From: Dan Williams <dan.j.williams@intel.com>
To: Lukas Wunner <lukas@wunner.de>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Gavin Hindman <gavin.hindman@intel.com>,
Linuxarm <linuxarm@huawei.com>,
"Weiny, Ira" <ira.weiny@intel.com>,
Linux PCI <linux-pci@vger.kernel.org>,
linux-cxl@vger.kernel.org, CHUCK_LEVER <chuck.lever@oracle.com>
Subject: Re: [RFC PATCH 0/1] DOE usage with pcie/portdrv
Date: Wed, 11 May 2022 12:43:34 -0700 [thread overview]
Message-ID: <CAPcyv4hUKjt7QrA__wQ0KowfaxyQuMjHB5V-=rZBm=UbV4OvSg@mail.gmail.com> (raw)
In-Reply-To: <20220511191943.GB26623@wunner.de>
On Wed, May 11, 2022 at 12:20 PM Lukas Wunner <lukas@wunner.de> wrote:
>
> On Wed, May 11, 2022 at 09:13:45PM +0200, Lukas Wunner wrote:
> > When an IDE-capable device is runtime suspended to D3hot and later
> > runtime resumed to D0, it may not preserve its internal state.
> > (The No_Soft_Reset bit in the Power Management Control/Status Register
> > tells us whether the device is capable of preserving internal state
> > over a transition to D3hot, see PCIe r6.0, sec. 7.5.2.2.)
> >
> > Likewise, when an IDE-capable device is reset (e.g. due to Downstream
> > Port Containment, AER or a bus reset initiated by user space),
> > internal state is lost and must be reconstructed by pci_restore_state().
> > That state includes the SPDM session or IDE encryption.
>
> Digging a little further, sec. 6.33.8 says that "The No_Soft_Reset bit
> must be Set", so at least IDE will always survive a D3hot transition.
>
> But the reset argument still stands: That same section says that all
> IDE streams transition to Insecure and all keys are invalidated upon
> reset.
Right, this isn't the only problem with reset vs ongoing CXL operations...
https://lore.kernel.org/linux-cxl/164740402242.3912056.8303625392871313860.stgit@dwillia2-desk3.amr.corp.intel.com/
next prev parent reply other threads:[~2022-05-11 19:43 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-03 15:34 [RFC PATCH 0/1] DOE usage with pcie/portdrv Jonathan Cameron
2022-05-03 15:34 ` [RFC PATCH 1/1] pcie/portdrv: Hack in DOE and CDAT support Jonathan Cameron
2022-05-06 22:40 ` [RFC PATCH 0/1] DOE usage with pcie/portdrv Dan Williams
2022-05-07 10:18 ` Lukas Wunner
2022-05-09 9:48 ` Jonathan Cameron
2022-05-11 19:13 ` Lukas Wunner
2022-05-11 19:19 ` Lukas Wunner
2022-05-11 19:43 ` Dan Williams [this message]
2022-05-14 13:55 ` Lukas Wunner
2022-05-16 17:01 ` Dan Williams
2022-05-27 9:39 ` Lukas Wunner
2022-05-18 13:43 ` Christoph Hellwig
2022-05-18 15:08 ` Dan Williams
2022-05-20 5:42 ` Lukas Wunner
2022-05-20 15:37 ` Dan Williams
2022-05-20 15:42 ` Chuck Lever III
2022-05-11 19:42 ` Dan Williams
2022-05-11 20:22 ` Hindman, Gavin
2022-05-11 21:04 ` Dan Williams
2022-05-14 13:31 ` Lukas Wunner
2022-05-16 16:53 ` Dan Williams
2022-05-09 9:33 ` Jonathan Cameron
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