Changes since v3:
- Use memcmp() [Sean].
- Update the comment in kvm_set_cpuid() making (hopefully) it more clear
that the introduced check does not cover all potentially problemmatic
scenarios [Sean].
- Add "KVM: x86: Move CPUID.(EAX=0x12,ECX=1) mangling to
__kvm_update_cpuid_runtime()" patch.
Original description:
Recently, KVM made it illegal to change CPUID after KVM_RUN but
unfortunately this change is not fully compatible with existing VMMs.
In particular, QEMU reuses vCPU fds for CPU hotplug after unplug and it
calls KVM_SET_CPUID2. Relax the requirement by implementing an allowing
KVM_SET_CPUID{,2} with the exact same data.
Vitaly Kuznetsov (5):
KVM: x86: Do runtime CPUID update before updating
vcpu->arch.cpuid_entries
KVM: x86: Move CPUID.(EAX=0x12,ECX=1) mangling to
__kvm_update_cpuid_runtime()
KVM: x86: Partially allow KVM_SET_CPUID{,2} after KVM_RUN
KVM: selftests: Rename 'get_cpuid_test' to 'cpuid_test'
KVM: selftests: Test KVM_SET_CPUID2 after KVM_RUN
arch/x86/kvm/cpuid.c | 119 +++++++++++++-----
arch/x86/kvm/x86.c | 19 ---
tools/testing/selftests/kvm/.gitignore | 2 +-
tools/testing/selftests/kvm/Makefile | 4 +-
.../selftests/kvm/include/x86_64/processor.h | 7 ++
.../selftests/kvm/lib/x86_64/processor.c | 33 ++++-
.../x86_64/{get_cpuid_test.c => cpuid_test.c} | 30 +++++
7 files changed, 157 insertions(+), 57 deletions(-)
rename tools/testing/selftests/kvm/x86_64/{get_cpuid_test.c => cpuid_test.c} (83%)
--
2.34.1
