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Date:   Wed, 16 Jun 2021 16:44:13 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Zhangfei Gao <zhangfei.gao@linaro.org>
Cc:     Christoph Hellwig <hch@lst.de>, Joerg Roedel <joro@8bytes.org>,
        Will Deacon <will@kernel.org>,
        Auger Eric <eric.auger@redhat.com>,
        jean-philippe <jean-philippe@linaro.org>,
        iommu@lists.linux-foundation.org, kvm@vger.kernel.org
Subject: Re: [RFC PATCH] iommu: add domain->nested
Message-ID: <20210616144413.GA2593@lst.de>
References: <1623854282-26121-1-git-send-email-zhangfei.gao@linaro.org>
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On Wed, Jun 16, 2021 at 10:38:02PM +0800, Zhangfei Gao wrote:
> +++ b/include/linux/iommu.h
> @@ -87,6 +87,7 @@ struct iommu_domain {
>  	void *handler_token;
>  	struct iommu_domain_geometry geometry;
>  	void *iova_cookie;
> +	int nested;

This should probably be a bool : 1;

Also this needs a user, so please just queue up a variant of this for
the code that eventually relies on this information.