Messages in this thread | | | Subject | Re: x86/fpu/xsave: protection key test failures | From | Andy Lutomirski <> | Date | Tue, 25 May 2021 17:36:18 -0700 |
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On 5/25/21 2:37 PM, Babu Moger wrote:
> Investigation so far. > 1. The test fails on AMD(Milan) systems. Test appears to pass on Intel > systems. Tested on old Intel system available here.
Ten cents says that you have discovered that AMD returns a synthesized value for XINUSE[PKRU] and that write_pkru() is buggy.
Any volunteers to fix the if (!pk) case in write_pkru() and see if the problem goes away? (Or at least to print something for the if (!pk) case and seee if it gets printed?)
--Andy
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