[Xen-devel] [PATCH 4/8] x86: dynamically attach/detach CQM service for a guest

[dongxiao.xu@xxxxxxxxx]

From: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>

Add hypervisor side support for dynamically attach and detach CQM
services for a certain guest.

Signed-off-by: Jiongxi Li <jiongxi.li@xxxxxxxxx>
Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
 xen/arch/x86/domctl.c       |   66 +++++++++++++++++++++++++++++++++++++++++++
 xen/include/public/domctl.h |   15 ++++++++++
 2 files changed, 81 insertions(+)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index f7e4586..df6a373 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -35,6 +35,7 @@
 #include <asm/mem_sharing.h>
 #include <asm/xstate.h>
 #include <asm/debugger.h>
+#include <asm/pqos.h>
 
 static int gdbsx_guest_mem_io(
     domid_t domid, struct xen_domctl_gdbsx_memio *iop)
@@ -1223,6 +1224,71 @@ long arch_do_domctl(
     }
     break;
 
+    case XEN_DOMCTL_attach_pqos:
+    {
+        struct domain *d;
+
+        if ( (d = rcu_lock_domain_by_id(domctl->domain)) == NULL )
+        {
+            ret = -EBUSY;
+            break;
+        }
+
+        if ( domctl->u.qos_res.flags & XEN_DOMCTL_ADF_pqos_cqm )
+        {
+            if ( !system_support_cqm() )
+                ret = -ENODEV;
+            else if ( d->arch.pqos_cqm_rmid > 0 )
+                ret = -EINVAL;
+            else
+            {
+                ret = 0;
+                d->arch.pqos_cqm_rmid = alloc_cqm_resource(d->domain_id);
+                if ( d->arch.pqos_cqm_rmid <= 0 )
+                {
+                    /* set to default value */
+                    d->arch.pqos_cqm_rmid = 0;
+                    ret = -ENODEV;
+                }
+            }
+        }
+        else
+            ret = -EINVAL;
+
+        rcu_unlock_domain(d);
+    }
+    break;
+
+    case XEN_DOMCTL_detach_pqos:
+    {
+        struct domain *d;
+
+        if ( (d = rcu_lock_domain_by_id(domctl->domain)) == NULL )
+        {
+            ret = -EBUSY;
+            break;
+        }
+
+        if ( domctl->u.qos_res.flags & XEN_DOMCTL_ADF_pqos_cqm )
+        {
+            if ( !system_support_cqm() )
+                ret = -ENODEV;
+            else if ( d->arch.pqos_cqm_rmid > 0 )
+            {
+                free_cqm_resource(d->domain_id);
+                d->arch.pqos_cqm_rmid = 0;
+                ret = 0;
+            }
+            else
+                ret = -EINVAL;
+        }
+        else
+            ret = -EINVAL;
+
+        rcu_unlock_domain(d);
+    }
+    break;
+
     default:
         ret = iommu_do_domctl(domctl, d, u_domctl);
         break;
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 47a850a..4fe21db 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -872,6 +872,17 @@ struct xen_domctl_set_max_evtchn {
 typedef struct xen_domctl_set_max_evtchn xen_domctl_set_max_evtchn_t;
 DEFINE_XEN_GUEST_HANDLE(xen_domctl_set_max_evtchn_t);
 
+/* XEN_DOMCTL_attach_pqos */
+/* XEN_DOMCTL_detach_pqos */
+struct xen_domctl_qos_resource {
+ /* Attach or detach flag for cqm */
+#define _XEN_DOMCTL_ADF_pqos_cqm      0
+#define XEN_DOMCTL_ADF_pqos_cqm       (1U<<_XEN_DOMCTL_ADF_pqos_cqm)
+    uint32_t flags;
+};
+typedef struct xen_domctl_qos_resource xen_domctl_qos_resource_t;
+DEFINE_XEN_GUEST_HANDLE(xen_domctl_qos_resource_t);
+
 struct xen_domctl {
     uint32_t cmd;
 #define XEN_DOMCTL_createdomain                   1
@@ -941,6 +952,9 @@ struct xen_domctl {
 #define XEN_DOMCTL_setnodeaffinity               68
 #define XEN_DOMCTL_getnodeaffinity               69
 #define XEN_DOMCTL_set_max_evtchn                70
+#define XEN_DOMCTL_attach_pqos                   71
+#define XEN_DOMCTL_detach_pqos                   72
+#define XEN_DOMCTL_list_pqos                     73
 #define XEN_DOMCTL_gdbsx_guestmemio            1000
 #define XEN_DOMCTL_gdbsx_pausevcpu             1001
 #define XEN_DOMCTL_gdbsx_unpausevcpu           1002
@@ -1001,6 +1015,7 @@ struct xen_domctl {
         struct xen_domctl_set_broken_page_p2m set_broken_page_p2m;
         struct xen_domctl_gdbsx_pauseunp_vcpu gdbsx_pauseunp_vcpu;
         struct xen_domctl_gdbsx_domstatus   gdbsx_domstatus;
+        struct xen_domctl_qos_resource      qos_res;
         uint8_t                             pad[128];
     } u;
 };
-- 
1.7.9.5


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