linux-kernel - [PATCH v2 0/4] x86/mm: Fix some issues with using trampoline

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Date:   Wed, 29 Sep 2021 16:54:57 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     x86@...nel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        hpa@...or.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Joerg Roedel <jroedel@...e.de>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brijesh Singh <brijesh.singh@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/4] x86/mm: Fix some issues with using trampoline_pgd

From: Joerg Roedel <jroedel@...e.de>

Hi,

here are a couple of fixes and documentation improvements for the
kernels use of the trampoline_pgd. The first patch adds a comment to
document that the trampoline_pgd aliases kernel page-tables in the
user address range, establishing global TLB entries for these
addresses.

The next two patches add global TLB flushes when switching to and from
the trampoline_pgd. The last patch extends the trampoline_pgd to cover
the whole kernel address range. This is needed to make sure the stack
and the real_mode_header don't get unmapped when switching to the
trampoline_pgd.

Please review.

Thanks,

	Joerg

Joerg Roedel (4):
  x86/realmode: Add comment for Global bit usage in trampline_pgd
  x86/mm/64: Flush global TLB on AP bringup
  x86/mm: Flush global TLB when switching to trampoline page-table
  x86/64/mm: Map all kernel memory into trampoline_pgd

 arch/x86/include/asm/realmode.h |  1 +
 arch/x86/kernel/cpu/common.c    |  6 ++++++
 arch/x86/kernel/reboot.c        | 12 ++----------
 arch/x86/mm/init.c              |  5 +++++
 arch/x86/realmode/init.c        | 31 ++++++++++++++++++++++++++++++-
 5 files changed, 44 insertions(+), 11 deletions(-)

base-commit: 5816b3e6577eaa676ceb00a848f0fd65fe2adc29
-- 
2.33.0