[vfio-users] OVMF + OS X El Capitan + 970 gtx passthrough = Success

[Sergey Vlasov]

Try `busratio` kernel flag. It can be calculated as cpu speed / external
clock.

sudo dmidecode | grep MHz
    External Clock: 100 MHz
    Max Speed: 3800 MHz
    Current Speed: 3600 MHz
    Speed: 1600 MHz
    Configured Clock Speed: 1600 MHz
    Speed: 1600 MHz
    Configured Clock Speed: 1600 MHz

My bus ratio would be 3600 / 100 = 35. If it works, you can add it
permanently to `com.apple.boot.plist`.

On 3 November 2015 at 17:13, francesco dicarlo <evilsephiroth at gmail.com>
wrote:

> I want to confirm an almost completely success with
> MAC OS X El capitan with OVMF...
>
> Credits goes to user washbenzin on InsanelyMac
>
>
> http://www.insanelymac.com/forum/topic/309087-insanely-fast-virtual-mac-qemu-ovmf-clover-and-native-graphics/
>
> Replicated the setup, it's working almost flawlessly.
>
> There's only one problem linked to clover handling bus speed.
>
> Mac Os is too accelerated due to wrong bus speed.
>
> Only way to handling correctly is to modify kvm module to hard code bus
> speed.
>
> If anyone want to give some hints, it would be nice to have a perfect
> mackintosh vm with gpu passthrough.
>
> Regards
>
> Francesco Dicarlo
>
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