linux-kernel - [PATCH v8 3/7] xen/pvh: Create a new file for Xen specific PVH code

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Message-Id: <1544076330-21992-1-git-send-email-maran.wilson@oracle.com>
Date:   Wed,  5 Dec 2018 22:05:28 -0800
From:   Maran Wilson <maran.wilson@...cle.com>
To:     x86@...nel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com, jgross@...e.com
Cc:     boris.ostrovsky@...cle.com, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, roger.pau@...rix.com, rkrcmar@...hat.com,
        maran.wilson@...cle.com
Subject: [PATCH v8 3/7] xen/pvh: Create a new file for Xen specific PVH code

We need to refactor PVH entry code so that support for other hypervisors
like Qemu/KVM can be added more easily.

The first step in that direction is to create a new file that will
eventually hold the Xen specific routines.

Signed-off-by: Maran Wilson <maran.wilson@...cle.com>
Reviewed-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/platform/pvh/enlighten.c |  5 ++---
 arch/x86/xen/Makefile             |  2 ++
 arch/x86/xen/enlighten_pvh.c      | 10 ++++++++++
 3 files changed, 14 insertions(+), 3 deletions(-)
 create mode 100644 arch/x86/xen/enlighten_pvh.c

diff --git a/arch/x86/platform/pvh/enlighten.c b/arch/x86/platform/pvh/enlighten.c
index 02e3ab7ff242..491932991202 100644
--- a/arch/x86/platform/pvh/enlighten.c
+++ b/arch/x86/platform/pvh/enlighten.c
@@ -18,10 +18,9 @@
 /*
  * PVH variables.
  *
- * xen_pvh pvh_bootparams and pvh_start_info need to live in data segment
- * since they are used after startup_{32|64}, which clear .bss, are invoked.
+ * pvh_bootparams and pvh_start_info need to live in the data segment since
+ * they are used after startup_{32|64}, which clear .bss, are invoked.
  */
-bool xen_pvh __attribute__((section(".data"))) = 0;
 struct boot_params pvh_bootparams __attribute__((section(".data")));
 struct hvm_start_info pvh_start_info __attribute__((section(".data")));
 
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index b239922f6c6c..084de77a109e 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -36,6 +36,8 @@ obj-$(CONFIG_XEN_PV)		+= multicalls.o
 obj-$(CONFIG_XEN_PV)		+= xen-asm.o
 obj-$(CONFIG_XEN_PV)		+= xen-asm_$(BITS).o
 
+obj-$(CONFIG_XEN_PVH)		+= enlighten_pvh.o
+
 obj-$(CONFIG_EVENT_TRACING)	+= trace.o
 
 obj-$(CONFIG_SMP)		+= smp.o
diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c
new file mode 100644
index 000000000000..6be7bc719b38
--- /dev/null
+++ b/arch/x86/xen/enlighten_pvh.c
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+
+/*
+ * PVH variables.
+ *
+ * The variable xen_pvh needs to live in the data segment since it is used
+ * after startup_{32|64} is invoked, which will clear the .bss segment.
+ */
+bool xen_pvh __attribute__((section(".data"))) = 0;
-- 
2.16.1