Re: [PATCH v5 7/9] vfio/pci: Clean up BAR zap and revocation

[Matt Evans]

Hi Alex,

On 29/07/2026 18:52, Alex Williamson wrote:
> On Wed, 15 Jul 2026 18:47:30 +0100
> Matt Evans <matt@xxxxxxxxxx> wrote:
>> diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
>> index 9a1674c152aa..e2b4252e7c3f 100644
>> --- a/include/linux/vfio_pci_core.h
>> +++ b/include/linux/vfio_pci_core.h
>> @@ -134,6 +134,7 @@ struct vfio_pci_core_device {
>>  	bool			pm_intx_masked;
>>  	bool			pm_runtime_engaged;
>>  	bool			sriov_active;
>> +	bool			zap_bars_on_revoke;
>>  	struct pci_saved_state	*pci_saved_state;
>>  	struct pci_saved_state	*pm_save;
>>  	int			ioeventfds_nr;
> 
> This should be in the bitfield usage group since it's only modified at
> init time.

This was intentional, but happy to change it if you're certain ofc.  Is
it inconceivable that a sub-driver could set it after init?  I'd say
they _shouldn't_, but only review will stop them and this placement
intended to be cautious.  It seemed a low cost way to avoid issues
around synchronisation on the bitfield.

Thanks,


Matt