Messages in this thread | | | Date | Mon, 18 May 2015 21:34:32 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH 01/19] x86, mpx, xsave: fix up bad get_xsave_addr() assumptions |
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On Fri, 8 May 2015, Dave Hansen wrote: > From: Dave Hansen <dave.hansen@linux.intel.com> > > get_xsave_addr() assumes that if an xsave bit is present in the > hardware (pcntxt_mask) that it is present in a given xsave > buffer. Due to an bug in the xsave code on all of the systems > that have MPX (and thus all the users of this code), that has > been a true assumption. > > But, the bug is getting fixed, so our assumption is not going > to hold any more. > > It's quite possible (and normal) for an enabled state to be > present on 'pcntxt_mask', but *not* in 'xstate_bv'. We need > to consult 'xstate_bv'. > > Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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