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e47b8e1db9
Extend the PMU test suite to cover overflow interrupts. The test enables the PMI (Performance Monitor Interrupt), sets counter 0 to one less than the overflow value, and verifies that an interrupt is raised when the counter overflows. A guest interrupt handler checks the interrupt cause and disables further PMU interrupts upon success. Signed-off-by: Song Gao <gaosong@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>