Re: [PATCH] powerpc/kvm/book3s64/vio: fix some RCU-list locks

From: Paul Mackerras
Date: Tue May 26 2020 - 21:13:31 EST

On Sun, May 10, 2020 at 01:18:34AM -0400, Qian Cai wrote:
> It is unsafe to traverse kvm->arch.spapr_tce_tables and
> stt->iommu_tables without the RCU read lock held. Also, add
> cond_resched_rcu() in places with the RCU read lock held that could take
> a while to finish.

This mostly looks fine. The cond_resched_rcu() in kvmppc_tce_validate
doesn't seem necessary (the list would rarely have more than a few
dozen entries) and could be a performance problem given that TCE
validation is a hot-path.

Are you OK with me modifying the patch to take out that
cond_resched_rcu(), or is there some reason why it's essential that it
be there?