This is a note to let you know that I've just added the patch titled
Use WARN_ON_ONCE for missing X86_FEATURE_NRIPS
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
use-warn_on_once-for-missing-x86_feature_nrips.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d2922422c48df93f3edff7d872ee4f3191fefb08 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dirk=20M=C3=BCller?= <dmueller@xxxxxxxx>
Date: Thu, 1 Oct 2015 13:43:42 +0200
Subject: Use WARN_ON_ONCE for missing X86_FEATURE_NRIPS
From: =?UTF-8?q?Dirk=20M=C3=BCller?= <dmueller@xxxxxxxx>
commit d2922422c48df93f3edff7d872ee4f3191fefb08 upstream.
The cpu feature flags are not ever going to change, so warning
everytime can cause a lot of kernel log spam
(in our case more than 10GB/hour).
The warning seems to only occur when nested virtualization is
enabled, so it's probably triggered by a KVM bug. This is a
sensible and safe change anyway, and the KVM bug fix might not
be suitable for stable releases anyway.
Signed-off-by: Dirk Mueller <dmueller@xxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/svm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -496,7 +496,7 @@ static void skip_emulated_instruction(st
struct vcpu_svm *svm = to_svm(vcpu);
if (svm->vmcb->control.next_rip != 0) {
- WARN_ON(!static_cpu_has(X86_FEATURE_NRIPS));
+ WARN_ON_ONCE(!static_cpu_has(X86_FEATURE_NRIPS));
svm->next_rip = svm->vmcb->control.next_rip;
}
Patches currently in stable-queue which might be from dmueller@xxxxxxxx are
queue-3.14/use-warn_on_once-for-missing-x86_feature_nrips.patch
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