add 18th iteration of classifier

1 files changed, 99 insertions, 0 deletions

diff --git a/results/classifier/118/TCG-risc-v/2683 b/results/classifier/118/TCG-risc-v/2683
new file mode 100644
index 000000000..02ccf91ac
--- /dev/null
+++ b/results/classifier/118/TCG-risc-v/2683
@@ -0,0 +1,99 @@
+TCG: 0.991
+risc-v: 0.945
+performance: 0.867
+architecture: 0.854
+ppc: 0.847
+graphic: 0.841
+semantic: 0.795
+PID: 0.759
+device: 0.758
+kernel: 0.737
+i386: 0.728
+mistranslation: 0.728
+user-level: 0.727
+register: 0.727
+network: 0.714
+peripherals: 0.706
+permissions: 0.706
+VMM: 0.702
+vnc: 0.685
+arm: 0.639
+x86: 0.635
+hypervisor: 0.634
+socket: 0.632
+KVM: 0.630
+assembly: 0.629
+debug: 0.602
+files: 0.573
+boot: 0.479
+virtual: 0.432
+--------------------
+TCG: 0.942
+risc-v: 0.533
+kernel: 0.316
+debug: 0.145
+semantic: 0.116
+performance: 0.104
+files: 0.070
+assembly: 0.039
+architecture: 0.025
+register: 0.024
+hypervisor: 0.019
+virtual: 0.014
+user-level: 0.007
+device: 0.005
+PID: 0.004
+boot: 0.004
+VMM: 0.003
+KVM: 0.002
+peripherals: 0.002
+permissions: 0.002
+network: 0.002
+socket: 0.002
+ppc: 0.002
+arm: 0.001
+vnc: 0.001
+x86: 0.001
+mistranslation: 0.001
+graphic: 0.001
+i386: 0.001
+
+TCG: probe_access() has inconsistent behavior
+Description of problem:
+In full-system mode, probe_access() will return NULL when the flag is TLB_MMIO.
+
+accel/tcg/cputlb.c: probe_access_internal()
+```
+    if (unlikely(flags & ~(TLB_WATCHPOINT | TLB_NOTDIRTY | TLB_CHECK_ALIGNED))
+        || (access_type != MMU_INST_FETCH && force_mmio)) {
+        *phost = NULL;
+        return TLB_MMIO;
+    }
+```
+But in linux-user mode, it will return correct address when the flag is TLB_MMIO.
+
+accel/tcg/user-exec.c: probe_access()
+```
+    return size ? g2h(env_cpu(env), addr) : NULL;
+```
+This will lead to some different behaviors, like cbo.zero in RISC-V.
+
+target/riscv/op_helper.c: helper_cbo_zero()
+```
+    mem = probe_write(env, address, cbozlen, mmu_idx, ra);
+
+    if (likely(mem)) {
+        memset(mem, 0, cbozlen);
+    } else {
+        for (int i = 0; i < cbozlen; i++) {
+            cpu_stb_mmuidx_ra(env, address + i, 0, mmu_idx, ra);
+        }
+    }
+```
+When the current instruction has memory callback by plugin:
+
+Full-system mode uses slow-path(cpu_stb_mmuidx_ra) and inject mem_cbs correctly.
+
+Linux-user mode uses fast-path(memset) and doesn't inject callbacks.
+
+To ensure consistent results, probe_access() should return NULL when the flag is TLB_MMIO in linux-user mode.