[Qemu-devel] [PULL 39/47] target/arm: Always enable pac keys for user-only

[Peter Maydell <peter.maydell@linaro.org>]

From: Richard Henderson <richard.henderson@linaro.org>

Drop the pac properties.  This approach cannot work as written
because the properties are applied before arm_cpu_reset, which
zeros SCTLR_EL1 (amongst everything else).

We can re-introduce the properties if they turn out to be useful.
But since linux 5.0 enables all of the keys, they may not be.

Fixes: 1ae9cfbd470
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/cpu.c   |  3 +++
 target/arm/cpu64.c | 60 ----------------------------------------------
 2 files changed, 3 insertions(+), 60 deletions(-)

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index f00d450d0bd..3874dc98754 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -185,6 +185,9 @@ static void arm_cpu_reset(CPUState *s)
         env->pstate = PSTATE_MODE_EL0t;
         /* Userspace expects access to DC ZVA, CTL_EL0 and the cache ops */
         env->cp15.sctlr_el[1] |= SCTLR_UCT | SCTLR_UCI | SCTLR_DZE;
+        /* Enable all PAC keys.  */
+        env->cp15.sctlr_el[1] |= (SCTLR_EnIA | SCTLR_EnIB |
+                                  SCTLR_EnDA | SCTLR_EnDB);
         /* Enable all PAC instructions */
         env->cp15.hcr_el2 |= HCR_API;
         env->cp15.scr_el3 |= SCR_API;
diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index 8653cecd032..7107ec8d7eb 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -281,38 +281,6 @@ static void cpu_max_set_sve_vq(Object *obj, Visitor *v, const char *name,
     error_propagate(errp, err);
 }
 
-#ifdef CONFIG_USER_ONLY
-static void cpu_max_get_packey(Object *obj, Visitor *v, const char *name,
-                               void *opaque, Error **errp)
-{
-    ARMCPU *cpu = ARM_CPU(obj);
-    const uint64_t *bit = opaque;
-    bool enabled = (cpu->env.cp15.sctlr_el[1] & *bit) != 0;
-
-    visit_type_bool(v, name, &enabled, errp);
-}
-
-static void cpu_max_set_packey(Object *obj, Visitor *v, const char *name,
-                               void *opaque, Error **errp)
-{
-    ARMCPU *cpu = ARM_CPU(obj);
-    Error *err = NULL;
-    const uint64_t *bit = opaque;
-    bool enabled;
-
-    visit_type_bool(v, name, &enabled, errp);
-
-    if (!err) {
-        if (enabled) {
-            cpu->env.cp15.sctlr_el[1] |= *bit;
-        } else {
-            cpu->env.cp15.sctlr_el[1] &= ~*bit;
-        }
-    }
-    error_propagate(errp, err);
-}
-#endif
-
 /* -cpu max: if KVM is enabled, like -cpu host (best possible with this host);
  * otherwise, a CPU with as many features enabled as our emulation supports.
  * The version of '-cpu max' for qemu-system-arm is defined in cpu.c;
@@ -388,34 +356,6 @@ static void aarch64_max_initfn(Object *obj)
          */
         cpu->ctr = 0x80038003; /* 32 byte I and D cacheline size, VIPT icache */
         cpu->dcz_blocksize = 7; /*  512 bytes */
-
-        /*
-         * Note that Linux will enable enable all of the keys at once.
-         * But doing it this way will allow experimentation beyond that.
-         */
-        {
-            static const uint64_t apia_bit = SCTLR_EnIA;
-            static const uint64_t apib_bit = SCTLR_EnIB;
-            static const uint64_t apda_bit = SCTLR_EnDA;
-            static const uint64_t apdb_bit = SCTLR_EnDB;
-
-            object_property_add(obj, "apia", "bool", cpu_max_get_packey,
-                                cpu_max_set_packey, NULL,
-                                (void *)&apia_bit, &error_fatal);
-            object_property_add(obj, "apib", "bool", cpu_max_get_packey,
-                                cpu_max_set_packey, NULL,
-                                (void *)&apib_bit, &error_fatal);
-            object_property_add(obj, "apda", "bool", cpu_max_get_packey,
-                                cpu_max_set_packey, NULL,
-                                (void *)&apda_bit, &error_fatal);
-            object_property_add(obj, "apdb", "bool", cpu_max_get_packey,
-                                cpu_max_set_packey, NULL,
-                                (void *)&apdb_bit, &error_fatal);
-
-            /* Enable all PAC keys by default.  */
-            cpu->env.cp15.sctlr_el[1] |= SCTLR_EnIA | SCTLR_EnIB;
-            cpu->env.cp15.sctlr_el[1] |= SCTLR_EnDA | SCTLR_EnDB;
-        }
 #endif
 
         cpu->sve_max_vq = ARM_MAX_VQ;
-- 
2.20.1