Support PCI based option rom loading

Currently, we preload option roms into the option rom space in memory.  This
prevents DDIM from functioning correctly which severely limits the number
of roms we can support.

This patch introduces a pci_add_option_rom() which registers the
PCI_ROM_ADDRESS bar which points to our option rom.  It also converts over
the cirrus vga adapter, the rtl8139, virtio, and the e1000 to use this
new mechanism.

The result is that PXE boot functions even with three unique types of cards.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

6 files changed, 44 insertions, 4 deletions

diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 24af81c..b08d2ae 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -3211,7 +3211,7 @@ static int pci_cirrus_vga_initfn(PCIDevice *dev)
      }
 
      /* ROM BIOS */
-     rom_add_vga(VGABIOS_CIRRUS_FILENAME);
+     pci_add_option_rom((PCIDevice *)d, VGABIOS_CIRRUS_FILENAME);
      return 0;
 }
 
diff --git a/hw/e1000.c b/hw/e1000.c
index 8566fe3..f795601 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -1125,7 +1125,7 @@ static int pci_e1000_init(PCIDevice *pci_dev)
     if (!pci_dev->qdev.hotplugged) {
         static int loaded = 0;
         if (!loaded) {
-            rom_add_option("pxe-e1000.bin");
+            pci_add_option_rom(&d->dev, "pxe-e1000.bin");
             loaded = 1;
         }
     }
diff --git a/hw/pci.c b/hw/pci.c
index 086da4f..b037fd8 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -26,6 +26,7 @@
 #include "monitor.h"
 #include "net.h"
 #include "sysemu.h"
+#include "loader.h"
 
 //#define DEBUG_PCI
 #ifdef DEBUG_PCI
@@ -1438,6 +1439,40 @@ static uint8_t pci_find_capability_list(PCIDevice *pdev, uint8_t cap_id,
     return next;
 }
 
+static void pci_map_option_rom(PCIDevice *pdev, int region_num, pcibus_t addr, pcibus_t size, int type)
+{
+    cpu_register_physical_memory(addr, size, pdev->rom_offset);
+}
+
+/* Add an option rom for the device */
+int pci_add_option_rom(PCIDevice *pdev, const char *name)
+{
+    int size;
+    char *path;
+    void *ptr;
+
+    path = qemu_find_file(QEMU_FILE_TYPE_BIOS, name);
+    if (path == NULL) {
+        path = qemu_strdup(name);
+    }
+
+    size = get_image_size(path);
+    if (size & (size - 1)) {
+        size = 1 << qemu_fls(size);
+    }
+
+    pdev->rom_offset = qemu_ram_alloc(size);
+
+    ptr = qemu_get_ram_ptr(pdev->rom_offset);
+    load_image(path, ptr);
+    qemu_free(path);
+
+    pci_register_bar(pdev, PCI_ROM_SLOT, size,
+                     0, pci_map_option_rom);
+
+    return 0;
+}
+
 /* Reserve space and add capability to the linked list in pci config space */
 int pci_add_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
 {
diff --git a/hw/pci.h b/hw/pci.h
index dc9b860..d25fe50 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -242,6 +242,9 @@ struct PCIDevice {
     uint32_t msix_bar_size;
     /* Version id needed for VMState */
     int32_t version_id;
+
+    /* Location of option rom */
+    ram_addr_t rom_offset;
 };
 
 PCIDevice *pci_register_device(PCIBus *bus, const char *name,
@@ -253,6 +256,8 @@ void pci_register_bar(PCIDevice *pci_dev, int region_num,
                             pcibus_t size, int type,
                             PCIMapIORegionFunc *map_func);
 
+int pci_add_option_rom(PCIDevice *pdev, const char *name);
+
 int pci_add_capability(PCIDevice *pci_dev, uint8_t cap_id, uint8_t cap_size);
 
 void pci_del_capability(PCIDevice *pci_dev, uint8_t cap_id, uint8_t cap_size);
diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index 9fd05a8..2cee97b 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -3357,7 +3357,7 @@ static int pci_rtl8139_init(PCIDevice *dev)
     if (!dev->qdev.hotplugged) {
         static int loaded = 0;
         if (!loaded) {
-            rom_add_option("pxe-rtl8139.bin");
+            pci_add_option_rom(&s->dev, "pxe-rtl8139.bin");
             loaded = 1;
         }
     }
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 4500130..85f14a2 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -522,7 +522,7 @@ static int virtio_net_init_pci(PCIDevice *pci_dev)
     if (!pci_dev->qdev.hotplugged) {
         static int loaded = 0;
         if (!loaded) {
-            rom_add_option("pxe-virtio.bin");
+            pci_add_option_rom(pci_dev, "pxe-virtio.bin");
             loaded = 1;
         }
     }