[Stable-8.1.3 58/59] target/arm: HVC at EL3 should go to EL3, not EL2

[Michael Tokarev]

From: Peter Maydell <peter.maydell@linaro.org>

AArch64 permits code at EL3 to use the HVC instruction; however the
exception we take should go to EL3, not down to EL2 (see the pseudocode
AArch64.CallHypervisor()). Fix the target EL.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar@zeroasic.com>
Message-id: 20231109151917.1925107-1-peter.maydell@linaro.org
(cherry picked from commit fc58891d0422607d172a3d6b3158798f2556aef1)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 58787ee8a7..7267f172d7 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -2355,6 +2355,8 @@ static bool trans_SVC(DisasContext *s, arg_i *a)
 
 static bool trans_HVC(DisasContext *s, arg_i *a)
 {
+    int target_el = s->current_el == 3 ? 3 : 2;
+
     if (s->current_el == 0) {
         unallocated_encoding(s);
         return true;
@@ -2367,7 +2369,7 @@ static bool trans_HVC(DisasContext *s, arg_i *a)
     gen_helper_pre_hvc(cpu_env);
     /* Architecture requires ss advance before we do the actual work */
     gen_ss_advance(s);
-    gen_exception_insn_el(s, 4, EXCP_HVC, syn_aa64_hvc(a->imm), 2);
+    gen_exception_insn_el(s, 4, EXCP_HVC, syn_aa64_hvc(a->imm), target_el);
     return true;
 }
 
-- 
2.39.2