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The goal of this document shall be - overview of all locks used in KVM core - provide details on the scope of each lock - explain the lock type, specifically of a raw spin locks - provide a lock ordering guide Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
25 lines
547 B
Text
25 lines
547 B
Text
KVM Lock Overview
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=================
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1. Acquisition Orders
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---------------------
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(to be written)
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2. Reference
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------------
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Name: kvm_lock
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Type: raw_spinlock
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Arch: any
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Protects: - vm_list
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- hardware virtualization enable/disable
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Comment: 'raw' because hardware enabling/disabling must be atomic /wrt
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migration.
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Name: kvm_arch::tsc_write_lock
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Type: raw_spinlock
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Arch: x86
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Protects: - kvm_arch::{last_tsc_write,last_tsc_nsec,last_tsc_offset}
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- tsc offset in vmcb
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Comment: 'raw' because updating the tsc offsets must not be preempted.
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