linux-kernel - [PATCH v3 0/8] KVM: x86: Hyper-V hypercall fix and cleanups

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Message-Id: <20211207220926.718794-1-seanjc@google.com>
Date:   Tue,  7 Dec 2021 22:09:18 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ajay Garg <ajaygargnsit@...il.com>
Subject: [PATCH v3 0/8] KVM: x86: Hyper-V hypercall fix and cleanups

Fix a bug where KVM incorrectly skips an "all_cpus" IPI request, and misc
cleanups and enhancements for KVM handling of Hyper-V hypercalls.

Based on kvm/queue, commit 1cf84614b04a ("KVM: x86: Exit to ...").

v3:
  - Collect reviews. [Vitaly]
  - Add BUILD_BUG_ON() to protect KVM_HV_MAX_SPARSE_VCPU_SET_BITS. [Vitaly]
  - Fix misc typos. [Vitaly]
  - Opportunistically rename "cnt" to "rep_cnt" in tracepoint. [Vitaly]
  - Drop var_cnt checks for debug hypercalls due to lack of documentation
    as to their expected behavior. [Vitaly]
  - Tweak the changelog regarding the TLFS spec issue to reference the
    bug filed by Vitaly.

v2: https://lore.kernel.org/all/20211030000800.3065132-1-seanjc@google.com/

Sean Christopherson (8):
  KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI
    req
  KVM: x86: Get the number of Hyper-V sparse banks from the VARHEAD
    field
  KVM: x86: Refactor kvm_hv_flush_tlb() to reduce indentation
  KVM: x86: Add a helper to get the sparse VP_SET for IPIs and TLB
    flushes
  KVM: x86: Don't bother reading sparse banks that end up being ignored
  KVM: x86: Shove vp_bitmap handling down into sparse_set_to_vcpu_mask()
  KVM: x86: Reject fixeds-size Hyper-V hypercalls with non-zero
    "var_cnt"
  KVM: x86: Add checks for reserved-to-zero Hyper-V hypercall fields

 arch/x86/kvm/hyperv.c             | 175 ++++++++++++++++++------------
 arch/x86/kvm/trace.h              |  14 ++-
 include/asm-generic/hyperv-tlfs.h |   7 ++
 3 files changed, 123 insertions(+), 73 deletions(-)

-- 
2.34.1.400.ga245620fadb-goog