linux-kernel - [PATCH v2 0/5] KVM: x86: hyperv: PV IPI support for Windows guests

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Message-Id: <20180628135313.17468-1-vkuznets@redhat.com>
Date:   Thu, 28 Jun 2018 15:53:08 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org
Cc:     x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Roman Kagan <rkagan@...tuozzo.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>,
        Mohammed Gamal <mmorsy@...hat.com>,
        Cathy Avery <cavery@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/5] KVM: x86: hyperv: PV IPI support for Windows guests

Changes since v1 [Radim Krčmář]:
- Implement VP_IDX -> VCPU_IDX mapping, use it for both PV IPIs and
  TLB flush (PATCHes 1-3 added)
- Minor tweaks.

Using hypercall for sending IPIs is faster because this allows to specify
any number of vCPUs (even > 64 with sparse CPU set), the whole procedure
will take only one VMEXIT.

Same as PV TLB flush, this allows Windows guests having > 64 vCPUs to boot
on KVM when Hyper-V extensions are enabled.

Vitaly Kuznetsov (5):
  KVM: x86: hyperv: optimize 'all cpus' case in kvm_hv_flush_tlb()
  KVM: x86: hyperv: introduce vp_index_to_vcpu_idx mapping
  KVM: x86: hyperv: use vp_idx_to_vcpu_idx() in kvm_hv_flush_tlb()
  x86/hyper-v: rename ipi_arg_{ex,non_ex} structures
  KVM: x86: hyperv: implement PV IPI send hypercalls

 Documentation/virtual/kvm/api.txt  |   8 +
 arch/x86/hyperv/hv_apic.c          |  12 +-
 arch/x86/include/asm/hyperv-tlfs.h |  16 +-
 arch/x86/include/asm/kvm_host.h    |  12 ++
 arch/x86/kvm/hyperv.c              | 375 ++++++++++++++++++++++++++++++-------
 arch/x86/kvm/trace.h               |  42 +++++
 arch/x86/kvm/x86.c                 |   1 +
 include/uapi/linux/kvm.h           |   1 +
 virt/kvm/kvm_main.c                |   6 +-
 9 files changed, 391 insertions(+), 82 deletions(-)

-- 
2.14.4