[Xen-devel] [PATCH v19 08/10] x86: add CMT related MSRs in allowed list

[Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>]

Tool stack will try to access the two MSRs to perform CMT
related operations, thus added them in the allowed list.

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/platform_hypercall.c |    8 ++++++++
 xen/include/asm-x86/msr-index.h   |    2 ++
 2 files changed, 10 insertions(+)

diff --git a/xen/arch/x86/platform_hypercall.c 
b/xen/arch/x86/platform_hypercall.c
index 35d9cbe..cf4b9b6 100644
--- a/xen/arch/x86/platform_hypercall.c
+++ b/xen/arch/x86/platform_hypercall.c
@@ -70,6 +70,14 @@ struct xen_resource_access {
 
 static bool_t allow_access_msr(unsigned int msr)
 {
+    switch ( msr )
+    {
+    /* MSR for CMT, refer to chapter 17.14 of Intel SDM. */
+    case MSR_IA32_CMT_EVTSEL:
+    case MSR_IA32_CMT_CTR:
+        return 1;
+    }
+
     return 0;
 }
 
diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index 7214b40..83f2f70 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -324,6 +324,8 @@
 #define MSR_IA32_ENERGY_PERF_BIAS      0x000001b0
 
 /* Platform Shared Resource MSRs */
+#define MSR_IA32_CMT_EVTSEL            0x00000c8d
+#define MSR_IA32_CMT_CTR               0x00000c8e
 #define MSR_IA32_PSR_ASSOC             0x00000c8f
 
 /* Intel Model 6 */
-- 
1.7.9.5


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