From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.com>,
xen-devel <xen-devel@lists.xenproject.org>
Cc: Keir Fraser <keir@xen.org>,
Aravind Gopalakrishnan <aravind.gopalakrishnan@amd.com>,
suravee.suthikulpanit@amd.com
Subject: Re: [PATCH] x86emul: support clzero
Date: Wed, 23 Sep 2015 18:37:31 +0100 [thread overview]
Message-ID: <5602E35B.4060704@citrix.com> (raw)
In-Reply-To: <56016E8102000078000A45B7@prv-mh.provo.novell.com>
On 22/09/15 14:06, Jan Beulich wrote:
> ... in anticipation of this possibly going to get used by guests for
> basic thinks like memset() or clearing or pages.
>
> Since the emulation doesn't use clzero itself, checking the guest's
> CPUID for the feature to be exposed is (intentionally) being avoided
> here. All that's required is sensible guest side data for the clflush
> line size.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Where have you found this instruction? Googling, I have found a
presentation talking about it being new in the new AMD Zen cores, but I
still can't locate any technical documentation on the matter.
~Andrew
next prev parent reply other threads:[~2015-09-23 17:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-22 13:06 [PATCH] x86emul: support clzero Jan Beulich
2015-09-23 17:37 ` Andrew Cooper [this message]
2015-09-24 8:02 ` Jan Beulich
2015-09-24 11:59 ` Andrew Cooper
2015-09-24 12:13 ` Jan Beulich
2015-10-08 10:26 ` Jan Beulich
2016-01-11 15:55 ` Aravind Gopalakrishnan
2016-01-13 15:10 ` Andrew Cooper
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