target/arm: allow DC CVA[D]P in user mode emulation

DC CVAP and DC CVADP instructions can be executed in EL0 on Linux,
either directly when SCTLR_EL1.UCI == 1 or emulated by the kernel (see
user_cache_maint_handler() in arch/arm64/kernel/traps.c).

This patch enables execution of the two instructions in user mode
emulation.

Signed-off-by: Zhuojia Shen <chaosdefinition@hotmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/helper.c

@@ -7405,7 +7405,6 @@ static const ARMCPRegInfo rndr_reginfo[] = {
       .access = PL0_R, .readfn = rndr_readfn },
 };
 
-#ifndef CONFIG_USER_ONLY
 static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
                           uint64_t value)
 {
@@ -7420,6 +7419,7 @@ static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
     /* This won't be crossing page boundaries */
     haddr = probe_read(env, vaddr, dline_size, mem_idx, GETPC());
     if (haddr) {
+#ifndef CONFIG_USER_ONLY
 
         ram_addr_t offset;
         MemoryRegion *mr;
@@ -7430,6 +7430,7 @@ static void dccvap_writefn(CPUARMState *env, const ARMCPRegInfo *opaque,
         if (mr) {
             memory_region_writeback(mr, offset, dline_size);
         }
+#endif /*CONFIG_USER_ONLY*/
     }
 }
 
@@ -7448,7 +7449,6 @@ static const ARMCPRegInfo dcpodp_reg[] = {
       .fgt = FGT_DCCVADP,
       .accessfn = aa64_cacheop_poc_access, .writefn = dccvap_writefn },
 };
-#endif /*CONFIG_USER_ONLY*/
 
 static CPAccessResult access_aa64_tid5(CPUARMState *env, const ARMCPRegInfo *ri,
                                        bool isread)
@@ -9092,7 +9092,6 @@ void register_cp_regs_for_features(ARMCPU *cpu)
     if (cpu_isar_feature(aa64_tlbios, cpu)) {
         define_arm_cp_regs(cpu, tlbios_reginfo);
     }
-#ifndef CONFIG_USER_ONLY
     /* Data Cache clean instructions up to PoP */
     if (cpu_isar_feature(aa64_dcpop, cpu)) {
         define_one_arm_cp_reg(cpu, dcpop_reg);
@@ -9101,7 +9100,6 @@ void register_cp_regs_for_features(ARMCPU *cpu)
             define_one_arm_cp_reg(cpu, dcpodp_reg);
         }
     }
-#endif /*CONFIG_USER_ONLY*/
 
     /*
      * If full MTE is enabled, add all of the system registers.