linux-kernel - [tip:x86/platform] jailhouse: Provide detection for non-x86 systems

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Date:   Thu, 8 Mar 2018 03:33:54 -0800
From:   tip-bot for Jan Kiszka <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, andy.shevchenko@...il.com,
        bhelgaas@...gle.com, mark.rutland@....com, jan.kiszka@...mens.com,
        hpa@...or.com, robh+dt@...nel.org, tglx@...utronix.de,
        mingo@...nel.org, jgross@...e.com
Subject: [tip:x86/platform] jailhouse: Provide detection for non-x86 systems

Commit-ID:  63338a38db955cb4e0352c11b78732157c78d30b
Gitweb:     https://git.kernel.org/tip/63338a38db955cb4e0352c11b78732157c78d30b
Author:     Jan Kiszka <jan.kiszka@...mens.com>
AuthorDate: Wed, 7 Mar 2018 08:39:12 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 8 Mar 2018 12:30:37 +0100

jailhouse: Provide detection for non-x86 systems

Implement jailhouse_paravirt() via device tree probing on architectures
!= x86. Will be used by the PCI core.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Juergen Gross <jgross@...e.com>
Cc: jailhouse-dev@...glegroups.com
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-pci@...r.kernel.org
Cc: virtualization@...ts.linux-foundation.org
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Link: https://lkml.kernel.org/r/dae9fe0c6e63141c28ca90492fa5712b4c33ffb5.1520408357.git.jan.kiszka@siemens.com

---
 Documentation/devicetree/bindings/jailhouse.txt |  8 ++++++++
 arch/x86/include/asm/jailhouse_para.h           |  2 +-
 include/linux/hypervisor.h                      | 17 +++++++++++++++--
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/jailhouse.txt b/Documentation/devicetree/bindings/jailhouse.txt
new file mode 100644
index 000000000000..2901c25ff340
--- /dev/null
+++ b/Documentation/devicetree/bindings/jailhouse.txt
@@ -0,0 +1,8 @@
+Jailhouse non-root cell device tree bindings
+--------------------------------------------
+
+When running in a non-root Jailhouse cell (partition), the device tree of this
+platform shall have a top-level "hypervisor" node with the following
+properties:
+
+- compatible = "jailhouse,cell"
diff --git a/arch/x86/include/asm/jailhouse_para.h b/arch/x86/include/asm/jailhouse_para.h
index 875b54376689..b885a961a150 100644
--- a/arch/x86/include/asm/jailhouse_para.h
+++ b/arch/x86/include/asm/jailhouse_para.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL2.0 */
 
 /*
- * Jailhouse paravirt_ops implementation
+ * Jailhouse paravirt detection
  *
  * Copyright (c) Siemens AG, 2015-2017
  *
diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h
index b19563f9a8eb..fc08b433c856 100644
--- a/include/linux/hypervisor.h
+++ b/include/linux/hypervisor.h
@@ -8,15 +8,28 @@
  */
 
 #ifdef CONFIG_X86
+
+#include <asm/jailhouse_para.h>
 #include <asm/x86_init.h>
+
 static inline void hypervisor_pin_vcpu(int cpu)
 {
 	x86_platform.hyper.pin_vcpu(cpu);
 }
-#else
+
+#else /* !CONFIG_X86 */
+
+#include <linux/of.h>
+
 static inline void hypervisor_pin_vcpu(int cpu)
 {
 }
-#endif
+
+static inline bool jailhouse_paravirt(void)
+{
+	return of_find_compatible_node(NULL, NULL, "jailhouse,cell");
+}
+
+#endif /* !CONFIG_X86 */
 
 #endif /* __LINUX_HYPEVISOR_H */