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qemu: Introduce qemuGetHupageMemPath

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Now that we have two same implementations for getting path for
huge pages backed guest memory, lets merge them into one function.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Michal Privoznik 2016-09-19 07:45:12 +02:00
parent 647db05e9a
commit eef8b26372
3 changed files with 59 additions and 58 deletions
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63
src/qemu/qemu_command.c
View File

@ -3275,35 +3275,9 @@ qemuBuildMemoryBackendStr(unsigned long long size,
if (!(props = virJSONValueNewObject()))
return -1;
if (pagesize || hugepage) {
if (pagesize) {
/* Now lets see, if the huge page we want to use is even mounted
* and ready to use */
for (i = 0; i < cfg->nhugetlbfs; i++) {
if (cfg->hugetlbfs[i].size == pagesize)
break;
}
if (i == cfg->nhugetlbfs) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to find any usable hugetlbfs mount for %llu KiB"),
pagesize);
goto cleanup;
}
if (!(mem_path = qemuGetHugepagePath(&cfg->hugetlbfs[i])))
goto cleanup;
} else {
if (!cfg->nhugetlbfs) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("hugetlbfs filesystem is not mounted "
"or disabled by administrator config"));
goto cleanup;
}
if (!(mem_path = qemuGetDefaultHugepath(cfg->hugetlbfs,
cfg->nhugetlbfs)))
goto cleanup;
}
if (pagesize) {
if (qemuGetHupageMemPath(cfg, pagesize, &mem_path) < 0)
goto cleanup;
*backendType = "memory-backend-file";
@ -7272,7 +7246,6 @@ qemuBuildMemPathStr(virQEMUDriverConfigPtr cfg,
{
const long system_page_size = virGetSystemPageSizeKB();
char *mem_path = NULL;
size_t i = 0;
/*
* No-op if hugepages were not requested.
@ -7287,13 +7260,6 @@ qemuBuildMemPathStr(virQEMUDriverConfigPtr cfg,
if (def->mem.hugepages[0].size == system_page_size)
return 0;
if (!cfg->nhugetlbfs) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("hugetlbfs filesystem is not mounted "
"or disabled by administrator config"));
return -1;
}
if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_MEM_PATH)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("hugepage backing not supported by '%s'"),
@ -7301,27 +7267,8 @@ qemuBuildMemPathStr(virQEMUDriverConfigPtr cfg,
return -1;
}
if (!def->mem.hugepages[0].size) {
if (!(mem_path = qemuGetDefaultHugepath(cfg->hugetlbfs,
cfg->nhugetlbfs)))
return -1;
} else {
for (i = 0; i < cfg->nhugetlbfs; i++) {
if (cfg->hugetlbfs[i].size == def->mem.hugepages[0].size)
break;
}
if (i == cfg->nhugetlbfs) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to find any usable hugetlbfs "
"mount for %llu KiB"),
def->mem.hugepages[0].size);
return -1;
}
if (!(mem_path = qemuGetHugepagePath(&cfg->hugetlbfs[i])))
return -1;
}
if (qemuGetHupageMemPath(cfg, def->mem.hugepages[0].size, &mem_path) < 0)
return -1;
virCommandAddArgList(cmd, "-mem-prealloc", "-mem-path", mem_path, NULL);
VIR_FREE(mem_path);

50
src/qemu/qemu_conf.c
View File

@ -1475,3 +1475,53 @@ qemuGetDefaultHugepath(virHugeTLBFSPtr hugetlbfs,
return qemuGetHugepagePath(&hugetlbfs[i]);
}
/**
* qemuGetHupageMemPath: Construct HP enabled memory backend path
*
* If no specific hugepage size is requested (@pagesize is zero)
* the default hugepage size is used).
* The resulting path is stored at @memPath.
*
* Returns 0 on success,
* -1 otherwise.
*/
int
qemuGetHupageMemPath(virQEMUDriverConfigPtr cfg,
unsigned long long pagesize,
char **memPath)
{
size_t i = 0;
if (!cfg->nhugetlbfs) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("hugetlbfs filesystem is not mounted "
"or disabled by administrator config"));
return -1;
}
if (!pagesize) {
if (!(*memPath = qemuGetDefaultHugepath(cfg->hugetlbfs,
cfg->nhugetlbfs)))
return -1;
} else {
for (i = 0; i < cfg->nhugetlbfs; i++) {
if (cfg->hugetlbfs[i].size == pagesize)
break;
}
if (i == cfg->nhugetlbfs) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to find any usable hugetlbfs "
"mount for %llu KiB"),
pagesize);
return -1;
}
if (!(*memPath = qemuGetHugepagePath(&cfg->hugetlbfs[i])))
return -1;
}
return 0;
}

4
src/qemu/qemu_conf.h
View File

@ -335,4 +335,8 @@ int qemuTranslateSnapshotDiskSourcePool(virConnectPtr conn,
char * qemuGetHugepagePath(virHugeTLBFSPtr hugepage);
char * qemuGetDefaultHugepath(virHugeTLBFSPtr hugetlbfs,
size_t nhugetlbfs);
int qemuGetHupageMemPath(virQEMUDriverConfigPtr cfg,
unsigned long long pagesize,
char **memPath);
#endif /* __QEMUD_CONF_H */