[Bug 226562] [stable/10] backport pci/cardbus hot-remove support from FreeBSD 11 to 10

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226562

            Bug ID: 226562
           Summary: [stable/10] backport pci/cardbus hot-remove support
                    from FreeBSD 11 to 10
           Product: Base System
           Version: 10.4-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: decui at microsoft.com

About 2 years ago, jhb fixed the PCI hot-remove issue in FreeBSD 11 with this
patch: https://github.com/freebsd/freebsd/commit/01f4e87387, but the patch
didn't make it into FreeBSD stable/10 and 10.4.

Now when I test Mellanox SR-IOV VF with FreeBSD 10.4 VM on Hyper-V, the VM can
easily panic when the VF is removed from the VM. I think it's because the above
patch is missing here.

Discussed with jhb and it looks we need to MFC more related patches from 11 to
10 to have a complete support of PCI/CardBus hotplug in FreeBSD stable/10.

BTW, https://www.freebsd.org/security/security.html#sup shows the expected EoL
date for stable/10 is October 31, 2018, but I believe many users can stick to
10.4 and stable/10 for a long time...

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