Messages in this thread | | | Date | Sun, 13 Oct 2013 13:38:57 +0530 | From | Raghavendra K T <> | Subject | Re: [PATCH] kvm fix: Enable pvspinlock after jump_label_init() to avoid VM hang |
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On 10/09/2013 02:33 PM, Raghavendra K T wrote: > We use jump label to enable pv-spinlock. With the changes in > (442e0973e927 Merge branch 'x86/jumplabel'), the jump label behaviour has changed > that would result in evntual hang of the VM since we would end up in a situation > where slowpath locks would halt the vcpus but we will not be able to wakeup the > vcpu by lock releaser using unlock kick. > > Similar problem in Xen and more detailed description is available in > a945928ea270 (xen: Do not enable spinlocks before jump_label_init() has executed) > > This patch splits kvm_spinlock_init to separate jump label changes with pvops > patching and also make jump label enabling after jump_label_init(). > > Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Ingo, Could you please take this fix? This is reviewed by Paolo and Steven.
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