[Xen-devel] How to intercept supervisor call using Xen?

[harry2845 <harry2845@xxxxxxxxx>]

After reading the document of ARM, I set HCR.TGE to 1 at the init time. 

   
WRITE_SYSREG(HCR_TGE|HCR_PTW|HCR_BSU_OUTER|HCR_AMO|HCR_IMO|HCR_VM|HCR_TWI|HCR_TSC|
 
                 HCR_TAC, HCR_EL2); 

And I add a case in the function do_trap_hyperviosr. 

But after modifying, there will be a kernel panic when I execute Xen. 

[    7.866384] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0000000b 
[    7.866384] 
[    7.881866] CPU: 0 PID: 1 Comm: init Not tainted 3.15.0-rc5+ #91 
[    7.891024] [<80017dc4>] (unwind_backtrace) from [<800138f8>]
(show_stack+0x20/0x24) 
[    7.903640] [<800138f8>] (show_stack) from [<807864a4>]
(dump_stack+0x70/0xc0) 
[    7.915213] [<807864a4>] (dump_stack) from [<80781030>]
(panic+0x9c/0x204) 
[    7.926088] [<80781030>] (panic) from [<8002c900>] (do_exit+0x86c/0x9f0) 
[    7.936615] [<8002c900>] (do_exit) from [<8002cbc0>]
(do_group_exit+0x4c/0xcc) 
[    7.948188] [<8002cbc0>] (do_group_exit) from [<8003b5dc>]
(get_signal_to_deliver+0x37c/0x71c) 
[    7.962535] [<8003b5dc>] (get_signal_to_deliver) from [<80780aec>]
(do_signal+0xb4/0x380) 
[    7.976013] [<80780aec>] (do_signal) from [<800131a8>]
(do_work_pending+0x8c/0xe0) 
[    7.988278] [<800131a8>] (do_work_pending) from [<8000f680>]
(work_pending+0xc/0x20) 
[    8.000901] ---[ end Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0000000b 
[    8.000901] 




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