linux-kernel - [PATCH v6 0/7] KVM: x86: hyperv: PV IPI support for Windows guests

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Message-Id: <20180926170259.29796-1-vkuznets@redhat.com>
Date:   Wed, 26 Sep 2018 19:02:52 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org
Cc:     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 v6 0/7] KVM: x86: hyperv: PV IPI support for Windows guests

Changes since v5:
- New 'hybrid' approach to VP indexes: introduce 'num_mismatched_vp_indexes'
  and use it for optimization in both PV IPI and TLB flush [Paolo Bonzini,
  Roman Kagan].
- Rebase, KVM_CAP_HYPERV_SEND_IPI is now '160'.
- Patches 3-5 are new in this version.
- Drop "x86/hyper-v: rename ipi_arg_{ex,non_ex} structures" patch as it is
  already merged in kvm/queue.

Original description:
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 (7):
  KVM: x86: hyperv: enforce vp_index < KVM_MAX_VCPUS
  KVM: x86: hyperv: optimize 'all cpus' case in kvm_hv_flush_tlb()
  KVM: x86: hyperv: consistently use 'hv_vcpu' for 'struct kvm_vcpu_hv'
    variables
  KVM: x86: hyperv: keep track of mismatched VP indexes
  KVM: x86: hyperv: valid_bank_mask should be 'u64'
  KVM: x86: hyperv: optimize kvm_hv_flush_tlb() for vp_index == vcpu_idx
    case
  KVM: x86: hyperv: implement PV IPI send hypercalls

 Documentation/virtual/kvm/api.txt |   7 +
 arch/x86/include/asm/kvm_host.h   |   3 +
 arch/x86/kvm/hyperv.c             | 268 +++++++++++++++++++++++-------
 arch/x86/kvm/trace.h              |  42 +++++
 arch/x86/kvm/x86.c                |   1 +
 include/uapi/linux/kvm.h          |   1 +
 virt/kvm/kvm_main.c               |   6 +-
 7 files changed, 265 insertions(+), 63 deletions(-)

-- 
2.17.1