On 27/09/2018 05:48, Tianyu Lan wrote:
> +
> + if (range && kvm_x86_ops->tlb_remote_flush_with_range) {
> + /*
> + * Read tlbs_dirty before flushing tlbs in order
> + * to track dirty tlbs during flushing.
> + */
> + long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
> +
> + ret = kvm_x86_ops->tlb_remote_flush_with_range(kvm, range);
> + cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
This is wrong, because it's not the entire TLB that is flushed. So you
cannot do the cmpxchg here.
Paolo
> +
> + if (ret)
> + kvm_flush_remote_tlbs(kvm);
> +}
> +
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