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Message-ID: <56B8C7E3.5060706@oracle.com>
Date: Mon, 8 Feb 2016 11:52:51 -0500
From: Boris Ostrovsky <boris.ostrovsky@...cle.com>
To: Borislav Petkov <bp@...en8.de>,
Andrew Cooper <andrew.cooper3@...rix.com>
Cc: X86 ML <x86@...nel.org>, david.e.box@...el.com,
Andrey Ryabinin <ryabinin.a.a@...il.com>,
Lv Zheng <lv.zheng@...el.com>, Jan Beulich <JBeulich@...e.com>,
"H. Peter Anvin" <hpa@...or.com>, qiuxishi@...wei.com,
cocci@...teme.lip6.fr, Xen Devel <xen-devel@...ts.xensource.com>,
Joerg Roedel <joro@...tes.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Robert Moore <robert.moore@...el.com>,
Ingo Molnar <mingo@...hat.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Mauro Carvalho Chehab <mchehab@....samsung.com>,
"Luis R. Rodriguez" <mcgrof@...e.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Thomas Gleixner <tglx@...utronix.de>, mcb30@...e.org,
Juergen Gross <jgross@...e.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Andy Lutomirski <luto@...capital.net>,
"Luis R. Rodriguez" <mcgrof@...nel.org>, long.wanglong@...wei.com,
Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [Xen-devel] [PATCH v2 3/3] paravirt: rename paravirt_enabled to
paravirt_legacy
On 02/08/2016 11:45 AM, Borislav Petkov wrote:
> On Mon, Feb 08, 2016 at 04:38:40PM +0000, Andrew Cooper wrote:
>> Does the early loader have extable support? If so, this is fairly easy
>> to fix. If not, we have a problem.
> It doesn't and regardless, you want to have this CPUID querying as
> simple as possible. No special handling, no special prefixes as it
> should be able to run on other hypervisors too.
>
> If one can't execute a simple CPUID(0x4...) on a xen guest and get the
> results back, then for early, we will have to do what we've done until
> now and simply emulate the MSR accesses.
I think xen_hypervisor check can be done in microcode_init() as this is
first time PV kernel deals with microcode.
Let me try it --- I want to see what happens on hotplug and resume but I
am reasonably certain this should work during boot.
-boris
>
> Later code can use then xen_cpuid() and all is fine. We should still get
> rid of paravirt_enabled() though.
>
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