netdev - Re: [PATCH net-next 2/4] bpf: provide helper that indicates eBPF was migrated

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Message-ID: <55BA5B9C.6010406@plumgrid.com>
Date:	Thu, 30 Jul 2015 10:15:08 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <daniel@...earbox.net>, davem@...emloft.net
Cc:	holzheu@...ux.vnet.ibm.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/4] bpf: provide helper that indicates eBPF was
 migrated

On 7/30/15 3:42 AM, Daniel Borkmann wrote:
> During recent discussions we had with Michael, we found that it would
> be useful to have an indicator that tells the JIT that an eBPF program
> had been migrated from classic instructions into eBPF instructions, as
> only in that case A and X need to be cleared in the prologue. Such eBPF
> programs do not set a particular type, but all have BPF_PROG_TYPE_UNSPEC.
> Thus, introduce a small helper for cde66c2d88da ("s390/bpf: Only clear
> A and X for converted BPF programs") and possibly others in future.
>
> Signed-off-by: Daniel Borkmann<daniel@...earbox.net>
> Cc: Michael Holzheu<holzheu@...ux.vnet.ibm.com>

Acked-by: Alexei Starovoitov <ast@...mgrid.com>

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