On 23/05/2023 08:43, Luca Fancellu wrote:
Enable Xen to handle the SVE extension, add code in cpufeature module to handle ZCR SVE register, disable trapping SVE feature on system boot only when SVE resources are accessed. While there, correct coding style for the comment on coprocessor trapping. Now cptr_el2 is part of the domain context and it will be restored on context switch, this is a preparation for saving the SVE context which will be part of VFP operations, so restore it before the call to save VFP registers. To save an additional isb barrier, restore cptr_el2 before an existing isb barrier and move the call for saving VFP context after that barrier. To keep a (mostly) specularity of ctxt_switch_to() and ctxt_switch_from(), move vfp_save_state() up in the function. Change the KConfig entry to make ARM64_SVE symbol selectable, by default it will be not selected. Create sve module and sve_asm.S that contains assembly routines for the SVE feature, this code is inspired from linux and it uses instruction encoding to be compatible with compilers that does not support SVE, imported instructions are documented in README.LinuxPrimitives. Signed-off-by: Luca Fancellu <luca.fance...@arm.com>
Acked-by: Julien Grall <jgr...@amazon.com> Cheers, -- Julien Grall
