Changeset 19529 in vbox for trunk/src/VBox

Timestamp:

May 8, 2009 2:37:30 PM (16 years ago)

Author:

vboxsync

Message:

Introduced VMMR3AtomicExecuteHandler

Location:

trunk/src/VBox/VMM

Files:

• VMM.cpp (modified) (4 diffs)
• VMMInternal.h (modified) (1 diff)

trunk/src/VBox/VMM/VMM.cpp

@@ -138 +138 @@
     else
         AssertMsgRCReturn(rc, ("Configuration error. Failed to query \"YieldEMTInterval\", rc=%Rrc\n", rc), rc);
+
+    /*
+     * Initialize the VMM sync critical section.
+     */
+    rc = RTCritSectInit(&pVM->vmm.s.CritSectSync);
+    AssertRCReturn(rc, rc);
 
     /* GC switchers are enabled by default. Turned off by HWACCM. */
@@ -612 +618 @@
     }
 
+    RTCritSectDelete(&pVM->vmm.s.CritSectSync);
+
 #ifdef VBOX_STRICT_VMM_STACK
     /*
@@ -1148 +1156 @@
 
 /**
- * On VCPU worker for VMMSendSipi.
+ * VCPU worker for VMMSendSipi.
  *
  * @param   pVM         The VM to operate on.
@@ -1215 +1223 @@
     AssertRC(rc);
     VMR3ReqFree(pReq);
+}
+
+
+/**
+ * VCPU worker for VMMR3SynchronizeAllVCpus.
+ *
+ * @param   pVM         The VM to operate on.
+ * @param   idCpu       Virtual CPU to perform SIPI on
+ * @param   uVector     SIPI vector
+ */
+DECLCALLBACK(int) vmmR3SyncVCpu(PVM pVM)
+{
+    /* Block until the job in the caller has finished. */
+    RTCritSectEnter(&pVM->vmm.s.CritSectSync);
+    RTCritSectLeave(&pVM->vmm.s.CritSectSync);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Atomically execute a callback handler
+ * Note: This is very expensive; avoid using it frequently!
+ *
+ * @param   pVM         The VM to operate on.
+ * @param   pfnHandler  Callback handler
+ * @param   pvUser      User specified parameter
+ */
+VMMR3DECL(int) VMMR3AtomicExecuteHandler(PVM pVM, PFNATOMICHANDLER pfnHandler, void *pvUser)
+{
+    int    rc;
+    PVMCPU pVCpu = VMMGetCpu(pVM);
+    AssertReturn(pVCpu, VERR_VM_THREAD_NOT_EMT);
+
+    /* Shortcut for the uniprocessor case. */
+    if (pVM->cCPUs == 1)
+        return pfnHandler(pVM, pvUser);
+
+    RTCritSectEnter(&pVM->vmm.s.CritSectSync);
+    for (VMCPUID idCpu = 0; idCpu < pVM->cCPUs; idCpu++)
+    {
+        if (idCpu != pVCpu->idCpu)
+        {
+            rc = VMR3ReqCallU(pVM->pUVM, idCpu, NULL, 0, VMREQFLAGS_NO_WAIT,
+                              (PFNRT)vmmR3SyncVCpu, 1, pVM);
+            AssertRC(rc);
+        }
+    }
+    /* Wait until all other VCPUs are waiting for us. */
+    while (RTCritSectGetWaiters(&pVM->vmm.s.CritSectSync) != (pVM->cCPUs - 1))
+        RTThreadSleep(1);
+
+    rc = pfnHandler(pVM, pvUser);
+    RTCritSectLeave(&pVM->vmm.s.CritSectSync);
+    return rc;
 }
 

trunk/src/VBox/VMM/VMMInternal.h

@@ -247 +247 @@
     /** The timestamp of the previous yield. (nano) */
     uint64_t                    u64LastYield;
+
+    /** Critical section.
+     * Use for synchronizing all VCPUs
+     */
+    RTCRITSECT                 CritSectSync;
 
     /** Buffer for storing the standard assertion message for a ring-0 assertion.