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Date:   Sun, 5 May 2019 09:19:51 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Tom Murphy <tmurphy@...sta.com>, iommu@...ts.linux-foundation.org
Cc:     baolu.lu@...ux.intel.com, Heiko Stuebner <heiko@...ech.de>,
        kvm@...r.kernel.org, Will Deacon <will.deacon@....com>,
        David Brown <david.brown@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-s390@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-rockchip@...ts.infradead.org, Kukjin Kim <kgene@...nel.org>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Andy Gross <andy.gross@...aro.org>,
        linux-tegra@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
        linux-arm-msm@...r.kernel.org,
        Alex Williamson <alex.williamson@...hat.com>,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Robin Murphy <robin.murphy@....com>,
        linux-kernel@...r.kernel.org, murphyt7@....ie,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [RFC 2/7] iommu/vt-d: Remove iova handling code from non-dma ops
 path

Hi,

On 5/4/19 9:23 PM, Tom Murphy via iommu wrote:
> @@ -4181,58 +4168,37 @@ static int intel_iommu_memory_notifier(struct notifier_block *nb,
>   				       unsigned long val, void *v)
>   {
>   	struct memory_notify *mhp = v;
> -	unsigned long long start, end;
> -	unsigned long start_vpfn, last_vpfn;
> +	unsigned long start_vpfn = mm_to_dma_pfn(mhp->start_pfn);
> +	unsigned long last_vpfn = mm_to_dma_pfn(mhp->start_pfn +
> +			mhp->nr_pages - 1);
>   
>   	switch (val) {
>   	case MEM_GOING_ONLINE:
> -		start = mhp->start_pfn << PAGE_SHIFT;
> -		end = ((mhp->start_pfn + mhp->nr_pages) << PAGE_SHIFT) - 1;
> -		if (iommu_domain_identity_map(si_domain, start, end)) {
> -			pr_warn("Failed to build identity map for [%llx-%llx]\n",
> -				start, end);
> +		if (iommu_domain_identity_map(si_domain, start_vpfn,
> +					last_vpfn)) {
> +			pr_warn("Failed to build identity map for [%lx-%lx]\n",
> +				start_vpfn, last_vpfn);
>   			return NOTIFY_BAD;
>   		}
>   		break;

Actually we don't need to update the si_domain if iommu hardware
supports pass-through mode. This should be made in a separated patch
anyway.

Best regards,
Lu Baolu

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