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Subject[PATCH] kvm: x86: Print "disabled by bios" only once per host
The current behavior is to print a "disabled by bios" message per CPU thread.
As modern CPUs can have up to 64 cores, 128 on a dual socket, and turns this
printk to be a pretty noisy by showing up to 256 times the same line in a row.

This patch offer to only print the message once per host considering the BIOS will
disabled the feature for all sockets/cores at once and not on a per core basis.

Signed-off-by: Erwan Velu <>
arch/x86/kvm/x86.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fbabb2f06273..8f0d7a09d453 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7300,7 +7300,7 @@ int kvm_arch_init(void *opaque)
goto out;
if (ops->disabled_by_bios()) {
- printk(KERN_ERR "kvm: disabled by bios\n");
+ printk_once(KERN_ERR "kvm: disabled by bios\n");
goto out;
 \ /
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