[PATCH v3 0/2] KVM: x86: Report actual nent from KVM_GET_CPUID2

From: Sean Christopherson
Date: Fri May 26 2023 - 17:03:50 EST

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.

- 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@xxxxxxxxxx
v1: https://lore.kernel.org/all/20230410141820.57328-1-itazur@xxxxxxxxxx

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

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