[Xen-devel] [PATCH v6 04/14] x86: maintain COS to CBM mapping for each socket

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

For each socket, a COS to CBM mapping structure is maintained for each
COS. The mapping is indexed by COS and the value is the corresponding
CBM. Different VMs may use the same CBM, a reference count is used to
indicate if the CBM is available.

Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
Changes in v5:
* rename cos_cbm_map to cos_to_cbm.
---
 xen/arch/x86/psr.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 768f8cc..1d1c44c 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -21,9 +21,15 @@
 #define PSR_CMT        (1<<0)
 #define PSR_CAT        (1<<1)
 
+struct psr_cat_cbm {
+    uint64_t cbm;
+    unsigned int ref;
+};
+
 struct psr_cat_socket_info {
     unsigned int cbm_len;
     unsigned int cos_max;
+    struct psr_cat_cbm *cos_to_cbm;
 };
 
 struct psr_assoc {
@@ -237,6 +243,14 @@ static void cat_cpu_init(void)
         info->cbm_len = (eax & 0x1f) + 1;
         info->cos_max = min(opt_cos_max, edx & 0xffff);
 
+        info->cos_to_cbm = xzalloc_array(struct psr_cat_cbm,
+                                          info->cos_max + 1UL);
+        if ( !info->cos_to_cbm )
+            return;
+
+        /* cos=0 is reserved as default cbm(all ones). */
+        info->cos_to_cbm[0].cbm = (1ull << info->cbm_len) - 1;
+
         set_bit(socket, cat_socket_enable_bitmap);
         printk(XENLOG_INFO "CAT: enabled on socket %u, cos_max:%u, 
cbm_len:%u\n",
                socket, info->cos_max, info->cbm_len);
-- 
1.9.1


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