Merge remote-tracking branch 'remotes/amit-migration/tags/migration-2.7-2' into staging

migration: add TLS support to the migration data channel

This is a big refactoring of the migration backend code - moving away from
QEMUFile to the new QIOChannel framework introduced here.  This brings a
good level of abstraction and reduction of many lines of code.

This series also adds the ability for many backends (all except RDMA) to
use TLS for encrypting the migration data between the endpoints.

# gpg: Signature made Thu 26 May 2016 07:07:08 BST using RSA key ID 657EF670
# gpg: Good signature from "Amit Shah <amit@amitshah.net>"
# gpg:                 aka "Amit Shah <amit@kernel.org>"
# gpg:                 aka "Amit Shah <amitshah@gmx.net>"

* remotes/amit-migration/tags/migration-2.7-2: (28 commits)
  migration: remove qemu_get_fd method from QEMUFile
  migration: remove support for non-iovec based write handlers
  migration: add support for encrypting data with TLS
  migration: define 'tls-creds' and 'tls-hostname' migration parameters
  migration: don't use an array for storing migrate parameters
  migration: move definition of struct QEMUFile back into qemu-file.c
  migration: delete QEMUFile stdio implementation
  migration: delete QEMUFile sockets implementation
  migration: delete QEMUSizedBuffer struct
  migration: delete QEMUFile buffer implementation
  migration: convert savevm to use QIOChannel for writing to files
  migration: convert RDMA to use QIOChannel interface
  migration: convert exec socket protocol to use QIOChannel
  migration: convert fd socket protocol to use QIOChannel
  migration: convert tcp socket protocol to use QIOChannel
  migration: rename unix.c to socket.c
  migration: convert unix socket protocol to use QIOChannel
  migration: convert post-copy to use QIOChannelBuffer
  migration: add reporting of errors for outgoing migration
  migration: add helpers for creating QEMUFile from a QIOChannel
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 0 insertions, 323 deletions

diff --git a/migration/qemu-file-unix.c b/migration/qemu-file-unix.c
deleted file mode 100644
index 4474e18ff8..0000000000
--- a/migration/qemu-file-unix.c
+++ /dev/null
@@ -1,323 +0,0 @@
-/*
- * 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-common.h"
-#include "qemu/error-report.h"
-#include "qemu/iov.h"
-#include "qemu/sockets.h"
-#include "qemu/coroutine.h"
-#include "migration/qemu-file.h"
-#include "migration/qemu-file-internal.h"
-
-typedef struct QEMUFileSocket {
-    int fd;
-    QEMUFile *file;
-} QEMUFileSocket;
-
-static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
-                                    int64_t pos)
-{
-    QEMUFileSocket *s = opaque;
-    ssize_t len;
-    ssize_t size = iov_size(iov, iovcnt);
-    ssize_t offset = 0;
-    int     err;
-
-    while (size > 0) {
-        len = iov_send(s->fd, iov, iovcnt, offset, size);
-
-        if (len > 0) {
-            size -= len;
-            offset += len;
-        }
-
-        if (size > 0) {
-            if (errno != EAGAIN && errno != EWOULDBLOCK) {
-                error_report("socket_writev_buffer: Got err=%d for (%zu/%zu)",
-                             errno, (size_t)size, (size_t)len);
-                /*
-                 * If I've already sent some but only just got the error, I
-                 * could return the amount validly sent so far and wait for the
-                 * next call to report the error, but I'd rather flag the error
-                 * immediately.
-                 */
-                return -errno;
-            }
-
-            /* Emulate blocking */
-            GPollFD pfd;
-
-            pfd.fd = s->fd;
-            pfd.events = G_IO_OUT | G_IO_ERR;
-            pfd.revents = 0;
-            TFR(err = g_poll(&pfd, 1, -1 /* no timeout */));
-            /* Errors other than EINTR intentionally ignored */
-        }
-     }
-
-    return offset;
-}
-
-static int socket_get_fd(void *opaque)
-{
-    QEMUFileSocket *s = opaque;
-
-    return s->fd;
-}
-
-static ssize_t socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos,
-                                 size_t size)
-{
-    QEMUFileSocket *s = opaque;
-    ssize_t len;
-
-    for (;;) {
-        len = qemu_recv(s->fd, buf, size, 0);
-        if (len != -1) {
-            break;
-        }
-        if (errno == EAGAIN) {
-            yield_until_fd_readable(s->fd);
-        } else if (errno != EINTR) {
-            break;
-        }
-    }
-
-    if (len == -1) {
-        len = -errno;
-    }
-    return len;
-}
-
-static int socket_close(void *opaque)
-{
-    QEMUFileSocket *s = opaque;
-    closesocket(s->fd);
-    g_free(s);
-    return 0;
-}
-
-static int socket_shutdown(void *opaque, bool rd, bool wr)
-{
-    QEMUFileSocket *s = opaque;
-
-    if (shutdown(s->fd, rd ? (wr ? SHUT_RDWR : SHUT_RD) : SHUT_WR)) {
-        return -errno;
-    } else {
-        return 0;
-    }
-}
-
-static int socket_return_close(void *opaque)
-{
-    QEMUFileSocket *s = opaque;
-    /*
-     * Note: We don't close the socket, that should be done by the forward
-     * path.
-     */
-    g_free(s);
-    return 0;
-}
-
-static const QEMUFileOps socket_return_read_ops = {
-    .get_fd          = socket_get_fd,
-    .get_buffer      = socket_get_buffer,
-    .close           = socket_return_close,
-    .shut_down       = socket_shutdown,
-};
-
-static const QEMUFileOps socket_return_write_ops = {
-    .get_fd          = socket_get_fd,
-    .writev_buffer   = socket_writev_buffer,
-    .close           = socket_return_close,
-    .shut_down       = socket_shutdown,
-};
-
-/*
- * Give a QEMUFile* off the same socket but data in the opposite
- * direction.
- */
-static QEMUFile *socket_get_return_path(void *opaque)
-{
-    QEMUFileSocket *forward = opaque;
-    QEMUFileSocket *reverse;
-
-    if (qemu_file_get_error(forward->file)) {
-        /* If the forward file is in error, don't try and open a return */
-        return NULL;
-    }
-
-    reverse = g_malloc0(sizeof(QEMUFileSocket));
-    reverse->fd = forward->fd;
-    /* I don't think there's a better way to tell which direction 'this' is */
-    if (forward->file->ops->get_buffer != NULL) {
-        /* being called from the read side, so we need to be able to write */
-        return qemu_fopen_ops(reverse, &socket_return_write_ops);
-    } else {
-        return qemu_fopen_ops(reverse, &socket_return_read_ops);
-    }
-}
-
-static ssize_t unix_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
-                                  int64_t pos)
-{
-    QEMUFileSocket *s = opaque;
-    ssize_t len, offset;
-    ssize_t size = iov_size(iov, iovcnt);
-    ssize_t total = 0;
-
-    assert(iovcnt > 0);
-    offset = 0;
-    while (size > 0) {
-        /* Find the next start position; skip all full-sized vector elements  */
-        while (offset >= iov[0].iov_len) {
-            offset -= iov[0].iov_len;
-            iov++, iovcnt--;
-        }
-
-        /* skip `offset' bytes from the (now) first element, undo it on exit */
-        assert(iovcnt > 0);
-        iov[0].iov_base += offset;
-        iov[0].iov_len -= offset;
-
-        do {
-            len = writev(s->fd, iov, iovcnt);
-        } while (len == -1 && errno == EINTR);
-        if (len == -1) {
-            return -errno;
-        }
-
-        /* Undo the changes above */
-        iov[0].iov_base -= offset;
-        iov[0].iov_len += offset;
-
-        /* Prepare for the next iteration */
-        offset += len;
-        total += len;
-        size -= len;
-    }
-
-    return total;
-}
-
-static ssize_t unix_get_buffer(void *opaque, uint8_t *buf, int64_t pos,
-                              size_t size)
-{
-    QEMUFileSocket *s = opaque;
-    ssize_t len;
-
-    for (;;) {
-        len = read(s->fd, buf, size);
-        if (len != -1) {
-            break;
-        }
-        if (errno == EAGAIN) {
-            yield_until_fd_readable(s->fd);
-        } else if (errno != EINTR) {
-            break;
-        }
-    }
-
-    if (len == -1) {
-        len = -errno;
-    }
-    return len;
-}
-
-static int unix_close(void *opaque)
-{
-    QEMUFileSocket *s = opaque;
-    close(s->fd);
-    g_free(s);
-    return 0;
-}
-
-static const QEMUFileOps unix_read_ops = {
-    .get_fd =     socket_get_fd,
-    .get_buffer = unix_get_buffer,
-    .close =      unix_close
-};
-
-static const QEMUFileOps unix_write_ops = {
-    .get_fd =     socket_get_fd,
-    .writev_buffer = unix_writev_buffer,
-    .close =      unix_close
-};
-
-QEMUFile *qemu_fdopen(int fd, const char *mode)
-{
-    QEMUFileSocket *s;
-
-    if (mode == NULL ||
-        (mode[0] != 'r' && mode[0] != 'w') ||
-        mode[1] != 'b' || mode[2] != 0) {
-        fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
-        return NULL;
-    }
-
-    s = g_new0(QEMUFileSocket, 1);
-    s->fd = fd;
-
-    if (mode[0] == 'r') {
-        s->file = qemu_fopen_ops(s, &unix_read_ops);
-    } else {
-        s->file = qemu_fopen_ops(s, &unix_write_ops);
-    }
-    return s->file;
-}
-
-static const QEMUFileOps socket_read_ops = {
-    .get_fd          = socket_get_fd,
-    .get_buffer      = socket_get_buffer,
-    .close           = socket_close,
-    .shut_down       = socket_shutdown,
-    .get_return_path = socket_get_return_path
-};
-
-static const QEMUFileOps socket_write_ops = {
-    .get_fd          = socket_get_fd,
-    .writev_buffer   = socket_writev_buffer,
-    .close           = socket_close,
-    .shut_down       = socket_shutdown,
-    .get_return_path = socket_get_return_path
-};
-
-QEMUFile *qemu_fopen_socket(int fd, const char *mode)
-{
-    QEMUFileSocket *s;
-
-    if (qemu_file_mode_is_not_valid(mode)) {
-        return NULL;
-    }
-
-    s = g_new0(QEMUFileSocket, 1);
-    s->fd = fd;
-    if (mode[0] == 'w') {
-        qemu_set_block(s->fd);
-        s->file = qemu_fopen_ops(s, &socket_write_ops);
-    } else {
-        s->file = qemu_fopen_ops(s, &socket_read_ops);
-    }
-    return s->file;
-}