On Mon, Jan 24, 2022 at 02:17:52PM +0100, Paolo Bonzini wrote:
> On 1/24/22 14:05, Vitaly Kuznetsov wrote:
> > This is a backport of the recently merged "[PATCH v3 0/4] KVM: x86:
> > Partially allow KVM_SET_CPUID{,2} after KVM_RUN for CPU hotplug"
> > (https://lore.kernel.org/kvm/20220118141801.2219924-1-vkuznets@xxxxxxxxxx/)
> >
> > 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 (4):
> > KVM: x86: Do runtime CPUID update before updating
> > vcpu->arch.cpuid_entries
> > 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 | 90 ++++++++++++++-----
> > 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, 139 insertions(+), 46 deletions(-)
> > rename tools/testing/selftests/kvm/x86_64/{get_cpuid_test.c => cpuid_test.c} (83%)
> >
>
> Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
>
Thanks, all now queued up.
greg k-h
