unsoundness in nvme_configure_admin_queue(&mut self)

[lwz23]

Hello, thank you for your contribution in this project, I am scanning the unsoundness problem in rust project.
I notice the following code:

pub fn nvme_configure_admin_queue(&mut self) {
        let mut admin_queue = self.admin_queue.lock();

        let bar = self.bar;
        let dbs = bar + NVME_REG_DBS;

        let sq_dma_pa = admin_queue.sq_pa as u32;
        let cq_dma_pa = admin_queue.cq_pa as u32;
        let data_dma_pa = admin_queue.data_pa as u64;

        let aqa_low_16 = 31_u16;
        let aqa_high_16 = 31_u16;
        let aqa = (aqa_high_16 as u32) << 16 | aqa_low_16 as u32;
        let aqa_address = bar + NVME_REG_AQA;

        // 将admin queue配置信息写入nvme设备寄存器AQA (admin_queue_attributes)
        unsafe {
            write_volatile(aqa_address as *mut u32, aqa);
        }

        // 将admin queue的sq dma物理地址写入nvme设备上的寄存器ASQ
        let asq_address = bar + NVME_REG_ASQ;
        unsafe {
            write_volatile(asq_address as *mut u32, sq_dma_pa);
        }
.................

This is because it converts a pointer of type 'usize' to a pointer of type 'u32', which requires 4-byte alignment, while a pointer of type 'usize' does not guarantee this alignment. This can result in undefined behavior (UB).

[lwz23]

same for

zCore/drivers/src/nvme/interface.rs

Line 126 in 43ff1c9

pub fn nvme_alloc_io_queue(&mut self) {