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From: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
To: qemu-devel@nongnu.org
Cc: figlesia@xilinx.com, peter.maydell@linaro.org,
	sstabellini@kernel.org, edgar.iglesias@xilinx.com,
	sai.pavan.boddu@xilinx.com, frasse.iglesias@gmail.com,
	alistair@alistair23.me, richard.henderson@linaro.org,
	frederic.konrad@adacore.com, qemu-arm@nongnu.org,
	philmd@redhat.com, luc.michel@greensocs.com
Subject: [PATCH v1 1/1] target/microblaze: mbar: Trap sleeps from user-space
Date: Mon, 17 Aug 2020 19:30:45 +0200	[thread overview]
Message-ID: <20200817173045.437534-2-edgar.iglesias@gmail.com> (raw)
In-Reply-To: <20200817173045.437534-1-edgar.iglesias@gmail.com>

From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Trap mbar-sleeps from user-space.

Reported-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 target/microblaze/translate.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c
index 530c15e5ad..a96cb21d96 100644
--- a/target/microblaze/translate.c
+++ b/target/microblaze/translate.c
@@ -1250,6 +1250,11 @@ static void dec_br(DisasContext *dc)
 
             LOG_DIS("sleep\n");
 
+            if (trap_userspace(dc, true)) {
+                /* Sleep is a privileged instruction.  */
+                return;
+            }
+
             t_sync_flags(dc);
             tcg_gen_st_i32(tmp_1, cpu_env,
                            -offsetof(MicroBlazeCPU, env)
-- 
2.25.1



  reply	other threads:[~2020-08-17 17:32 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-17 17:30 [PATCH v1 0/1] target/microblaze: mbar: Trap sleeps from user-space Edgar E. Iglesias
2020-08-17 17:30 ` Edgar E. Iglesias [this message]
2020-08-18  0:06   ` [PATCH v1 1/1] " Richard Henderson

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