From: Ian Campbell <ian.campbell@citrix.com>
Date: Mon, 30 Mar 2015 11:12:27 +0000 (+0100)
Subject: xen: arm: do not handle traps accessing CLIDR_EL1 or CCSIDR_EL1
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~3497
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=0261157229f1213e89636dc4d6c08b910121a8ea;p=xen.git

xen: arm: do not handle traps accessing CLIDR_EL1 or CCSIDR_EL1

They are trapped only with HCR_EL2.TID2 which we don't set, and in any
case we handled only for 32-bit.

One day we may want to trap and emulate these, but for now don't
bother with the dead code.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Julien Grall <julien.grall@linaro.org>
---

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index e13b959b3e..22beab7e43 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1564,24 +1564,6 @@ static void do_cp15_32(struct cpu_user_regs *regs,
 
     switch ( hsr.bits & HSR_CP32_REGS_MASK )
     {
-    case HSR_CPREG32(CLIDR):
-        if ( !cp32.read )
-        {
-            dprintk(XENLOG_ERR,
-                    "attempt to write to read-only register CLIDR\n");
-            domain_crash_synchronous();
-        }
-        *r = READ_SYSREG32(CLIDR_EL1);
-        break;
-    case HSR_CPREG32(CCSIDR):
-        if ( !cp32.read )
-        {
-            dprintk(XENLOG_ERR,
-                    "attempt to write to read-only register CCSIDR\n");
-            domain_crash_synchronous();
-        }
-        *r = READ_SYSREG32(CCSIDR_EL1);
-        break;
     case HSR_CPREG32(DCCISW):
         if ( cp32.read )
         {