Amazon AMIs

[Colin Percival]

On 5/28/19 5:52 AM, Andriy Gapon wrote:
> On 21/02/2019 18:17, Warner Losh wrote:
>> It's hot-unplug that doesn't work quite right. Hotplug works, I believe, if
>> you have PCI_HP in your kernel, I believe.
>>
>> What's needed is about a solid week of cleanup and testing in this area,
>> however.
> 
> I am not sure about the context of the latest question... whether it was about
> NVMe hot-plug on real modern hardware or whether it was still about AWS.
> In the latter case, as Colin pointed out earlier[*], PCI_HP would not help at
> all, because the emulated bridge is not a PCIe bridge.
> It seems that they use a mechanism based on an older specification, PCI Standard
> Hot-Plug Controller and Subsystem Specification.

Right, these EC2 instances look like they have NVMe devices being hotplugged
on a legacy PCI bus attached to an Intel 440FX chipset.  There is no real
hardware which behaves the same way as these VMs.

-- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid