[Bug 217744] XEN:kernel does not support for canceled suspend

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217744

            Bug ID: 217744
           Summary: XEN:kernel does not support for canceled suspend
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ouyangzhaowei at huawei.com

When running on Xen, it's possible that a suspend request to the hypervisor
fails(return from HYPERVISOR_suspend different than 0), such as when VM dirty
pages are faster than the rate of copying. This means that the suspend hasn't
succeed, and the resume procedure needs to properly handle this case.

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