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From: Alex Williamson <alex.williamson@redhat.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	Linuxarm <linuxarm@huawei.com>,
	John Garry <john.garry@huawei.com>,
	"xuwei (O)" <xuwei5@huawei.com>,
	Robin Murphy <robin.murphy@arm.com>,
	"eric.auger@redhat.com" <eric.auger@redhat.com>,
	"pmorel@linux.vnet.ibm.com" <pmorel@linux.vnet.ibm.com>
Subject: Re: [PATCH v6 4/7] iommu/dma: Move PCI window region reservation back into dma specific path.
Date: Mon, 30 Apr 2018 10:10:50 -0600	[thread overview]
Message-ID: <20180430101050.671cb772@w520.home> (raw)
In-Reply-To: <5FC3163CFD30C246ABAA99954A238FA8386928A8@FRAEML521-MBX.china.huawei.com>

On Tue, 24 Apr 2018 13:16:19 +0000
Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com> wrote:

> Hi Joerg,
> 
> Could you please take a look at this patch and let me know.
> 
> I have rebased this to 4.17-rc1  and added Robin's R-by.
> 
> This series[1] is now pending on this patch as without this it will break few
> ARM platforms[2]. 
> 
> Please take a look and let me know.

Hi Joerg,

Any thoughts on this patch?  Shameer is blocked on this series without
your ack.  We could consider moving this to a separate IOMMU patch, but
then I think we'd need to order our v4.18 pull requests, so there's a
bit of a preference to keep it within this series.  Thanks,

Alex

> [1] https://lkml.org/lkml/2018/4/18/293
> [2] https://lkml.org/lkml/2018/3/14/881
> 
> 
> > -----Original Message-----
> > From: Shameerali Kolothum Thodi
> > Sent: Wednesday, April 18, 2018 12:41 PM
> > To: alex.williamson@redhat.com; eric.auger@redhat.com;
> > pmorel@linux.vnet.ibm.com
> > Cc: kvm@vger.kernel.org; linux-kernel@vger.kernel.org; iommu@lists.linux-
> > foundation.org; Linuxarm <linuxarm@huawei.com>; John Garry
> > <john.garry@huawei.com>; xuwei (O) <xuwei5@huawei.com>; Shameerali
> > Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>; Joerg Roedel
> > <joro@8bytes.org>
> > Subject: [PATCH v6 4/7] iommu/dma: Move PCI window region reservation
> > back into dma specific path.
> > 
> > This pretty much reverts commit 273df9635385 ("iommu/dma: Make PCI
> > window reservation generic")  by moving the PCI window region
> > reservation back into the dma specific path so that these regions
> > doesn't get exposed via the IOMMU API interface. With this change,
> > the vfio interface will report only iommu specific reserved regions
> > to the user space.
> > 
> > Cc: Joerg Roedel <joro@8bytes.org>
> > Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> > Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> > ---
> >  drivers/iommu/dma-iommu.c | 54 ++++++++++++++++++++++----------------------
> > ---
> >  1 file changed, 25 insertions(+), 29 deletions(-)
> > 
> > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> > index f05f3cf..ddcbbdb 100644
> > --- a/drivers/iommu/dma-iommu.c
> > +++ b/drivers/iommu/dma-iommu.c
> > @@ -167,40 +167,16 @@ EXPORT_SYMBOL(iommu_put_dma_cookie);
> >   * @list: Reserved region list from iommu_get_resv_regions()
> >   *
> >   * IOMMU drivers can use this to implement their .get_resv_regions callback
> > - * for general non-IOMMU-specific reservations. Currently, this covers host
> > - * bridge windows for PCI devices and GICv3 ITS region reservation on ACPI
> > - * based ARM platforms that may require HW MSI reservation.
> > + * for general non-IOMMU-specific reservations. Currently, this covers GICv3
> > + * ITS region reservation on ACPI based ARM platforms that may require HW
> > MSI
> > + * reservation.
> >   */
> >  void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
> >  {
> > -	struct pci_host_bridge *bridge;
> > -	struct resource_entry *window;
> > -
> > -	if (!is_of_node(dev->iommu_fwspec->iommu_fwnode) &&
> > -		iort_iommu_msi_get_resv_regions(dev, list) < 0)
> > -		return;
> > -
> > -	if (!dev_is_pci(dev))
> > -		return;
> > -
> > -	bridge = pci_find_host_bridge(to_pci_dev(dev)->bus);
> > -	resource_list_for_each_entry(window, &bridge->windows) {
> > -		struct iommu_resv_region *region;
> > -		phys_addr_t start;
> > -		size_t length;
> > -
> > -		if (resource_type(window->res) != IORESOURCE_MEM)
> > -			continue;
> > 
> > -		start = window->res->start - window->offset;
> > -		length = window->res->end - window->res->start + 1;
> > -		region = iommu_alloc_resv_region(start, length, 0,
> > -				IOMMU_RESV_RESERVED);
> > -		if (!region)
> > -			return;
> > +	if (!is_of_node(dev->iommu_fwspec->iommu_fwnode))
> > +		iort_iommu_msi_get_resv_regions(dev, list);
> > 
> > -		list_add_tail(&region->list, list);
> > -	}
> >  }
> >  EXPORT_SYMBOL(iommu_dma_get_resv_regions);
> > 
> > @@ -229,6 +205,23 @@ static int cookie_init_hw_msi_region(struct
> > iommu_dma_cookie *cookie,
> >  	return 0;
> >  }
> > 
> > +static void iova_reserve_pci_windows(struct pci_dev *dev,
> > +		struct iova_domain *iovad)
> > +{
> > +	struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus);
> > +	struct resource_entry *window;
> > +	unsigned long lo, hi;
> > +
> > +	resource_list_for_each_entry(window, &bridge->windows) {
> > +		if (resource_type(window->res) != IORESOURCE_MEM)
> > +			continue;
> > +
> > +		lo = iova_pfn(iovad, window->res->start - window->offset);
> > +		hi = iova_pfn(iovad, window->res->end - window->offset);
> > +		reserve_iova(iovad, lo, hi);
> > +	}
> > +}
> > +
> >  static int iova_reserve_iommu_regions(struct device *dev,
> >  		struct iommu_domain *domain)
> >  {
> > @@ -238,6 +231,9 @@ static int iova_reserve_iommu_regions(struct device
> > *dev,
> >  	LIST_HEAD(resv_regions);
> >  	int ret = 0;
> > 
> > +	if (dev_is_pci(dev))
> > +		iova_reserve_pci_windows(to_pci_dev(dev), iovad);
> > +
> >  	iommu_get_resv_regions(dev, &resv_regions);
> >  	list_for_each_entry(region, &resv_regions, list) {
> >  		unsigned long lo, hi;
> > --
> > 2.7.4
> >   
> 

  reply	other threads:[~2018-04-30 16:10 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-18 11:40 [PATCH v6 0/7] vfio/type1: Add support for valid iova list management Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 1/7] vfio/type1: Introduce iova list and add iommu aperture validity check Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 2/7] vfio/type1: Check reserve region conflict and update iova list Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 3/7] vfio/type1: Update iova list on detach Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 4/7] iommu/dma: Move PCI window region reservation back into dma specific path Shameer Kolothum
2018-04-24 13:16   ` Shameerali Kolothum Thodi
2018-04-30 16:10     ` Alex Williamson [this message]
2018-05-03 13:16   ` Joerg Roedel
2018-04-18 11:40 ` [PATCH v6 5/7] vfio/type1: check dma map request is within a valid iova range Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 6/7] vfio/type1: Add IOVA range capability support Shameer Kolothum
2018-04-18 11:40 ` [PATCH v6 7/7] vfio/type1: remove duplicate retrieval of reserved regions Shameer Kolothum
2018-05-24 18:20 ` [PATCH v6 0/7] vfio/type1: Add support for valid iova list management Alex Williamson
2018-05-25  8:45   ` Shameerali Kolothum Thodi
2018-05-25 20:54     ` Alex Williamson
2018-06-05 17:03       ` Alex Williamson
2018-06-06  6:52         ` Shameerali Kolothum Thodi
2018-06-07 15:05           ` Alex Williamson

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