handling mmio?

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hi,

here is what i understand how mmio is handled in kvm.

- mmio range is registered with kvm from userspace.
- this range is then write-protected in kernel
- mmio write will be handled as page-fault inside kernel
- so there is no userspace is involved when mmio write is handled.

please can someone confirm this understanding is correct, or not?

many thanks,
Jun
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