Passthrough the register 0xa0 on the host bridge.

It looks like the intel graphic driver for windows XP
except this value to be set.
It should be harmless for vista.

This patch makes winxp run as a PVM.

diff --git a/master/vga-passthrough b/master/vga-passthrough
index d2adba9f84a17df59b1bedc843d29433b4f1eff0..91fe35716558b9e98d44666afe739cb2a03925f7 100644 (file)
--- a/master/vga-passthrough
+++ b/master/vga-passthrough
@@ -1,5 +1,5 @@
 diff --git a/hw/pass-through.c b/hw/pass-through.c
-index 6a53137..3420e95 100644
+index 51a39db..10904c9 100644
 --- a/hw/pass-through.c
 +++ b/hw/pass-through.c
 @@ -90,6 +90,8 @@
@@ -88,7 +88,7 @@ index 6a53137..3420e95 100644
  }
  
  static uint8_t find_cap_offset(struct pci_dev *pci_dev, uint8_t cap)
-@@ -4084,3 +4130,41 @@ err:
+@@ -4113,3 +4159,41 @@ err:
      return status;
  }
  
@@ -145,7 +145,7 @@ index a503e80..1752e8d 100644
  #endif /* __PASSTHROUGH_H__ */
  
 diff --git a/hw/pci.c b/hw/pci.c
-index d7c516e..b2f4d43 100644
+index d7c516e..ec8b0c4 100644
 --- a/hw/pci.c
 +++ b/hw/pci.c
 @@ -28,11 +28,14 @@
@@ -163,7 +163,7 @@ index d7c516e..b2f4d43 100644
  struct PCIBus {
      int bus_num;
      int devfn_min;
-@@ -611,7 +614,30 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int len)
+@@ -611,7 +614,32 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int len)
          goto the_end;
      }
      config_addr = addr & 0xff;
@@ -186,6 +186,8 @@ index d7c516e..b2f4d43 100644
 +          else if (len == 4)
 +              val = pt_pci_host_read_long(0, 0, 0, 0x00);
 +      }
++        if (config_addr == 0xa0 && len == 2)
++              val = pt_pci_host_read_word(0, 0, 0, 0xa0);
 +    }
 +    else if (vga_passthrough && pci_dev->devfn == 0x10 && // intel graphic card
 +          config_addr == 0xfc) // OpRegion address
@@ -196,7 +198,7 @@ index d7c516e..b2f4d43 100644
      printf("pci_config_read: %s: addr=%02x val=%08x len=%d\n",
             pci_dev->name, config_addr, val, len);
 diff --git a/vl.c b/vl.c
-index b273c75..e519705 100644
+index cdbe2a3..6d79072 100644
 --- a/vl.c
 +++ b/vl.c
 @@ -233,6 +233,7 @@ CharDriverState *virtcon_hds[MAX_VIRTIO_CONSOLES];
@@ -207,7 +209,7 @@ index b273c75..e519705 100644
  #endif
  int usb_enabled = 0;
  int smp_cpus = 1;
-@@ -4275,6 +4276,7 @@ enum {
+@@ -4287,6 +4288,7 @@ enum {
      QEMU_OPTION_domainname,
      QEMU_OPTION_acpi,
      QEMU_OPTION_vcpus,
@@ -215,7 +217,7 @@ index b273c75..e519705 100644
  
      /* Debug/Expert options: */
      QEMU_OPTION_serial,
-@@ -4448,6 +4450,7 @@ static const QEMUOption qemu_options[] = {
+@@ -4460,6 +4462,7 @@ static const QEMUOption qemu_options[] = {
      { "pciemulation", HAS_ARG, QEMU_OPTION_pci_emulation },
      { "vncunused", 0, QEMU_OPTION_vncunused },
      { "vcpus", HAS_ARG, QEMU_OPTION_vcpus },
@@ -223,7 +225,7 @@ index b273c75..e519705 100644
  #if defined(CONFIG_XEN) && !defined(CONFIG_DM)
      { "xen-domid", HAS_ARG, QEMU_OPTION_xen_domid },
      { "xen-create", 0, QEMU_OPTION_xen_create },
-@@ -5281,6 +5284,9 @@ int main(int argc, char **argv, char **envp)
+@@ -5293,6 +5296,9 @@ int main(int argc, char **argv, char **envp)
              case QEMU_OPTION_disable_opengl:
                  opengl_enabled = 0;
                  break;