[libvirt] [PATCH v3 1/4] virutil: Introduce virHostHasIOMMU
---
src/conf/capabilities.c | 6 ++++++
src/conf/capabilities.h | 3 +++
src/util/virutil.c | 28 ++++++++++++++++++++++++++++
src/util/virutil.h | 2 ++
4 files changed, 39 insertions(+)
diff --git a/src/conf/capabilities.c b/src/conf/capabilities.c
index dd2fc77f91..ba19d5db8c 100644
--- a/src/conf/capabilities.c
+++ b/src/conf/capabilities.c
@@ -1743,3 +1743,9 @@ virCapabilitiesInitCaches(virCapsPtr caps)
virBitmapFree(cpus);
return ret;
}
+
+void
+virCapabilitiesHostInitIOMMU(virCapsPtr caps)
+{
+ caps->host.iommu = virHostHasIOMMU();
+}
diff --git a/src/conf/capabilities.h b/src/conf/capabilities.h
index f0a06a24df..fe1b9ea455 100644
--- a/src/conf/capabilities.h
+++ b/src/conf/capabilities.h
@@ -183,6 +183,7 @@ struct _virCapsHost {
int nPagesSize; /* size of pagesSize array */
unsigned int *pagesSize; /* page sizes support on the system */
unsigned char host_uuid[VIR_UUID_BUFLEN];
+ bool iommu;
};
typedef int (*virDomainDefNamespaceParse)(xmlDocPtr, xmlNodePtr,
@@ -327,4 +328,6 @@ void virCapsHostCacheBankFree(virCapsHostCacheBankPtr ptr);
int virCapabilitiesInitCaches(virCapsPtr caps);
+void virCapabilitiesHostInitIOMMU(virCapsPtr caps);
+
#endif /* __VIR_CAPABILITIES_H */
diff --git a/src/util/virutil.c b/src/util/virutil.c
index bb4474acd5..7edcda0ee7 100644
--- a/src/util/virutil.c
+++ b/src/util/virutil.c
@@ -2090,3 +2090,31 @@ virMemoryMaxValue(bool capped)
else
return LLONG_MAX;
}
+
+bool
+virHostHasIOMMU(void)
+{
+ DIR *iommuDir = NULL;
+ struct dirent *iommuGroup = NULL;
+ bool ret = false;
+ int direrr;
+
+ /* condition 1 - /sys/kernel/iommu_groups/ contains entries */
+ if (virDirOpenQuiet(&iommuDir, "/sys/kernel/iommu_groups/") < 0)
+ goto cleanup;
+
+ while ((direrr = virDirRead(iommuDir, &iommuGroup, NULL)) > 0) {
+ /* assume we found a group */
+ break;
+ }
+
+ if (direrr < 0 || !iommuGroup)
+ goto cleanup;
+ /* okay, iommu is on and recognizes groups */
+
+ ret = true;
+
+ cleanup:
+ VIR_DIR_CLOSE(iommuDir);
+ return ret;
+}
diff --git a/src/util/virutil.h b/src/util/virutil.h
index be0f6b0ea8..1ba9635bd9 100644
--- a/src/util/virutil.h
+++ b/src/util/virutil.h
@@ -216,6 +216,8 @@ unsigned long long virMemoryLimitTruncate(unsigned long long value);
bool virMemoryLimitIsSet(unsigned long long value);
unsigned long long virMemoryMaxValue(bool ulong) ATTRIBUTE_NOINLINE;
+bool virHostHasIOMMU(void);
+
/**
* VIR_ASSIGN_IS_OVERFLOW:
* @rvalue: value that is checked (evaluated twice)
--
2.17.0