linux-kernel - Re: [PATCH] net: filter: make JITs zero A for SKF_AD_ALU_XOR

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Message-ID: <20160105160345.GA3951@debian>
Date:	Tue, 5 Jan 2016 17:03:45 +0100
From:	Rabin Vincent <rabin@....in>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, daniel@...earbox.net,
	ast@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: filter: make JITs zero A for SKF_AD_ALU_XOR_X

On Tue, Jan 05, 2016 at 08:00:45AM -0800, Eric Dumazet wrote:
> On Tue, 2016-01-05 at 16:23 +0100, Rabin Vincent wrote:
> > The SKF_AD_ALU_XOR_X ancillary is not like the other ancillary data
> > instructions since it XORs A with X while all the others replace A with
> > some loaded value.  All the BPF JITs fail to clear A if this is used as
> > the first instruction in a filter.
> 
> Is x86_64 part of this 'All' subset ? ;)

No, because it's an eBPF JIT.
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