[systemd-devel] [PATCH 3/3] ARM: detect-virt: detect QEMU/KVM

Andrew Jones drjones at redhat.com
Mon Mar 30 12:15:55 PDT 2015

QEMU/KVM guests do not have hypervisor nodes, but they do have
fw-cfg nodes (since qemu v2.3.0-rc0). fw-cfg nodes are documented,
see kernel doc Documentation/devicetree/bindings/arm/fw-cfg.txt,
and therefore we should be able to rely on it in this detection.

Unfortunately, we currently don't have enough information in the
DT, or elsewhere, to determine if we're using KVM acceleration
with QEMU or not, so we can only report 'qemu' at this time, even
if KVM is in use. This shouldn't really matter in practice though,
because if detect-virt is used interactively it will be clear to
the user whether or not KVM acceleration is present by the overall
speed of the guest. If used by a script, then the script's behavior
should not change whether it's 'qemu' or 'kvm'. QEMU emulated
guests and QEMU/KVM guests of the same type should behave
identically, only the speed at which they run should differ.

 src/shared/virt.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/shared/virt.c b/src/shared/virt.c
index 712523210d720..ddb76687975ba 100644
--- a/src/shared/virt.c
+++ b/src/shared/virt.c
@@ -115,6 +115,20 @@ static int detect_vm_devicetree(const char **_id) {
                         *_id = "xen";
                         return 1;
+        } else if (r == -ENOENT) {
+                _cleanup_closedir_ DIR *dir = NULL;
+                struct dirent *dent;
+                dir = opendir("/proc/device-tree");
+                if (!dir)
+                        return 0;
+                for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+                        if (strstr(dent->d_name, "fw-cfg")) {
+                                *_id = "qemu";
+                                return 1;
+                        }
+                }
         return 0;

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