linux-kernel - [tip:x86/paravirt] x86/paravirt: Introduce new config option PARAVIRT

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Date:   Mon, 3 Sep 2018 07:59:56 -0700
From:   tip-bot for Juergen Gross <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jgross@...e.com, mingo@...nel.org,
        hpa@...or.com, tglx@...utronix.de
Subject: [tip:x86/paravirt] x86/paravirt: Introduce new config option
 PARAVIRT_XXL

Commit-ID:  c00a280a8efa4dc077596cf646bd50cbd13db3c8
Gitweb:     https://git.kernel.org/tip/c00a280a8efa4dc077596cf646bd50cbd13db3c8
Author:     Juergen Gross <jgross@...e.com>
AuthorDate: Tue, 28 Aug 2018 09:40:21 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 3 Sep 2018 16:50:35 +0200

x86/paravirt: Introduce new config option PARAVIRT_XXL

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@...e.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: xen-devel@...ts.xenproject.org
Cc: virtualization@...ts.linux-foundation.org
Cc: akataria@...are.com
Cc: rusty@...tcorp.com.au
Cc: boris.ostrovsky@...cle.com
Cc: hpa@...or.com
Link: https://lkml.kernel.org/r/20180828074026.820-11-jgross@suse.com

---
 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 1a0be022f91d..6265b84f6386 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