[PATCH v2 06/13] libx86: Introduce libx86/msr.h and share msr_policy with userspace

[Andrew Cooper <andrew.cooper3@citrix.com>]

To facilitate the shared Xen and toolstack code in libx86, struct msr_policy
needs to be available in the same way as struct cpuid_policy.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Sergey Dyasli <sergey.dyasli@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>

v2:
 * Rebase over the msr_{domain,vcpu}_policy rename
 * Don't move vcpu_msrs into libx86
---
 tools/libxc/xc_cpuid_x86.c   |  1 +
 xen/include/asm-x86/msr.h    | 23 +++--------------------
 xen/include/xen/libx86/msr.h | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 20 deletions(-)
 create mode 100644 xen/include/xen/libx86/msr.h

diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index 3c214c8..cc7300c 100644
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -33,6 +33,7 @@ enum {
 };
 
 #include <xen/libx86/cpuid.h>
+#include <xen/libx86/msr.h>
 
 #define bitmaskof(idx)      (1u << ((idx) & 31))
 #define featureword_of(idx) ((idx) >> 5)
diff --git a/xen/include/asm-x86/msr.h b/xen/include/asm-x86/msr.h
index 9b4e4e0..e6f6f11 100644
--- a/xen/include/asm-x86/msr.h
+++ b/xen/include/asm-x86/msr.h
@@ -8,6 +8,9 @@
 #include <xen/types.h>
 #include <xen/percpu.h>
 #include <xen/errno.h>
+
+#include <xen/libx86/msr.h>
+
 #include <asm/asm_defns.h>
 #include <asm/cpufeature.h>
 
@@ -257,26 +260,6 @@ static inline void wrmsr_tsc_aux(uint32_t val)
     }
 }
 
-/* MSR policy object for shared per-domain MSRs */
-struct msr_policy
-{
-    /*
-     * 0x000000ce - MSR_INTEL_PLATFORM_INFO
-     *
-     * This MSR is non-architectural, but for simplicy we allow it to be read
-     * unconditionally.  CPUID Faulting support can be fully emulated for HVM
-     * guests so can be offered unconditionally, while support for PV guests
-     * is dependent on real hardware support.
-     */
-    union {
-        uint32_t raw;
-        struct {
-            uint32_t :31;
-            bool cpuid_faulting:1;
-        };
-    } plaform_info;
-};
-
 extern struct msr_policy     raw_msr_policy,
                             host_msr_policy,
                          hvm_max_msr_policy,
diff --git a/xen/include/xen/libx86/msr.h b/xen/include/xen/libx86/msr.h
new file mode 100644
index 0000000..b8b1751
--- /dev/null
+++ b/xen/include/xen/libx86/msr.h
@@ -0,0 +1,35 @@
+/* Common data structures and functions consumed by hypervisor and toolstack */
+#ifndef XEN_LIBX86_MSR_H
+#define XEN_LIBX86_MSR_H
+
+/* MSR policy object for shared per-domain MSRs */
+struct msr_policy
+{
+    /*
+     * 0x000000ce - MSR_INTEL_PLATFORM_INFO
+     *
+     * This MSR is non-architectural, but for simplicy we allow it to be read
+     * unconditionally.  CPUID Faulting support can be fully emulated for HVM
+     * guests so can be offered unconditionally, while support for PV guests
+     * is dependent on real hardware support.
+     */
+    union {
+        uint32_t raw;
+        struct {
+            uint32_t :31;
+            bool cpuid_faulting:1;
+        };
+    } plaform_info;
+};
+
+#endif /* !XEN_LIBX86_MSR_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.1.4


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