From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Borislav Petkov <bp@alien8.de>
Cc: X86 ML <x86@kernel.org>,
david.e.box@intel.com, Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Lv Zheng <lv.zheng@intel.com>, Jan Beulich <JBeulich@suse.com>,
"H. Peter Anvin" <hpa@zytor.com>,
qiuxishi@huawei.com, cocci@systeme.lip6.fr,
Xen Devel <xen-devel@lists.xensource.com>,
Joerg Roedel <joro@8bytes.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Robert Moore <robert.moore@intel.com>,
Ingo Molnar <mingo@redhat.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
"Luis R. Rodriguez" <mcgrof@suse.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Thomas Gleixner <tglx@linutronix.de>,
mcb30@ipxe.org, Juergen Gross <jgross@suse.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andy Lutomirski <luto@amacapital.net>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
long.wanglong@huawei.com, Fengguang Wu <fengguang.>
Subject: Re: [Xen-devel] [PATCH v2 3/3] paravirt: rename paravirt_enabled to paravirt_legacy
Date: Mon, 8 Feb 2016 11:31:04 -0500 [thread overview]
Message-ID: <56B8C2C8.8050406@oracle.com> (raw)
In-Reply-To: <56B8C1BC.9040603@citrix.com>
On 02/08/2016 11:26 AM, Andrew Cooper wrote:
> On 08/02/16 16:12, Boris Ostrovsky wrote:
>>
>> On 02/08/2016 11:05 AM, Andrew Cooper wrote:
>>> For compatibility with other virtualisation specs, Xen's cpuid leaves
>>> shift depending on configuration.
>>>
>>> Spec at
>>> http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=xen/include/public/arch-x86/cpuid.h;h=d709340f18d089560b959835eabb7b6609542c7e;hb=HEAD#l33
>>>
>>>
>>> Basically, they are either at 0x40000000, or 0x40000100 if viridian or
>>> vmware compatibility has been enabled.
>> (Also in arch/x86/include/asm/xen/cpuid.h in Linux tree).
> The other complication is that, for a PV guest, you must use the forced
> emulation prefix for the cpuid instruction to trap into the hypervisor.
>
> This either means you must be sure you are under Xen to start with, or
> use an extable entry to catch the #UD fault if you are not under Xen.
I think we are OK for PV because this code will be executed after pvops
are set and so we will be calling xen_cpuid().
-boris
next prev parent reply other threads:[~2016-02-08 16:31 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-06 4:30 [PATCH v2 0/3] paravirt: rebrand paravirt_enabled as paravirt_legacy Luis R. Rodriguez
2016-02-06 4:30 ` [PATCH v2 1/3] paravirt: use bool for paravirt_enabled() and paravirt_has_feature() Luis R. Rodriguez
2016-02-06 4:30 ` [PATCH v2 2/3] paravirt: replace direct access to pv_info.paravirt_enabled Luis R. Rodriguez
2016-02-06 4:30 ` [PATCH v2 3/3] paravirt: rename paravirt_enabled to paravirt_legacy Luis R. Rodriguez
2016-02-06 7:11 ` Andy Lutomirski
2016-02-06 8:59 ` Luis R. Rodriguez
2016-02-06 20:05 ` Andy Lutomirski
2016-02-06 22:04 ` Borislav Petkov
2016-02-08 15:39 ` Boris Ostrovsky
2016-02-08 15:55 ` Borislav Petkov
2016-02-08 16:05 ` [Xen-devel] " Andrew Cooper
2016-02-08 16:12 ` Boris Ostrovsky
2016-02-08 16:26 ` Andrew Cooper
2016-02-08 16:31 ` Boris Ostrovsky [this message]
2016-02-08 16:32 ` Andrew Cooper
2016-02-08 16:35 ` Borislav Petkov
2016-02-08 16:38 ` Andrew Cooper
2016-02-08 16:45 ` Borislav Petkov
2016-02-08 16:52 ` Boris Ostrovsky
2016-02-08 20:45 ` Boris Ostrovsky
2016-02-08 21:06 ` Borislav Petkov
2016-02-08 16:53 ` Andrew Cooper
2016-02-08 17:13 ` Borislav Petkov
2016-02-09 6:22 ` Luis R. Rodriguez
2016-02-08 16:41 ` Boris Ostrovsky
2016-02-08 16:52 ` Borislav Petkov
2016-02-08 15:31 ` Boris Ostrovsky
2016-02-08 15:46 ` Borislav Petkov
2016-02-09 6:59 ` Luis R. Rodriguez
2016-02-08 21:04 ` Andy Lutomirski
2016-02-09 7:06 ` Luis R. Rodriguez
2016-02-17 20:07 ` Luis R. Rodriguez
2016-02-17 20:49 ` Borislav Petkov
2016-02-17 21:12 ` Luis R. Rodriguez
2016-02-17 21:21 ` Boris Ostrovsky
2016-02-17 22:03 ` Borislav Petkov
2016-02-17 22:18 ` Andy Lutomirski
2016-02-17 22:39 ` Boris Ostrovsky
2016-02-17 23:39 ` Borislav Petkov
2016-02-17 22:19 ` Boris Ostrovsky
2016-02-17 22:35 ` Luis R. Rodriguez
2016-02-09 6:41 ` Luis R. Rodriguez
2016-02-08 21:49 ` Boris Ostrovsky
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