[RFC] Support for Arm CCA VMs on Linux

[Suzuki K Poulose]

On 03/03/2023 09:46, Jean-Philippe Brucker wrote:
> On Thu, Mar 02, 2023 at 07:12:24AM +0900, Itaru Kitayama wrote:
>>>> I've tried your series in Real on CCA Host, but the KVM arch init
>>>> emits an Invalid argument error and terminates.
> 
> This was the KVM_SET_ONE_REG for the SVE vector size. During my tests I
> didn't enable SVE in the host but shrinkwrap enables more options.

Does the Qemu check for SVE capability on /dev/kvm ? For kvmtool, we
changed to using the VM instance and that would prevent using SVE,
until the RMM supports it.

Suzuki

> 
> Until we figure out support for SVE, disable it on the QEMU command-line
> (similarly to '--disable-sve' needed for kvmtool boot):
> 
> 	-cpu host,sve=off
> 
> Thanks,
> Jean