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Commit 2a9baf5a authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Thomas Gleixner
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x86/debug: Fix BTF handling



The SDM states that #DB clears DEBUGCTLMSR_BTF, this means that when the
bit is set for userspace (TIF_BLOCKSTEP) and a kernel #DB happens first,
the BTF bit meant for userspace execution is lost.

Have the kernel #DB handler restore the BTF bit when it was requested
for userspace.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarKyle Huey <me@kylehuey.com>
Link: https://lore.kernel.org/r/20201027093607.956147736@infradead.org
parent ed8780e3
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