Re: Softmmu conflict with KVM?

[Graf (AWS), Alexander]

> Am 25.02.2021 um 20:34 schrieb Mark Cave-Ayland 
> <mark.cave-ayland@ilande.co.uk>:
> 
>> On 25/02/2021 17:41, Jd Lyons wrote:
>> 
>> Something I’ve noticed with Qemu-ppc and KVM on real PPC hardware, it’s so 
>> slow under OS X that it’s pretty much unusable, even if you can get it to 
>> boot and run.
>> 
>> However Mac-On_Linux using KVM is pretty close to native speeds, so I don’t 
>> think it’s an issue with KVM, I think it’s an issue with Qemu-ppc.
>> 
>> Should the softmmu be active in KVM mode?
>> 
>> I don’t know if the CPU’s MMU is handed to the guest with KVM, but I suspect 
>> there is a conflict, and we are not properly handling memory management in 
>> KVM mode on PPC.
> 
> Can you be specific about the PPC CPU and versions of OS X you are using 
> here? I
> believe MoL has extra optimisations to improve running OS X under 
> virtualisation, but
> Alex (added as CC) will be able to give you a bit more information.

Please also provide the QEMU command line you used to run osx on Linux with KVM.

And yes, MoL has a few tricks it plays to accelerate execution (binary patching 
macOS to trap less). At least on my G5, things were usable enough without those 
as well though.


Alex




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