linux-kernel - [PATCH v2 0/8] KVM: x86: Hyper-V hypercall fix and cleanups

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Date:   Fri, 29 Oct 2021 17:07:52 -0700
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 v2 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.

Note, I couldn't find any documentation on the DEBUG hypercalls, I'm
basically just guessing that they don't have a variable sized header
and thus should reject hypercalls with a non-zero VARHEAD field.

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             | 172 ++++++++++++++++++------------
 arch/x86/kvm/trace.h              |  14 +--
 include/asm-generic/hyperv-tlfs.h |   7 ++
 3 files changed, 120 insertions(+), 73 deletions(-)

-- 
2.33.1.1089.g2158813163f-goog