Re: [PATCH 0/3] KVM: support the cpu feature FLUSH_L1D

[Jim Mattson]

On Wed, Feb 1, 2023 at 5:29 AM Emanuele Giuseppe Esposito
<eesposit@xxxxxxxxxx> wrote:
>
> As the title suggest, if the host cpu supports flush_l1d flag and
> QEMU/userspace wants to boot a VM with the same flag (or emulate same
> host features), KVM should be able to do so.
>
> Patch 3 is the main fix, because if flush_l1d is not advertised by
> KVM, a linux VM will erroneously mark
> /sys/devices/system/cpu/vulnerabilities/mmio_stale_data
> as vulnerable, even though it isn't since the host has the feature
> and takes care of this. Not sure what would happen in the nested case though.
>
> Patch 1 and 2 are just taken and refactored from Jim Mattison's serie that it
> seems was lost a while ago:
> https://patchwork.kernel.org/project/kvm/patch/20180814173049.21756-1-jmattson@xxxxxxxxxx/
>
> I thought it was worth re-posting them.

What has changed since the patches were originally posted, and Konrad
dissed them?