Re: [PATCH v4 02/11] KVM: x86/hyperv: Check for NULL vCPU Hyper-V object in kvm_hv_get_tlb_flush_fifo()

[Philippe Mathieu-Daudé]

On 1/7/26 00:56, Sean Christopherson wrote:
> Check for a NULL Hyper-V object in kvm_hv_get_tlb_flush_fifo() instead of
> relying on the caller to do so.  This will allow fixing a cross-vCPU race
> where KVM can access a vCPU's FIFO before it's fully initialized, without
> having to jump through too many cognitive hoops to reason about the
> correctness of the logic.
>
> Ignoring changes in ordering that only affect the aforementioned race, no
> functional change intended.
>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> ---
>   arch/x86/kvm/hyperv.c | 11 +++++------
>   arch/x86/kvm/hyperv.h |  7 ++++++-
>   2 files changed, 11 insertions(+), 7 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxxxxxxxx>