Messages in this thread | | | From | "Ren, Qiaowei" <> | Subject | RE: [PATCH v9 09/12] x86, mpx: decode MPX instruction to get bound violation information | Date | Mon, 27 Oct 2014 01:43:00 +0000 |
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On 2014-10-24, Thomas Gleixner wrote: > On Sun, 12 Oct 2014, Qiaowei Ren wrote: > >> This patch sets bound violation fields of siginfo struct in #BR >> exception handler by decoding the user instruction and constructing >> the faulting pointer. >> >> This patch does't use the generic decoder, and implements a limited >> special-purpose decoder to decode MPX instructions, simply because >> the generic decoder is very heavyweight not just in terms of >> performance but in terms of interface -- because it has to. > > My question still stands why using the existing decoder is an issue. > Performance is a complete non issue in case of a bounds violation and > the interface argument is just silly, really. >
As hpa said, we only need to decode several mpx instructions including BNDCL/BNDCU, and general decoder looks like a little heavy. Peter, what do you think about it?
Thanks, Qiaowei
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