linux-kernel - [PATCH v3 0/4] KVM: cpuid: fix KVM_GET_EMULATED

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Message-Id: <20210406082642.20115-1-eesposit@redhat.com>
Date:   Tue,  6 Apr 2021 10:26:38 +0200
From:   Emanuele Giuseppe Esposito <eesposit@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Shuah Khan <shuah@...nel.org>,
        Alexander Graf <graf@...zon.com>,
        Andrew Jones <drjones@...hat.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v3 0/4] KVM: cpuid: fix KVM_GET_EMULATED_CPUID implementation

This series aims to clarify the behavior of the KVM_GET_EMULATED_CPUID
ioctl, and fix a corner case where -E2BIG is returned when
the nent field of struct kvm_cpuid2 is matching the amount of
emulated entries that kvm returns.

Patch 1 proposes the nent field fix to cpuid.c,
patch 2 updates the ioctl documentation accordingly and
patches 3 and 4 extend the x86_64/get_cpuid_test.c selftest to check
the intended behavior of KVM_GET_EMULATED_CPUID.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@...hat.com>
---
v3:
- clearer commit message and problem explanation 
- pre-initialize the stack variable 'entry' in __do_cpuid_func_emulated
so that the various eax/ebx/ecx are initialized if not set by func.


Emanuele Giuseppe Esposito (4):
  KVM: x86: Fix a spurious -E2BIG in KVM_GET_EMULATED_CPUID
  Documentation: KVM: update KVM_GET_EMULATED_CPUID ioctl description
  selftests: add kvm_get_emulated_cpuid to processor.h
  selftests: KVM: extend get_cpuid_test to include
    KVM_GET_EMULATED_CPUID

 Documentation/virt/kvm/api.rst                | 10 +--
 arch/x86/kvm/cpuid.c                          | 33 ++++---
 .../selftests/kvm/include/x86_64/processor.h  |  1 +
 .../selftests/kvm/lib/x86_64/processor.c      | 33 +++++++
 .../selftests/kvm/x86_64/get_cpuid_test.c     | 90 ++++++++++++++++++-
 5 files changed, 142 insertions(+), 25 deletions(-)

-- 
2.30.2