image works in native but not in vm when cpu mode='host-passthrough' is set

[daggs]

Greetings Martin,

> Sent: Thursday, November 19, 2020 at 11:23 PM
> From: "Martin Kletzander" <mkletzan at redhat.com>
> To: "daggs" <daggs at gmx.com>
> Cc: "libvirt-usersredhat.com" <libvirt-users at redhat.com>
> Subject: Re: image works in native but not in vm when cpu mode='host-passthrough' is set
>
> On Tue, Nov 17, 2020 at 11:32:29AM +0100, daggs wrote:
> ...
> Not sure, but there might be some flags that are not passed through even with
> host-passthrough.  Virtualisation ones are definitely one of those that need to
> be enabled on top of host-passthrough.  The easiest thing to check that I can
> think of would be booting some live distro and checking the flags in
> /proc/cpuinfo and how are they different from your host.
>

I don't need livecd, I can diff both native and vm, see https://dpaste.com/ARETBEPCL
from what I can see, the vm is missing these flags: dts acpi tm pbe art pebs bts nonstop_tsc aperfmperf dtes64 monitor ds_cpl est tm2 sdbg xtpr pdcm epb intel_pt dtherm pln pts hwp hwp_notify hwp_act_window hwp_epp
and have these flags: tsc_known_freq hypervisor umip arch_capabilities

beside the acpi flag which I found strange to be messing, I can't think of any other flag which might be needed.

Dagg.