diff options
Diffstat (limited to 'include/qemu/qemu-plugin.h')
| -rw-r--r-- | include/qemu/qemu-plugin.h | 232 |
1 files changed, 188 insertions, 44 deletions
diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index c66507fe8f..97cdfd7761 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -32,6 +32,9 @@ #define QEMU_PLUGIN_LOCAL __attribute__((visibility("hidden"))) #endif +/** + * typedef qemu_plugin_id_t - Unique plugin ID + */ typedef uint64_t qemu_plugin_id_t; /* @@ -47,24 +50,32 @@ typedef uint64_t qemu_plugin_id_t; extern QEMU_PLUGIN_EXPORT int qemu_plugin_version; -#define QEMU_PLUGIN_VERSION 0 +#define QEMU_PLUGIN_VERSION 1 -typedef struct { - /* string describing architecture */ +/** + * struct qemu_info_t - system information for plugins + * + * This structure provides for some limited information about the + * system to allow the plugin to make decisions on how to proceed. For + * example it might only be suitable for running on some guest + * architectures or when under full system emulation. + */ +typedef struct qemu_info_t { + /** @target_name: string describing architecture */ const char *target_name; + /** @version: minimum and current plugin API level */ struct { int min; int cur; } version; - /* is this a full system emulation? */ + /** @system_emulation: is this a full system emulation? */ bool system_emulation; union { - /* - * smp_vcpus may change if vCPUs can be hot-plugged, max_vcpus - * is the system-wide limit. - */ + /** @system: information relevant to system emulation */ struct { + /** @system.smp_vcpus: initial number of vCPUs */ int smp_vcpus; + /** @system.max_vcpus: maximum possible number of vCPUs */ int max_vcpus; } system; }; @@ -77,31 +88,50 @@ typedef struct { * @argc: number of arguments * @argv: array of arguments (@argc elements) * - * All plugins must export this symbol. - * - * Note: Calling qemu_plugin_uninstall() from this function is a bug. To raise - * an error during install, return !0. + * All plugins must export this symbol which is called when the plugin + * is first loaded. Calling qemu_plugin_uninstall() from this function + * is a bug. * * Note: @info is only live during the call. Copy any information we - * want to keep. + * want to keep. @argv remains valid throughout the lifetime of the + * loaded plugin. * - * Note: @argv remains valid throughout the lifetime of the loaded plugin. + * Return: 0 on successful loading, !0 for an error. */ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info, int argc, char **argv); -/* - * Prototypes for the various callback styles we will be registering - * in the following functions. +/** + * typedef qemu_plugin_simple_cb_t - simple callback + * @id: the unique qemu_plugin_id_t + * + * This callback passes no information aside from the unique @id. */ typedef void (*qemu_plugin_simple_cb_t)(qemu_plugin_id_t id); +/** + * typedef qemu_plugin_udata_cb_t - callback with user data + * @id: the unique qemu_plugin_id_t + * @userdata: a pointer to some user data supplied when the callback + * was registered. + */ typedef void (*qemu_plugin_udata_cb_t)(qemu_plugin_id_t id, void *userdata); +/** + * typedef qemu_plugin_vcpu_simple_cb_t - vcpu callback + * @id: the unique qemu_plugin_id_t + * @vcpu_index: the current vcpu context + */ typedef void (*qemu_plugin_vcpu_simple_cb_t)(qemu_plugin_id_t id, unsigned int vcpu_index); +/** + * typedef qemu_plugin_vcpu_udata_cb_t - vcpu callback + * @vcpu_index: the current vcpu context + * @userdata: a pointer to some user data supplied when the callback + * was registered. + */ typedef void (*qemu_plugin_vcpu_udata_cb_t)(unsigned int vcpu_index, void *userdata); @@ -175,17 +205,25 @@ void qemu_plugin_register_vcpu_idle_cb(qemu_plugin_id_t id, void qemu_plugin_register_vcpu_resume_cb(qemu_plugin_id_t id, qemu_plugin_vcpu_simple_cb_t cb); -/* - * Opaque types that the plugin is given during the translation and - * instrumentation phase. - */ +/** struct qemu_plugin_tb - Opaque handle for a translation block */ struct qemu_plugin_tb; +/** struct qemu_plugin_insn - Opaque handle for a translated instruction */ struct qemu_plugin_insn; +/** + * enum qemu_plugin_cb_flags - type of callback + * + * @QEMU_PLUGIN_CB_NO_REGS: callback does not access the CPU's regs + * @QEMU_PLUGIN_CB_R_REGS: callback reads the CPU's regs + * @QEMU_PLUGIN_CB_RW_REGS: callback reads and writes the CPU's regs + * + * Note: currently unused, plugins cannot read or change system + * register state. + */ enum qemu_plugin_cb_flags { - QEMU_PLUGIN_CB_NO_REGS, /* callback does not access the CPU's regs */ - QEMU_PLUGIN_CB_R_REGS, /* callback reads the CPU's regs */ - QEMU_PLUGIN_CB_RW_REGS, /* callback reads and writes the CPU's regs */ + QEMU_PLUGIN_CB_NO_REGS, + QEMU_PLUGIN_CB_R_REGS, + QEMU_PLUGIN_CB_RW_REGS, }; enum qemu_plugin_mem_rw { @@ -195,6 +233,14 @@ enum qemu_plugin_mem_rw { }; /** + * typedef qemu_plugin_vcpu_tb_trans_cb_t - translation callback + * @id: unique plugin id + * @tb: opaque handle used for querying and instrumenting a block. + */ +typedef void (*qemu_plugin_vcpu_tb_trans_cb_t)(qemu_plugin_id_t id, + struct qemu_plugin_tb *tb); + +/** * qemu_plugin_register_vcpu_tb_trans_cb() - register a translate cb * @id: plugin ID * @cb: callback function @@ -206,14 +252,11 @@ enum qemu_plugin_mem_rw { * callbacks to be triggered when the block or individual instruction * executes. */ -typedef void (*qemu_plugin_vcpu_tb_trans_cb_t)(qemu_plugin_id_t id, - struct qemu_plugin_tb *tb); - void qemu_plugin_register_vcpu_tb_trans_cb(qemu_plugin_id_t id, qemu_plugin_vcpu_tb_trans_cb_t cb); /** - * qemu_plugin_register_vcpu_tb_trans_exec_cb() - register execution callback + * qemu_plugin_register_vcpu_tb_exec_cb() - register execution callback * @tb: the opaque qemu_plugin_tb handle for the translation * @cb: callback function * @flags: does the plugin read or write the CPU's registers? @@ -226,12 +269,20 @@ void qemu_plugin_register_vcpu_tb_exec_cb(struct qemu_plugin_tb *tb, enum qemu_plugin_cb_flags flags, void *userdata); +/** + * enum qemu_plugin_op - describes an inline op + * + * @QEMU_PLUGIN_INLINE_ADD_U64: add an immediate value uint64_t + * + * Note: currently only a single inline op is supported. + */ + enum qemu_plugin_op { QEMU_PLUGIN_INLINE_ADD_U64, }; /** - * qemu_plugin_register_vcpu_tb_trans_exec_inline() - execution inline op + * qemu_plugin_register_vcpu_tb_exec_inline() - execution inline op * @tb: the opaque qemu_plugin_tb handle for the translation * @op: the type of qemu_plugin_op (e.g. ADD_U64) * @ptr: the target memory location for the op @@ -240,6 +291,9 @@ enum qemu_plugin_op { * Insert an inline op to every time a translated unit executes. * Useful if you just want to increment a single counter somewhere in * memory. + * + * Note: ops are not atomic so in multi-threaded/multi-smp situations + * you will get inexact results. */ void qemu_plugin_register_vcpu_tb_exec_inline(struct qemu_plugin_tb *tb, enum qemu_plugin_op op, @@ -262,7 +316,6 @@ void qemu_plugin_register_vcpu_insn_exec_cb(struct qemu_plugin_insn *insn, /** * qemu_plugin_register_vcpu_insn_exec_inline() - insn execution inline op * @insn: the opaque qemu_plugin_insn handle for an instruction - * @cb: callback function * @op: the type of qemu_plugin_op (e.g. ADD_U64) * @ptr: the target memory location for the op * @imm: the op data (e.g. 1) @@ -274,41 +327,114 @@ void qemu_plugin_register_vcpu_insn_exec_inline(struct qemu_plugin_insn *insn, enum qemu_plugin_op op, void *ptr, uint64_t imm); -/* - * Helpers to query information about the instructions in a block +/** + * qemu_plugin_tb_n_insns() - query helper for number of insns in TB + * @tb: opaque handle to TB passed to callback + * + * Returns: number of instructions in this block */ size_t qemu_plugin_tb_n_insns(const struct qemu_plugin_tb *tb); +/** + * qemu_plugin_tb_vaddr() - query helper for vaddr of TB start + * @tb: opaque handle to TB passed to callback + * + * Returns: virtual address of block start + */ uint64_t qemu_plugin_tb_vaddr(const struct qemu_plugin_tb *tb); +/** + * qemu_plugin_tb_get_insn() - retrieve handle for instruction + * @tb: opaque handle to TB passed to callback + * @idx: instruction number, 0 indexed + * + * The returned handle can be used in follow up helper queries as well + * as when instrumenting an instruction. It is only valid for the + * lifetime of the callback. + * + * Returns: opaque handle to instruction + */ struct qemu_plugin_insn * qemu_plugin_tb_get_insn(const struct qemu_plugin_tb *tb, size_t idx); +/** + * qemu_plugin_insn_data() - return ptr to instruction data + * @insn: opaque instruction handle from qemu_plugin_tb_get_insn() + * + * Note: data is only valid for duration of callback. See + * qemu_plugin_insn_size() to calculate size of stream. + * + * Returns: pointer to a stream of bytes containing the value of this + * instructions opcode. + */ const void *qemu_plugin_insn_data(const struct qemu_plugin_insn *insn); +/** + * qemu_plugin_insn_size() - return size of instruction + * @insn: opaque instruction handle from qemu_plugin_tb_get_insn() + * + * Returns: size of instruction in bytes + */ size_t qemu_plugin_insn_size(const struct qemu_plugin_insn *insn); +/** + * qemu_plugin_insn_vaddr() - return vaddr of instruction + * @insn: opaque instruction handle from qemu_plugin_tb_get_insn() + * + * Returns: virtual address of instruction + */ uint64_t qemu_plugin_insn_vaddr(const struct qemu_plugin_insn *insn); + +/** + * qemu_plugin_insn_haddr() - return hardware addr of instruction + * @insn: opaque instruction handle from qemu_plugin_tb_get_insn() + * + * Returns: hardware (physical) target address of instruction + */ void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn); -/* - * Memory Instrumentation +/** + * typedef qemu_plugin_meminfo_t - opaque memory transaction handle * - * The anonymous qemu_plugin_meminfo_t and qemu_plugin_hwaddr types - * can be used in queries to QEMU to get more information about a - * given memory access. + * This can be further queried using the qemu_plugin_mem_* query + * functions. */ typedef uint32_t qemu_plugin_meminfo_t; +/** struct qemu_plugin_hwaddr - opaque hw address handle */ struct qemu_plugin_hwaddr; -/* meminfo queries */ +/** + * qemu_plugin_mem_size_shift() - get size of access + * @info: opaque memory transaction handle + * + * Returns: size of access in ^2 (0=byte, 1=16bit, 2=32bit etc...) + */ unsigned int qemu_plugin_mem_size_shift(qemu_plugin_meminfo_t info); +/** + * qemu_plugin_mem_is_sign_extended() - was the access sign extended + * @info: opaque memory transaction handle + * + * Returns: true if it was, otherwise false + */ bool qemu_plugin_mem_is_sign_extended(qemu_plugin_meminfo_t info); +/** + * qemu_plugin_mem_is_big_endian() - was the access big endian + * @info: opaque memory transaction handle + * + * Returns: true if it was, otherwise false + */ bool qemu_plugin_mem_is_big_endian(qemu_plugin_meminfo_t info); +/** + * qemu_plugin_mem_is_store() - was the access a store + * @info: opaque memory transaction handle + * + * Returns: true if it was, otherwise false + */ bool qemu_plugin_mem_is_store(qemu_plugin_meminfo_t info); -/* - * qemu_plugin_get_hwaddr(): +/** + * qemu_plugin_get_hwaddr() - return handle for memory operation + * @info: opaque memory info structure * @vaddr: the virtual address of the memory operation * * For system emulation returns a qemu_plugin_hwaddr handle to query @@ -323,12 +449,30 @@ struct qemu_plugin_hwaddr *qemu_plugin_get_hwaddr(qemu_plugin_meminfo_t info, uint64_t vaddr); /* - * The following additional queries can be run on the hwaddr structure - * to return information about it. For non-IO accesses the device - * offset will be into the appropriate block of RAM. + * The following additional queries can be run on the hwaddr structure to + * return information about it - namely whether it is for an IO access and the + * physical address associated with the access. + */ + +/** + * qemu_plugin_hwaddr_is_io() - query whether memory operation is IO + * @haddr: address handle from qemu_plugin_get_hwaddr() + * + * Returns true if the handle's memory operation is to memory-mapped IO, or + * false if it is to RAM */ bool qemu_plugin_hwaddr_is_io(const struct qemu_plugin_hwaddr *haddr); -uint64_t qemu_plugin_hwaddr_device_offset(const struct qemu_plugin_hwaddr *haddr); + +/** + * qemu_plugin_hwaddr_phys_addr() - query physical address for memory operation + * @haddr: address handle from qemu_plugin_get_hwaddr() + * + * Returns the physical address associated with the memory operation + * + * Note that the returned physical address may not be unique if you are dealing + * with multiple address spaces. + */ +uint64_t qemu_plugin_hwaddr_phys_addr(const struct qemu_plugin_hwaddr *haddr); /* * Returns a string representing the device. The string is valid for |