Re: [Xen-devel] [edk2-devel] [PATCH v2 24/31] OvmfPkg/XenPlatformPei: Ignore missing PCI Host Bridge on Xen PVH

[Laszlo Ersek <lersek@xxxxxxxxxx>]

On 04/15/19 15:29, Laszlo Ersek wrote:
> On 04/09/19 13:08, Anthony PERARD wrote:
>> When the device ID of the host bridge is unknown, check if we are
>> running as a PVH guest as there is no PCI bus in that case.
>>
>> Contributed-under: TianoCore Contribution Agreement 1.1
>> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
>> ---
>>
>> Notes:
>>     v2:
>>     - Use new XEN_PVH_PCI_HOST_BRIDGE_DEVICE_ID macro
>>
>>  OvmfPkg/Include/OvmfPlatforms.h   | 6 ++++++
>>  OvmfPkg/XenPlatformPei/Platform.c | 7 +++++++
>>  2 files changed, 13 insertions(+)
>>
>> diff --git a/OvmfPkg/Include/OvmfPlatforms.h 
>> b/OvmfPkg/Include/OvmfPlatforms.h
>> index cc67f40a88..1ce71e18ec 100644
>> --- a/OvmfPkg/Include/OvmfPlatforms.h
>> +++ b/OvmfPkg/Include/OvmfPlatforms.h
>> @@ -43,4 +43,10 @@
>>  //
>>  #define ACPI_TIMER_OFFSET 0x8
>>  
>> +//
>> +// When running OVMF on a Xen PVH guest there is no PCI,
>> +// so -1 is return for the Host Bridge Device ID.
>> +//
>> +#define XEN_PVH_PCI_HOST_BRIDGE_DEVICE_ID 0xFFFF
>> +
>>  #endif
> 
> We split the i440fx and Q35 host bridge device IDs to separate files,
> under "OvmfPkg/Include/IndustryStandard/", in commit cb2e300766ae
> ("OvmfPkg: split Include/OvmfPlatforms.h", 2015-05-13).
> 
> (1) I'd prefer if we could introduce the above macro similarly -- and
> include that header only in XenPlatformPei (plus wherever else it is
> necessary).

sorry, for a second I missed:

#include <IndustryStandard/Q35MchIch9.h>
#include <IndustryStandard/I440FxPiix4.h>

in "OvmfPlatforms.h". So it's fine to #include the new Xen-specific
header in "OvmfPlatforms.h", centrally.

Thanks
Laszlo


> 
> Thanks!
> Laszlo
> 
> 
>> diff --git a/OvmfPkg/XenPlatformPei/Platform.c 
>> b/OvmfPkg/XenPlatformPei/Platform.c
>> index 5e6d553ad5..d91cd98bf4 100644
>> --- a/OvmfPkg/XenPlatformPei/Platform.c
>> +++ b/OvmfPkg/XenPlatformPei/Platform.c
>> @@ -278,6 +278,13 @@ MiscInitialization (
>>        AcpiEnBit  = ICH9_ACPI_CNTL_ACPI_EN;
>>        break;
>>      default:
>> +      if (XenPvhDetected ()) {
>> +        //
>> +        // There is no PCI bus in this case
>> +        //
>> +        PcdSet16S (PcdOvmfHostBridgePciDevId, 
>> XEN_PVH_PCI_HOST_BRIDGE_DEVICE_ID);
>> +        return;
>> +      }
>>        DEBUG ((EFI_D_ERROR, "%a: Unknown Host Bridge Device ID: 0x%04x\n",
>>          __FUNCTION__, mHostBridgeDevId));
>>        ASSERT (FALSE);
>>
> 


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