On Sun, 17 Mar 2019 19:35:48 +0000 Marc Zyngier <marc.zyngier@xxxxxxx> wrote: [...] > A first approach would be to keep a small cache of the last few > successful translations for this ITS, cache that could be looked-up by > holding a spinlock instead. A hit in this cache could directly be > injected. Any command that invalidates or changes anything (DISCARD, > INV, INVALL, MAPC with V=0, MAPD with V=0, MOVALL, MOVI) should nuke > the cache altogether. And to explain what I meant with this, I've pushed a branch[1] with a basic prototype. It is good enough to get a VM to boot, but I wouldn't trust it for anything serious just yet. If anyone feels like giving it a go and check whether it has any benefit performance wise, please do so. Thanks, M. [1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=kvm-arm64/its-translation-cache -- Without deviation from the norm, progress is not possible.
