On 15/08/18 15:21, Andrew Cooper wrote:
> On 15/08/18 14:17, Andrew Cooper wrote:
>> Hello,
> 
> Apologies.  Getting Dario's correct email address this time.
> 
>>
>> Now that the embargo on XSA-273 is up, we can start publicly discussing
>> the remaining work do, because there is plenty to do.  In no particular
>> order...
>>
>> 1) Attempting to shadow dom0 from boot leads to some assertions very
>> very quickly.   Shadowing dom0 after-the-fact leads to some very weird
>> crashes where whole swathes of the shadow appears to be missing.  This
>> is why, for now, automatic shadowing of dom0 is disabled by default.
>>
>> 2) 32bit PV guests which use writeable pagetable support will
>> automatically get shadowed when the clear the lower half.  Ideally, such
>> guests should be modified to use hypercalls rather than the ptwr
>> infrastructure (as its more efficient to begin with), but we can
>> probably work around this in Xen by emulating the next few instructions
>> until we have a complete PTE (same as the shadow code).

I can work on that in the Linux kernel.

There has been another bug which I suspect is related to that:

https://bugzilla.kernel.org/show_bug.cgi?id=198497


Juergen

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