Messages in this thread | | | Date | Mon, 11 May 2020 01:03:21 -0400 | From | Sasha Levin <> | Subject | Re: [PATCH v10 00/18] Enable FSGSBASE instructions |
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On Sun, May 10, 2020 at 05:50:28PM -0700, Andi Kleen wrote: >> So this is a check that checks if you're running in user mode if >> you have a debug trap with single step, but somehow it triggered >> for a user segment. >> >> Probably the regs got corrupted. >> >> Sasha, I suspect you're missing a mov %rsp,%rdi somewhere in the >> debug entry path that sets up the regs argument for the C code. > >... Ah never mind. Thomas has a better explanation.
FWIW, this series was heavily tested for the past few months to the point that we're comfortable in enabling it for 3rd party users on Azure: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1877425.
-- Thanks, Sasha
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