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qdev: Implement qdev_create_fake_machine() for user emulation

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When a QDev instance is realized, qdev_get_machine() ends up called.
In the next commit, qdev_get_machine() will require a "machine"
container to be always present. To satisfy this QOM containers design,
Implement qdev_create_fake_machine() which creates a fake "machine"
container for user emulation.

On system emulation, qemu_create_machine() is called from qemu_init().
For user emulation, since the TCG accelerator always calls
tcg_init_machine(), we use it to hook our fake machine creation.

Suggested-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250102211800.79235-2-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2025-01-02 14:50:19 +01:00
parent ad1ea5ffa1
commit 558ee1ede6
4 changed files with 37 additions and 1 deletions
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10
include/hw/qdev-core.h
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@ -1023,6 +1023,16 @@ const char *qdev_fw_name(DeviceState *dev);
void qdev_assert_realized_properly(void);
Object *qdev_get_machine(void);
/**
* qdev_create_fake_machine(): Create a fake machine container.
*
* .. note::
* This function is a kludge for user emulation (USER_ONLY)
* because when thread (TYPE_CPU) are realized, qdev_realize()
* access a machine container.
*/
void qdev_create_fake_machine(void);
/**
* qdev_get_human_name() - Return a human-readable name for a device
* @dev: The device. Must be a valid and non-NULL pointer.