uefi: Change the test memory device to a temporary file

Author: tmvkrpxl0

xtask/src/qemu.rs

@@ -484,9 +484,12 @@ pub fn run_qemu(arch: UefiArch, opt: &QemuOpt) -> Result<()> {
     // Sixth shared memory device used for testing Pci Root Bridge I/O's Copy function.
     // This is to provide a PCI device with large enough memory.
     cmd.arg("-device");
-    cmd.arg("ivshmem-plain,memdev=hostmem,id=hostmem");
+    cmd.arg("ivshmem-plain,memdev=tempmem,id=tempmem");
     cmd.arg("-object");
-    cmd.arg("memory-backend-file,size=1M,share,mem-path=/dev/shm/ivshmem,id=hostmem");
+    let mut object_args = OsString::from("memory-backend-file,size=1M,id=tempmem,mem-path=");
+    let ram_path = tmp_dir.join("copy-test.ram");
+    object_args.push(ram_path);
+    cmd.arg(object_args);
 
     let qemu_monitor_pipe = Pipe::new(tmp_dir, "qemu-monitor")?;
     let serial_pipe = Pipe::new(tmp_dir, "serial")?;