| Date | Tue, 22 Apr 2014 11:51:27 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86-64: espfix for 64-bit mode *PROTOTYPE* |
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On 04/22/2014 11:17 AM, Brian Gerst wrote: >> >> That is the entry condition that we have to deal with. The fact that >> the switch to the IST is unconditional is what makes ISTs hard to deal with. > > Right, that is why you switch away from the IST as soon as possible, > copying the data that is already pushed there to another stack so it > won't be overwritten by a recursive fault. >
That simply will not work if you can take a #GP due to the "safe" MSR functions from NMI and #MC context, which would be my main concern.
-hpa
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