[PATCH v2 02/36] KVM: arm64: Rework hyp_panic for VHE and non-VHE

[Marc Zyngier]

On Thu, 07 Dec 2017 17:05:56 +0000,
Christoffer Dall wrote:
> 
> VHE actually doesn't rely on clearing the VTTBR when returning to the
> host kernel, and that is the current key mechanism of hyp_panic to
> figure out how to attempt to return to a state good enough to print a
> panic statement.
> 
> Therefore, we split the hyp_panic function into two functions, a VHE and
> a non-VHE, keeping the non-VHE version intact, but changing the VHE
> behavior.
> 
> The vttbr_el2 check on VHE doesn't really make that much sense, because
> the only situation where we can get here on VHE is when the hypervisor
> assembly code actually called into hyp_panic, which only happens when
> VBAR_EL2 has been set to the KVM exception vectors.  On VHE, we can
> always safely disable the traps and restore the host registers at this
> point, so we simply do that unconditionally and call into the panic
> function directly.
> 
> Signed-off-by: Christoffer Dall <christoffer.dall at linaro.org>

Acked-by: Marc Zyngier <marc.zyngier at arm.com>

	M.

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