T2080 Virtualization Support

[siddalingaprasa]

Hi All,

I am pretty new to Linux, but we want to use T2080/2081 (e6500 core) in our custom board and we would like to run Linux as Host OS and VxWorks 5.4 as guest OS. VxWorks5.4 is 32 bit and is built for e500 core as we previously had MPC85xx (e500 core) based board. So my question is on the core/processor emulation. Should the Guest OS processor/core be emulated using QEMU for e500? If this is true, then all the VM instructions will trap into Host OS and there will be a huge performance penalty. Does KVM provide other means which it can exploit the T2081 hardware features so that we can overcome the bottleneck of processor/core emulation? Something like a pass-through from Guest to Physical core?

-Thanks and Regards,

Prasad.

[bpe]

When you say KVM, you already mean  most instructions are executed natively, not interpreted.

Only a few privileged instructions cause traps.

A basic description of what and how is emulated can be found here:

https://freescale.sdlproducts.com/LiveContent/content/en-US/QorIQ_SDK/GUID-9DEF2E13-2F31-47DC-8D38-D...

Refer to the VCPU specification Sections 2 and 3 for full details:

http://www.linux-kvm.org/page/E500_virtual_CPU_specification

A discussion of  overheads introduced by KVM can be found here:

https://freescale.sdlproducts.com/LiveContent/content/en-US/QorIQ_SDK/GUID-8ADAFC19-511D-48E5-9F95-6...

Have a great day,

Platon

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[siddalingaprasa]

Thanks for the information Platon.

-Regards,

Prasad.