Re: [PATCH] KVM: x86: Add a WARN on TIF_NEED_FPU_LOAD in kvm_load_guest_fpu()

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

On 09/12/19 21:05, Sean Christopherson wrote:
> +	/*
> +	 * Reloading userspace's FPU is handled by kvm_arch_vcpu_load(), both
> +	 * for direct calls from userspace (via vcpu_load()) and if this task
> +	 * is preempted (via kvm_arch_sched_in()) between vcpu_load() and now.

via kvm_sched_in (not the arch_ function).  Applied with that change.

Paolo

> +	 */
> +	WARN_ON_ONCE(test_thread_flag(TIF_NEED_FPU_LOAD));
> +