[Xen-devel] Restoring an HVM domain with PV drivers fails if VCPUs >= 4.

[Yoshisato YANAGISAWA <yanagisawa.yoshisato@xxxxxxxxxxxxx>]

Hi,

Does anybody who has an experience to save and restore an HVM domain
with VCPUs >= 4 and PV drivers?

I tried save and restore an HVM domain that has 4 VCPUs with PV drivers
enabled, and failed to restore.  Restored domain did not respond to any
inputs including virtual console, VNC, network I/O (through ssh, ping)
and so on.  According to the result of xentop, I saw 400% CPU usage of
the restored domain.

This problem did not happen if an HVM domain has less than or equals to
3 VCPUs.  This problem also did not happen if an HVM domain without PV
drivers.  Because of the situation, I suppose there might be some bugs
in PV drivers.

I am using i386 Dom0 on Xen 3.3.0, and PV drivers are installed from
source code included in Xen 3.3.0.

Do you have any ideas to attack this problem?

Thank you in advance,
Yoshisato YANAGISAWA.

-- 
Yoshisato YANAGISAWA, Ph.D.
Open Source Software Computing Project
NTT Cyber Space Laboratories
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
1-1 Hikarinooka, Yokosuka-Shi,
Kanagawa 239-0847, Japan

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