Re: [PATCH] arm64: KVM: Guests can skip __install_bp_hardening_cb()s HYP work

[Marc Zyngier <marc.zyngier@arm.com>]

On 21/09/18 21:49, James Morse wrote:
> enable_smccc_arch_workaround_1() passes NULL as the hyp_vecs start and
> end if the HVC conduit is in use, and ARM_SMCCC_ARCH_WORKAROUND_1 is
> detected.
> 
> If the guest kernel happened to be built with KVM_INDIRECT_VECTORS,
> we go on to allocate a slot, memcpy() the empty workaround in and
> do the appropriate cache maintenance.
> 
> This works as we always tell memcpy() the range is 0, so it never
> accesses the NULL src pointer, but we still do the cache maintenance.
> 
> If hyp_vecs_start is NULL we know we're a guest, just update the fn
> like the !KVM_INDIRECT_VECTORS version.
> 
> Signed-off-by: James Morse <james.morse@arm.com>
> Reviewed-by: Julien Thierry <julien.thierry@arm.com>

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

Catalin: could you sneak this one in for 4.20? It is strictly a KVM
patch, but its location makes it more suitable for the arm64 tree...

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...