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 24af81ceb1..b08d2aed75 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 8566fe3276..f7956010f1 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 086da4f834..b037fd8902 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 dc9b8604fe..d25fe507e0 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 9fd05a8a1b..2cee97bb7f 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 450013091c..85f14a2c23 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;
         }
     }