[SeaBIOS] [PATCH] pci: fixes to allow booting from extra root pci buses.
Michael S. Tsirkin
mst at redhat.com
Thu Jun 11 14:45:13 CEST 2015
On Thu, Jun 11, 2015 at 03:41:35PM +0300, Marcel Apfelbaum wrote:
> The PXB device exposes a new pci root bridge with the
> fw path: /pci-root at 4/..., in which 4 is the root bus number.
> Before this patch the fw path was wrongly computed:
> /pci-root at 1/pci at i0cf8/...
> Fix the above issues: Correct the bus number and remove the
> extra host bridge description.
>
> Signed-off-by: Marcel Apfelbaum <marcel at redhat.com>
I would like a unit test for various paths, they
are part of guest ABI so we can never change them.
Could you add a unit test please?
Also can you please quote the open firmware spec text
that says this is the correct format?
> ---
> Laszlo worked on supporting pxb for OVMF and discovered
> that there is a problem when booting devices from a PXB.
>
> This is a link to the latest QEMU series:
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg302493.html
>
> Thanks,
> Marcel
>
> src/boot.c | 1 -
> src/hw/pci.c | 2 +-
> 2 files changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/src/boot.c b/src/boot.c
> index ec59c37..a3bb13b 100644
> --- a/src/boot.c
> +++ b/src/boot.c
> @@ -114,7 +114,6 @@ build_pci_path(char *buf, int max, const char *devname, struct pci_device *pci)
> } else {
> if (pci->rootbus)
> p += snprintf(p, max, "/pci-root@%x", pci->rootbus);
> - p += snprintf(p, buf+max-p, "%s", FW_PCI_DOMAIN);
> }
>
> int dev = pci_bdf_to_dev(pci->bdf), fn = pci_bdf_to_fn(pci->bdf);
> diff --git a/src/hw/pci.c b/src/hw/pci.c
> index 0379b55..9e77af4 100644
> --- a/src/hw/pci.c
> +++ b/src/hw/pci.c
> @@ -133,7 +133,7 @@ pci_probe_devices(void)
> if (bus != lastbus)
> rootbuses++;
> lastbus = bus;
> - rootbus = rootbuses;
> + rootbus = bus;
> if (bus > MaxPCIBus)
> MaxPCIBus = bus;
> } else {
> --
> 2.1.0
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