[Xen-devel] [PATCH 18/19] xen: arm: Annotate registers trapped when CNTHCTL_EL2.EL1PCEN == 0

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/traps.c |   20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 1c9cf21..cc5b8dd 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1642,6 +1642,12 @@ static void do_cp15_32(struct cpu_user_regs *regs,
 
     switch ( hsr.bits & HSR_CP32_REGS_MASK )
     {
+    /*
+     * !CNTHCTL_EL2.EL1PCEN / !CNTHCTL.PL1PCEN
+     *
+     * ARMv7 (DDI 0406C.b): B4.1.22
+     * ARMv8 (DDI 0487A.d): D1-1510 Table D1-60
+     */
     case HSR_CPREG32(CNTP_CTL):
     case HSR_CPREG32(CNTP_TVAL):
         if ( !vtimer_emulate(regs, hsr) )
@@ -1757,6 +1763,12 @@ static void do_cp15_64(struct cpu_user_regs *regs,
 
     switch ( hsr.bits & HSR_CP64_REGS_MASK )
     {
+    /*
+     * !CNTHCTL_EL2.EL1PCEN / !CNTHCTL.PL1PCEN
+     *
+     * ARMv7 (DDI 0406C.b): B4.1.22
+     * ARMv8 (DDI 0487A.d): D1-1510 Table D1-60
+     */
     case HSR_CPREG64(CNTP_CVAL):
         if ( !vtimer_emulate(regs, hsr) )
             return inject_undef_exception(regs, hsr);
@@ -2120,14 +2132,18 @@ static void do_sysreg(struct cpu_user_regs *regs,
          */
         return handle_raz_wi(regs, x, hsr.sysreg.read, hsr, 1);
 
-    /* Write only, Write ignore registers: */
-
+    /*
+     * !CNTHCTL_EL2.EL1PCEN
+     *
+     * ARMv8 (DDI 0487A.d): D1-1510 Table D1-60
+     */
     case HSR_SYSREG_CNTP_CTL_EL0:
     case HSR_SYSREG_CNTP_TVAL_EL0:
     case HSR_SYSREG_CNTP_CVAL_EL0:
         if ( !vtimer_emulate(regs, hsr) )
             return inject_undef_exception(regs, hsr);
         break;
+
     case HSR_SYSREG_ICC_SGI1R_EL1:
         if ( !vgic_emulate(regs, hsr) )
         {
-- 
1.7.10.4


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