From: Borislav Petkov <bp@alien8.de>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
"Luis R. Rodriguez" <mcgrof@suse.com>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
cocci@systeme.lip6.fr, Juergen Gross <jgross@suse.com>,
mcb30@ipxe.org, Thomas Gleixner <tglx@linutronix.de>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Joerg Roedel <joro@8bytes.org>,
Robert Moore <robert.moore@intel.com>,
Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Xen Devel <xen-devel@lists.xensource.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Jan Beulich <JBeulich@suse.com>, Lv Zheng <lv.zheng@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
long.wanglong@huawei.com, Fengguang Wu <fengguang.wu@intel.com>,
qiuxishi@huawei.com, Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
david.e.box@intel
Subject: Re: [PATCH v2 3/3] paravirt: rename paravirt_enabled to paravirt_legacy
Date: Mon, 8 Feb 2016 16:46:08 +0100 [thread overview]
Message-ID: <20160208154608.GE28980@pd.tnic> (raw)
In-Reply-To: <56B8B4D8.7050208@oracle.com>
On Mon, Feb 08, 2016 at 10:31:36AM -0500, Boris Ostrovsky wrote:
> This range is reserved for hypervisors but the only hypervisor that uses it
> is Xen PV (lguest doesn't run in 64-bit mode).
Yeah, this is mentioned in arch/x86/include/asm/page_64_types.h:
/*
* Set __PAGE_OFFSET to the most negative possible address +
* PGDIR_SIZE*16 (pgd slot 272). The gap is to allow a space for a
* hypervisor to fit. Choosing 16 slots here is arbitrary, but it's
* what Xen requires.
*/
#define __PAGE_OFFSET _AC(0xffff880000000000, UL)
It is also in Documentation/x86/x86_64/mm.txt:
ffff800000000000 - ffff87ffffffffff (=43 bits) guard hole, reserved for hypervisor
albeit a bit laconic.
Thanks.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
next prev parent reply other threads:[~2016-02-08 15:46 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
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 [this message]
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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