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

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Message-ID: <2ebc33ed-ded6-0eee-96ef-84e6f61f692e@linux.intel.com>
Date:   Fri, 17 May 2019 12:46:34 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Eric Auger <eric.auger@...hat.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:     baolu.lu@...ux.intel.com, 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 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;

Best regards,
Lu Baolu