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plugins: Add enforcement of QEMU_PLUGIN_CB flags in register R/W callbacks

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This patch adds functionality to enforce the requested QEMU_PLUGIN_CB_
flags level passed when registering a callback function using the
plugins API. Each time a callback is about to be invoked, a thread-local
variable will be updated with the level that callback requested. Then,
called API functions (in particular, the register read and write API)
will call qemu_plugin_get_cb_flags() to check the level is at least the
level they require.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Rowan Hart <rowanbhart@gmail.com>
Message-ID: <20250624175351.440780-4-rowanbhart@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20250627112512.1880708-8-alex.bennee@linaro.org>
This commit is contained in:
Rowan Hart
2025-07-02 10:09:48 +01:00
committed by Alex Bennée
parent 1a92b65859
commit 766e00bd57
6 changed files with 96 additions and 6 deletions
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plugins/api.c
+4
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@@ -437,6 +437,10 @@ int qemu_plugin_read_register(struct qemu_plugin_register *reg, GByteArray *buf)
{
g_assert(current_cpu);
if (qemu_plugin_get_cb_flags() == QEMU_PLUGIN_CB_NO_REGS) {
return -1;
}
return gdb_read_register(current_cpu, buf, GPOINTER_TO_INT(reg) - 1);
}