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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_missing/host_missing/accel_TCG/2683.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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diff --git a/gitlab/issues/target_missing/host_missing/accel_TCG/2683.toml b/gitlab/issues/target_missing/host_missing/accel_TCG/2683.toml
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index dcd11b05..00000000
--- a/gitlab/issues/target_missing/host_missing/accel_TCG/2683.toml
+++ /dev/null
@@ -1,51 +0,0 @@
-id = 2683
-title = "TCG: probe_access() has inconsistent behavior"
-state = "opened"
-created_at = "2024-11-18T12:14:06.455Z"
-closed_at = "n/a"
-labels = ["accel: TCG", "bsd-user", "linux-user"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2683"
-host-os = "n/a"
-host-arch = "n/a"
-qemu-version = "9.1.0"
-guest-os = "n/a"
-guest-arch = "n/a"
-description = """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."""
-reproduce = "n/a"
-additional = "n/a"