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SubjectRe: [RFC PATCH v3 0/5] x86/kvm: Virtual suspend time injection support
Hi Hikaru,

On Wed, 20 Oct 2021 13:04:25 +0100,
Hikaru Nishida <> wrote:
> Hi,
> This patch series adds virtual suspend time injection support to KVM.
> It is an updated version of the following series:
> v2:
> v1:
> 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?




Without deviation from the norm, progress is not possible.

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