Introduce CONFIG_XEN_PVHVM compile option

This patch introduce a CONFIG_XEN_PVHVM compile time option to
enable/disable Xen PV on HVM support.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

6 files changed, 14 insertions, 2 deletions

diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index 5bccedcb912..8095f8611f8 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -34,7 +34,7 @@ static const __initconst struct hypervisor_x86 * const hypervisors[] =
 {
 	&x86_hyper_vmware,
 	&x86_hyper_ms_hyperv,
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_PVHVM
 	&x86_hyper_xen_hvm,
 #endif
 };
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index b83e119fbeb..68128a1b401 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -13,6 +13,11 @@ config XEN
 	  kernel to boot in a paravirtualized environment under the
 	  Xen hypervisor.
 
+config XEN_PVHVM
+	def_bool y
+	depends on XEN
+	depends on X86_LOCAL_APIC
+
 config XEN_MAX_DOMAIN_MEMORY
        int "Maximum allowed size of a domain in gigabytes"
        default 8 if X86_32
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 75b479a684f..6f5345378ab 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1282,6 +1282,7 @@ void xen_hvm_init_shared_info(void)
 	}
 }
 
+#ifdef CONFIG_XEN_PVHVM
 static int __cpuinit xen_hvm_cpu_notify(struct notifier_block *self,
 				    unsigned long action, void *hcpu)
 {
@@ -1338,3 +1339,4 @@ const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = {
 	.init_platform		= xen_hvm_guest_init,
 };
 EXPORT_SYMBOL(x86_hyper_xen_hvm);
+#endif
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 84648c1bf13..413b19b3d0f 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1942,6 +1942,7 @@ void __init xen_init_mmu_ops(void)
 	pv_mmu_ops = xen_mmu_ops;
 }
 
+#ifdef CONFIG_XEN_PVHVM
 static void xen_hvm_exit_mmap(struct mm_struct *mm)
 {
 	struct xen_hvm_pagetable_dying a;
@@ -1973,6 +1974,7 @@ void __init xen_hvm_init_mmu_ops(void)
 	if (is_pagetable_dying_supported())
 		pv_mmu_ops.exit_mmap = xen_hvm_exit_mmap;
 }
+#endif
 
 #ifdef CONFIG_XEN_DEBUG_FS
 
diff --git a/arch/x86/xen/platform-pci-unplug.c b/arch/x86/xen/platform-pci-unplug.c
index 2f7f3fb3477..554c002a1e1 100644
--- a/arch/x86/xen/platform-pci-unplug.c
+++ b/arch/x86/xen/platform-pci-unplug.c
@@ -32,6 +32,7 @@
 /* store the value of xen_emul_unplug after the unplug is done */
 int xen_platform_pci_unplug;
 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
+#ifdef CONFIG_XEN_PVHVM
 static int xen_emul_unplug;
 
 static int __init check_platform_magic(void)
@@ -133,3 +134,4 @@ static int __init parse_xen_emul_unplug(char *arg)
 	return 0;
 }
 early_param("xen_emul_unplug", parse_xen_emul_unplug);
+#endif
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 4780e55886a..2aab4a2b910 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -516,6 +516,7 @@ __init void xen_init_time_ops(void)
 	x86_platform.set_wallclock = xen_set_wallclock;
 }
 
+#ifdef CONFIG_XEN_PVHVM
 static void xen_hvm_setup_cpu_clockevents(void)
 {
 	int cpu = smp_processor_id();
@@ -544,4 +545,4 @@ __init void xen_hvm_init_time_ops(void)
 	x86_platform.get_wallclock = xen_get_wallclock;
 	x86_platform.set_wallclock = xen_set_wallclock;
 }
-
+#endif