[Xen-devel] [PATCH 1/4] x86: expose CMT L3 event mask to user space

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

L3 event mask indicates the event types supported in host, including
cache occupancy event as well as local/total memory bandwidth events
for Memory Bandwidth Monitoring(MBM). Expose it so all these events
can be monitored in user space.

Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/sysctl.c       |    5 +++++
 xen/include/public/sysctl.h |    1 +
 2 files changed, 6 insertions(+)

diff --git a/xen/arch/x86/sysctl.c b/xen/arch/x86/sysctl.c
index 57ad992..0f08038 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -157,6 +157,11 @@ long arch_do_sysctl(
             sysctl->u.psr_cmt_op.u.data = (ret ? 0 : info.size);
             break;
         }
+        case XEN_SYSCTL_PSR_CMT_get_l3_event_mask:
+        {
+            sysctl->u.psr_cmt_op.u.data = psr_cmt->l3.features;
+            break;
+        }
         default:
             sysctl->u.psr_cmt_op.u.data = 0;
             ret = -ENOSYS;
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index b3713b3..8552dc6 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -641,6 +641,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_sysctl_coverage_op_t);
 /* The L3 cache size is returned in KB unit */
 #define XEN_SYSCTL_PSR_CMT_get_l3_cache_size         2
 #define XEN_SYSCTL_PSR_CMT_enabled                   3
+#define XEN_SYSCTL_PSR_CMT_get_l3_event_mask         4
 struct xen_sysctl_psr_cmt_op {
     uint32_t cmd;       /* IN: XEN_SYSCTL_PSR_CMT_* */
     uint32_t flags;     /* padding variable, may be extended for future use */
-- 
1.7.9.5


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