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system/bootdevice: Don't unregister reset handler in restore_boot_order()

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Currently the qemu_register_reset() API permits the reset handler functions
registered with it to remove themselves from within the callback function.
This is fine with our current implementation, but is a bit odd, because
generally reset is supposed to be idempotent, and doesn't fit well in a
three-phase-reset world where a resettable object will get multiple
callbacks as the system is reset.

We now have only one user of qemu_register_reset() which makes use of
the ability to unregister itself within the callback:
restore_boot_order().  We want to change our implementation of
qemu_register_reset() to something where it would be awkward to
maintain the "can self-unregister" feature.  Rather than making that
reimplementation complicated, change restore_boot_order() so that it
doesn't unregister itself but instead returns doing nothing for any
calls after it has done the "restore the boot order" work.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240220160622.114437-4-peter.maydell@linaro.org
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
This commit is contained in:
Peter Maydell 2024-02-20 16:06:15 +00:00
parent 7421ddc4dc
commit e41f32fe82
1 changed files with 14 additions and 11 deletions
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25
system/bootdevice.c
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@ -101,20 +101,23 @@ void validate_bootdevices(const char *devices, Error **errp)
void restore_boot_order(void *opaque)
{
char *normal_boot_order = opaque;
static int first = 1;
static int bootcount;
/* Restore boot order and remove ourselves after the first boot */
if (first) {
first = 0;
switch (bootcount++) {
case 0:
/* First boot: use the one-time config */
return;
case 1:
/* Second boot: restore normal boot order */
if (boot_set_handler) {
qemu_boot_set(normal_boot_order, &error_abort);
}
g_free(normal_boot_order);
return;
default:
/* Subsequent boots: keep using normal boot order */
return;
}
if (boot_set_handler) {
qemu_boot_set(normal_boot_order, &error_abort);
}
qemu_unregister_reset(restore_boot_order, normal_boot_order);
g_free(normal_boot_order);
}
void check_boot_index(int32_t bootindex, Error **errp)