uefi: Change the test memory device to a temporary file

Author: tmvkrpxl0

xtask/src/qemu.rs

@@ -483,10 +483,16 @@ 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("-object");
-    cmd.arg("memory-backend-file,size=1M,share,mem-path=/dev/shm/ivshmem,id=hostmem");
+    // Currently, providing host's virtual memory to guess is not supported on Windows
+    if !platform::is_windows() {
+        cmd.arg("-device");
+        cmd.arg("ivshmem-plain,memdev=tempmem,id=tempmem");
+        cmd.arg("-object");
+        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")?;