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authorIan Campbell <ian.campbell@citrix.com>2011-02-14 17:02:55 +0000
committerIan Campbell <ian.campbell@citrix.com>2011-02-14 17:02:55 +0000
commit6589a2fe4e50d03b97a320ed3fe845e383140bed (patch)
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libxl: fix migrate for HVM guests
Prior to 22909:6868f7f3ab3f libxl would loop waiting simultaneously for the domain the acknowledge a PV suspend request (by clearing the XenStore node) and for the domain to actually suspend. For HVM guests without PV drivers this same loop was simply waiting for the domain to suspend. In 22909:6868f7f3ab3f the original loop was split into two loops (first waiting for the acknowledgement and then for the actual suspend). This caused libxl to incorrectly wait for an HVM guest without PV drivers to acknowledge the XenStore request, which is not something it would ever do. Fix this by only waiting for an acknowledgement from a guest which contains PV drivers. Previously we were also making the request regardless of whether the guest had PV drivers, change that to only make the request if the guest has PV drivers. Lastly there is no need to sample HVM_PARAM_ACPI_S_STATE twice and not doing so simplifies the test for PVHVM vs. normal HVM guests. Tested with: Windows with GPL PV drivers (event channel suspend mode) Windows without PV drivers (xc_domain_shutdown mode) Linux PV (PV with XenBus control node mode) Linux HVM (PVHVM with XenBus control node mode (*)) Linux HVM (xc_domain_shutdown mode) (*) In this case the kernel didn't actually suspend, due to: PM: Device input1 failed to suspend: error -22 xen suspend: dpm_suspend_start -22 which may be a misconfiguration in my setup or may be a kernel bug, but the libxl side dealt with this as gracefully as it could. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
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