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Only the VM knows how it will use this memory and VM's do > > actually execute out of the cachable PFNMAP VMA today. The VM will set > > any execute deny/allow on its S1 table according to how it uses the > > memory. > > If S2 is executable, wouldn't KVM try to invalidate the I-cache and it > won't have an alias to do this? Unless it doesn't end up in > stage2_map_walker_try_leaf() or the walk has been flagged as skipping > the CMO. Okay, that does seem to have been overlooked a bit. The answer I got back is: Cachable PFNMAP is also relying on ARM64_HAS_CACHE_DIC also, simlar to how S2FWB allows KVM to avoid flushing the D cache, that CPU cap allows KVM to avoid flushing the icache and turns icache_inval_pou() into a NOP. Ankit, you should add that check as well.. Thanks, Jason