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

[Martin Kletzander]

On Fri, Nov 20, 2020 at 08:06:08AM +0100, daggs wrote:
>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.
>

I'm sorry to say that, but nobody else here provides expertise, maybe extracting
the qemu command-lines from the logs and asking on qemu-users might be the best
next step. Sorry I cannot help you more as I do not see anything immediately
obvious here.

Martin

>Dagg.
>
>
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