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Re: [Xen-devel] [PATCH 1/2] arm: smccc: handle SMCs/HVCs according to SMCCC





On 27/06/17 15:40, Volodymyr Babchuk wrote:
Hello Julien,


On 27.06.17 14:08, Julien Grall wrote:
On 06/22/2017 05:29 PM, Volodymyr Babchuk wrote:
Hi Julien,

Hi Volodymyr,

On 15.06.17 13:48, Julien Grall wrote:
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 6cf9ee7..2d0b058 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -44,6 +44,7 @@
 #include <asm/cpufeature.h>
 #include <asm/flushtlb.h>
 #include <asm/monitor.h>
+#include <asm/smccc.h>

 #include "decode.h"
 #include "vtimer.h"
@@ -2781,11 +2782,16 @@ static void do_trap_smc(struct
cpu_user_regs *regs, const union hsr hsr)
 {

I think it would make sense to push this function in the new file.
Unfortunately, I can't do this, because it uses local functions such as
inject_undef_exception() or advance_pc().

The code is not set in stone. It is perfectly fine to rework it if it
does not fit.
Okay. Probably, I can put forward declarations of the mentioned
functions into as-arm/processor.h.
Should I leave implementation of those functions in the traps.c or
should I move them into processor.c ?


Also, I was expecting some change in the HVC path as you say that
this will be used for both HVC and SMC.
Actually, I plan to use this particular function to handle only SMCs,
because it does SMC-specific tasks, such as calling to a monitor.

HVCs will be handled in different call path in the next patch,
because currently HVC callpath is used by PSCI code.

But your commit title says: "handle SMCs/HVCs according to SMCCC". So
something does not match...
Yes, you are right. I'll rework the patches.

Will you review the V2 series or should I push V3?

I will review the v2 series. I will try to do it today or tomorrow.

Cheers,

--
Julien Grall

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