[Xen-devel] [PATCH v3 10/15] x86/paravirt: introduce new config option PARAVIRT_XXL

[Juergen Gross <jgross@xxxxxxxx>]

A large amount of paravirt ops is used by Xen PV guests only. Add a new
config option PARAVIRT_XXL which is selected by XEN_PV. Later we can
put the Xen PV only paravirt ops under the PARAVIRT_XXL umbrella.

Since irq related paravirt ops are used only by VSMP and Xen PV, let
VSMP select PARAVIRT_XXL, too, in order to enable moving the irq ops
under PARAVIRT_XXL.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V3:
- let VSMP select PARAVIRT_XXL (Peter Zijlstra)
---
 arch/x86/Kconfig                   | 4 ++++
 arch/x86/boot/compressed/misc.h    | 1 +
 arch/x86/mm/mem_encrypt_identity.c | 1 +
 arch/x86/xen/Kconfig               | 1 +
 4 files changed, 7 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c5ff296bc5d1..61dfdb694483 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -523,6 +523,7 @@ config X86_VSMP
        bool "ScaleMP vSMP"
        select HYPERVISOR_GUEST
        select PARAVIRT
+       select PARAVIRT_XXL
        depends on X86_64 && PCI
        depends on X86_EXTENDED_PLATFORM
        depends on SMP
@@ -754,6 +755,9 @@ config PARAVIRT
          over full virtualization.  However, when run without a hypervisor
          the kernel is theoretically slower and slightly larger.
 
+config PARAVIRT_XXL
+       bool
+
 config PARAVIRT_DEBUG
        bool "paravirt-ops debugging"
        depends on PARAVIRT && DEBUG_KERNEL
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index a423bdb42686..a1d5918765f3 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -9,6 +9,7 @@
  * paravirt and debugging variants are added.)
  */
 #undef CONFIG_PARAVIRT
+#undef CONFIG_PARAVIRT_XXL
 #undef CONFIG_PARAVIRT_SPINLOCKS
 #undef CONFIG_KASAN
 
diff --git a/arch/x86/mm/mem_encrypt_identity.c 
b/arch/x86/mm/mem_encrypt_identity.c
index 7ae36868aed2..a19ef1a416ff 100644
--- a/arch/x86/mm/mem_encrypt_identity.c
+++ b/arch/x86/mm/mem_encrypt_identity.c
@@ -27,6 +27,7 @@
  * be extended when new paravirt and debugging variants are added.)
  */
 #undef CONFIG_PARAVIRT
+#undef CONFIG_PARAVIRT_XXL
 #undef CONFIG_PARAVIRT_SPINLOCKS
 
 #include <linux/kernel.h>
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index c1f98f32c45f..dd92d7bd3613 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -18,6 +18,7 @@ config XEN_PV
        bool "Xen PV guest support"
        default y
        depends on XEN
+       select PARAVIRT_XXL
        select XEN_HAVE_PVMMU
        select XEN_HAVE_VPMU
        help
-- 
2.16.4


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