From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: xenpaging crashes xen in is_iomem_page()
Date: Tue, 27 Jul 2010 17:20:45 +0200
Message-ID: <20100727152045.GA20188@aepfle.de>
References: <20100726115837.GA5643@aepfle.de>
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To: Patrick Colp <pjcolp@cs.ubc.ca>
Cc: xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

On Mon, Jul 26, Patrick Colp wrote:

> I've not seen this error before. Does your computer have EPT support?

Now I got another system with X5550 cpu, i7 based.
x86info reports:
...
CPU #8
EFamily: 0 EModel: 1 Family: 6 Model: 26 Stepping: 5
CPU Model: Core i7 (Nehalem)
Processor name string: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz

And it still crashes this way.

XEN reports this during boot:

...
(XEN) VMX: Supported advanced features:
(XEN)  - APIC MMIO access virtualisation
(XEN)  - APIC TPR shadow
(XEN)  - Extended Page Tables (EPT)
(XEN)  - Virtual-Processor Identifiers (VPID)
(XEN)  - Virtual NMI
(XEN)  - MSR direct-access bitmap
(XEN) EPT supports 2MB super page.
(XEN) HVM: ASIDs enabled.
(XEN) HVM: VMX enabled
(XEN) HVM: Hardware Assisted Paging detected.
(XEN) Brought up 8 CPUs
...


So, is xenpaging really working for you?


Olaf