From 8a43b1ea7fd02a8e9a5c5ef58017b1bd059663bb Mon Sep 17 00:00:00 2001 From: Chris Lalancette Date: Mon, 25 May 2009 16:38:23 +0200 Subject: Allow monitor interaction when using migrate -exec All, I've recently been playing around with migration via exec. Unfortunately, when starting the incoming qemu process with "-incoming exec:cmd", it suffers the same problem that -incoming tcp used to suffer; namely, that you can't interact with the monitor until after the migration has happened. This causes problems for libvirt usage of -incoming exec, since libvirt expects to be able to access the monitor ahead of time. This fairly simple patch allows you to access the monitor both before and after the migration has completed using exec. (note: developed/tested with qemu-kvm, but applies perfectly fine to qemu) Signed-off-by: Chris Lalancette Signed-off-by: Anthony Liguori --- hw/hw.h | 1 + migration-exec.c | 33 ++++++++++++++++++++++----------- savevm.c | 12 +++++++++++- 3 files changed, 34 insertions(+), 12 deletions(-) diff --git a/hw/hw.h b/hw/hw.h index a3f5717b3e..c83580073c 100644 --- a/hw/hw.h +++ b/hw/hw.h @@ -51,6 +51,7 @@ QEMUFile *qemu_fopen(const char *filename, const char *mode); QEMUFile *qemu_fopen_socket(int fd); QEMUFile *qemu_popen(FILE *popen_file, const char *mode); QEMUFile *qemu_popen_cmd(const char *command, const char *mode); +int qemu_popen_fd(QEMUFile *f); void qemu_fflush(QEMUFile *f); int qemu_fclose(QEMUFile *f); void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size); diff --git a/migration-exec.c b/migration-exec.c index f0869a1146..0dd5aff315 100644 --- a/migration-exec.c +++ b/migration-exec.c @@ -104,17 +104,11 @@ err_after_alloc: return NULL; } -int exec_start_incoming_migration(const char *command) +static void exec_accept_incoming_migration(void *opaque) { + QEMUFile *f = opaque; int ret; - QEMUFile *f; - dprintf("Attempting to start an incoming migration\n"); - f = qemu_popen_cmd(command, "r"); - if(f == NULL) { - dprintf("Unable to apply qemu wrapper to popen file\n"); - return -errno; - } vm_stop(0); /* just in case */ ret = qemu_loadvm_state(f); if (ret < 0) { @@ -123,11 +117,28 @@ int exec_start_incoming_migration(const char *command) } qemu_announce_self(); dprintf("successfully loaded vm state\n"); + /* we've successfully migrated, close the fd */ + qemu_set_fd_handler2(qemu_popen_fd(f), NULL, NULL, NULL, NULL); vm_start(); - qemu_fclose(f); - return 0; err: qemu_fclose(f); - return -errno; +} + +int exec_start_incoming_migration(const char *command) +{ + QEMUFile *f; + + dprintf("Attempting to start an incoming migration\n"); + f = qemu_popen_cmd(command, "r"); + if(f == NULL) { + dprintf("Unable to apply qemu wrapper to popen file\n"); + return -errno; + } + + qemu_set_fd_handler2(qemu_popen_fd(f), NULL, + exec_accept_incoming_migration, NULL, + (void *)(unsigned long)f); + + return 0; } diff --git a/savevm.c b/savevm.c index 68ffd03e6e..248aea3edf 100644 --- a/savevm.c +++ b/savevm.c @@ -244,7 +244,6 @@ QEMUFile *qemu_popen(FILE *popen_file, const char *mode) } else { s->file = qemu_fopen_ops(s, popen_put_buffer, NULL, popen_close, NULL, NULL); } - fprintf(stderr, "qemu_popen: returning result of qemu_fopen_ops\n"); return s->file; } @@ -260,6 +259,17 @@ QEMUFile *qemu_popen_cmd(const char *command, const char *mode) return qemu_popen(popen_file, mode); } +int qemu_popen_fd(QEMUFile *f) +{ + QEMUFilePopen *p; + int fd; + + p = (QEMUFilePopen *)f->opaque; + fd = fileno(p->popen_file); + + return fd; +} + QEMUFile *qemu_fopen_socket(int fd) { QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket)); -- cgit v1.2.3