linux-kernel - [PATCH v4 0/7] x86/kvm/hyperv: stable clocksource for L2 guests when running nested KVM on Hyper-V

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Message-Id: <20180124132337.30138-1-vkuznets@redhat.com>
Date:   Wed, 24 Jan 2018 14:23:30 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, x86@...nel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        Andy Lutomirski <luto@...nel.org>,
        Mohammed Gamal <mmorsy@...hat.com>,
        Cathy Avery <cavery@...hat.com>,
        Roman Kagan <rkagan@...tuozzo.com>,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org
Subject: [PATCH v4 0/7] x86/kvm/hyperv: stable clocksource for L2 guests when running nested KVM on Hyper-V

Changes since v3:
- PATCH3:
  - drop 'include <linux/interrupt.h>' (and __visible/_irq_entry from
    hyperv_reenlightenment_intr declaration -- but not from implementation)
    from mshyperv.h [kbuild robot] I'm retaining Thomas' Reviewed-by tag as
    the change is small, hope that's OK.
- PATCH7:
  - add static to kvm_hyperv_tsc_notifier() [kbuild robot]. I'm also
    keeping Paolo's Acked-by as the change is trivial.

So currently only PATCH2 of the series doesn't have a Reviewed-by/
Acked-by tag.

Original description:

Currently, KVM passes PVCLOCK_TSC_STABLE_BIT to its guests when running in
so called 'masterclock' mode and this is only possible when the clocksource
on the host is TSC. When running nested on Hyper-V we're using a different
clocksource in L1 (Hyper-V TSC Page) which can actually be used for
masterclock. This series brings the required support.

Making KVM work with TSC page clocksource is relatively easy, it is done in
PATCH 6 of the series. All the rest is required to support L1 migration
when TSC frequency changes, we use a special feature from Hyper-V to do
the job.

Vitaly Kuznetsov (7):
  x86/hyper-v: check for required priviliges in hyperv_init()
  x86/hyper-v: add a function to read both TSC and TSC page value
    simulateneously
  x86/hyper-v: reenlightenment notifications support
  x86/hyper-v: redirect reenlightment notifications on CPU offlining
  x86/irq: Count Hyper-V reenlightenment interrupts
  x86/kvm: pass stable clocksource to guests when running nested on
    Hyper-V
  x86/kvm: support Hyper-V reenlightenment

 arch/x86/entry/entry_32.S          |   3 +
 arch/x86/entry/entry_64.S          |   3 +
 arch/x86/hyperv/hv_init.c          | 123 ++++++++++++++++++++++++++++++++-
 arch/x86/include/asm/hardirq.h     |   3 +
 arch/x86/include/asm/irq_vectors.h |   7 +-
 arch/x86/include/asm/mshyperv.h    |  32 +++++++--
 arch/x86/include/uapi/asm/hyperv.h |  27 ++++++++
 arch/x86/kernel/cpu/mshyperv.c     |   6 ++
 arch/x86/kernel/irq.c              |   9 +++
 arch/x86/kvm/x86.c                 | 138 ++++++++++++++++++++++++++++++-------
 10 files changed, 319 insertions(+), 32 deletions(-)

-- 
2.14.3