From: "Zeng, Xin" <xin.zeng@intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Yishai Hadas <yishaih@nvidia.com>,
"herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"shameerali.kolothum.thodi@huawei.com"
<shameerali.kolothum.thodi@huawei.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
qat-linux <qat-linux@intel.com>,
"Cao, Yahui" <yahui.cao@intel.com>
Subject: RE: [PATCH 10/10] vfio/qat: Add vfio_pci driver for Intel QAT VF devices
Date: Tue, 20 Feb 2024 15:53:08 +0000 [thread overview]
Message-ID: <DM4PR11MB5502BE3CC8BD098584F31E8D88502@DM4PR11MB5502.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20240220132459.GM13330@nvidia.com>
On Tuesday, February 20, 2024 9:25 PM, Jason Gunthorpe wrote:
> To: Zeng, Xin <xin.zeng@intel.com>
> Cc: Yishai Hadas <yishaih@nvidia.com>; herbert@gondor.apana.org.au;
> alex.williamson@redhat.com; shameerali.kolothum.thodi@huawei.com; Tian,
> Kevin <kevin.tian@intel.com>; linux-crypto@vger.kernel.org;
> kvm@vger.kernel.org; qat-linux <qat-linux@intel.com>; Cao, Yahui
> <yahui.cao@intel.com>
> Subject: Re: [PATCH 10/10] vfio/qat: Add vfio_pci driver for Intel QAT VF devices
>
> On Sat, Feb 17, 2024 at 04:20:20PM +0000, Zeng, Xin wrote:
>
> > Thanks for this information, but this flow is not clear to me why it
> > cause deadlock. From this flow, CPU0 is not waiting for any resource
> > held by CPU1, so after CPU0 releases mmap_lock, CPU1 can continue
> > to run. Am I missing something?
>
> At some point it was calling copy_to_user() under the state
> mutex. These days it doesn't.
>
> copy_to_user() would nest the mm_lock under the state mutex which is a
> locking inversion.
>
> So I wonder if we still have this problem now that the copy_to_user()
> is not under the mutex?
In protocol v2, we still have the scenario in precopy_ioctl where copy_to_user is
called under state_mutex.
Thanks,
Xin
next prev parent reply other threads:[~2024-02-20 15:53 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-01 15:33 [PATCH 00/10] crypto: qat - enable SRIOV VF live migration for Xin Zeng
2024-02-01 15:33 ` [PATCH 01/10] crypto: qat - adf_get_etr_base() helper Xin Zeng
2024-02-01 15:33 ` [PATCH 02/10] crypto: qat - relocate and rename 4xxx PF2VM definitions Xin Zeng
2024-02-01 15:33 ` [PATCH 03/10] crypto: qat - move PFVF compat checker to a function Xin Zeng
2024-02-01 15:33 ` [PATCH 04/10] crypto: qat - relocate CSR access code Xin Zeng
2024-02-01 15:33 ` [PATCH 05/10] crypto: qat - rename get_sla_arr_of_type() Xin Zeng
2024-02-01 15:33 ` [PATCH 06/10] crypto: qat - expand CSR operations for QAT GEN4 devices Xin Zeng
2024-02-01 15:33 ` [PATCH 07/10] crypto: qat - add bank save and restore flows Xin Zeng
2024-02-04 7:49 ` [EXTERNAL] " Kamlesh Gurudasani
2024-02-19 3:41 ` Wan, Siming
2024-02-01 15:33 ` [PATCH 08/10] crypto: qat - add interface for live migration Xin Zeng
2024-02-01 15:33 ` [PATCH 09/10] crypto: qat - implement " Xin Zeng
2024-02-01 15:33 ` [PATCH 10/10] vfio/qat: Add vfio_pci driver for Intel QAT VF devices Xin Zeng
2024-02-06 12:55 ` Jason Gunthorpe
2024-02-09 8:23 ` Zeng, Xin
2024-02-09 12:10 ` Jason Gunthorpe
2024-02-11 8:17 ` Yishai Hadas
2024-02-17 16:20 ` Zeng, Xin
2024-02-20 13:24 ` Jason Gunthorpe
2024-02-20 15:53 ` Zeng, Xin [this message]
2024-02-20 17:03 ` Jason Gunthorpe
2024-02-21 8:44 ` Zeng, Xin
2024-02-21 13:18 ` Jason Gunthorpe
2024-02-21 15:11 ` Yishai Hadas
2024-02-22 9:39 ` Yishai Hadas
2024-02-06 21:14 ` Alex Williamson
2024-02-09 16:16 ` Zeng, Xin
2024-02-08 12:17 ` Shameerali Kolothum Thodi
2024-02-13 13:08 ` Zeng, Xin
2024-02-13 14:55 ` Jason Gunthorpe
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