linux-kernel - Flushing user entries for kernel mappings in x86

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Message-Id: <8F811430-A9D5-446C-9D6A-C4CA82555559@gmail.com>
Date:   Tue, 28 Aug 2018 18:46:52 -0700
From:   Nadav Amit <nadav.amit@...il.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Flushing user entries for kernel mappings in x86

Hello Andy,

Is there a reason for __flush_tlb_one_kernel() to flush the PTE not only in
the kernel address space, but also in the user one (as part of
__flush_tlb_one_user)? [ I obviously regard the case when PTI is on ].

Thanks,
Nadav