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Re: [Xen-devel] [RFC 3/4] HVM x86 deprivileged mode: Code for switching into/out of deprivileged mode

>>> On 18.08.15 at 12:26, <Ben.Catterall@xxxxxxxxxx> wrote:
> On 18/08/15 11:25, Ben Catterall wrote:
>> On 17/08/15 16:17, Jan Beulich wrote:
>>>>>> On 17.08.15 at 17:07, <tim@xxxxxxx> wrote:
>>>> At 14:53 +0100 on 17 Aug (1439823232), Ben Catterall wrote:
>>>>> So, have we arrived at a decision for this? Thanks!
>>>> Seems to have stalled a bit.  OK, I propose that:
>>>>   - we use TR/IST to make Xen take interrupts/exceptions at a
>>>> different SP;
>>>>   - we make that SP be an extension of the main stack, so that things
>>>>     like current() Just Work[tm];
>>  From Xen's cpu stack layout, page 4 is currently unused so I'll put it
>> here. Is this an acceptable?
> Or, would it be better to put it at position 5, and move the optional 
> MEMORY_GUARD page down to position 4?

At this stage either would do. Once (if) the experiment yielded
positive results, we can still evaluate the pros and cons of either


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