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Re: [Xen-ia64-devel] [PATCH]: vcpu_match_tr_entry & vcpu_ptc_ga

from [Tristan Gingold]

[Permanent Link][Original]

To:	Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Subject:	Re: [Xen-ia64-devel] [PATCH]: vcpu_match_tr_entry & vcpu_ptc_ga
From:	Tristan Gingold <Tristan.Gingold@xxxxxxxx>
Date:	Fri, 31 Mar 2006 13:50:47 +0100
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Le Vendredi 31 Mars 2006 14:10, Isaku Yamahata a écrit :
> Hi Tristan.
>
> In fact traversing p2m tables (domain->arch.mm) is also racy.
> There are readers and writers of p2m tables so that
> access of p2m tables also must be protected somehow.
> I haven't dug into this SMP issue so I'm not sure that
> a smart way other than locking is possible.
Ah, I understand better...

> Just a thought.
> According to SDM only single ptc.ga must be issued at a time
> otherwise the result is undefined. Is it exploited?
Yes, there is a spinlock around ptc.ga.
I don't see your conclusion: how to exploit that ?

Tristan.


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