Changeset 104848 in vbox for trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c

Timestamp:

Jun 5, 2024 9:38:20 AM (8 months ago)

Author:

vboxsync

Message:

VMM/PGM,SUPDrv,IPRT: Added a RTR0MemObjZeroInitialize function to IPRT/SUPDrv for helping zero initializing MMIO2 backing memory. bugref:10687

File:

• trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c (modified) (1 diff)

trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c

@@ -2181 +2181 @@
 }
 
+
+DECLHIDDEN(int) rtR0MemObjNativeZeroInitWithoutMapping(PRTR0MEMOBJINTERNAL pMem)
+{
+    PRTR0MEMOBJLNX const pMemLnx = (PRTR0MEMOBJLNX)pMem;
+    size_t const         cPages  = pMemLnx->Core.cb >> PAGE_SHIFT;
+    size_t               iPage;
+    /** @todo optimize this. */
+    for (iPage = 0; iPage < cPages; iPage++)
+    {
+        void          *pvPage;
+
+        /* Get the physical address of the page. */
+        RTHCPHYS const HCPhys = rtR0MemObjNativeGetPagePhysAddr(&pMemLnx->Core, iPage);
+        AssertReturn(HCPhys != NIL_RTHCPHYS, VERR_INTERNAL_ERROR_3);
+        Assert(!(HCPhys & PAGE_OFFSET_MASK));
+
+        /* Would've like to use valid_phys_addr_range for this test, but it isn't exported. */
+        AssertReturn((HCPhys | PAGE_OFFSET_MASK) < __pa(high_memory), VERR_INTERNAL_ERROR_3);
+
+        /* Map it. */
+        pvPage = phys_to_virt(HCPhys);
+        AssertPtrReturn(pvPage, VERR_INTERNAL_ERROR_3);
+
+        /* Zero it. */
+        RT_BZERO(pvPage, PAGE_SIZE);
+    }
+    return VINF_SUCCESS;
+}
+