On Wed, Jun 15, 2016 at 11:51:50AM -0300, Eduardo Habkost wrote:
> We have that: it is "-feature" (or "feature=off"). Features that
> can't be configured in the command-line should never appear to
> the guest unless you use "-cpu host,migratable=off".
>
> Something that allows disabling feature flags that still don't
> have a name in QEMU would be useful for "-cpu
> host,migratable=off" only (and that's an interesting suggestion).
> But that's not the case here, I guess.
Right, and I'm wondering whether something like that would be useful for
testing purposes. For example, I want to enable a CPUID feature on the
command line and see how the kernel I'm booting in the guest reacts. And
that feature bit is not necessarily known to qemu/kvm.
Can we, say, pass whole CPUID leafs to qemu to report to the guest?
I.e., something like:
... -cpuid=0x5,eax=0x40,ebx=0xdeadbeef,ecx=0xcaffee ...
and so on.
Would that be interesting to add to qemu? I'd find something like that
very useful for testing kernels...
Thanks.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
