[Xen-devel] Re: [PATCH] xen: Remove hanging references to CONFIG_XEN_PLATFORM_PCI

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

On 10/20/2011 06:28 AM, Stefano Stabellini wrote:
> On Wed, 19 Oct 2011, Daniel De Graaf wrote:
>> In 5fbdc10395cd500d6ff844825a918c4e6f38de37 the XEN_PLATFORM_PCI config
>> option was removed, but references in header files remained. Clean up
>> those references.
>>
>> Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
> 
> Good catch, thanks!
> 

This didn't make it into 3.2-rc1, and I don't see it on any of Konrad's
git trees. The CONFIG_XEN_PVHVM change breaks PV-on-HVM drivers without
this patch because the grant table is not initialized:

[    3.667543] Event-channel device installed.
[    3.669093] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
...
[    3.775482] vbd vbd-51712: 28 granting access to ring page
[    3.777126] vbd vbd-51712: 28 xenbus_dev_probe on device/vbd/51712
[    3.778649] vbd: probe of vbd-51712 failed with error -28
[    3.783523] ata_piix 0000:00:01.1: version 2.13
[    3.784001] ata_piix 0000:00:01.1: setting latency timer to 64
[    3.785453] scsi0 : ata_piix
[    3.786886] scsi1 : ata_piix
[    3.788174] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc160 irq 14
[    3.789444] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc168 irq 15
[    3.790958] Fixed MDIO Bus: probed
[    3.793015] Initialising Xen virtual ethernet driver.
[    3.795331] #### netfront can't alloc tx grant refs
[    3.797402] vif vif-0: 12 creating netdev
[    3.798859] vif vif-0: 12 xenbus_dev_probe on device/vif/0
[    3.800777] vif: probe of vif-0 failed with error -12

Versus a boot with working pv-hvm drivers:
[    3.284850] Event-channel device installed.
[    3.286468] xen: --> pirq=22 -> irq=28 (gsi=28)
[    3.286471] xen-platform-pci 0000:00:03.0: PCI INT A -> GSI 28 (level, low) 
-> IRQ 28
[    3.288181] Grant table initialized
[    3.289598] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
...

>> ---
>>  include/xen/platform_pci.h |    6 ++----
>>  1 files changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/include/xen/platform_pci.h b/include/xen/platform_pci.h
>> index a785a3b..438c256 100644
>> --- a/include/xen/platform_pci.h
>> +++ b/include/xen/platform_pci.h
>> @@ -29,8 +29,7 @@
>>  static inline int xen_must_unplug_nics(void) {
>>  #if (defined(CONFIG_XEN_NETDEV_FRONTEND) || \
>>              defined(CONFIG_XEN_NETDEV_FRONTEND_MODULE)) && \
>> -            (defined(CONFIG_XEN_PLATFORM_PCI) || \
>> -             defined(CONFIG_XEN_PLATFORM_PCI_MODULE))
>> +            defined(CONFIG_XEN_PVHVM)
>>          return 1;
>>  #else
>>          return 0;
>> @@ -40,8 +39,7 @@ static inline int xen_must_unplug_nics(void) {
>>  static inline int xen_must_unplug_disks(void) {
>>  #if (defined(CONFIG_XEN_BLKDEV_FRONTEND) || \
>>              defined(CONFIG_XEN_BLKDEV_FRONTEND_MODULE)) && \
>> -            (defined(CONFIG_XEN_PLATFORM_PCI) || \
>> -             defined(CONFIG_XEN_PLATFORM_PCI_MODULE))
>> +            defined(CONFIG_XEN_PVHVM)
>>          return 1;
>>  #else
>>          return 0;
>> -- 
>> 1.7.6.4
>>
> 
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