linux-kernel - Re: [PATCH v7 9/9] iommu/vt-d: Add iotlb flush for nested domain

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Message-ID: <D35102EE-F1E8-4888-8A5E-A1A723B3363D@intel.com>
Date: Fri, 22 Dec 2023 07:01:40 +0000
From: "Liu, Yi L" <yi.l.liu@...el.com>
To: "Tian, Kevin" <kevin.tian@...el.com>
CC: "Yang, Weijiang" <weijiang.yang@...el.com>, "joro@...tes.org"
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Subject: Re: [PATCH v7 9/9] iommu/vt-d: Add iotlb flush for nested domain


> On Dec 22, 2023, at 14:47, Tian, Kevin <kevin.tian@...el.com> wrote:
> 
> 
>> 
>> From: Yang, Weijiang <weijiang.yang@...el.com>
>> Sent: Friday, December 22, 2023 11:56 AM
>>> +
>>> +    xa_for_each(&domain->iommu_array, i, info) {
>>> +        nested_flush_pasid_iotlb(info->iommu, domain, addr,
>> npages, 0);
>>> +
>>> +        if (domain->has_iotlb_device)
>>> +            continue;
>> 
>> Shouldn't this be if (!domain->has_iotlb_device)?
> 
> yes that is wrong.
> 
> actually it's weird to put domain check in a loop of domain->iommu_array.
> 
> that check along with devtlb flush should be done out of that loop.

Maybe adding a bool, set it out of the loop, check the bool in the loop.