Re: [PATCH v2 01/20] locking/rt: Use raw_spin_lock_irqsave() in __rwbase_read_unlock()

[David Woodhouse]

On Sat, 2026-05-30 at 12:26 +0200, Paolo Bonzini wrote:
> 
> Yeah, I think so.
> 
> The write side needs kvm->srcu so it would have to be yet another SRCU. 
> I initially thought that sucks for the code that calls kvm_gpc_check(), 
> but maybe not because it simply replaces read_lock/read_unlock.
> 
> By using a seqcount for the data, SRCU only needs to be synchronized in 
> gpc_unmap().  So, something like this:

It isn't just gpc_unmap() which does the invalidation. We also
invalidate from the MMU notifier in gfn_to_pfn_cache_invalidate_start()
which would also have to synchronize, wouldn't it?

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