linux-kernel - [PATCH 0/4] kvm: cpuid: fix cpuid nent field

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Message-Id: <20210331122649.38323-1-eesposit@redhat.com>
Date:   Wed, 31 Mar 2021 14:26:45 +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>,
        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 0/4] kvm: cpuid: fix cpuid nent field

This series aims to clarify the behavior of 
KVM_GET_EMULATED_CPUID and KVM_GET_SUPPORTED
ioctls, and fix a corner case where the nent field of the
struct kvm_cpuid2 is matching the amount of 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 provide a selftest to check KVM_GET_EMULATED_CPUID
accordingly.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@...hat.com>
---
v2:
- better fix in cpuid.c, perform the nent check after the switch statement 
- fix bug in get_emulated_cpuid.c selftest, each entry needs to have at least
  the padding zeroed otherwise it fails.

Emanuele Giuseppe Esposito (4):
  kvm: cpuid: adjust the returned nent field of kvm_cpuid2 for
    KVM_GET_SUPPORTED_CPUID and KVM_GET_EMULATED_CPUID
  Documentation: kvm: update KVM_GET_EMULATED_CPUID ioctl description
  selftests: add kvm_get_emulated_cpuid
  selftests: kvm: add get_emulated_cpuid test

 Documentation/virt/kvm/api.rst                |  10 +-
 arch/x86/kvm/cpuid.c                          |  35 ++--
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../selftests/kvm/include/x86_64/processor.h  |   1 +
 .../selftests/kvm/lib/x86_64/processor.c      |  33 +++
 .../selftests/kvm/x86_64/get_emulated_cpuid.c | 198 ++++++++++++++++++
 7 files changed, 256 insertions(+), 23 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86_64/get_emulated_cpuid.c

-- 
2.30.2