On 5/15/24 22:05, Sean Christopherson wrote:
Again thinking of the userspace memory analogy... Aren't there some VMs where
the fast zap is faster? Like if you have guest with a small memslot that gets
deleted all the time, you could want it to be zapped specifically. But for the
giant memslot next to it, you might want to do the fast zap all thing.
Yes. But...
On the other hand, tearing down a giant memslot isn't really common.
The main occurrence of memslots going away is 1) BIOS fiddling with low
memory permissions; 2) PCI BARs. The former is only happening at boot
and with small memslots, the latter can in principle involve large
memslots but... just don't do it.
Paolo
