Re: [Xen-ia64-devel] [Xen-devel] Call hypercall straightly from

To:	Tristan Gingold <tgingold@xxxxxxx>, "Xu, Anthony" <anthony.xu@xxxxxxxxx>
Subject:	Re: [Xen-ia64-devel] [Xen-devel] Call hypercall straightly from user space
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Sat, 30 Dec 2006 15:58:08 +0000
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On 30/12/06 3:22 pm, "Tristan Gingold" <tgingold@xxxxxxx> wrote:

>> As you mention before, we may call hypercall straightly from user space
>> rather than bouncing through guest kernel.
> Hi,
> 
> I haven't found the reference, but how security is addressed ?  How to prevent
> a user process from making such hypercalls ?

It would have to be enabled on a per-process basis by the guest kernel,
presumably during context switch.

 -- Keir



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Re: [Xen-ia64-devel] [Xen-devel] Call hypercall straightly from user spa