linux-kernel - RE: [PATCH] intel-iommu: Add device info into list before doing context mapping

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Date:	Tue, 20 Dec 2011 18:47:22 +0800
From:	"Hao, Xudong" <xudong.hao@...el.com>
To:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"Zhang, Xiantao" <xiantao.zhang@...el.com>
Subject: RE: [PATCH] intel-iommu: Add device info into list before doing
 context mapping

Hi, David

Do you have any comments for this patch?

Thanks,
-Xudong


> -----Original Message-----
> From: Hao, Xudong
> Sent: Saturday, December 17, 2011 9:07 PM
> To: 'iommu@...ts.linux-foundation.org'; 'dwmw2@...radead.org'
> Cc: 'linux-kernel@...r.kernel.org'; 'kvm@...r.kernel.org'; Zhang, Xiantao
> Subject: [PATCH] intel-iommu: Add device info into list before doing context
> mapping
> 
> This patch add device info into list before do context mapping. Because device
> info will be used by iommu_enable_dev_iotlb function, in this function,
> pci_enable_ats would not be called without this patch, so ATS did not enable
> while a PCI device which has ATS capability is assigned to a guest.
> 
> Signed-off-by: Xudong Hao <xudong.hao@...el.com>
> Signed-off-by: Xiantao Zhang <xiantao.zhang@...el.com>
> ---
>  drivers/iommu/intel-iommu.c |   14 ++++++++------
>  1 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index
> c0c7820..f0b5d38 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -2264,12 +2264,6 @@ static int domain_add_dev_info(struct
> dmar_domain *domain,
>  	if (!info)
>  		return -ENOMEM;
> 
> -	ret = domain_context_mapping(domain, pdev, translation);
> -	if (ret) {
> -		free_devinfo_mem(info);
> -		return ret;
> -	}
> -
>  	info->segment = pci_domain_nr(pdev->bus);
>  	info->bus = pdev->bus->number;
>  	info->devfn = pdev->devfn;
> @@ -2282,6 +2276,14 @@ static int domain_add_dev_info(struct
> dmar_domain *domain,
>  	pdev->dev.archdata.iommu = info;
>  	spin_unlock_irqrestore(&device_domain_lock, flags);
> 
> +	ret = domain_context_mapping(domain, pdev, translation);
> +	if (ret) {
> +		list_del(&info->link);
> +		list_del(&info->global);
> +		free_devinfo_mem(info);
> +		return ret;
> +	}
> +
>  	return 0;
>  }
--
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