Re: [PATCH v2 8/8] DO NOT MERGE: Hack-a-test to verify gpc invalidation+refresh

From: David Woodhouse
Date: Wed Apr 27 2022 - 11:18:10 EST

On Wed, 2022-04-27 at 01:40 +0000, Sean Christopherson wrote:
> Add a VM-wide gfn=>pfn cache and a fake MSR to let userspace control the
> cache. On writes, reflect the value of the MSR into the backing page of
> a gfn=>pfn cache so that userspace can detect if a value was written to
> the wrong page, i.e. to a stale mapping.
> Spin up 16 vCPUs (arbitrary) to use/refresh the cache, and another thread
> to trigger mmu_notifier events and memslot updates.

Do you need the MSR hack? Can't you exercise this using Xen interrupt
delivery or runstate information and the same kind of thread setup?

Thanks for working on this!

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