[Xen-ia64-devel] [Query] Regarding dtlb_miss Handler

[jeet <jeet_sat12@xxxxxxxxxxx>]

Hi All

I am trying to understand dtlb_miss handler for VMX domain, which 
would be called when VHPT walker could not find the entry in VHPT. 

I have some queries

In following lines, check is made for vm bit in PSR when interrupt occur
Is this means, if currently guest is running(vm=1) and flow would go to line 
225 and 
otherwise it would jump to vmx_alt_dtlb_miss_1(vm=0),  when this case would 
occur?

xen-3.0.4_1-src/xen/arch/ia64/vmx/vmx_ivt.S

line216 ENTRY(vmx_dtlb_miss)
..

..
line223        tbit.z p6,p7=r29,IA64_PSR_VM_BIT;
line224     (p6)br.sptk vmx_alt_dtlb_miss_1
line 225      mov r16 = cr.ifa

So would code after line 225 be executed when guest is running?
if so the executing the privilege instructions itc.d (line268) would cause 
virtualization fault?
which would give controls to virtualization fault handler?

Is my understanding is correct? if not please if anyone could explain this, 
that would be great help

~Jeet




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