Re: [PATCH v3 00/34] KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush feature

Vitaly Kuznetsov
2022-05-03T15:04:47Z

Vitaly Kuznetsov <vkuznets@redhat.com> writes:

> Changes since v1:

This should've beed 'since v2', obviously.

...

>
> Currently, KVM handles HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST{,EX} requests
> by flushing the whole VPID and this is sub-optimal. This series introduces
> the required mechanism to make handling of these requests more
> fine-grained by flushing individual GVAs only (when requested). On this
> foundation, "Direct Virtual Flush" Hyper-V feature is implemented. The
> feature allows L0 to handle Hyper-V TLB flush hypercalls directly at
> L0 without the need to reflect the exit to L1. This has at least two
> benefits: reflecting vmexit and the consequent vmenter are avoided + L0
> has precise information whether the target vCPU is actually running (and
> thus requires a kick).

FWIW, patches still apply cleanly to kvm/queue so probably there's no
need to resend.

--
Vitaly