linux-kernel - [PATCH 0/2] x86/context-tracking: Remove last remaining calls to exception_enter/exception

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Date:   Fri, 27 Dec 2019 17:36:10 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Andy Lutomirski <luto@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH 0/2] x86/context-tracking: Remove last remaining calls to exception_enter/exception_exit()

Thanks to the cleanups from Andy Lutomirski over the years, those calls
can now be removed. This will allow for nice things in the future for
x86 support on full nohz:

* Remove TIF_NOHZ and use a per-cpu switch to enable, disable context
  tracking.

* Avoid context tracking on housekeepers.

* Dynamically enable/disable context tracking on CPU on runtime and
  therefore allow runtime enable/disable of nohz_full

* Make nohz_full a property of cpuset.

Frederic Weisbecker (2):
  x86/context-tracking: Remove exception_enter/exit() from
    do_page_fault()
  x86/context-tracking: Remove exception_enter/exit() from
    KVM_PV_REASON_PAGE_NOT_PRESENT async page fault

 arch/x86/kernel/kvm.c |  4 ----
 arch/x86/mm/fault.c   | 39 ++++++++++++---------------------------
 2 files changed, 12 insertions(+), 31 deletions(-)

-- 
2.23.0