RE: [PATCH v3 11/11] iommu/vt-d: Convert global spinlock into per domain lock

[Tian, Kevin]

> From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Wednesday, June 29, 2022 3:47 PM
> 
> Using a global device_domain_lock spinlock to protect per-domain device
> tracking lists is an inefficient way, especially considering this lock
> is also needed in the hot paths. This optimizes the locking mechanism
> by converting the global lock to per domain lock.
> 
> On the other hand, as the device tracking lists are never accessed in
> any interrupt context, there is no need to disable interrupts while
> spinning. Replace irqsave variant with spinlock calls.
> 
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

except the previous comment on where to convert spin_lock_irqsave()
the rest looks good to me.

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>