Messages in this thread | | | From | Paolo Bonzini <> | Subject | [PATCH 0/3] KVM: Make kvm_lock non-raw | Date | Mon, 16 Sep 2013 16:06:10 +0200 |
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Paul Gortmaker reported a BUG on preempt-rt kernels, due to taking the mmu_lock within the raw kvm_lock in mmu_shrink_scan. He provided a patch that shrunk the kvm_lock critical section so that the mmu_lock critical section does not nest with it, but in the end there is no reason for the vm_list to be protected by a raw spinlock. Only manipulations of kvm_usage_count and the consequent hardware_enable/disable operations are not preemptable.
This small series thus splits the kvm_lock in the "raw" part and the "non-raw" part.
Paul, could you please provide your Tested-by?
Thanks,
Paolo
Paolo Bonzini (3): KVM: cleanup (physical) CPU hotplug KVM: protect kvm_usage_count with its own spinlock KVM: Convert kvm_lock back to non-raw spinlock
Documentation/virtual/kvm/locking.txt | 8 ++++-- arch/x86/kvm/mmu.c | 4 +-- arch/x86/kvm/x86.c | 8 +++--- include/linux/kvm_host.h | 2 +- virt/kvm/kvm_main.c | 51 ++++++++++++++++++----------------- 5 files changed, 40 insertions(+), 33 deletions(-)
-- 1.8.3.1
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