[v3,3/7] vfio/igd: use new BDSM register location and size for gen 11 and later

Commit Message

Corvin Köhne Aug. 28, 2024, 1:43 p.m. UTC

Intel changed the location and size of the BDSM register for gen 11
devices and later. We have to adjust our emulation for these devices to
properly support them.

Signed-off-by: Corvin Köhne <[e-mail]>
---
 hw/vfio/igd.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

Patch

diff --git a/hw/vfio/igd.c b/hw/vfio/igd.c
index d5e57656a8..0b6533bbf7 100644
--- a/hw/vfio/igd.c
+++ b/hw/vfio/igd.c
@@ -100,11 +100,12 @@  static int igd_gen(VFIOPCIDevice *vdev)
 typedef struct VFIOIGDQuirk {
     struct VFIOPCIDevice *vdev;
     uint32_t index;
-    uint32_t bdsm;
+    uint64_t bdsm;
 } VFIOIGDQuirk;
 
 #define IGD_GMCH 0x50 /* Graphics Control Register */
 #define IGD_BDSM 0x5c /* Base Data of Stolen Memory */
+#define IGD_BDSM_GEN11 0xc0 /* Base Data of Stolen Memory of gen 11 and later */
 
 
 /*
@@ -313,9 +314,13 @@  static void vfio_igd_quirk_data_write(void *opaque, hwaddr addr,
      */
     if ((igd->index % 4 == 1) && igd->index < vfio_igd_gtt_max(vdev)) {
         if (gen < 8 || (igd->index % 8 == 1)) {
-            uint32_t base;
+            uint64_t base;
 
-            base = pci_get_long(vdev->pdev.config + IGD_BDSM);
+            if (gen < 11) {
+                base = pci_get_long(vdev->pdev.config + IGD_BDSM);
+            } else {
+                base = pci_get_quad(vdev->pdev.config + IGD_BDSM_GEN11);
+            }
             if (!base) {
                 hw_error("vfio-igd: Guest attempted to program IGD GTT before "
                          "BIOS reserved stolen memory.  Unsupported BIOS?");
@@ -519,7 +524,13 @@  void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr)
     igd = quirk->data = g_malloc0(sizeof(*igd));
     igd->vdev = vdev;
     igd->index = ~0;
-    igd->bdsm = vfio_pci_read_config(&vdev->pdev, IGD_BDSM, 4);
+    if (gen < 11) {
+        igd->bdsm = vfio_pci_read_config(&vdev->pdev, IGD_BDSM, 4);
+    } else {
+        igd->bdsm = vfio_pci_read_config(&vdev->pdev, IGD_BDSM_GEN11, 4);
+        igd->bdsm |=
+            (uint64_t)vfio_pci_read_config(&vdev->pdev, IGD_BDSM_GEN11 + 4, 4) << 32;
+    }
     igd->bdsm &= ~((1 * MiB) - 1); /* 1MB aligned */
 
     memory_region_init_io(&quirk->mem[0], OBJECT(vdev), &vfio_igd_index_quirk,
@@ -577,9 +588,15 @@  void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr)
     pci_set_long(vdev->emulated_config_bits + IGD_GMCH, ~0);
 
     /* BDSM is read-write, emulated.  The BIOS needs to be able to write it */
-    pci_set_long(vdev->pdev.config + IGD_BDSM, 0);
-    pci_set_long(vdev->pdev.wmask + IGD_BDSM, ~0);
-    pci_set_long(vdev->emulated_config_bits + IGD_BDSM, ~0);
+    if (gen < 11) {
+        pci_set_long(vdev->pdev.config + IGD_BDSM, 0);
+        pci_set_long(vdev->pdev.wmask + IGD_BDSM, ~0);
+        pci_set_long(vdev->emulated_config_bits + IGD_BDSM, ~0);
+    } else {
+        pci_set_quad(vdev->pdev.config + IGD_BDSM_GEN11, 0);
+        pci_set_quad(vdev->pdev.wmask + IGD_BDSM_GEN11, ~0);
+        pci_set_quad(vdev->emulated_config_bits + IGD_BDSM_GEN11, ~0);
+    }
 
     /*
      * This IOBAR gives us access to GTTADR, which allows us to write to