Messages in this thread | | | Date | Tue, 18 Jul 2006 13:46:25 -0700 (PDT) | Subject | Re: [RFC PATCH 18/33] Subarch support for CPUID instruction | From | David Miller <> |
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From: Zachary Amsden <zach@vmware.com> Date: Tue, 18 Jul 2006 04:33:52 -0700
> You really need a CPUID hook. The instruction is non-virtualizable, and > anything claiming to be a hypervisor really has to support masking and > flattening the cpuid namespace for the instruction itself. It is used > in assembler code and very early in boot. The alternative is injecting > a bunch of Xen-specific code to filter feature bits into the i386 layer, > which is both bad for Linux and bad for Xen - and was quite ugly in the > last set of Xen patches.
Userspace will still see the full set of cpuid bits, since it can still execute cpuid unimpeded, is this ok? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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