[PATCH v2 3/4] arm64: Require that system registers at all visible ELs be initialized

[Marc Zyngier]

On Thu, 01 Apr 2021 19:09:41 +0100,
Mark Brown <broonie at kernel.org> wrote:
> 
> Currently we require that software at a higher exception level initialise
> all registers at the exception level the kernel will be entered prior to
> starting the kernel in order to ensure that there is nothing uninitialised
> which could result in an UNKNOWN state while running the kernel. The
> expectation is that the software running at the highest exception levels
> will be tightly coupled to the system and can ensure that all available
> features are appropriately initialised and that the kernel can initialise
> anything else.
> 
> There is a gap here in the case where new registers are added to lower
> exception levels that require initialisation but the kernel does not yet
> understand them. Extend the requirement to also include exception levels
> below the one where the kernel is entered to cover this.
> 
> Suggested-by: Catalin Marinas <catalin.marinas at arm.com>
> Signed-off-by: Mark Brown <broonie at kernel.org>

Acked-by: Marc Zyngier <maz at kernel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.