[Qemu-devel] [PATCH 2/3] qxl: store memory region and offset instead of pointer for guest slots

[Gerd Hoffmann <kraxel@redhat.com>]

Store MemoryRegion and offset instead of a pointer for each qxl memory
slot, so we can easily figure in which memory region an qxl object
stored.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/qxl.c | 15 +++++++++++----
 hw/display/qxl.h |  3 ++-
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index 409c236..4909a7e 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -1243,6 +1243,7 @@ static int qxl_add_memslot(PCIQXLDevice *d, uint32_t slot_id, uint64_t delta,
     int pci_region;
     pcibus_t pci_start;
     pcibus_t pci_end;
+    MemoryRegion *mr;
     intptr_t virt_start;
     QXLDevMemSlot memslot;
     int i;
@@ -1289,11 +1290,11 @@ static int qxl_add_memslot(PCIQXLDevice *d, uint32_t slot_id, uint64_t delta,
 
     switch (pci_region) {
     case QXL_RAM_RANGE_INDEX:
-        virt_start = (intptr_t)memory_region_get_ram_ptr(&d->vga.vram);
+        mr = &d->vga.vram;
         break;
     case QXL_VRAM_RANGE_INDEX:
     case 4 /* vram 64bit */:
-        virt_start = (intptr_t)memory_region_get_ram_ptr(&d->vram_bar);
+        mr = &d->vram_bar;
         break;
     default:
         /* should not happen */
@@ -1301,6 +1302,7 @@ static int qxl_add_memslot(PCIQXLDevice *d, uint32_t slot_id, uint64_t delta,
         return 1;
     }
 
+    virt_start = (intptr_t)memory_region_get_ram_ptr(mr);
     memslot.slot_id = slot_id;
     memslot.slot_group_id = MEMSLOT_GROUP_GUEST; /* guest group */
     memslot.virt_start = virt_start + (guest_start - pci_start);
@@ -1310,7 +1312,8 @@ static int qxl_add_memslot(PCIQXLDevice *d, uint32_t slot_id, uint64_t delta,
     qxl_rom_set_dirty(d);
 
     qemu_spice_add_memslot(&d->ssd, &memslot, async);
-    d->guest_slots[slot_id].ptr = (void*)memslot.virt_start;
+    d->guest_slots[slot_id].mr = mr;
+    d->guest_slots[slot_id].offset = memslot.virt_start - virt_start;
     d->guest_slots[slot_id].size = memslot.virt_end - memslot.virt_start;
     d->guest_slots[slot_id].delta = delta;
     d->guest_slots[slot_id].active = 1;
@@ -1377,6 +1380,7 @@ void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL pqxl, int group_id)
 {
     uint64_t offset;
     uint32_t slot;
+    void *ptr;
 
     switch (group_id) {
     case MEMSLOT_GROUP_HOST:
@@ -1386,7 +1390,10 @@ void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL pqxl, int group_id)
         if (!qxl_get_check_slot_offset(qxl, pqxl, &slot, &offset)) {
             return NULL;
         }
-        return qxl->guest_slots[slot].ptr + offset;
+        ptr = memory_region_get_ram_ptr(qxl->guest_slots[slot].mr);
+        ptr += qxl->guest_slots[slot].offset;
+        ptr += offset;
+        return ptr;
     }
     return NULL;
 }
diff --git a/hw/display/qxl.h b/hw/display/qxl.h
index 2ddf065..0147bcc 100644
--- a/hw/display/qxl.h
+++ b/hw/display/qxl.h
@@ -53,7 +53,8 @@ typedef struct PCIQXLDevice {
 
     struct guest_slots {
         QXLMemSlot     slot;
-        void           *ptr;
+        MemoryRegion   *mr;
+        uint64_t       offset;
         uint64_t       size;
         uint64_t       delta;
         uint32_t       active;
-- 
1.8.3.1