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enable_logdirty
2012 Nov 29
4
[PATCH] x86/hap: fix race condition between ENABLE_LOGDIRTY and track_dirty_vram hypercall
There is a race condition between XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY
and HVMOP_track_dirty_vram hypercall.
Although HVMOP_track_dirty_vram is called many times from qemu-dm
which is connected via VNC, XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY is
called only once from a migration process (e.g. xc_save, libxl-save-helper).
So the race seldom happens, but the following cases are possible.