[Xen-devel] [PATCH v11 3/9] tools: provide interface for generic MSR access

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

Xen added a new sysctl hypercall for generic MSR access, and this is the
tool side change to wrapper the hypercall into xc APIs.

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
 tools/libxc/Makefile     |  1 +
 tools/libxc/xc_msr_x86.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++
 tools/libxc/xenctrl.h    |  6 ++++++
 3 files changed, 60 insertions(+)
 create mode 100644 tools/libxc/xc_msr_x86.c

diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index a74b19e..fec4aca 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -35,6 +35,7 @@ CTRL_SRCS-y       += xc_kexec.c
 CTRL_SRCS-y       += xtl_core.c
 CTRL_SRCS-y       += xtl_logger_stdio.c
 CTRL_SRCS-$(CONFIG_X86) += xc_pagetab.c
+CTRL_SRCS-$(CONFIG_X86) += xc_msr_x86.c
 CTRL_SRCS-$(CONFIG_Linux) += xc_linux.c xc_linux_osdep.c
 CTRL_SRCS-$(CONFIG_SunOS) += xc_solaris.c
 CTRL_SRCS-$(CONFIG_NetBSD) += xc_netbsd.c
diff --git a/tools/libxc/xc_msr_x86.c b/tools/libxc/xc_msr_x86.c
new file mode 100644
index 0000000..46e77dd
--- /dev/null
+++ b/tools/libxc/xc_msr_x86.c
@@ -0,0 +1,53 @@
+/*
+ * xc_msr_x86.c
+ *
+ * Generic MSR access API
+ *
+ * Copyright (C) 2014      Intel Corporation
+ * Author Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#include "xc_private.h"
+
+int xc_msr_op(xc_interface *xch, uint32_t cpu,
+              uint32_t nr_ops, xc_msr_data_t *msr_data)
+{
+    int rc;
+    DECLARE_SYSCTL;
+    DECLARE_HYPERCALL_BOUNCE(msr_data, nr_ops * sizeof(*msr_data),
+                             XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+
+    if ( xc_hypercall_bounce_pre(xch, msr_data) )
+        return -1;
+
+    sysctl.cmd = XEN_SYSCTL_msr_op;
+    sysctl.u.msr_op.nr_ops = nr_ops;
+    sysctl.u.msr_op.cpu = cpu;
+    set_xen_guest_handle(sysctl.u.msr_op.msr_data, msr_data);
+
+    rc = do_sysctl(xch, &sysctl);
+
+    xc_hypercall_bounce_post(xch, msr_data);
+
+    return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 02129f7..50625ca 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -2424,4 +2424,10 @@ int xc_kexec_load(xc_interface *xch, uint8_t type, 
uint16_t arch,
  */
 int xc_kexec_unload(xc_interface *xch, int type);
 
+#if defined(__i386__) || defined(__x86_64__)
+typedef xen_sysctl_msr_data_t xc_msr_data_t;
+int xc_msr_op(xc_interface *xch, uint32_t cpu,
+    uint32_t nr_ops, xc_msr_data_t *msr_data);
+#endif
+
 #endif /* XENCTRL_H */
-- 
1.8.1.5


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