netdev - Re: [PATCH 7/8] iommu/intel: Support the gfp argument to the map

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Date:   Tue, 17 Jan 2023 16:35:56 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Joerg Roedel <joro@...tes.org>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Robin Murphy <robin.murphy@....com>
Cc:     baolu.lu@...ux.intel.com,
        Alex Williamson <alex.williamson@...hat.com>,
        "ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
        "ath11k@...ts.infradead.org" <ath11k@...ts.infradead.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 7/8] iommu/intel: Support the gfp argument to the
 map_pages op

On 2023/1/17 11:38, Tian, Kevin wrote:
>> From: Jason Gunthorpe<jgg@...dia.com>
>> Sent: Saturday, January 7, 2023 12:43 AM
>>
>> @@ -2368,7 +2372,7 @@ static int iommu_domain_identity_map(struct
>> dmar_domain *domain,
>>
>>   	return __domain_mapping(domain, first_vpfn,
>>   				first_vpfn, last_vpfn - first_vpfn + 1,
>> -				DMA_PTE_READ|DMA_PTE_WRITE);
>> +				DMA_PTE_READ|DMA_PTE_WRITE,
>> GFP_KERNEL);
>>   }
> Baolu, can you help confirm whether switching from GFP_ATOMIC to
> GFP_KERNEL is OK in this path? it looks fine to me in a quick glance
> but want to be conservative here.

This is also good for me. The memory notifier callback runs in a process
context and allowed to block.

Best regards,
baolu