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plugins: conditional callbacks

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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.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20240502211522.346467-6-pierrick.bouvier@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
[AJB: fix re-base conflict with tb_is_mem_only()]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240514174253.694591-8-alex.bennee@linaro.org>
This commit is contained in:
Pierrick Bouvier 2024-05-14 18:42:49 +01:00 • committed by Alex Bennée
parent a1c9bf2514
commit 7de77d3788
7 changed files with 213 additions and 0 deletions
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76
include/qemu/qemu-plugin.h
View file

@ -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