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[PATCH v3 5/8] plugins: conditional callbacks
|
From: |
Pierrick Bouvier |
|
Subject: |
[PATCH v3 5/8] plugins: conditional callbacks |
|
Date: |
Mon, 25 Mar 2024 16:41:48 +0400 |
Extend plugins API to support callback called with a given criteria
(evaluated inline).
Added functions:
- qemu_plugin_register_vcpu_tb_exec_cond_cb
- qemu_plugin_register_vcpu_insn_exec_cond_cb
They expect as parameter a condition, a qemu_plugin_u64_t (op1) and an
immediate (op2). Callback is called if op1 |cond| op2 is true.
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
include/qemu/plugin.h | 8 ++++
include/qemu/qemu-plugin.h | 76 ++++++++++++++++++++++++++++++++++++
plugins/plugin.h | 8 ++++
accel/tcg/plugin-gen.c | 48 +++++++++++++++++++++++
plugins/api.c | 39 ++++++++++++++++++
plugins/core.c | 32 +++++++++++++++
plugins/qemu-plugins.symbols | 2 +
7 files changed, 213 insertions(+)
diff --git a/include/qemu/plugin.h b/include/qemu/plugin.h
index d1d9b4490df..bb224b8e4c7 100644
--- a/include/qemu/plugin.h
+++ b/include/qemu/plugin.h
@@ -67,6 +67,7 @@ union qemu_plugin_cb_sig {
enum plugin_dyn_cb_type {
PLUGIN_CB_REGULAR,
+ PLUGIN_CB_COND,
PLUGIN_CB_MEM_REGULAR,
PLUGIN_CB_INLINE_ADD_U64,
PLUGIN_CB_INLINE_STORE_U64,
@@ -88,6 +89,13 @@ struct qemu_plugin_dyn_cb {
union qemu_plugin_cb_sig f;
TCGHelperInfo *info;
} regular;
+ struct {
+ union qemu_plugin_cb_sig f;
+ TCGHelperInfo *info;
+ qemu_plugin_u64 entry;
+ enum qemu_plugin_cond cond;
+ uint64_t imm;
+ } cond;
struct {
qemu_plugin_u64 entry;
enum qemu_plugin_op op;
diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h
index c5cac897a0b..337de25ece7 100644
--- a/include/qemu/qemu-plugin.h
+++ b/include/qemu/qemu-plugin.h
@@ -262,6 +262,29 @@ enum qemu_plugin_mem_rw {
QEMU_PLUGIN_MEM_RW,
};
+/**
+ * enum qemu_plugin_cond - condition to enable callback
+ *
+ * @QEMU_PLUGIN_COND_NEVER: false
+ * @QEMU_PLUGIN_COND_ALWAYS: true
+ * @QEMU_PLUGIN_COND_EQ: is equal?
+ * @QEMU_PLUGIN_COND_NE: is not equal?
+ * @QEMU_PLUGIN_COND_LT: is less than?
+ * @QEMU_PLUGIN_COND_LE: is less than or equal?
+ * @QEMU_PLUGIN_COND_GT: is greater than?
+ * @QEMU_PLUGIN_COND_GE: is greater than or equal?
+ */
+enum qemu_plugin_cond {
+ QEMU_PLUGIN_COND_NEVER,
+ QEMU_PLUGIN_COND_ALWAYS,
+ QEMU_PLUGIN_COND_EQ,
+ QEMU_PLUGIN_COND_NE,
+ QEMU_PLUGIN_COND_LT,
+ QEMU_PLUGIN_COND_LE,
+ QEMU_PLUGIN_COND_GT,
+ QEMU_PLUGIN_COND_GE,
+};
+
/**
* typedef qemu_plugin_vcpu_tb_trans_cb_t - translation callback
* @id: unique plugin id
@@ -301,6 +324,32 @@ void qemu_plugin_register_vcpu_tb_exec_cb(struct
qemu_plugin_tb *tb,
enum qemu_plugin_cb_flags flags,
void *userdata);
+/**
+ * qemu_plugin_register_vcpu_tb_exec_cond_cb() - register conditional callback
+ * @tb: the opaque qemu_plugin_tb handle for the translation
+ * @cb: callback function
+ * @cond: condition to enable callback
+ * @entry: first operand for condition
+ * @imm: second operand for condition
+ * @flags: does the plugin read or write the CPU's registers?
+ * @userdata: any plugin data to pass to the @cb?
+ *
+ * The @cb function is called when a translated unit executes if
+ * entry @cond imm is true.
+ * If condition is QEMU_PLUGIN_COND_ALWAYS, condition is never interpreted and
+ * this function is equivalent to qemu_plugin_register_vcpu_tb_exec_cb.
+ * If condition QEMU_PLUGIN_COND_NEVER, condition is never interpreted and
+ * callback is never installed.
+ */
+QEMU_PLUGIN_API
+void qemu_plugin_register_vcpu_tb_exec_cond_cb(struct qemu_plugin_tb *tb,
+ qemu_plugin_vcpu_udata_cb_t cb,
+ enum qemu_plugin_cb_flags flags,
+ enum qemu_plugin_cond cond,
+ qemu_plugin_u64 entry,
+ uint64_t imm,
+ void *userdata);
+
/**
* enum qemu_plugin_op - describes an inline op
*
@@ -344,6 +393,33 @@ void qemu_plugin_register_vcpu_insn_exec_cb(struct
qemu_plugin_insn *insn,
enum qemu_plugin_cb_flags flags,
void *userdata);
+/**
+ * qemu_plugin_register_vcpu_insn_exec_cond_cb() - conditional insn execution
cb
+ * @insn: the opaque qemu_plugin_insn handle for an instruction
+ * @cb: callback function
+ * @flags: does the plugin read or write the CPU's registers?
+ * @cond: condition to enable callback
+ * @entry: first operand for condition
+ * @imm: second operand for condition
+ * @userdata: any plugin data to pass to the @cb?
+ *
+ * The @cb function is called when an instruction executes if
+ * entry @cond imm is true.
+ * If condition is QEMU_PLUGIN_COND_ALWAYS, condition is never interpreted and
+ * this function is equivalent to qemu_plugin_register_vcpu_insn_exec_cb.
+ * If condition QEMU_PLUGIN_COND_NEVER, condition is never interpreted and
+ * callback is never installed.
+ */
+QEMU_PLUGIN_API
+void qemu_plugin_register_vcpu_insn_exec_cond_cb(
+ struct qemu_plugin_insn *insn,
+ qemu_plugin_vcpu_udata_cb_t cb,
+ enum qemu_plugin_cb_flags flags,
+ enum qemu_plugin_cond cond,
+ qemu_plugin_u64 entry,
+ uint64_t imm,
+ void *userdata);
+
/**
* qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu() - insn exec inline op
* @insn: the opaque qemu_plugin_insn handle for an instruction
diff --git a/plugins/plugin.h b/plugins/plugin.h
index 7c34f23cfcb..7d4b4e21f7c 100644
--- a/plugins/plugin.h
+++ b/plugins/plugin.h
@@ -93,6 +93,14 @@ plugin_register_dyn_cb__udata(GArray **arr,
qemu_plugin_vcpu_udata_cb_t cb,
enum qemu_plugin_cb_flags flags, void *udata);
+void
+plugin_register_dyn_cond_cb__udata(GArray **arr,
+ qemu_plugin_vcpu_udata_cb_t cb,
+ enum qemu_plugin_cb_flags flags,
+ enum qemu_plugin_cond cond,
+ qemu_plugin_u64 entry,
+ uint64_t imm,
+ void *udata);
void plugin_register_vcpu_mem_cb(GArray **arr,
void *cb,
diff --git a/accel/tcg/plugin-gen.c b/accel/tcg/plugin-gen.c
index 45856a75cda..7ecaf670d93 100644
--- a/accel/tcg/plugin-gen.c
+++ b/accel/tcg/plugin-gen.c
@@ -139,6 +139,51 @@ static TCGv_ptr gen_plugin_u64_ptr(qemu_plugin_u64 entry)
return ptr;
}
+static TCGCond plugin_cond_to_tcgcond(enum qemu_plugin_cond cond)
+{
+ switch (cond) {
+ case QEMU_PLUGIN_COND_EQ:
+ return TCG_COND_EQ;
+ case QEMU_PLUGIN_COND_NE:
+ return TCG_COND_NE;
+ case QEMU_PLUGIN_COND_LT:
+ return TCG_COND_LTU;
+ case QEMU_PLUGIN_COND_LE:
+ return TCG_COND_LEU;
+ case QEMU_PLUGIN_COND_GT:
+ return TCG_COND_GTU;
+ case QEMU_PLUGIN_COND_GE:
+ return TCG_COND_GEU;
+ default:
+ /* ALWAYS and NEVER conditions should never reach */
+ g_assert_not_reached();
+ }
+}
+
+static void gen_udata_cond_cb(struct qemu_plugin_dyn_cb *cb)
+{
+ TCGv_ptr ptr = gen_plugin_u64_ptr(cb->cond.entry);
+ TCGv_i32 cpu_index = tcg_temp_ebb_new_i32();
+ TCGv_i64 val = tcg_temp_ebb_new_i64();
+ TCGLabel *after_cb = gen_new_label();
+
+ /* Condition should be negated, as calling the cb is the "else" path */
+ TCGCond cond = tcg_invert_cond(plugin_cond_to_tcgcond(cb->cond.cond));
+
+ tcg_gen_ld_i64(val, ptr, 0);
+ tcg_gen_brcondi_i64(cond, val, cb->cond.imm, after_cb);
+ tcg_gen_ld_i32(cpu_index, tcg_env,
+ -offsetof(ArchCPU, env) + offsetof(CPUState, cpu_index));
+ tcg_gen_call2(cb->cond.f.vcpu_udata, cb->cond.info, NULL,
+ tcgv_i32_temp(cpu_index),
+ tcgv_ptr_temp(tcg_constant_ptr(cb->userp)));
+ gen_set_label(after_cb);
+
+ tcg_temp_free_i64(val);
+ tcg_temp_free_i32(cpu_index);
+ tcg_temp_free_ptr(ptr);
+}
+
static void gen_inline_add_u64_cb(struct qemu_plugin_dyn_cb *cb)
{
TCGv_ptr ptr = gen_plugin_u64_ptr(cb->inline_insn.entry);
@@ -186,6 +231,9 @@ static void inject_cb(struct qemu_plugin_dyn_cb *cb)
case PLUGIN_CB_REGULAR:
gen_udata_cb(cb);
break;
+ case PLUGIN_CB_COND:
+ gen_udata_cond_cb(cb);
+ break;
case PLUGIN_CB_INLINE_ADD_U64:
gen_inline_add_u64_cb(cb);
break;
diff --git a/plugins/api.c b/plugins/api.c
index 3912c9cc8f6..2242d40bbbc 100644
--- a/plugins/api.c
+++ b/plugins/api.c
@@ -96,6 +96,25 @@ void qemu_plugin_register_vcpu_tb_exec_cb(struct
qemu_plugin_tb *tb,
}
}
+void qemu_plugin_register_vcpu_tb_exec_cond_cb(struct qemu_plugin_tb *tb,
+ qemu_plugin_vcpu_udata_cb_t cb,
+ enum qemu_plugin_cb_flags flags,
+ enum qemu_plugin_cond cond,
+ qemu_plugin_u64 entry,
+ uint64_t imm,
+ void *udata)
+{
+ if (cond == QEMU_PLUGIN_COND_NEVER || tb->mem_only) {
+ return;
+ }
+ if (cond == QEMU_PLUGIN_COND_ALWAYS) {
+ qemu_plugin_register_vcpu_tb_exec_cb(tb, cb, flags, udata);
+ return;
+ }
+ plugin_register_dyn_cond_cb__udata(&tb->cbs, cb, flags,
+ cond, entry, imm, udata);
+}
+
void qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu(
struct qemu_plugin_tb *tb,
enum qemu_plugin_op op,
@@ -117,6 +136,26 @@ void qemu_plugin_register_vcpu_insn_exec_cb(struct
qemu_plugin_insn *insn,
}
}
+void qemu_plugin_register_vcpu_insn_exec_cond_cb(
+ struct qemu_plugin_insn *insn,
+ qemu_plugin_vcpu_udata_cb_t cb,
+ enum qemu_plugin_cb_flags flags,
+ enum qemu_plugin_cond cond,
+ qemu_plugin_u64 entry,
+ uint64_t imm,
+ void *udata)
+{
+ if (cond == QEMU_PLUGIN_COND_NEVER || insn->mem_only) {
+ return;
+ }
+ if (cond == QEMU_PLUGIN_COND_ALWAYS) {
+ qemu_plugin_register_vcpu_insn_exec_cb(insn, cb, flags, udata);
+ return;
+ }
+ plugin_register_dyn_cond_cb__udata(&insn->insn_cbs, cb, flags,
+ cond, entry, imm, udata);
+}
+
void qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu(
struct qemu_plugin_insn *insn,
enum qemu_plugin_op op,
diff --git a/plugins/core.c b/plugins/core.c
index e1bf0dc3717..b3d0208e022 100644
--- a/plugins/core.c
+++ b/plugins/core.c
@@ -371,6 +371,38 @@ void plugin_register_dyn_cb__udata(GArray **arr,
dyn_cb->regular.info = &info[flags];
}
+void plugin_register_dyn_cond_cb__udata(GArray **arr,
+ qemu_plugin_vcpu_udata_cb_t cb,
+ enum qemu_plugin_cb_flags flags,
+ enum qemu_plugin_cond cond,
+ qemu_plugin_u64 entry,
+ uint64_t imm,
+ void *udata)
+{
+ static TCGHelperInfo info[3] = {
+ [QEMU_PLUGIN_CB_NO_REGS].flags = TCG_CALL_NO_RWG,
+ [QEMU_PLUGIN_CB_R_REGS].flags = TCG_CALL_NO_WG,
+ /*
+ * Match qemu_plugin_vcpu_udata_cb_t:
+ * void (*)(uint32_t, void *)
+ */
+ [0 ... 2].typemask = (dh_typemask(void, 0) |
+ dh_typemask(i32, 1) |
+ dh_typemask(ptr, 2))
+ };
+
+ struct qemu_plugin_dyn_cb *dyn_cb = plugin_get_dyn_cb(arr);
+ dyn_cb->userp = udata;
+ dyn_cb->type = PLUGIN_CB_COND;
+ dyn_cb->cond.f.vcpu_udata = cb;
+ dyn_cb->cond.cond = cond;
+ dyn_cb->cond.entry = entry;
+ dyn_cb->cond.imm = imm;
+
+ assert((unsigned)flags < ARRAY_SIZE(info));
+ dyn_cb->cond.info = &info[flags];
+}
+
void plugin_register_vcpu_mem_cb(GArray **arr,
void *cb,
enum qemu_plugin_cb_flags flags,
diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols
index a9fac056c7f..aa0a77a319f 100644
--- a/plugins/qemu-plugins.symbols
+++ b/plugins/qemu-plugins.symbols
@@ -27,6 +27,7 @@
qemu_plugin_register_vcpu_idle_cb;
qemu_plugin_register_vcpu_init_cb;
qemu_plugin_register_vcpu_insn_exec_cb;
+ qemu_plugin_register_vcpu_insn_exec_cond_cb;
qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu;
qemu_plugin_register_vcpu_mem_cb;
qemu_plugin_register_vcpu_mem_inline_per_vcpu;
@@ -34,6 +35,7 @@
qemu_plugin_register_vcpu_syscall_cb;
qemu_plugin_register_vcpu_syscall_ret_cb;
qemu_plugin_register_vcpu_tb_exec_cb;
+ qemu_plugin_register_vcpu_tb_exec_cond_cb;
qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu;
qemu_plugin_register_vcpu_tb_trans_cb;
qemu_plugin_reset;
--
2.39.2
- [PATCH v3 2/8] plugins: extract generate ptr for qemu_plugin_u64, (continued)
- [PATCH v3 2/8] plugins: extract generate ptr for qemu_plugin_u64, Pierrick Bouvier, 2024/03/25
- [PATCH v3 4/8] tests/plugin/inline: add test for STORE_U64 inline op, Pierrick Bouvier, 2024/03/25
- [PATCH v3 3/8] plugins: add new inline op STORE_U64, Pierrick Bouvier, 2024/03/25
- [PATCH v3 6/8] tests/plugin/inline: add test for conditional callback, Pierrick Bouvier, 2024/03/25
- [PATCH v3 7/8] plugins: distinct types for callbacks, Pierrick Bouvier, 2024/03/25
- [PATCH v3 5/8] plugins: conditional callbacks,
Pierrick Bouvier <=
- [PATCH v3 8/8] plugins: extract cpu_index generate, Pierrick Bouvier, 2024/03/25