[1/6] x86: add a flag to enable Intel processor trace

Commit Message

Luwei Kang Oct. 21, 2017, 8:02 p.m. UTC

This patch add a flag to enable Intel PT (Intel processor trace).
Default value is 1 (enabled).

Signed-off-by: Luwei Kang <[e-mail]>
---
 docs/misc/xen-command-line.markdown |  7 +++++++
 xen/arch/x86/cpu/Makefile           |  1 +
 xen/arch/x86/cpu/intel_pt.c         | 27 +++++++++++++++++++++++++++
 xen/include/asm-x86/intel_pt.h      | 26 ++++++++++++++++++++++++++
 4 files changed, 61 insertions(+)
 create mode 100644 xen/arch/x86/cpu/intel_pt.c
 create mode 100644 xen/include/asm-x86/intel_pt.h

Patch

diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
index eb4995e..a376932 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -1009,6 +1009,13 @@  debug hypervisor only).
 ### idle\_latency\_factor
 > `= <integer>`
 
+### intel\_pt
+> `= <boolean>`
+
+> Default: `true`
+
+Flag to enable Intel Processor Trace.
+
 ### ioapic\_ack
 > `= old | new`
 
diff --git a/xen/arch/x86/cpu/Makefile b/xen/arch/x86/cpu/Makefile
index 74f23ae..33d7a74 100644
--- a/xen/arch/x86/cpu/Makefile
+++ b/xen/arch/x86/cpu/Makefile
@@ -8,3 +8,4 @@  obj-y += intel.o
 obj-y += intel_cacheinfo.o
 obj-y += mwait-idle.o
 obj-y += vpmu.o vpmu_amd.o vpmu_intel.o
+obj-y += intel_pt.o
diff --git a/xen/arch/x86/cpu/intel_pt.c b/xen/arch/x86/cpu/intel_pt.c
new file mode 100644
index 0000000..be06d55
--- /dev/null
+++ b/xen/arch/x86/cpu/intel_pt.c
@@ -0,0 +1,27 @@ 
+/*
+ * intel_pt.c: Support Intel Processor Trace Virtualization.
+ *
+ * Copyright (c) 2017, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Luwei Kang <[e-mail]>
+ */
+
+#include <xen/types.h>
+#include <xen/cache.h>
+#include <xen/init.h>
+
+/* intel_pt: Flag to enable Intel Processor Trace (default on). */
+bool_t __read_mostly opt_intel_pt = 1;
+boolean_param("intel_pt", opt_intel_pt);
diff --git a/xen/include/asm-x86/intel_pt.h b/xen/include/asm-x86/intel_pt.h
new file mode 100644
index 0000000..3b3a047
--- /dev/null
+++ b/xen/include/asm-x86/intel_pt.h
@@ -0,0 +1,26 @@ 
+/*
+ * intel_pt.h: Intel Processor Trace virtualization for HVM domain.
+ *
+ * Copyright (c) 2017, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Luwei Kang <[e-mail]>
+ */
+
+#ifndef __ASM_X86_HVM_INTEL_PT_H_
+#define __ASM_X86_HVM_INTEL_PT_H_
+
+extern bool_t opt_intel_pt;
+
+#endif /* __ASM_X86_HVM_INTEL_PT_H_ */