lguest: add a dummy PCI host bridge.

Otherwise Linux fails to find the bus.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c
index eafdaf2..c8930bc 100644 (file)
--- a/tools/lguest/lguest.c
+++ b/tools/lguest/lguest.c
@@ -1238,6 +1238,17 @@ static void handle_output(unsigned long addr)
  * code.
  */
 
+/* Linux expects a PCI host bridge: ours is a dummy, and first on the bus. */
+static struct device pci_host_bridge;
+
+static void init_pci_host_bridge(void)
+{
+       pci_host_bridge.name = "PCI Host Bridge";
+       pci_host_bridge.config.class = 0x06; /* bridge */
+       pci_host_bridge.config.subclass = 0; /* host bridge */
+       devices.pci[0] = &pci_host_bridge;
+}
+
 /* The IO ports used to read the PCI config space. */
 #define PCI_CONFIG_ADDR 0xCF8
 #define PCI_CONFIG_DATA 0xCFC
@@ -3007,6 +3018,9 @@ int main(int argc, char *argv[])
        /* We always have a console device */
        setup_console();
 
+       /* Initialize the (fake) PCI host bridge device. */
+       init_pci_host_bridge();
+
        /* Now we load the kernel */
        start = load_kernel(open_or_die(argv[optind+1], O_RDONLY));