Date: Tue, 2 Jan 2018 19:56:48 -0500 From: Michael Butler <imb@protected-networks.net> To: Cy Schubert <Cy.Schubert@komquats.com>, Warner Losh <imp@bsdimp.com> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Intel CPU design flaw - FreeBSD affected? Message-ID: <5787e63c-9a88-c807-c132-572e8454a4d0@protected-networks.net> In-Reply-To: <20180103001949.6AF4F2C9@spqr.komquats.com> References: <20180103001949.6AF4F2C9@spqr.komquats.com>
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On 01/02/18 19:20, Cy Schubert wrote: > This Linux commit gives us a hint. > > https://lkml.org/lkml/2017/12//27/2 Sadly, the articles I've read to date make no mention of which Intel silicon revs are vulnerable. However, the use of the PCID feature, which is only available on more recent CPUs, does seem to afford a slightly lesser performance hit when completely splitting the kernel and user address space mappings :-( imb
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