linux-kernel - [PATCH v2 0/7] x86/kvm/hyperv: stable clocksorce for L2 guests when running nested KVM on Hyper-V

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20171213150945.24054-1-vkuznets@redhat.com>
Date:   Wed, 13 Dec 2017 16:09:38 +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 v2 0/7] x86/kvm/hyperv: stable clocksorce for L2 guests when running nested KVM on Hyper-V

Changes since v1:
- PATCH5 "x86/irq: Count Hyper-V reenlightenment interrupts" added
  [Michael Kelley]
- PATCH3 "x86/hyper-v: reenlightenment notifications support" changes:
  - rename register_hv_tsc_update/unregister_hv_tsc_update() to
    set_hv_tscchange_cb()/clear_hv_tscchange_cb() to avoid the confusion
    with notification chains. [Roman Kagan]
  - pr_warn() on callback registration when reenlightenment feature is
    not available [Roman Kagan]
  - don't issue the callback when TSC accesses are not emulated
    [Roman Kagan]
  - check for TSC frequency MSRs availability [Roman Kagan]
  - allocate HYPERV_REENLIGHTENMENT_VECTOR dynamically from
    ms_hyperv_init_platform() to support future conditional output in
    /proc/interrupts

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 5 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          | 133 ++++++++++++++++++++++++++++++++++-
 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, 329 insertions(+), 32 deletions(-)

-- 
2.14.3