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Merge tag 'pull-maintainer-updates-280224-1' of https://gitlab.com/st…
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…squad/qemu into staging

Testing, gdbstub and plugin updates:

  - fix some test/tcg license headers to GPLv2+
  - bump up check-tcg timeout to 120s
  - avoid re-building VM images too often
  - update OpenBSD to 7.4
  - use GDBFeature to build gdbstub XML
  - unify plugin vcpu count under qemu_plugin_num_vcpus
  - avoid spurious idle/resume callbacks on new vCPUs
  - ensure nios2-linux-user processes async work
  - call vcpu_init plugin callback through async work
  - define plugin helpers when registers being read
  - add plugin API for reading register values
  - add support for register tracking to execlog
  - update plugin docs with assumptions
  - mention plugins can trigger tb_flush in mttcg design doc

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# gpg: Signature made Wed 28 Feb 2024 09:55:09 GMT
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
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* tag 'pull-maintainer-updates-280224-1' of https://gitlab.com/stsquad/qemu: (29 commits)
  docs/devel: plugins can trigger a tb flush
  docs/devel: document some plugin assumptions
  docs/devel: lift example and plugin API sections up
  contrib/plugins: extend execlog to track register changes
  contrib/plugins: fix imatch
  tests/tcg: expand insn test case to exercise register API
  plugins: add an API to read registers
  plugins: create CPUPluginState and migrate plugin_mask
  gdbstub: expose api to find registers
  plugins: Use different helpers when reading registers
  cpu: call plugin init hook asynchronously
  linux-user: ensure nios2 processes queued work
  plugins: fix order of init/idle/resume callback
  plugins: add qemu_plugin_num_vcpus function
  plugins: remove previous n_vcpus functions from API
  gdbstub: Add members to identify registers to GDBFeature
  hw/core/cpu: Remove gdb_get_dynamic_xml member
  gdbstub: Infer number of core registers from XML
  gdbstub: Simplify XML lookup
  gdbstub: Change gdb_get_reg_cb and gdb_set_reg_cb
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@pm215
pm215 committed Feb 28, 2024
2 parents 158a054 + 02ca5ec commit d316f1b
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Showing 65 changed files with 1,237 additions and 661 deletions.
46 changes: 41 additions & 5 deletions accel/tcg/plugin-gen.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@
* CPU's index into a TCG temp, since the first callback did it already.
*/
#include "qemu/osdep.h"
#include "qemu/plugin.h"
#include "cpu.h"
#include "tcg/tcg.h"
#include "tcg/tcg-temp-internal.h"
Expand Down Expand Up @@ -79,6 +80,7 @@ enum plugin_gen_from {

enum plugin_gen_cb {
PLUGIN_GEN_CB_UDATA,
PLUGIN_GEN_CB_UDATA_R,
PLUGIN_GEN_CB_INLINE,
PLUGIN_GEN_CB_MEM,
PLUGIN_GEN_ENABLE_MEM_HELPER,
Expand All @@ -90,28 +92,41 @@ enum plugin_gen_cb {
* These helpers are stubs that get dynamically switched out for calls
* direct to the plugin if they are subscribed to.
*/
void HELPER(plugin_vcpu_udata_cb)(uint32_t cpu_index, void *udata)
void HELPER(plugin_vcpu_udata_cb_no_wg)(uint32_t cpu_index, void *udata)
{ }

void HELPER(plugin_vcpu_udata_cb_no_rwg)(uint32_t cpu_index, void *udata)
{ }

void HELPER(plugin_vcpu_mem_cb)(unsigned int vcpu_index,
qemu_plugin_meminfo_t info, uint64_t vaddr,
void *userdata)
{ }

static void gen_empty_udata_cb(void)
static void gen_empty_udata_cb(void (*gen_helper)(TCGv_i32, TCGv_ptr))
{
TCGv_i32 cpu_index = tcg_temp_ebb_new_i32();
TCGv_ptr udata = tcg_temp_ebb_new_ptr();

tcg_gen_movi_ptr(udata, 0);
tcg_gen_ld_i32(cpu_index, tcg_env,
-offsetof(ArchCPU, env) + offsetof(CPUState, cpu_index));
gen_helper_plugin_vcpu_udata_cb(cpu_index, udata);
gen_helper(cpu_index, udata);

tcg_temp_free_ptr(udata);
tcg_temp_free_i32(cpu_index);
}

static void gen_empty_udata_cb_no_wg(void)
{
gen_empty_udata_cb(gen_helper_plugin_vcpu_udata_cb_no_wg);
}

static void gen_empty_udata_cb_no_rwg(void)
{
gen_empty_udata_cb(gen_helper_plugin_vcpu_udata_cb_no_rwg);
}

/*
* For now we only support addi_i64.
* When we support more ops, we can generate one empty inline cb for each.
Expand Down Expand Up @@ -192,7 +207,8 @@ static void plugin_gen_empty_callback(enum plugin_gen_from from)
gen_empty_mem_helper);
/* fall through */
case PLUGIN_GEN_FROM_TB:
gen_wrapped(from, PLUGIN_GEN_CB_UDATA, gen_empty_udata_cb);
gen_wrapped(from, PLUGIN_GEN_CB_UDATA, gen_empty_udata_cb_no_rwg);
gen_wrapped(from, PLUGIN_GEN_CB_UDATA_R, gen_empty_udata_cb_no_wg);
gen_wrapped(from, PLUGIN_GEN_CB_INLINE, gen_empty_inline_cb);
break;
default:
Expand Down Expand Up @@ -588,6 +604,12 @@ static void plugin_gen_tb_udata(const struct qemu_plugin_tb *ptb,
inject_udata_cb(ptb->cbs[PLUGIN_CB_REGULAR], begin_op);
}

static void plugin_gen_tb_udata_r(const struct qemu_plugin_tb *ptb,
TCGOp *begin_op)
{
inject_udata_cb(ptb->cbs[PLUGIN_CB_REGULAR_R], begin_op);
}

static void plugin_gen_tb_inline(const struct qemu_plugin_tb *ptb,
TCGOp *begin_op)
{
Expand All @@ -602,6 +624,14 @@ static void plugin_gen_insn_udata(const struct qemu_plugin_tb *ptb,
inject_udata_cb(insn->cbs[PLUGIN_CB_INSN][PLUGIN_CB_REGULAR], begin_op);
}

static void plugin_gen_insn_udata_r(const struct qemu_plugin_tb *ptb,
TCGOp *begin_op, int insn_idx)
{
struct qemu_plugin_insn *insn = g_ptr_array_index(ptb->insns, insn_idx);

inject_udata_cb(insn->cbs[PLUGIN_CB_INSN][PLUGIN_CB_REGULAR_R], begin_op);
}

static void plugin_gen_insn_inline(const struct qemu_plugin_tb *ptb,
TCGOp *begin_op, int insn_idx)
{
Expand Down Expand Up @@ -721,6 +751,9 @@ static void plugin_gen_inject(struct qemu_plugin_tb *plugin_tb)
case PLUGIN_GEN_CB_UDATA:
plugin_gen_tb_udata(plugin_tb, op);
break;
case PLUGIN_GEN_CB_UDATA_R:
plugin_gen_tb_udata_r(plugin_tb, op);
break;
case PLUGIN_GEN_CB_INLINE:
plugin_gen_tb_inline(plugin_tb, op);
break;
Expand All @@ -737,6 +770,9 @@ static void plugin_gen_inject(struct qemu_plugin_tb *plugin_tb)
case PLUGIN_GEN_CB_UDATA:
plugin_gen_insn_udata(plugin_tb, op, insn_idx);
break;
case PLUGIN_GEN_CB_UDATA_R:
plugin_gen_insn_udata_r(plugin_tb, op, insn_idx);
break;
case PLUGIN_GEN_CB_INLINE:
plugin_gen_insn_inline(plugin_tb, op, insn_idx);
break;
Expand Down Expand Up @@ -796,7 +832,7 @@ bool plugin_gen_tb_start(CPUState *cpu, const DisasContextBase *db,
{
bool ret = false;

if (test_bit(QEMU_PLUGIN_EV_VCPU_TB_TRANS, cpu->plugin_mask)) {
if (test_bit(QEMU_PLUGIN_EV_VCPU_TB_TRANS, cpu->plugin_state->event_mask)) {
struct qemu_plugin_tb *ptb = tcg_ctx->plugin_tb;
int i;

Expand Down
3 changes: 2 additions & 1 deletion accel/tcg/plugin-helpers.h
View file
Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
#ifdef CONFIG_PLUGIN
DEF_HELPER_FLAGS_2(plugin_vcpu_udata_cb, TCG_CALL_NO_RWG | TCG_CALL_PLUGIN, void, i32, ptr)
DEF_HELPER_FLAGS_2(plugin_vcpu_udata_cb_no_wg, TCG_CALL_NO_WG | TCG_CALL_PLUGIN, void, i32, ptr)
DEF_HELPER_FLAGS_2(plugin_vcpu_udata_cb_no_rwg, TCG_CALL_NO_RWG | TCG_CALL_PLUGIN, void, i32, ptr)
DEF_HELPER_FLAGS_4(plugin_vcpu_mem_cb, TCG_CALL_NO_RWG | TCG_CALL_PLUGIN, void, i32, i32, i64, ptr)
#endif
2 changes: 1 addition & 1 deletion contrib/plugins/cache.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -767,7 +767,7 @@ int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,

policy = LRU;

cores = sys ? qemu_plugin_n_vcpus() : 1;
cores = sys ? info->system.smp_vcpus : 1;

for (i = 0; i < argc; i++) {
char *opt = argv[i];
Expand Down

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