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plugins: scoreboard API

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We introduce a cpu local storage, automatically managed (and extended)
by QEMU itself. Plugin allocate a scoreboard, and don't have to deal
with how many cpus are launched.

This API will be used by new inline functions but callbacks can benefit
from this as well. This way, they can operate without a global lock for
simple operations.

At any point during execution, any scoreboard will be dimensioned with
at least qemu_plugin_num_vcpus entries.

New functions:
- qemu_plugin_scoreboard_find
- qemu_plugin_scoreboard_free
- qemu_plugin_scoreboard_new

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20240304130036.124418-2-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240305121005.3528075-15-alex.bennee@linaro.org>
This commit is contained in:
Pierrick Bouvier 2024-03-05 12:09:50 +00:00 • committed by Alex Bennée
parent b9504c9ad9
commit a3c2cf0b89
6 changed files with 122 additions and 0 deletions
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19
plugins/api.c
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@ -465,3 +465,22 @@ int qemu_plugin_read_register(struct qemu_plugin_register *reg, GByteArray *buf)
return gdb_read_register(current_cpu, buf, GPOINTER_TO_INT(reg));
}
struct qemu_plugin_scoreboard *qemu_plugin_scoreboard_new(size_t element_size)
{
return plugin_scoreboard_new(element_size);
}
void qemu_plugin_scoreboard_free(struct qemu_plugin_scoreboard *score)
{
plugin_scoreboard_free(score);
}
void *qemu_plugin_scoreboard_find(struct qemu_plugin_scoreboard *score,
unsigned int vcpu_index)
{
g_assert(vcpu_index < qemu_plugin_num_vcpus());
/* we can't use g_array_index since entry size is not statically known */
char *base_ptr = score->data->data;
return base_ptr + vcpu_index * g_array_get_element_size(score->data);
}