linux-kernel - [PATCH v3 0/2] KVM: x86: Report actual nent from KVM_GET

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Date:   Fri, 26 May 2023 14:03:38 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Takahiro Itazuri <itazur@...zon.com>
Subject: [PATCH v3 0/2] KVM: x86: Report actual nent from KVM_GET_CPUID2

Essentially v3 of Takahiro's patch.  Update cpuid->nent on a successful
KVM_GET_CPUID2 so that userspace knows exactly how many entries were
filled.  Add a testcase to verify KVM's ABI.

v3:
 - Don't bother updating cpuid->nent in the error path, the data is never
   copied to userspace.
 - Add testcase to cpuid_test

v2: https://lore.kernel.org/all/20230413175844.21760-1-itazur@amazon.com
v1: https://lore.kernel.org/all/20230410141820.57328-1-itazur@amazon.com

Sean Christopherson (2):
  KVM: x86: Update number of entries for KVM_GET_CPUID2 on success, not
    failure
  KVM: selftests: Extend cpuid_test to verify KVM_GET_CPUID2 "nent"
    updates

 arch/x86/kvm/cpuid.c                          | 13 ++++--------
 .../testing/selftests/kvm/x86_64/cpuid_test.c | 21 +++++++++++++++++++
 2 files changed, 25 insertions(+), 9 deletions(-)


base-commit: b9846a698c9aff4eb2214a06ac83638ad098f33f
-- 
2.41.0.rc0.172.g3f132b7071-goog