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author | Claudio Fontana <cfontana@suse.de> | 2020-08-19 13:17:19 +0200 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-10-05 16:41:22 +0200 |
commit | 740b175973427bcfa32ad894bb1f83b96d184c28 (patch) | |
tree | 3613e83be5fd8620b369479b98e6ede5d5746a9a /accel | |
parent | 0ac0b47c44b4be6cbce26777a1a5968cc8f025a5 (diff) | |
download | qemu-740b175973427bcfa32ad894bb1f83b96d184c28.zip qemu-740b175973427bcfa32ad894bb1f83b96d184c28.tar.gz qemu-740b175973427bcfa32ad894bb1f83b96d184c28.tar.bz2 |
cpu-timers, icount: new modules
refactoring of cpus.c continues with cpu timer state extraction.
cpu-timers: responsible for the softmmu cpu timers state,
including cpu clocks and ticks.
icount: counts the TCG instructions executed. As such it is specific to
the TCG accelerator. Therefore, it is built only under CONFIG_TCG.
One complication is due to qtest, which uses an icount field to warp time
as part of qtest (qtest_clock_warp).
In order to solve this problem, provide a separate counter for qtest.
This requires fixing assumptions scattered in the code that
qtest_enabled() implies icount_enabled(), checking each specific case.
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
[remove redundant initialization with qemu_spice_init]
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
[fix lingering calls to icount_get]
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'accel')
-rw-r--r-- | accel/qtest.c | 6 | ||||
-rw-r--r-- | accel/tcg/cpu-exec.c | 39 | ||||
-rw-r--r-- | accel/tcg/tcg-all.c | 7 | ||||
-rw-r--r-- | accel/tcg/translate-all.c | 3 |
4 files changed, 41 insertions, 14 deletions
diff --git a/accel/qtest.c b/accel/qtest.c index 5b88f55..119d0f1 100644 --- a/accel/qtest.c +++ b/accel/qtest.c @@ -19,14 +19,10 @@ #include "sysemu/accel.h" #include "sysemu/qtest.h" #include "sysemu/cpus.h" +#include "sysemu/cpu-timers.h" static int qtest_init_accel(MachineState *ms) { - QemuOpts *opts = qemu_opts_create(qemu_find_opts("icount"), NULL, 0, - &error_abort); - qemu_opt_set(opts, "shift", "0", &error_abort); - configure_icount(opts, &error_abort); - qemu_opts_del(opts); return 0; } diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index e10b462..35bfe2c 100644 --- a/accel/tcg/cpu-exec.c +++ b/accel/tcg/cpu-exec.c @@ -19,6 +19,7 @@ #include "qemu/osdep.h" #include "qemu-common.h" +#include "qemu/qemu-print.h" #include "cpu.h" #include "trace.h" #include "disas/disas.h" @@ -36,6 +37,8 @@ #include "hw/i386/apic.h" #endif #include "sysemu/cpus.h" +#include "exec/cpu-all.h" +#include "sysemu/cpu-timers.h" #include "sysemu/replay.h" /* -icount align implementation. */ @@ -56,6 +59,9 @@ typedef struct SyncClocks { #define MAX_DELAY_PRINT_RATE 2000000000LL #define MAX_NB_PRINTS 100 +static int64_t max_delay; +static int64_t max_advance; + static void align_clocks(SyncClocks *sc, CPUState *cpu) { int64_t cpu_icount; @@ -98,9 +104,9 @@ static void print_delay(const SyncClocks *sc) (-sc->diff_clk / (float)1000000000LL < (threshold_delay - THRESHOLD_REDUCE))) { threshold_delay = (-sc->diff_clk / 1000000000LL) + 1; - printf("Warning: The guest is now late by %.1f to %.1f seconds\n", - threshold_delay - 1, - threshold_delay); + qemu_printf("Warning: The guest is now late by %.1f to %.1f seconds\n", + threshold_delay - 1, + threshold_delay); nb_prints++; last_realtime_clock = sc->realtime_clock; } @@ -615,7 +621,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu, /* Finally, check if we need to exit to the main loop. */ if (unlikely(qatomic_read(&cpu->exit_request)) - || (use_icount + || (icount_enabled() && cpu_neg(cpu)->icount_decr.u16.low + cpu->icount_extra == 0)) { qatomic_set(&cpu->exit_request, 0); if (cpu->exception_index == -1) { @@ -656,7 +662,7 @@ static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb, } /* Instruction counter expired. */ - assert(use_icount); + assert(icount_enabled()); #ifndef CONFIG_USER_ONLY /* Ensure global icount has gone forward */ cpu_update_icount(cpu); @@ -759,3 +765,26 @@ int cpu_exec(CPUState *cpu) return ret; } + +#ifndef CONFIG_USER_ONLY + +void dump_drift_info(void) +{ + if (!icount_enabled()) { + return; + } + + qemu_printf("Host - Guest clock %"PRIi64" ms\n", + (cpu_get_clock() - cpu_get_icount()) / SCALE_MS); + if (icount_align_option) { + qemu_printf("Max guest delay %"PRIi64" ms\n", + -max_delay / SCALE_MS); + qemu_printf("Max guest advance %"PRIi64" ms\n", + max_advance / SCALE_MS); + } else { + qemu_printf("Max guest delay NA\n"); + qemu_printf("Max guest advance NA\n"); + } +} + +#endif /* !CONFIG_USER_ONLY */ diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c index 1c66492..2d13df3 100644 --- a/accel/tcg/tcg-all.c +++ b/accel/tcg/tcg-all.c @@ -29,6 +29,7 @@ #include "qom/object.h" #include "cpu.h" #include "sysemu/cpus.h" +#include "sysemu/cpu-timers.h" #include "qemu/main-loop.h" #include "tcg/tcg.h" #include "qapi/error.h" @@ -66,7 +67,7 @@ static void tcg_handle_interrupt(CPUState *cpu, int mask) qemu_cpu_kick(cpu); } else { qatomic_set(&cpu_neg(cpu)->icount_decr.u16.high, -1); - if (use_icount && + if (icount_enabled() && !cpu->can_do_io && (mask & ~old_mask) != 0) { cpu_abort(cpu, "Raised interrupt while not in I/O function"); @@ -105,7 +106,7 @@ static bool check_tcg_memory_orders_compatible(void) static bool default_mttcg_enabled(void) { - if (use_icount || TCG_OVERSIZED_GUEST) { + if (icount_enabled() || TCG_OVERSIZED_GUEST) { return false; } else { #ifdef TARGET_SUPPORTS_MTTCG @@ -147,7 +148,7 @@ static void tcg_set_thread(Object *obj, const char *value, Error **errp) if (strcmp(value, "multi") == 0) { if (TCG_OVERSIZED_GUEST) { error_setg(errp, "No MTTCG when guest word size > hosts"); - } else if (use_icount) { + } else if (icount_enabled()) { error_setg(errp, "No MTTCG when icount is enabled"); } else { #ifndef TARGET_SUPPORTS_MTTCG diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index e82fc35..d760972 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -57,6 +57,7 @@ #include "qemu/main-loop.h" #include "exec/log.h" #include "sysemu/cpus.h" +#include "sysemu/cpu-timers.h" #include "sysemu/tcg.h" /* #define DEBUG_TB_INVALIDATE */ @@ -369,7 +370,7 @@ static int cpu_restore_state_from_tb(CPUState *cpu, TranslationBlock *tb, found: if (reset_icount && (tb_cflags(tb) & CF_USE_ICOUNT)) { - assert(use_icount); + assert(icount_enabled()); /* Reset the cycle counter to the start of the block and shift if to the number of actually executed instructions */ cpu_neg(cpu)->icount_decr.u16.low += num_insns - i; |