From e02cda008591317b1625707ff8e115a4841aa889 Mon Sep 17 00:00:00 2001
From: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Date: Tue, 10 Oct 2023 11:40:56 +0000
Subject: Introduce Virtio-loopback epsilon release:
Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9
---
chardev/char-win.c | 244 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 244 insertions(+)
create mode 100644 chardev/char-win.c
(limited to 'chardev/char-win.c')
diff --git a/chardev/char-win.c b/chardev/char-win.c
new file mode 100644
index 000000000..d4fb44c4d
--- /dev/null
+++ b/chardev/char-win.c
@@ -0,0 +1,244 @@
+/*
+ * QEMU System Emulator
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/main-loop.h"
+#include "qemu/module.h"
+#include "qapi/error.h"
+#include "chardev/char-win.h"
+
+static void win_chr_read(Chardev *chr, DWORD len)
+{
+ WinChardev *s = WIN_CHARDEV(chr);
+ int max_size = qemu_chr_be_can_write(chr);
+ int ret, err;
+ uint8_t buf[CHR_READ_BUF_LEN];
+ DWORD size;
+
+ if (len > max_size) {
+ len = max_size;
+ }
+ if (len == 0) {
+ return;
+ }
+
+ ZeroMemory(&s->orecv, sizeof(s->orecv));
+ s->orecv.hEvent = s->hrecv;
+ ret = ReadFile(s->file, buf, len, &size, &s->orecv);
+ if (!ret) {
+ err = GetLastError();
+ if (err == ERROR_IO_PENDING) {
+ ret = GetOverlappedResult(s->file, &s->orecv, &size, TRUE);
+ }
+ }
+
+ if (size > 0) {
+ qemu_chr_be_write(chr, buf, size);
+ }
+}
+
+static int win_chr_serial_poll(void *opaque)
+{
+ Chardev *chr = CHARDEV(opaque);
+ WinChardev *s = WIN_CHARDEV(opaque);
+ COMSTAT status;
+ DWORD comerr;
+
+ ClearCommError(s->file, &comerr, &status);
+ if (status.cbInQue > 0) {
+ win_chr_read(chr, status.cbInQue);
+ return 1;
+ }
+ return 0;
+}
+
+int win_chr_serial_init(Chardev *chr, const char *filename, Error **errp)
+{
+ WinChardev *s = WIN_CHARDEV(chr);
+ COMMCONFIG comcfg;
+ COMMTIMEOUTS cto = { 0, 0, 0, 0, 0};
+ COMSTAT comstat;
+ DWORD size;
+ DWORD err;
+
+ s->hsend = CreateEvent(NULL, TRUE, FALSE, NULL);
+ if (!s->hsend) {
+ error_setg(errp, "Failed CreateEvent");
+ goto fail;
+ }
+ s->hrecv = CreateEvent(NULL, TRUE, FALSE, NULL);
+ if (!s->hrecv) {
+ error_setg(errp, "Failed CreateEvent");
+ goto fail;
+ }
+
+ s->file = CreateFile(filename, GENERIC_READ | GENERIC_WRITE, 0, NULL,
+ OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
+ if (s->file == INVALID_HANDLE_VALUE) {
+ error_setg_win32(errp, GetLastError(), "Failed CreateFile");
+ s->file = NULL;
+ goto fail;
+ }
+
+ if (!SetupComm(s->file, NRECVBUF, NSENDBUF)) {
+ error_setg(errp, "Failed SetupComm");
+ goto fail;
+ }
+
+ ZeroMemory(&comcfg, sizeof(COMMCONFIG));
+ size = sizeof(COMMCONFIG);
+ GetDefaultCommConfig(filename, &comcfg, &size);
+ comcfg.dcb.DCBlength = sizeof(DCB);
+ CommConfigDialog(filename, NULL, &comcfg);
+
+ if (!SetCommState(s->file, &comcfg.dcb)) {
+ error_setg(errp, "Failed SetCommState");
+ goto fail;
+ }
+
+ if (!SetCommMask(s->file, EV_ERR)) {
+ error_setg(errp, "Failed SetCommMask");
+ goto fail;
+ }
+
+ cto.ReadIntervalTimeout = MAXDWORD;
+ if (!SetCommTimeouts(s->file, &cto)) {
+ error_setg(errp, "Failed SetCommTimeouts");
+ goto fail;
+ }
+
+ if (!ClearCommError(s->file, &err, &comstat)) {
+ error_setg(errp, "Failed ClearCommError");
+ goto fail;
+ }
+ qemu_add_polling_cb(win_chr_serial_poll, chr);
+ return 0;
+
+ fail:
+ return -1;
+}
+
+int win_chr_pipe_poll(void *opaque)
+{
+ Chardev *chr = CHARDEV(opaque);
+ WinChardev *s = WIN_CHARDEV(opaque);
+ DWORD size;
+
+ PeekNamedPipe(s->file, NULL, 0, NULL, &size, NULL);
+ if (size > 0) {
+ win_chr_read(chr, size);
+ return 1;
+ }
+ return 0;
+}
+
+/* Called with chr_write_lock held. */
+static int win_chr_write(Chardev *chr, const uint8_t *buf, int len1)
+{
+ WinChardev *s = WIN_CHARDEV(chr);
+ DWORD len, ret, size, err;
+
+ len = len1;
+ ZeroMemory(&s->osend, sizeof(s->osend));
+ s->osend.hEvent = s->hsend;
+ while (len > 0) {
+ if (s->hsend) {
+ ret = WriteFile(s->file, buf, len, &size, &s->osend);
+ } else {
+ ret = WriteFile(s->file, buf, len, &size, NULL);
+ }
+ if (!ret) {
+ err = GetLastError();
+ if (err == ERROR_IO_PENDING) {
+ ret = GetOverlappedResult(s->file, &s->osend, &size, TRUE);
+ if (ret) {
+ buf += size;
+ len -= size;
+ } else {
+ break;
+ }
+ } else {
+ break;
+ }
+ } else {
+ buf += size;
+ len -= size;
+ }
+ }
+ return len1 - len;
+}
+
+static void char_win_finalize(Object *obj)
+{
+ Chardev *chr = CHARDEV(obj);
+ WinChardev *s = WIN_CHARDEV(chr);
+
+ if (s->hsend) {
+ CloseHandle(s->hsend);
+ }
+ if (s->hrecv) {
+ CloseHandle(s->hrecv);
+ }
+ if (!s->keep_open && s->file) {
+ CloseHandle(s->file);
+ }
+ if (s->fpipe) {
+ qemu_del_polling_cb(win_chr_pipe_poll, chr);
+ } else {
+ qemu_del_polling_cb(win_chr_serial_poll, chr);
+ }
+
+ qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
+}
+
+void win_chr_set_file(Chardev *chr, HANDLE file, bool keep_open)
+{
+ WinChardev *s = WIN_CHARDEV(chr);
+
+ s->keep_open = keep_open;
+ s->file = file;
+}
+
+static void char_win_class_init(ObjectClass *oc, void *data)
+{
+ ChardevClass *cc = CHARDEV_CLASS(oc);
+
+ cc->chr_write = win_chr_write;
+}
+
+static const TypeInfo char_win_type_info = {
+ .name = TYPE_CHARDEV_WIN,
+ .parent = TYPE_CHARDEV,
+ .instance_size = sizeof(WinChardev),
+ .instance_finalize = char_win_finalize,
+ .class_init = char_win_class_init,
+ .abstract = true,
+};
+
+static void register_types(void)
+{
+ type_register_static(&char_win_type_info);
+}
+
+type_init(register_types);
--
cgit