_ops = {
.patch = native_patch,
};
+EXPORT_SYMBOL_GPL(pv_info);
+#ifdef CONFIG_PARAVIRT_TIME
struct pv_time_ops pv_time_ops = {
.sched_clock = native_sched_clock,
};
+EXPORT_SYMBOL_GPL(pv_time_ops);
+#endif
+#ifdef CONFIG_PARAVIRT_IRQ
struct pv_irq_ops pv_irq_ops = {
.save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
.restore_fl = __PV_IS_CALLEE_SAVE(native_restore_fl),
@@ -322,7 +341,10 @@ struct pv_irq_ops pv_irq_ops = {
.adjust_exception_frame = paravirt_nop,
#endif
};
+EXPORT_SYMBOL (pv_irq_ops);
+#endif
+#ifdef CONFIG_PARAVIRT_CPU
struct pv_cpu_ops pv_cpu_ops = {
.cpuid = native_cpuid,
.get_debugreg = native_get_debugreg,
@@ -383,12 +405,17 @@ struct pv_cpu_ops pv_cpu_ops = {
.start_context_switch = paravirt_nop,
.end_context_switch = paravirt_nop,
};
+EXPORT_SYMBOL (pv_cpu_ops);
+#endif
+#ifdef CONFIG_PARAVIRT_APIC
struct pv_apic_ops pv_apic_ops = {
#ifdef CONFIG_X86_LOCAL_APIC
.startup_ipi_hook = paravirt_nop,
#endif
};
+EXPORT_SYMBOL_GPL(pv_apic_ops);
+#endif
#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
/* 32-bit pagetable entries */
@@ -398,6 +425,7 @@ struct pv_apic_ops pv_apic_ops = {
#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64)
#endif
+#ifdef CONFIG_PARAVIRT_MMU
struct pv_mmu_ops pv_mmu_ops = {
.read_cr2 = native_read_cr2,
@@ -466,10 +494,5 @@ struct pv_mmu_ops pv_mmu_ops = {
.set_fixmap = native_set_fixmap,
};
-
-EXPORT_SYMBOL_GPL(pv_time_ops);
-EXPORT_SYMBOL (pv_cpu_ops);
EXPORT_SYMBOL (pv_mmu_ops);
-EXPORT_SYMBOL_GPL(pv_apic_ops);
-EXPORT_SYMBOL_GPL(pv_info);
-EXPORT_SYMBOL (pv_irq_ops);
+#endif