kvm: RSEQ: Add RSEQ support #12260
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kvm: RSEQ: Add RSEQ support #12260
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This change adds RSEQ support for platform/kvm. To support this, the KVM platform must provide two key capabilities: (1) A stable, unique CPU ID. (2) A way to detect when a thread as been preempted. This implementation provides the necessary support as follows: CPU ID: - platform/kvm now advertises the KVM vCPU ID as the cpu_id Preemption Detection: - Compares the last context the CPU ran against the current context being scheduled. - Compares the context's rseqCPU and CPU ID retrieved by the platform To facilitate this, several new methods are introduced to the platform interface and implemented by platform/kvm: - HasCpuNumbers() - NumCPUs() - DetectsCPUPreemption() - PreemptCpu() - PreemptAllCpus() PiperOrigin-RevId: 823228013
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kvm: RSEQ: Add RSEQ support
This change adds RSEQ support for platform/kvm.
To support this, the KVM platform must provide two key capabilities:
(1) A stable, unique CPU ID.
(2) A way to detect when a thread as been preempted.
This implementation provides the necessary support as follows:
CPU ID:
Preemption Detection:
scheduled.
To facilitate this, several new methods are introduced to the platform
interface and implemented by platform/kvm: