linux-kernel - Re: [PATCH v6 08/18] iommu/vt-d: Implement reserved region get/put callbacks

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Message-ID: <36bac0a9-89a6-ff7b-1870-a795a4f57700@redhat.com>
Date:   Fri, 6 Jan 2017 12:45:54 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     eric.auger.pro@...il.com, christoffer.dall@...aro.org,
        marc.zyngier@....com, robin.murphy@....com,
        alex.williamson@...hat.com, will.deacon@....com,
        tglx@...utronix.de, jason@...edaemon.net,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        drjones@...hat.com, linux-kernel@...r.kernel.org,
        pranav.sawargaonkar@...il.com, iommu@...ts.linux-foundation.org,
        punit.agrawal@....com, diana.craciun@....com, gpkulkarni@...il.com,
        shankerd@...eaurora.org, bharat.bhushan@....com,
        geethasowjanya.akula@...il.com
Subject: Re: [PATCH v6 08/18] iommu/vt-d: Implement reserved region get/put
 callbacks

Hi Joerg,

On 06/01/2017 12:01, Joerg Roedel wrote:
> On Thu, Jan 05, 2017 at 07:04:36PM +0000, Eric Auger wrote:
>> +static void intel_iommu_get_resv_regions(struct device *device,
>> +					 struct list_head *head)
>> +{
>> +	struct iommu_resv_region *reg;
>> +
>> +	reg = iommu_alloc_resv_region(IOAPIC_RANGE_START,
>> +				      IOAPIC_RANGE_END - IOAPIC_RANGE_START + 1,
>> +				      0, IOMMU_RESV_NOMAP);
>> +	if (!reg)
>> +		return;
>> +	list_add_tail(&reg->list, head);
>> +}
> 
> That is different from what AMD does, can you also report the RMRR
> regions for the device here (as direct-map regions)?

if I return RMRR regions as direct mapped regions,
iommu_group_create_direct_mappings will perform the 1-1 mapping.

I am not familiar with the intel-iommu code but I guess this job
currently is done in the intel driver:
iommu_prepare_rmrr_dev -> iommu_prepare_identity_map
->domain_prepare_identity_map -> iommu_domain_identity_map?

What is your feeling?

Thanks

Eric
> 
> 
> 
> 	Joerg
>