linux-kernel - Re: [PATCH] iommu/s390: tolerate repeat attach

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220519225846.GD1343366@nvidia.com>
Date:   Thu, 19 May 2022 19:58:46 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>
Cc:     joro@...tes.org, will@...nel.org, alex.williamson@...hat.com,
        cohuck@...hat.com, borntraeger@...ux.ibm.com,
        schnelle@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        farman@...ux.ibm.com, iommu@...ts.linux-foundation.org,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/s390: tolerate repeat attach_dev calls

On Thu, May 19, 2022 at 02:29:29PM -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@...ux.ibm.com>
> ---
>  drivers/iommu/s390-iommu.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)

Makes senese, thanks

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason