Merge remote-tracking branch 'remotes/palmer/tags/riscv-for-master-4.1-sf0' into staging

RISC-V Patches for the 4.1 Soft Freeze, Part 1

This tag contains a handful of patches that I'd like to target for 4.1:

* An emulation for SiFive's GPIO device.
* A fix to disallow sfence.vma from userspace.
* Additional decodetree cleanups that should have no functional impact.
* C extension emulation fidelity fixes that were noticed as part of that
  cleanup process.
* A new "spike" target, along with the deprecation of a handful of old
  targets and CPUs.
* Some initial infastructure related to the hypervisor extension.
* An emulation fidelity fix that prevents prevents arbitrary bits in the
  SIP CSR from being set.
* A small performance improvement that avoids excessive TLB flushing
  when the ASID does not change.

This time I've used a new testing workflow: I've tested on both 32-bit
and 64-bit builds of OpenEmbedded, via the default OpenSBI-based boot
flow.

# gpg: Signature made Sat 25 May 2019 01:05:57 BST
# gpg:                using RSA key 00CE76D1834960DFCE886DF8EF4CA1502CCBAB41
# gpg:                issuer "palmer@dabbelt.com"
# gpg: Good signature from "Palmer Dabbelt <palmer@dabbelt.com>" [unknown]
# gpg:                 aka "Palmer Dabbelt <palmer@sifive.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 00CE 76D1 8349 60DF CE88  6DF8 EF4C A150 2CCB AB41

* remotes/palmer/tags/riscv-for-master-4.1-sf0: (29 commits)
  target/riscv: Only flush TLB if SATP.ASID changes
  target/riscv: More accurate handling of `sip` CSR
  target/riscv: Add checks for several RVC reserved operands
  target/riscv: Add the HGATP register masks
  target/riscv: Add the HSTATUS register masks
  target/riscv: Add Hypervisor CSR macros
  target/riscv: Allow setting mstatus virtulisation bits
  target/riscv: Add the MPV and MTL mstatus bits
  target/riscv: Improve the scause logic
  target/riscv: Trigger interrupt on MIP update asynchronously
  target/riscv: Mark privilege level 2 as reserved
  riscv: spike: Add a generic spike machine
  target/riscv: Deprecate the generic no MMU CPUs
  target/riscv: Add a base 32 and 64 bit CPU
  target/riscv: Create settable CPU properties
  riscv: virt: Allow specifying a CPU via commandline
  linux-user/riscv: Add the CPU type as a comment
  target/riscv: Remove unused include of riscv_htif.h for virt board riscv
  target/riscv: Remove spaces from register names
  target/riscv: Split gen_arith_imm into functional and temp
  ...

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

1 files changed, 71 insertions, 8 deletions

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index b7675707e0..e29879915f 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -23,6 +23,7 @@
 #include "cpu.h"
 #include "exec/exec-all.h"
 #include "qapi/error.h"
+#include "hw/qdev-properties.h"
 #include "migration/vmstate.h"
 
 /* RISC-V CPU definitions */
@@ -30,17 +31,17 @@
 static const char riscv_exts[26] = "IEMAFDQCLBJTPVNSUHKORWXYZG";
 
 const char * const riscv_int_regnames[] = {
-  "zero", "ra  ", "sp  ", "gp  ", "tp  ", "t0  ", "t1  ", "t2  ",
-  "s0  ", "s1  ", "a0  ", "a1  ", "a2  ", "a3  ", "a4  ", "a5  ",
-  "a6  ", "a7  ", "s2  ", "s3  ", "s4  ", "s5  ", "s6  ", "s7  ",
-  "s8  ", "s9  ", "s10 ", "s11 ", "t3  ", "t4  ", "t5  ", "t6  "
+  "zero", "ra", "sp",  "gp",  "tp", "t0", "t1", "t2",
+  "s0",   "s1", "a0",  "a1",  "a2", "a3", "a4", "a5",
+  "a6",   "a7", "s2",  "s3",  "s4", "s5", "s6", "s7",
+  "s8",   "s9", "s10", "s11", "t3", "t4", "t5", "t6"
 };
 
 const char * const riscv_fpr_regnames[] = {
-  "ft0 ", "ft1 ", "ft2 ", "ft3 ", "ft4 ", "ft5 ", "ft6 ",  "ft7 ",
-  "fs0 ", "fs1 ", "fa0 ", "fa1 ", "fa2 ", "fa3 ", "fa4 ",  "fa5 ",
-  "fa6 ", "fa7 ", "fs2 ", "fs3 ", "fs4 ", "fs5 ", "fs6 ",  "fs7 ",
-  "fs8 ", "fs9 ", "fs10", "fs11", "ft8 ", "ft9 ", "ft10",  "ft11"
+  "ft0", "ft1", "ft2",  "ft3",  "ft4", "ft5", "ft6",  "ft7",
+  "fs0", "fs1", "fa0",  "fa1",  "fa2", "fa3", "fa4",  "fa5",
+  "fa6", "fa7", "fs2",  "fs3",  "fs4", "fs5", "fs6",  "fs7",
+  "fs8", "fs9", "fs10", "fs11", "ft8", "ft9", "ft10", "ft11"
 };
 
 const char * const riscv_excp_names[] = {
@@ -114,6 +115,12 @@ static void riscv_any_cpu_init(Object *obj)
 
 #if defined(TARGET_RISCV32)
 
+static void riscv_base32_cpu_init(Object *obj)
+{
+    CPURISCVState *env = &RISCV_CPU(obj)->env;
+    set_misa(env, RV32 | RVI | RVM | RVA | RVF | RVD | RVC | RVS | RVU);
+}
+
 static void rv32gcsu_priv1_09_1_cpu_init(Object *obj)
 {
     CPURISCVState *env = &RISCV_CPU(obj)->env;
@@ -145,6 +152,12 @@ static void rv32imacu_nommu_cpu_init(Object *obj)
 
 #elif defined(TARGET_RISCV64)
 
+static void riscv_base64_cpu_init(Object *obj)
+{
+    CPURISCVState *env = &RISCV_CPU(obj)->env;
+    set_misa(env, RV64 | RVI | RVM | RVA | RVF | RVD | RVC | RVS | RVU);
+}
+
 static void rv64gcsu_priv1_09_1_cpu_init(Object *obj)
 {
     CPURISCVState *env = &RISCV_CPU(obj)->env;
@@ -296,7 +309,11 @@ static void riscv_cpu_disas_set_info(CPUState *s, disassemble_info *info)
 static void riscv_cpu_realize(DeviceState *dev, Error **errp)
 {
     CPUState *cs = CPU(dev);
+    RISCVCPU *cpu = RISCV_CPU(dev);
+    CPURISCVState *env = &cpu->env;
     RISCVCPUClass *mcc = RISCV_CPU_GET_CLASS(dev);
+    int priv_version = PRIV_VERSION_1_10_0;
+    int user_version = USER_VERSION_2_02_0;
     Error *local_err = NULL;
 
     cpu_exec_realizefn(cs, &local_err);
@@ -305,6 +322,41 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    if (cpu->cfg.priv_spec) {
+        if (!g_strcmp0(cpu->cfg.priv_spec, "v1.10.0")) {
+            priv_version = PRIV_VERSION_1_10_0;
+        } else if (!g_strcmp0(cpu->cfg.priv_spec, "v1.9.1")) {
+            priv_version = PRIV_VERSION_1_09_1;
+        } else {
+            error_setg(errp,
+                       "Unsupported privilege spec version '%s'",
+                       cpu->cfg.priv_spec);
+            return;
+        }
+    }
+
+    if (cpu->cfg.user_spec) {
+        if (!g_strcmp0(cpu->cfg.user_spec, "v2.02.0")) {
+            user_version = USER_VERSION_2_02_0;
+        } else {
+            error_setg(errp,
+                       "Unsupported user spec version '%s'",
+                       cpu->cfg.user_spec);
+            return;
+        }
+    }
+
+    set_versions(env, user_version, priv_version);
+    set_resetvec(env, DEFAULT_RSTVEC);
+
+    if (cpu->cfg.mmu) {
+        set_feature(env, RISCV_FEATURE_MMU);
+    }
+
+    if (cpu->cfg.pmp) {
+        set_feature(env, RISCV_FEATURE_PMP);
+    }
+
     riscv_cpu_register_gdb_regs_for_features(cs);
 
     qemu_init_vcpu(cs);
@@ -326,6 +378,14 @@ static const VMStateDescription vmstate_riscv_cpu = {
     .unmigratable = 1,
 };
 
+static Property riscv_cpu_properties[] = {
+    DEFINE_PROP_STRING("priv_spec", RISCVCPU, cfg.priv_spec),
+    DEFINE_PROP_STRING("user_spec", RISCVCPU, cfg.user_spec),
+    DEFINE_PROP_BOOL("mmu", RISCVCPU, cfg.mmu, true),
+    DEFINE_PROP_BOOL("pmp", RISCVCPU, cfg.pmp, true),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void riscv_cpu_class_init(ObjectClass *c, void *data)
 {
     RISCVCPUClass *mcc = RISCV_CPU_CLASS(c);
@@ -365,6 +425,7 @@ static void riscv_cpu_class_init(ObjectClass *c, void *data)
 #endif
     /* For now, mark unmigratable: */
     cc->vmsd = &vmstate_riscv_cpu;
+    dc->props = riscv_cpu_properties;
 }
 
 char *riscv_isa_string(RISCVCPU *cpu)
@@ -430,12 +491,14 @@ static const TypeInfo riscv_cpu_type_infos[] = {
     },
     DEFINE_CPU(TYPE_RISCV_CPU_ANY,              riscv_any_cpu_init),
 #if defined(TARGET_RISCV32)
+    DEFINE_CPU(TYPE_RISCV_CPU_BASE32,           riscv_base32_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_RV32GCSU_V1_09_1, rv32gcsu_priv1_09_1_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_RV32GCSU_V1_10_0, rv32gcsu_priv1_10_0_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_RV32IMACU_NOMMU,  rv32imacu_nommu_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_E31,       rv32imacu_nommu_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_U34,       rv32gcsu_priv1_10_0_cpu_init)
 #elif defined(TARGET_RISCV64)
+    DEFINE_CPU(TYPE_RISCV_CPU_BASE64,           riscv_base64_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_RV64GCSU_V1_09_1, rv64gcsu_priv1_09_1_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_RV64GCSU_V1_10_0, rv64gcsu_priv1_10_0_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_RV64IMACU_NOMMU,  rv64imacu_nommu_cpu_init),