[Xen-devel] RE: Avoid alloc for xsave before xsave_init

["Huang2, Wei" <Wei.Huang2@xxxxxxx>]

Hi Gang,

Was the issue caused by the uninitialized variable xsave_cntxt_size, triggering 
problem for _xmalloc()? If so, one solution is to set xsave_cntxt_size=576 (the 
default value after reset) as a default value. When xsave_alloc_save_area() is 
called for idel VCPU, _xmalloc() will initialize 576 bytes. Idle domain doesn't 
change xcr0 from my understanding. So its xcr0 is XSTATE_FP_SSE all the time. 

Best,
-Wei

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Wei, Gang
Sent: Thursday, January 13, 2011 12:49 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Keir Fraser; Wei, Gang
Subject: [Xen-devel] Avoid alloc for xsave before xsave_init

While debugging some weird booting failure bugs, just found currently, 
xsave_alloc_save_area will be called in 
init_idle_domain->scheduler_init->alloc_vcpu->vcpu_initialise calls, it is 
earlier than xsave_init called in identity_cpu(). This may causing buffer 
overflow on xmem_pool. I am thinking about how to fix it.

Jimmy

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