Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
Message-ID: <41dd3f695c57a12fc5e68a3ed818940252cdb69f.camel@linux.ibm.com>
Subject: Re: [PATCH] iommu/s390: tolerate repeat attach_dev calls
From:   Niklas Schnelle <schnelle@linux.ibm.com>
To:     Matthew Rosato <mjrosato@linux.ibm.com>, jgg@nvidia.com,
        joro@8bytes.org
Cc:     will@kernel.org, alex.williamson@redhat.com, cohuck@redhat.com,
        borntraeger@linux.ibm.com, gerald.schaefer@linux.ibm.com,
        farman@linux.ibm.com, iommu@lists.linux-foundation.org,
        linux-s390@vger.kernel.org, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Date:   Fri, 20 May 2022 12:30:33 +0200
In-Reply-To: <20220519182929.581898-1-mjrosato@linux.ibm.com>
References: <20220519182929.581898-1-mjrosato@linux.ibm.com>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Precedence: bulk

On Thu, 2022-05-19 at 14:29 -0400, Matthew Rosato wrote:
> Since commit 0286300e6045 ("iommu: iommu_group_claim_dma_owner() must
> always assign a domain") s390-iommu will get called to allocate multiple
> unmanaged iommu domains for a vfio-pci device -- however the current
> s390-iommu logic tolerates only one.  Recognize that multiple domains can
> be allocated and handle switching between DMA or different iommu domain
> tables during attach_dev.
> 
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---

I know it's applied already and no need to add my R-b but:

Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>