linux-kernel - RE: [PATCH] intel-iommu: Turn off translations at shutdown

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Message-ID: <8D8B600C3EC1B64FAD4503F0B66C61F23BC0DC@SHSMSX103.ccr.corp.intel.com>
Date:   Mon, 11 Nov 2019 00:39:15 +0000
From:   "Zeng, Jason" <jason.zeng@...el.com>
To:     Deepa Dinamani <deepa.kernel@...il.com>
CC:     David Woodhouse <dwmw2@...radead.org>,
        "joro@...tes.org" <joro@...tes.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Zeng, Jason" <jason.zeng@...el.com>
Subject: RE: [PATCH] intel-iommu: Turn off translations at shutdown

> -----Original Message-----
> > > > For VMM live update case, we should be able to detect and bypass
> > > > the shutdown that Deepa introduced here, so keep IOMMU still
> operating?
> > >
> > > Is that a 'yes' to Deepa's "if someone wants to make it conditional,
> > > we can do that" ?
> >
> > Yes, I think so. Thanks!
> 
> Are these changes already part of the kernel like avoiding shutdown of the
> passthrough devices? device_shutdown() doesn't seem to be doing anything
> selectively as of now.
> 

No, it is not in upstream yet. It is an on-going effort, which tries to kexec reboot
the host while keeping IOMMU still working.

Thanks,
Jason

> Thanks,
> Deepa