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933e5288fa
This change allows KVM to check for pending PPI interrupts. This has two main components: First of all, the effective priority mask is calculated. This is a combination of the priority mask in the VPEs ICC_PCR_EL1.PRIORITY and the currently running priority as determined from the VPE's ICH_APR_EL1. If an interrupt's priority is greater than or equal to the effective priority mask, it can be signalled. Otherwise, it cannot. Secondly, any Enabled and Pending PPIs must be checked against this compound priority mask. The reqires the PPI priorities to by synced back to the KVM shadow state on WFI entry - this is skipped in general operation as it isn't required and is rather expensive. If any Enabled and Pending PPIs are of sufficient priority to be signalled, then there are pending PPIs. Else, there are not. This ensures that a VPE is not woken when it cannot actually process the pending interrupts. As the PPI priorities are not synced back to the KVM shadow state on every guest exit, they must by synced prior to checking if there are pending interrupts for the guest. The sync itself happens in vgic_v5_put() if, and only if, the vcpu is entering WFI as this is the only case where it is not planned to run the vcpu thread again. If the vcpu enters WFI, the vcpu thread will be descheduled and won't be rescheduled again until it has a pending interrupt, which is checked from kvm_arch_vcpu_runnable(). Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com> Reviewed-by: Joey Gouly <joey.gouly@arm.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Link: https://patch.msgid.link/20260319154937.3619520-24-sascha.bischoff@arm.com Signed-off-by: Marc Zyngier <maz@kernel.org> |
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Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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