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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-09-02 at 09:51 +0800, harry S wrote:
> 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. 
> 

Setting HCR.TGE requires handling a number of general exceptions.
Without more information on what exactly you have done (i.e. the patch
itself) we can't offer any more advice than you are handling something
wrongly.

BTW, HCR.TGE is rather expensive (since it does trap all sorts of
things, including VM controls etc). 

Ian.

> 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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