[libvirt] [PATCH 2/3 v4] qemu: allow the client to choose the vmcore's format
Wen Congyang
wency at cn.fujitsu.com
Fri Apr 20 07:29:57 UTC 2012
This patch updates qemu driver to allow the client to choose the
vmcore's format: memory only or including device state.
---
include/libvirt/libvirt.h.in | 1 +
src/qemu/qemu_domain.c | 1 +
src/qemu/qemu_domain.h | 1 +
src/qemu/qemu_driver.c | 54 +++++++++++++++++++++++++++++++----------
4 files changed, 44 insertions(+), 13 deletions(-)
diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index 97ad99d..5f03043 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -927,6 +927,7 @@ typedef enum {
VIR_DUMP_LIVE = (1 << 1), /* live dump */
VIR_DUMP_BYPASS_CACHE = (1 << 2), /* avoid file system cache pollution */
VIR_DUMP_RESET = (1 << 3), /* reset domain after dump finishes */
+ VIR_DUMP_MEMORY_ONLY = (1 << 4), /* use dump-guest-memory */
} virDomainCoreDumpFlags;
/* Domain migration flags. */
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 4dda2e0..e81f439 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -160,6 +160,7 @@ qemuDomainObjResetAsyncJob(qemuDomainObjPrivatePtr priv)
job->phase = 0;
job->mask = DEFAULT_JOB_MASK;
job->start = 0;
+ job->dump_memory_only = false;
memset(&job->info, 0, sizeof(job->info));
}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index ce52569..098349b 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -104,6 +104,7 @@ struct qemuDomainJobObj {
int phase; /* Job phase (mainly for migrations) */
unsigned long long mask; /* Jobs allowed during async job */
unsigned long long start; /* When the async job started */
+ bool dump_memory_only; /* use dump-guest-memory to do dump */
virDomainJobInfo info; /* Async job progress data */
};
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index c3555ca..779304f 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -2967,12 +2967,33 @@ cleanup:
return ret;
}
+static int qemuDumpToFd(struct qemud_driver *driver, virDomainObjPtr vm,
+ int fd, enum qemuDomainAsyncJob asyncJob)
+{
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ int ret = -1;
+
+ if (virSecurityManagerSetImageFDLabel(driver->securityManager, vm->def,
+ fd) < 0)
+ return -1;
+
+ priv->job.dump_memory_only = true;
+
+ if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
+ return -1;
+
+ ret = qemuMonitorDumpToFd(priv->mon, 0, fd, 0, 0);
+ qemuDomainObjExitMonitorWithDriver(driver, vm);
+
+ return ret;
+}
+
static int
doCoreDump(struct qemud_driver *driver,
virDomainObjPtr vm,
const char *path,
enum qemud_save_formats compress,
- bool bypass_cache)
+ unsigned int dump_flags)
{
int fd = -1;
int ret = -1;
@@ -2981,7 +3002,7 @@ doCoreDump(struct qemud_driver *driver,
unsigned int flags = VIR_FILE_WRAPPER_NON_BLOCKING;
/* Create an empty file with appropriate ownership. */
- if (bypass_cache) {
+ if (dump_flags & VIR_DUMP_BYPASS_CACHE) {
flags |= VIR_FILE_WRAPPER_BYPASS_CACHE;
directFlag = virFileDirectFdFlag();
if (directFlag < 0) {
@@ -3001,14 +3022,20 @@ doCoreDump(struct qemud_driver *driver,
if (!(wrapperFd = virFileWrapperFdNew(&fd, path, flags)))
goto cleanup;
- if (qemuMigrationToFile(driver, vm, fd, 0, path,
- qemuCompressProgramName(compress), false,
- QEMU_ASYNC_JOB_DUMP) < 0)
+ if (dump_flags & VIR_DUMP_MEMORY_ONLY) {
+ ret = qemuDumpToFd(driver, vm, fd, QEMU_ASYNC_JOB_DUMP);
+ } else {
+ ret = qemuMigrationToFile(driver, vm, fd, 0, path,
+ qemuCompressProgramName(compress), false,
+ QEMU_ASYNC_JOB_DUMP);
+ }
+
+ if (ret < 0)
goto cleanup;
if (VIR_CLOSE(fd) < 0) {
virReportSystemError(errno,
- _("unable to save file %s"),
+ _("unable to close file %s"),
path);
goto cleanup;
}
@@ -3066,7 +3093,8 @@ static int qemudDomainCoreDump(virDomainPtr dom,
virDomainEventPtr event = NULL;
virCheckFlags(VIR_DUMP_LIVE | VIR_DUMP_CRASH |
- VIR_DUMP_BYPASS_CACHE | VIR_DUMP_RESET, -1);
+ VIR_DUMP_BYPASS_CACHE | VIR_DUMP_RESET |
+ VIR_DUMP_MEMORY_ONLY, -1);
qemuDriverLock(driver);
vm = virDomainFindByUUID(&driver->domains, dom->uuid);
@@ -3108,8 +3136,7 @@ static int qemudDomainCoreDump(virDomainPtr dom,
}
}
- ret = doCoreDump(driver, vm, path, getCompressionType(driver),
- (flags & VIR_DUMP_BYPASS_CACHE) != 0);
+ ret = doCoreDump(driver, vm, path, getCompressionType(driver), flags);
if (ret < 0)
goto endjob;
@@ -3270,6 +3297,7 @@ static void processWatchdogEvent(void *data, void *opaque)
case VIR_DOMAIN_WATCHDOG_ACTION_DUMP:
{
char *dumpfile;
+ unsigned int flags = 0;
if (virAsprintf(&dumpfile, "%s/%s-%u",
driver->autoDumpPath,
@@ -3292,9 +3320,9 @@ static void processWatchdogEvent(void *data, void *opaque)
goto endjob;
}
+ flags |= driver->autoDumpBypassCache ? VIR_DUMP_BYPASS_CACHE: 0;
ret = doCoreDump(driver, wdEvent->vm, dumpfile,
- getCompressionType(driver),
- driver->autoDumpBypassCache);
+ getCompressionType(driver), flags);
if (ret < 0)
qemuReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("Dump failed"));
@@ -9349,7 +9377,7 @@ static int qemuDomainGetJobInfo(virDomainPtr dom,
priv = vm->privateData;
if (virDomainObjIsActive(vm)) {
- if (priv->job.asyncJob) {
+ if (priv->job.asyncJob && !priv->job.dump_memory_only) {
memcpy(info, &priv->job.info, sizeof(*info));
/* Refresh elapsed time again just to ensure it
@@ -9407,7 +9435,7 @@ static int qemuDomainAbortJob(virDomainPtr dom) {
priv = vm->privateData;
- if (!priv->job.asyncJob) {
+ if (!priv->job.asyncJob || priv->job.dump_memory_only) {
qemuReportError(VIR_ERR_OPERATION_INVALID,
"%s", _("no job is active on the domain"));
goto endjob;
--
1.7.1
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