target/arm: take HSTR traps of cp15 accesses to EL2, not EL1

The HSTR_EL2 register allows the hypervisor to trap AArch32 EL1 and
EL0 accesses to cp15 registers.  We incorrectly implemented this so
they trap to EL1 when we detect the need for a HSTR trap at code
generation time.  (The check in access_check_cp_reg() which we do at
runtime to catch traps from EL0 is correctly routing them to EL2.)

Use the correct target EL when generating the code to take the trap.

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2226
Fixes: 049edad ("target/arm: Make HSTR_EL2 traps take priority over UNDEF-at-EL1")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240325133116.2075362-1-peter.maydell@linaro.org

target/arm/tcg/translate.c

@@ -4585,7 +4585,7 @@ static void do_coproc_insn(DisasContext *s, int cpnum, int is64,
             tcg_gen_andi_i32(t, t, 1u << maskbit);
             tcg_gen_brcondi_i32(TCG_COND_EQ, t, 0, over.label);
 
-            gen_exception_insn(s, 0, EXCP_UDEF, syndrome);
+            gen_exception_insn_el(s, 0, EXCP_UDEF, syndrome, 2);
             /*
              * gen_exception_insn() will set is_jmp to DISAS_NORETURN,
              * but since we're conditionally branching over it, we want