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From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Konrad Wilk <konrad.wilk@oracle.com>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"lenb@kernel.org" <lenb@kernel.org>
Subject: Re: [Xen-devel] Is: axe read_tscp pvops call. Was: Re: [RFC] ACPI S3 and Xen (suprisingly small\!).
Date: Thu, 18 Oct 2012 17:44:22 +0100	[thread overview]
Message-ID: <alpine.DEB.2.02.1210181737390.2689@kaball.uk.xensource.com> (raw)
In-Reply-To: <20121018161659.GA20354@x1.osrc.amd.com>

On Thu, 18 Oct 2012, Borislav Petkov wrote:
> On Thu, Oct 18, 2012 at 08:56:40AM -0700, Dan Magenheimer wrote:
> > I agree the whole idea of paravirtualization is a hack, but it is a
> > hack to workaround some poor architectural design decisions many years
> > ago by Intel processor designers who should have known better. Go yell
> > at them.
> >
> > Worse, the rdtscp instruction was a poor design decision by AMD
> > processor designers to hack around tsc skew problems. Go yell at them
> > too.
> >
> > And both Intel and AMD chose to perpetuate the problem with a
> > complicated VT/SVM implementation that will never perform as well as
> > native. At least they tried ;-)
> 
> Looks like xen people seem to know better so maybe they should design
> their own processor, add xen support for it and leave the linux kernel
> alone so that both camps can finally get on with their lives.

I know that it is obvious but it is worth stating it in clear letters:

these are Dan's personal opinions and by no means represent the position
of the Xen community as a whole on this topic.

I, for one, have no idea what he is talking about.

  reply	other threads:[~2012-10-18 16:44 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-17 13:49 [RFC] ACPI S3 and Xen (suprisingly small\!) Konrad Rzeszutek Wilk
2012-10-17 13:49 ` [PATCH 1/4] x86/wakeup/sleep: Check whether the TSS GDT descriptor is empty before using it Konrad Rzeszutek Wilk
2012-10-18  0:03   ` H. Peter Anvin
2012-10-18 14:47     ` Konrad Rzeszutek Wilk
2012-10-18 15:01       ` H. Peter Anvin
2013-01-17 14:41     ` Konrad Rzeszutek Wilk
2012-10-17 13:49 ` [PATCH 2/4] xen/lowlevel: Implement pvop call for load_idt (sidt) Konrad Rzeszutek Wilk
2012-10-17 23:51   ` H. Peter Anvin
2012-10-18 14:45     ` Konrad Rzeszutek Wilk
2012-10-18 15:02       ` H. Peter Anvin
2013-01-17 14:36     ` Konrad Rzeszutek Wilk
2012-10-17 13:49 ` [PATCH 3/4] xen/lowlevel: Implement pvop call for store_gdt (gidt) Konrad Rzeszutek Wilk
2012-10-17 13:49 ` [PATCH 4/4] xen/acpi: Prep saved_context cr3 values Konrad Rzeszutek Wilk
2013-01-17 14:48   ` Konrad Rzeszutek Wilk
2012-10-17 16:03 ` [RFC] ACPI S3 and Xen (suprisingly small\!) H. Peter Anvin
2012-10-17 16:10   ` Is: axe read_tscp pvops call. Was: " Konrad Rzeszutek Wilk
2012-10-17 16:39     ` Konrad Rzeszutek Wilk
2012-10-17 16:54       ` H. Peter Anvin
2012-10-17 16:50     ` H. Peter Anvin
2012-10-17 16:54       ` Konrad Rzeszutek Wilk
2012-10-17 17:35         ` H. Peter Anvin
2012-10-18 15:22           ` [Xen-devel] " Dan Magenheimer
2012-10-18 15:28             ` H. Peter Anvin
2012-10-18 15:56               ` Dan Magenheimer
2012-10-18 16:17                 ` Borislav Petkov
2012-10-18 16:44                   ` Stefano Stabellini [this message]
2012-10-18 17:04                     ` H. Peter Anvin
2012-10-18 16:37                 ` H. Peter Anvin
2012-10-19 15:48                   ` Is: Xen architecture document. Was: " Konrad Rzeszutek Wilk
2012-10-19 17:45                     ` H. Peter Anvin
2012-10-18 16:31         ` David Vrabel
2012-10-18 16:31           ` David Vrabel
2012-10-18 17:42           ` Konrad Rzeszutek Wilk
2012-10-18 18:02             ` David Vrabel
2012-10-17 17:46 ` Ben Guthro
2012-10-17 17:43   ` Konrad Rzeszutek Wilk
2012-10-17 18:00     ` Ben Guthro
2012-10-19 18:49       ` Konrad Rzeszutek Wilk
2012-10-20  1:23         ` Ben Guthro

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