linux-kernel - [PATCH v2 0/7] KVM: x86: CPUID emulation and tracing fixes

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Message-Id: <20200305013437.8578-1-sean.j.christopherson@intel.com>
Date:   Wed,  4 Mar 2020 17:34:30 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.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-kernel@...r.kernel.org, Pu Wen <puwen@...on.cn>
Subject: [PATCH v2 0/7] KVM: x86: CPUID emulation and tracing fixes

Round two of trying to wrangle kvm_cpuid() into submission.  Two more bug
fixes, both related to querying for an "AMD" vendor, in addition to the
fixes in v1 (tracing and Hypervisor/Centaur range checks).

In theory, everything up to the refactoring is non-controversial, i.e. we
can bikeshed the refactoring without delaying the bug fixes.

v2:
  - Use Jan's patch to fix the trace bug. [Everyone]
  - Rework Hypervisor/Centaur handling so that only the Hypervisor
    sub-ranges get the restrictive 0xffffff00 mask, and so that Centaur's
    range only gets recognized when the guest vendor is Centaur. [Jim]
  - Add the aforementioned bug fixes.
  - Add a patch to do build time assertions on the vendor string, which
    are hand coded u32s in the emulator (for direct comparison against
    CPUID register output).
  - Drop the patch to add CPUID.maxphyaddr emulator helper. [Paolo]
  - Redo refactoring patches to land them after all the bug fixes
    and to do the refactoring without any semantic changes in the
    emulator.

Jan Kiszka (1):
  KVM: x86: Trace the original requested CPUID function in kvm_cpuid()

Sean Christopherson (6):
  KVM: x86: Add helpers to perform CPUID-based guest vendor check
  KVM x86: Extend AMD specific guest behavior to Hygon virtual CPUs
  KVM: x86: Fix CPUID range checks for Hypervisor and Centaur classes
  KVM: x86: Add build-time assertions on validity of vendor strings
  KVM: x86: Refactor out-of-range logic to contain the madness
  KVM: x86: Refactor kvm_cpuid() param that controls out-of-range logic

 arch/x86/include/asm/kvm_emulate.h |  37 +++++++++-
 arch/x86/kvm/cpuid.c               | 111 +++++++++++++++++++++--------
 arch/x86/kvm/cpuid.h               |   8 ++-
 arch/x86/kvm/emulate.c             |  64 ++++++++---------
 arch/x86/kvm/mmu/mmu.c             |   3 +-
 arch/x86/kvm/svm.c                 |   2 +-
 arch/x86/kvm/x86.c                 |   7 +-
 7 files changed, 162 insertions(+), 70 deletions(-)

-- 
2.24.1