linux-kernel - Re: [PATCH v3 7/7] iommu/vt-d: Differentiate relaxable and non relaxable RMRRs

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Date:   Fri, 17 May 2019 09:07:30 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>, eric.auger.pro@...il.com,
        joro@...tes.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, dwmw2@...radead.org,
        lorenzo.pieralisi@....com, robin.murphy@....com,
        will.deacon@....com, hanjun.guo@...aro.org, sudeep.holla@....com
Cc:     alex.williamson@...hat.com, shameerali.kolothum.thodi@...wei.com
Subject: Re: [PATCH v3 7/7] iommu/vt-d: Differentiate relaxable and non
 relaxable RMRRs

Hi Lu,

On 5/17/19 6:46 AM, Lu Baolu wrote:
> Hi Eric,
> 
> On 5/16/19 6:08 PM, Eric Auger wrote:
>> Now we have a new IOMMU_RESV_DIRECT_RELAXABLE reserved memory
>> region type, let's report USB and GFX RMRRs as relaxable ones.
>>
>> This allows to have a finer reporting at IOMMU API level of
>> reserved memory regions. This will be exploitable by VFIO to
>> define the usable IOVA range and detect potential conflicts
>> between the guest physical address space and host reserved
>> regions.
>>
>> Signed-off-by: Eric Auger <eric.auger@...hat.com>
>> ---
>>   drivers/iommu/intel-iommu.c | 10 ++++++++--
>>   1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
>> index a36604f4900f..af1d65fdedfc 100644
>> --- a/drivers/iommu/intel-iommu.c
>> +++ b/drivers/iommu/intel-iommu.c
>> @@ -5493,7 +5493,9 @@ static void intel_iommu_get_resv_regions(struct
>> device *device,
>>       for_each_rmrr_units(rmrr) {
>>           for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
>>                         i, i_dev) {
>> +            struct pci_dev *pdev = to_pci_dev(device);
> 
> Probably should be:
> 
> struct pci_dev *pdev = dev_is_pci(device) ? to_pci_dev(device) : NULL;

That's correct. I will fix that asap.

Thanks!

Eric
> 
> Best regards,
> Lu Baolu
>