Re: [Qemu-devel] Nested SVM only enabled (by default) in pc-i440fx-2.1?

[Mark Kanda]

On 2/27/2019 4:05 PM, Mark Kanda wrote:
> Hi all,
>
> I noticed nested SVM is enabled only in pc-i440fx-2.1 (default is 
> disabled); this was added when 2.1 was the latest:
>
>      75d373ef97 ("target-i386: Disable SVM by default in KVM mode")
>
> However, this change was not carried forward to newer machine types. Is 
> this an oversight? Is there a reason we (still) need SVM disabled by 
> default?

To clarify, it's my understanding the above patch was added to disable 
nested SVM in pc-i440fx-2.2 (and future) machine types due to stability 
issues (while keeping it enabled in pc-i440fx-2.1 and previous machine 
types).

I'm wondering if nested SVM is now mature enough to remove this 
restriction and enable it by default (at least on recent machine types).

Thanks/regards,
-Mark