Hi Hikaru, On Wed, 20 Oct 2021 13:04:25 +0100, Hikaru Nishida <hikalium@xxxxxxxxxxxx> wrote: > > > Hi, > > This patch series adds virtual suspend time injection support to KVM. > It is an updated version of the following series: > v2: > https://lore.kernel.org/kvm/20210806100710.2425336-1-hikalium@xxxxxxxxxxxx/ > v1: > https://lore.kernel.org/kvm/20210426090644.2218834-1-hikalium@xxxxxxxxxxxx/ > > Please take a look again. > > To kvm/arm64 folks: > I'm going to implement this mechanism to ARM64 as well but not > sure which function should be used to make an IRQ (like kvm_apic_set_irq > in x86) and if it is okay to use kvm_gfn_to_hva_cache / > kvm_write_guest_cached for sharing the suspend duration. Before we discuss interrupt injection, I want to understand what this is doing, and how this is doing it. And more precisely, I want to find out how you solve the various problems described by Thomas here [1]. Assuming you solve these, you should model the guest memory access similarly to what we do for stolen time. As for injecting an interrupt, why can't this be a userspace thing? Thanks, M. [1] https://lore.kernel.org/all/871r557jls.ffs@tglx -- Without deviation from the norm, progress is not possible.
