Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20210727' into staging

target-arm queue:
 * hw/arm/smmuv3: Check 31st bit to see if CD is valid
 * qemu-options.hx: Fix formatting of -machine memory-backend option
 * hw: aspeed_gpio: Fix memory size
 * hw/arm/nseries: Display hexadecimal value with '0x' prefix
 * Add sve-default-vector-length cpu property
 * docs: Update path that mentions deprecated.rst
 * hw/intc/armv7m_nvic: for v8.1M VECTPENDING hides S exceptions from NS
 * hw/intc/armv7m_nvic: Correct size of ICSR.VECTPENDING
 * hw/intc/armv7m_nvic: ISCR.ISRPENDING is set for non-enabled pending interrupts
 * target/arm: Report M-profile alignment faults correctly to the guest
 * target/arm: Add missing 'return's after calling v7m_exception_taken()
 * target/arm: Enforce that M-profile SP low 2 bits are always zero

# gpg: Signature made Tue 27 Jul 2021 11:46:17 BST
# gpg:                using RSA key E1A5C593CD419DE28E8315CF3C2525ED14360CDE
# gpg:                issuer "peter.maydell@linaro.org"
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" [ultimate]
# gpg:                 aka "Peter Maydell <pmaydell@gmail.com>" [ultimate]
# gpg:                 aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" [ultimate]
# Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83  15CF 3C25 25ED 1436 0CDE

* remotes/pmaydell/tags/pull-target-arm-20210727:
  hw: aspeed_gpio: Fix memory size
  hw/arm/nseries: Display hexadecimal value with '0x' prefix
  target/arm: Add sve-default-vector-length cpu property
  target/arm: Export aarch64_sve_zcr_get_valid_len
  target/arm: Correctly bound length in sve_zcr_get_valid_len
  docs: Update path that mentions deprecated.rst
  hw/intc/armv7m_nvic: for v8.1M VECTPENDING hides S exceptions from NS
  hw/intc/armv7m_nvic: Correct size of ICSR.VECTPENDING
  hw/intc/armv7m_nvic: ISCR.ISRPENDING is set for non-enabled pending interrupts
  target/arm: Report M-profile alignment faults correctly to the guest
  target/arm: Add missing 'return's after calling v7m_exception_taken()
  target/arm: Enforce that M-profile SP low 2 bits are always zero
  qemu-options.hx: Fix formatting of -machine memory-backend option
  hw/arm/smmuv3: Check 31st bit to see if CD is valid

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index c7a1626bec..c690318a9b 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -559,6 +559,59 @@ static void cpu_arm_set_sve(Object *obj, bool value, Error **errp)
     cpu->isar.id_aa64pfr0 = t;
 }
 
+#ifdef CONFIG_USER_ONLY
+/* Mirror linux /proc/sys/abi/sve_default_vector_length. */
+static void cpu_arm_set_sve_default_vec_len(Object *obj, Visitor *v,
+                                            const char *name, void *opaque,
+                                            Error **errp)
+{
+    ARMCPU *cpu = ARM_CPU(obj);
+    int32_t default_len, default_vq, remainder;
+
+    if (!visit_type_int32(v, name, &default_len, errp)) {
+        return;
+    }
+
+    /* Undocumented, but the kernel allows -1 to indicate "maximum". */
+    if (default_len == -1) {
+        cpu->sve_default_vq = ARM_MAX_VQ;
+        return;
+    }
+
+    default_vq = default_len / 16;
+    remainder = default_len % 16;
+
+    /*
+     * Note that the 512 max comes from include/uapi/asm/sve_context.h
+     * and is the maximum architectural width of ZCR_ELx.LEN.
+     */
+    if (remainder || default_vq < 1 || default_vq > 512) {
+        error_setg(errp, "cannot set sve-default-vector-length");
+        if (remainder) {
+            error_append_hint(errp, "Vector length not a multiple of 16\n");
+        } else if (default_vq < 1) {
+            error_append_hint(errp, "Vector length smaller than 16\n");
+        } else {
+            error_append_hint(errp, "Vector length larger than %d\n",
+                              512 * 16);
+        }
+        return;
+    }
+
+    cpu->sve_default_vq = default_vq;
+}
+
+static void cpu_arm_get_sve_default_vec_len(Object *obj, Visitor *v,
+                                            const char *name, void *opaque,
+                                            Error **errp)
+{
+    ARMCPU *cpu = ARM_CPU(obj);
+    int32_t value = cpu->sve_default_vq * 16;
+
+    visit_type_int32(v, name, &value, errp);
+}
+#endif
+
 void aarch64_add_sve_properties(Object *obj)
 {
     uint32_t vq;
@@ -571,6 +624,13 @@ void aarch64_add_sve_properties(Object *obj)
         object_property_add(obj, name, "bool", cpu_arm_get_sve_vq,
                             cpu_arm_set_sve_vq, NULL, NULL);
     }
+
+#ifdef CONFIG_USER_ONLY
+    /* Mirror linux /proc/sys/abi/sve_default_vector_length. */
+    object_property_add(obj, "sve-default-vector-length", "int32",
+                        cpu_arm_get_sve_default_vec_len,
+                        cpu_arm_set_sve_default_vec_len, NULL, NULL);
+#endif
 }
 
 void arm_cpu_pauth_finalize(ARMCPU *cpu, Error **errp)