linux-kernel - [PATCH v2 03/21] x86/xen: add CONFIG_XEN

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Date:   Thu,  2 Mar 2017 18:53:39 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     xen-devel@...ts.xenproject.org
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Andrew Jones <drjones@...hat.com>
Subject: [PATCH v2 03/21] x86/xen: add CONFIG_XEN_PV to Kconfig

All code to supprot Xen PV will get under this new option. For the
beginning, check for it in the common code.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/kernel/cpu/hypervisor.c |  4 +++-
 arch/x86/kernel/process_64.c     |  2 +-
 arch/x86/xen/Kconfig             | 23 ++++++++++++++++++-----
 3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index a77f18d..ce6fcc3 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -28,8 +28,10 @@
 
 static const __initconst struct hypervisor_x86 * const hypervisors[] =
 {
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_PV
 	&x86_hyper_xen_pv,
+#endif
+#ifdef CONFIG_XEN_PVHVM
 	&x86_hyper_xen_hvm,
 #endif
 	&x86_hyper_vmware,
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index a61e141..5e8d129 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -438,7 +438,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 		     task_thread_info(prev_p)->flags & _TIF_WORK_CTXSW_PREV))
 		__switch_to_xtra(prev_p, next_p, tss);
 
-#ifdef CONFIG_XEN
+#ifdef CONFIG_XEN_PV
 	/*
 	 * On Xen PV, IOPL bits in pt_regs->flags have no effect, and
 	 * current_pt_regs()->flags may not match the current task's
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 76b6dbd..c387560 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -6,7 +6,6 @@ config XEN
 	bool "Xen guest support"
 	depends on PARAVIRT
 	select PARAVIRT_CLOCK
-	select XEN_HAVE_PVMMU
 	select XEN_HAVE_VPMU
 	depends on X86_64 || (X86_32 && X86_PAE)
 	depends on X86_LOCAL_APIC && X86_TSC
@@ -15,18 +14,32 @@ config XEN
 	  kernel to boot in a paravirtualized environment under the
 	  Xen hypervisor.
 
+config XEN_PV
+	bool "Xen PV guest support"
+	default y
+	depends on XEN
+	help
+	  Support running as a Xen PV guest.
+
 config XEN_DOM0
-	def_bool y
-	depends on XEN && PCI_XEN && SWIOTLB_XEN
+	bool "Xen PV Dom0 support"
+	default y
+	depends on XEN_PV && PCI_XEN && SWIOTLB_XEN
 	depends on X86_IO_APIC && ACPI && PCI
+	select XEN_HAVE_PVMMU
+	help
+	  Support running as a Xen PV Dom0 guest.
 
 config XEN_PVHVM
-	def_bool y
+	bool "Xen PVHVM guest support"
+	default y
 	depends on XEN && PCI && X86_LOCAL_APIC
+	help
+	  Support running as a Xen PVHVM guest.
 
 config XEN_512GB
 	bool "Limit Xen pv-domain memory to 512GB"
-	depends on XEN && X86_64
+	depends on XEN_PV && X86_64
 	default y
 	help
 	  Limit paravirtualized user domains to 512GB of RAM.
-- 
2.9.3