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SubjectRe: [RFC 03/12] KVM/VMX: Use the new host mapping API for virtual_apic_page
On Fri, Feb 9, 2018 at 4:15 AM, KarimAllah Ahmed <karahmed@amazon.com> wrote:

> Can you elaborate a bit? I do not really understand what is the concern.

I can't find the posting that gave me this impression. The only thing
I can find is the following in Documentation/vm/highmem.txt:

(*) kmap(). This permits a short duration mapping of a single page. It needs
global synchronization, but is amortized somewhat. It is also prone to
deadlocks when using in a nested fashion, and so it is not recommended for
new code.

What constitutes a "short duration," and does this new usage qualify?

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