[libvirt RFCv9 15/31] qemu: saveimage: wire up saveimage code with the multifd helper
use the multifd helper and the new virQEMUSaveFd APIs for multifd.
Signed-off-by: Claudio Fontana <cfontana(a)suse.de>
---
src/qemu/qemu_saveimage.c | 42 ++++++++++++++++++++++++++++++++++++---
1 file changed, 39 insertions(+), 3 deletions(-)
diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index 9fe51b6f13..2b56214f90 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -17,6 +17,7 @@
*/
#include <config.h>
+#include <configmake.h>
#include "qemu_saveimage.h"
#include "qemu_domain.h"
@@ -585,6 +586,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
{
g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
virQEMUSaveFd saveFd = QEMU_SAVEFD_INVALID;
+ virQEMUSaveFd *multiFd = NULL;
unsigned int oflags = O_WRONLY | O_TRUNC | O_CREAT;
int ret = -1;
@@ -604,9 +606,42 @@ qemuSaveImageCreate(virQEMUDriver *driver,
if (virQEMUSaveDataWrite(data, saveFd.fd, saveFd.path) < 0)
goto cleanup;
- /* Perform the migration */
- if (qemuMigrationSrcToFile(driver, vm, saveFd.fd, compressor, asyncJob) < 0)
- goto cleanup;
+ if (flags & VIR_DOMAIN_SAVE_PARALLEL) {
+ g_autoptr(virCommand) cmd = NULL;
+ g_autofree char *helper_path = NULL;
+ qemuDomainObjPrivate *priv = vm->privateData;
+ g_autofree char *sun_path = g_strdup_printf("%s/save-multifd.sock",
priv->libDir);
+ char buf[1];
+ int helper_out = -1;
+ if (!(helper_path = virFileFindResource("libvirt_multifd_helper",
+ abs_top_builddir "/src",
+ LIBEXECDIR)))
+ goto cleanup;
+ cmd = virCommandNewArgList(helper_path, sun_path, NULL);
+ virCommandAddArgFormat(cmd, "%d", nconn);
+ virCommandAddArgFormat(cmd, "%d", saveFd.fd);
+ virCommandPassFD(cmd, saveFd.fd, 0);
+ virCommandSetOutputFD(cmd, &helper_out); /* should create pipe automagically
*/
+
+ /* Perform parallel multifd migration to files (main fd + channels) */
+ if (!(multiFd = qemuSaveImageCreateMultiFd(driver, vm, cmd, saveFd.path, oflags,
cfg, nconn)))
+ goto cleanup;
+ if (virCommandRunAsync(cmd, NULL) < 0)
+ goto cleanup;
+ if (saferead(helper_out, &buf, 1) != 1 || buf[0] != 'R')
+ goto cleanup;
+ if (chown(sun_path, cfg->user, cfg->group) < 0)
+ goto cleanup;
+ /* still using single fd migration for now */
+ if (qemuMigrationSrcToFile(driver, vm, saveFd.fd, compressor, asyncJob) < 0)
+ goto cleanup;
+ if (qemuSaveImageCloseMultiFd(multiFd, nconn, vm) < 0)
+ goto cleanup;
+ } else {
+ /* Perform non-parallel migration to file */
+ if (qemuMigrationSrcToFile(driver, vm, saveFd.fd, compressor, asyncJob) < 0)
+ goto cleanup;
+ }
if (virQEMUSaveFdClose(&saveFd, vm) < 0)
goto cleanup;
@@ -625,6 +660,7 @@ qemuSaveImageCreate(virQEMUDriver *driver,
ret = 0;
cleanup:
+ ret = qemuSaveImageFreeMultiFd(multiFd, vm, nconn, ret);
ret = virQEMUSaveFdFini(&saveFd, vm, ret);
return ret;
}
--
2.35.3