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[PATCH v3 3/8] target/ppc: Fix move-to timebase SPR access permissions


From: Nicholas Piggin
Subject: [PATCH v3 3/8] target/ppc: Fix move-to timebase SPR access permissions
Date: Fri, 1 Dec 2023 22:16:31 +1000

The move-to timebase registers TBU and TBL can not be read, and they
can not be written in supervisor mode on hypervisor-capable CPUs.

Reviewed-by: C├ędric Le Goater <clg@kaod.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 target/ppc/helper_regs.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/target/ppc/helper_regs.c b/target/ppc/helper_regs.c
index 6f190ab13b..f1493ddca0 100644
--- a/target/ppc/helper_regs.c
+++ b/target/ppc/helper_regs.c
@@ -468,18 +468,33 @@ void register_generic_sprs(PowerPCCPU *cpu)
                  &spr_read_tbl, SPR_NOACCESS,
                  &spr_read_tbl, SPR_NOACCESS,
                  0x00000000);
-    spr_register(env, SPR_WR_TBL, "TBL",
-                 &spr_read_tbl, SPR_NOACCESS,
-                 &spr_read_tbl, &spr_write_tbl,
-                 0x00000000);
     spr_register(env, SPR_TBU, "TBU",
                  &spr_read_tbu, SPR_NOACCESS,
                  &spr_read_tbu, SPR_NOACCESS,
                  0x00000000);
-    spr_register(env, SPR_WR_TBU, "TBU",
-                 &spr_read_tbu, SPR_NOACCESS,
-                 &spr_read_tbu, &spr_write_tbu,
-                 0x00000000);
+#ifndef CONFIG_USER_ONLY
+    if (env->has_hv_mode) {
+        spr_register_hv(env, SPR_WR_TBL, "TBL",
+                        SPR_NOACCESS, SPR_NOACCESS,
+                        SPR_NOACCESS, SPR_NOACCESS,
+                        SPR_NOACCESS, &spr_write_tbl,
+                        0x00000000);
+        spr_register_hv(env, SPR_WR_TBU, "TBU",
+                        SPR_NOACCESS, SPR_NOACCESS,
+                        SPR_NOACCESS, SPR_NOACCESS,
+                        SPR_NOACCESS, &spr_write_tbu,
+                        0x00000000);
+    } else {
+        spr_register(env, SPR_WR_TBL, "TBL",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     SPR_NOACCESS, &spr_write_tbl,
+                     0x00000000);
+        spr_register(env, SPR_WR_TBU, "TBU",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     SPR_NOACCESS, &spr_write_tbu,
+                     0x00000000);
+    }
+#endif
 }
 
 void register_non_embedded_sprs(CPUPPCState *env)
-- 
2.42.0




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