On Wed, Dec 9, 2015 at 8:26 AM, Lan, Tianyu <tianyu.lan@xxxxxxxxx> wrote: > For other kind of devices, it's hard to work. > We are also adding migration support for QAT(QuickAssist Technology) device. > > QAT device user case introduction. > Server, networking, big data, and storage applications use QuickAssist > Technology to offload servers from handling compute-intensive operations, > such as: > 1) Symmetric cryptography functions including cipher operations and > authentication operations > 2) Public key functions including RSA, Diffie-Hellman, and elliptic curve > cryptography > 3) Compression and decompression functions including DEFLATE and LZS > > PCI hotplug will not work for such devices during migration and these > operations will fail when unplug device. I assume the problem is that with a PCI hotplug event you are losing the state information for the device, do I have that right? Looking over the QAT drivers it doesn't seem like any of them support the suspend/resume PM calls. I would imagine it makes it difficult for a system with a QAT card in it to be able to drop the system to a low power state. You might want to try enabling suspend/resume support for the devices on bare metal before you attempt to take on migration as it would provide you with a good testing framework to see what needs to be saved/restored within the device and in what order before you attempt to do the same while migrating from one system to another. - Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
