Changeset 87700 in vbox for trunk/src/VBox/HostDrivers/Support/linux

Timestamp:

Feb 10, 2021 8:21:04 PM (4 years ago)

Author:

vboxsync

Message:

SUPDrv,++: Experimental support for wrapping .r0 modules in native kernel modules on linux, so that perf and similar tools work better. Minor IOC version increase as SUP_IOCTL_LDR_OPEN now support just opening a module w/o preparing the loading. SUPDrv must export all the symbols in g_aFunctions the linux way now, or linux won't see them, so introduced a SUPR0_EXPORT_SYMBOL macro similar to RT_EXPORT_SYMBOL. bugref:9937

Location:

trunk/src/VBox/HostDrivers/Support/linux

Files:

• Makefile-vbox_vboxddr0.gmk (added)
• Makefile-vbox_vmmr0.gmk (added)
• Makefile-wrapper.gmk (added)
• SUPDrv-linux.c (modified) (5 diffs)
• SUPWrapperMod-linux.c (added)
• VBoxR0-wrapped.lds (added)

trunk/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c

@@ -751 +751 @@
     return supdrvIDC(uReq, &g_DevExt, pSession, pReq);
 }
-
 EXPORT_SYMBOL(SUPDrvLinuxIDC);
+
+
+/**
+ * Used by native wrapper modules, forwarding to supdrvLdrRegisterWrappedModule
+ * with device extension prepended to the argument list.
+ */
+SUPR0DECL(int)  SUPDrvLinuxLdrRegisterWrappedModule(PCSUPLDRWRAPPEDMODULE pWrappedModInfo, void *pvLnxModule, void **phMod)
+{
+    AssertPtrReturn(pvLnxModule, VERR_INVALID_POINTER);
+    return supdrvLdrRegisterWrappedModule(&g_DevExt, pWrappedModInfo, pvLnxModule, phMod);
+}
+EXPORT_SYMBOL(SUPDrvLinuxLdrRegisterWrappedModule);
+
+
+/**
+ * Used by native wrapper modules, forwarding to supdrvLdrDeregisterWrappedModule
+ * with device extension prepended to the argument list.
+ */
+SUPR0DECL(int) SUPDrvLinuxLdrDeregisterWrappedModule(PCSUPLDRWRAPPEDMODULE pWrappedModInfo, void **phMod)
+{
+    return supdrvLdrDeregisterWrappedModule(&g_DevExt, pWrappedModInfo, phMod);
+}
+EXPORT_SYMBOL(SUPDrvLinuxLdrDeregisterWrappedModule);
 
 
@@ -1244 +1266 @@
 
 
+void VBOXCALL   supdrvOSLdrRetainWrapperModule(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage)
+{
+    struct module *pLnxMod = (struct module *)pImage->pvWrappedNative;
+    Assert(!pImage->fLnxWrapperRef);
+    AssertReturnVoid(pLnxMod);
+    pImage->fLnxWrapperRef = try_module_get(pLnxMod);
+    RT_NOREF(pDevExt);
+}
+
+
+void VBOXCALL   supdrvOSLdrReleaseWrapperModule(PSUPDRVDEVEXT pDevExt, PSUPDRVLDRIMAGE pImage)
+{
+    if (pImage->fLnxWrapperRef)
+    {
+        struct module *pLnxMod = (struct module *)pImage->pvWrappedNative;
+        pImage->fLnxWrapperRef = false;
+        module_put(pLnxMod);
+    }
+    RT_NOREF(pDevExt);
+}
+
+
 #ifdef SUPDRV_WITH_MSR_PROBER
 
@@ -1412 +1456 @@
     return VINF_SUCCESS;
 }
+SUPR0_EXPORT_SYMBOL(SUPR0HCPhysToVirt);
 
 
@@ -1430 +1475 @@
     return 0;
 }
+SUPR0_EXPORT_SYMBOL(SUPR0Printf);
 
 
@@ -1449 +1495 @@
     return fFlags;
 }
+SUPR0_EXPORT_SYMBOL(SUPR0GetKernelFeatures);