Hi Paolo,
On Thu, Jul 09, 2020 at 01:28:01PM -0400, Paolo Bonzini wrote:
> Commit 850448f35aaf ("KVM: nVMX: Fix VMX preemption timer migration",
> 2020-06-01) accidentally broke nVMX live migration from older version
> by changing the userspace ABI. Restore it and, while at it, ensure
> that vmx->nested.has_preemption_timer_deadline is always initialized
> according to the KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE flag.
>
> Cc: Makarand Sonare <makarandsonare@xxxxxxxxxx>
> Fixes: 850448f35aaf ("KVM: nVMX: Fix VMX preemption timer migration")
> Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ---
> v1->v2: coding style [Jim]
>
> arch/x86/include/uapi/asm/kvm.h | 5 +++--
> arch/x86/kvm/vmx/nested.c | 1 +
> 2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
> index 17c5a038f42d..0780f97c1850 100644
> --- a/arch/x86/include/uapi/asm/kvm.h
> +++ b/arch/x86/include/uapi/asm/kvm.h
> @@ -408,14 +408,15 @@ struct kvm_vmx_nested_state_data {
> };
>
> struct kvm_vmx_nested_state_hdr {
> - __u32 flags;
> __u64 vmxon_pa;
> __u64 vmcs12_pa;
> - __u64 preemption_timer_deadline;
>
> struct {
> __u16 flags;
> } smm;
> +
> + __u32 flags;
> + __u64 preemption_timer_deadline;
> };
>
Should we update also Documentation/virt/kvm/api.rst to be consistent?
Thanks,
Stefano
