From: BVK Chaitanya <bayapuneni_chaitanya@symantec.com>
To: Xen-devel@lists.xensource.com
Subject: On x86_64 Xen Implementation
Date: Mon, 21 Jul 2008 16:20:22 +0530 [thread overview]
Message-ID: <488469EE.4090700@symantec.com> (raw)
Hi,
Xen 3.0 inteface manual says:
On 64-bit systems it is not possible to protect the hypervisor from
untrusted guest code running in rings 1 and 2. Guests are therefore
restricted to run in ring 3 only. The guest kernel is protected from its
applications by context switching between the kernel and currently
running application.
Can anybody explain (or provide me pointers) to what x86_64 features
make protecting hypervisor from untrusted guest (kernels) impossible?
Is x86_64 (by-design) makes x86's 4 rings feature obsolete?
thanks,
--
bvk-chaitanya
next reply other threads:[~2008-07-21 10:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-21 10:50 BVK Chaitanya [this message]
2008-07-21 11:17 ` On x86_64 Xen Implementation Andre Przywara
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