linux-kernel - Re: [PATCH v8 7/9] vfio/mdev: Add iommu related member in mdev

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Message-ID: <20210407113436.GD7405@nvidia.com>
Date:   Wed, 7 Apr 2021 08:34:36 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Christoph Hellwig <hch@....de>, Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>, ashok.raj@...el.com,
        sanjay.k.kumar@...el.com, jacob.jun.pan@...el.com,
        kevin.tian@...el.com,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        yi.l.liu@...el.com, yi.y.sun@...el.com, peterx@...hat.com,
        tiwei.bie@...el.com, xin.zeng@...el.com,
        iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v8 7/9] vfio/mdev: Add iommu related member in mdev_device

On Wed, Apr 07, 2021 at 09:58:05AM +0800, Lu Baolu wrote:

> I've ever tried to implement a bus iommu_ops for mdev devices.
> 
> https://lore.kernel.org/lkml/20201030045809.957927-1-baolu.lu@linux.intel.com/
> 
> Any comments?

You still have the symbol_get, so something continues to be wrong with
that series:

+	mdev_bus = symbol_get(mdev_bus_type);
+	if (mdev_bus) {
+		if (bus == mdev_bus && !iommu_present(bus)) {
+			symbol_put(mdev_bus_type);

Jason