On 21 May 2014 17:33, Sergey Fedorov <serge.f...@gmail.com> wrote: > On 21.05.2014 20:14, Christopher Covington wrote: >> On 05/21/2014 10:46 AM, Peter Maydell wrote: >>> (Also I'm not sure what the semantics of -kernel should be for >>> TZ-supporting CPUs -- boot the kernel in S or NS ?) >> While Linux works in secure mode, non-secure hypervisor mode is required for >> KVM to work in the guest. >> >> "[Entry] in HYP mode ... is the recommended boot method ...." >> >> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm/Booting#n183
Sure, but we don't implement HYP yet :-) > AFAIK, in real hardware this switch to non-secure state is actually done > by bootloader. Why don't implement this in Qemu bootloader stub so far? If we want to have -kernel boot in NS then yes, the bootloader stub is the place that code should go. The difficulty with -kernel being NS is that some guest kernels for some boards may be assuming that they will run in secure state and can directly access h/w or registers which aren't accessible from NS. I guess we need to implement it and then see if any of our guest images stop working... thanks -- PMM
