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lguest: add a dummy PCI host bridge.

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Otherwise Linux fails to find the bus.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2015-02-11 15:15:12 +10:30
parent 3e0e5f2640
commit 8e70946943
1 changed files with 14 additions and 0 deletions
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14
tools/lguest/lguest.c
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@ -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));