Jan Kiszka wrote:
Out of curiosity: What's the mechanism to update the shadow table after swap-out/swap-in?
With mmu notifiers, the kernel informs kvm that a host pte has been invalidated, kvm looks in its reverse mappings and drops any sptes that correspond to the same hva.
Without mmu notifiers, the page reference count is kept elevated, so the kernel can't swap anything which has an spte pointing to it.
In both cases, the spte is reestablished on first guest access (which may or may not be immediately after swapin).
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