Changeset 19992 in vbox for trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp

Timestamp:

May 25, 2009 11:31:23 AM (16 years ago)

Author:

vboxsync

Message:

Started with TPR caching for 32 bits guest (VT-x only).

File:

• trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp

@@ -1884 +1884 @@
 }
 
+/**
+ * Mapping a HC page in place of an MMIO page for direct access.
+ *
+ * (This is a special optimization used by the APIC in the VT-x case.)
+ *
+ * @returns VBox status code.
+ *
+ * @param   pVM             The virtual machine.
+ * @param   GCPhys          The address of the MMIO page to be changed.
+ * @param   HCPhys          The address of the host physical page.
+ * @param   fPageFlags      Page flags to set. Must be (X86_PTE_RW | X86_PTE_P)
+ *                          for the time being.
+ */
+VMMDECL(int) IOMMMIOMapMMIOHCPage(PVM pVM, RTGCPHYS GCPhys, RTHCPHYS HCPhys, uint64_t fPageFlags)
+{
+    Log(("IOMMMIOMapMMIOHCPage %RGp -> %RGp flags=%RX64\n", GCPhys, HCPhys, fPageFlags));
+
+    AssertReturn(fPageFlags == (X86_PTE_RW | X86_PTE_P), VERR_INVALID_PARAMETER);
+    Assert(HWACCMIsEnabled(pVM));
+
+    PVMCPU pVCpu = VMMGetCpu(pVM);
+
+    /*
+     * Lookup the context range node the page belongs to.
+     */
+    PIOMMMIORANGE pRange = iomMMIOGetRange(&pVM->iom.s, GCPhys);
+    AssertMsgReturn(pRange,
+                    ("Handlers and page tables are out of sync or something! GCPhys=%RGp\n", GCPhys),
+                    VERR_IOM_MMIO_RANGE_NOT_FOUND);
+    Assert((pRange->GCPhys       & PAGE_OFFSET_MASK) == 0);
+    Assert((pRange->Core.KeyLast & PAGE_OFFSET_MASK) == PAGE_OFFSET_MASK);
+
+    /*
+     * Do the aliasing; page align the addresses since PGM is picky.
+     */
+    GCPhys &= ~(RTGCPHYS)PAGE_OFFSET_MASK;
+    HCPhys &= ~(RTHCPHYS)PAGE_OFFSET_MASK;
+
+    int rc = PGMHandlerPhysicalPageAliasHC(pVM, pRange->GCPhys, GCPhys, HCPhys);
+    AssertRCReturn(rc, rc);
+
+    /*
+     * Modify the shadow page table. Since it's an MMIO page it won't be present and we
+     * can simply prefetch it.
+     *
+     * Note: This is a NOP in the EPT case; we'll just let it fault again to resync the page.
+     */
+    rc = PGMPrefetchPage(pVCpu, (RTGCPTR)GCPhys);
+    Assert(rc == VINF_SUCCESS || rc == VERR_PAGE_NOT_PRESENT || rc == VERR_PAGE_TABLE_NOT_PRESENT);
+    return VINF_SUCCESS;
+}
 
 /**