diff options
authorErwan Velu <>2020-02-27 19:00:46 +0100
committerPaolo Bonzini <>2020-02-28 11:37:20 +0100
commitef935c25fd648a17c27af5d1738b1884f78c5b75 (patch)
parentaaec7c03de92c35a96966631989950e6e27662db (diff)
kvm: x86: Limit the number of "kvm: disabled by bios" messages
In older version of systemd(219), at boot time, udevadm is called with : /usr/bin/udevadm trigger --type=devices --action=add" This program generates an echo "add" in /sys/devices/system/cpu/cpu<x>/uevent, leading to the "kvm: disabled by bios" message in case of your Bios disabled the virtualization extensions. On a modern system running up to 256 CPU threads, this pollutes the Kernel logs. This patch offers to ratelimit this message to avoid any userspace program triggering this uevent printing this message too often. This patch is only a workaround but greatly reduce the pollution without breaking the current behavior of printing a message if some try to instantiate KVM on a system that doesn't support it. Note that recent versions of systemd (>239) do not have trigger this behavior. This patch will be useful at least for some using older systemd with recent Kernels. Signed-off-by: Erwan Velu <> Signed-off-by: Paolo Bonzini <>
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bcb6b676608b..5de200663f51 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7308,12 +7308,12 @@ int kvm_arch_init(void *opaque)
if (!ops->cpu_has_kvm_support()) {
- printk(KERN_ERR "kvm: no hardware support\n");
+ pr_err_ratelimited("kvm: no hardware support\n");
goto out;
if (ops->disabled_by_bios()) {
- printk(KERN_ERR "kvm: disabled by bios\n");
+ pr_err_ratelimited("kvm: disabled by bios\n");
goto out;