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Re: [Qemu-devel] [PATCH 1/2] seccomp: Whitelist cacheflush since 2.2.0 n

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 1/2] seccomp: Whitelist cacheflush since 2.2.0 not 2.2.3
Date: Fri, 8 Apr 2016 13:49:44 +0100

On 8 April 2016 at 13:39, Andrew Jones <address@hidden> wrote:
> In that message I was referring to arm/aarch64 (the only arch at the
> time that cared about cacheflush). 2.2.0 was the first version arm got
> any cacheflush support (same version as x86 an mips), but it was
> completely wrong until 2.2.1. Additional problems were then fixed for
> 2.2.3. x86 doesn't use cacheflush and mips didn't have any problems
> (I guess), so they've been fine since 2.2.0.
> As long as the configure script still requires a libseccomp_minver of
> 2.2.3 for arm/aarch64, then it doesn't matter if the HAVE_CACHEFLUSH
> minimum version in qemu-seccomp.c is relaxed for the other
> architectures that work.

OK. Could we have a comment, maybe something like:
 /* For some architectures (notably ARM) cacheflush is not
  * supported until libseccomp 2.2.3, but configure enforces that
  * we are using a more recent version on those hosts, so it is OK
  * for this check to be less strict.

? (or feel free to reword if you have a better idea).

-- PMM

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