[SeaBIOS] [PATCH] pci: fixes to allow booting from extra root pci buses.
Marcel Apfelbaum
marcel at redhat.com
Thu Jun 11 14:51:31 CEST 2015
On 06/11/2015 03:45 PM, Michael S. Tsirkin wrote:
> 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?
A QEMU unit-test you mean?
By the way, I found an issue with this patch, please do
not merge it yet.
>
> Also can you please quote the open firmware spec text
> that says this is the correct format?
Laszlo has found something, I'll look up something to quote, sure.
Thanks,
Marcel
>
>> ---
>> 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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