simple-pt: Mask out the PCID in the cr3 #28
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Otherwise if PCID is set, wrmsr to MSR_IA32_CR3_MATCH will fail
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I use Ubuntu 18.04 (Linux 4.15) and I found that even if I boot the kernel with nopti option, the kernel set the PCID in the cr3. As a result, writing MSR_IA32_CR3_MATCH failed. This patch masks out the PCID.
Related: #20.