Displaying 1 result from an estimated 1 matches for "hap_xxx_vram_track".
2012 Nov 29
4
[PATCH] x86/hap: fix race condition between ENABLE_LOGDIRTY and track_dirty_vram hypercall
...dirty_vram = NULL;
return rc;
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Actually I encountered the xen crash by null pointer exception in xen-3.4.
FYI, in xen-4.x, c/s 19738:8dd5c3cae086 mitigated it.
I''m not sure why paging_lock() is used partially in hap_XXX_vram_tracking
functions. Thus, this patch introduces a new lock.
It would be better to use paging_lock() instead of the new lock
since shadow paging mode (not HAP mode) uses paging_lock to avoid
this race condition.
Thanks,
Kouya
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
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