[Bug 1967894] Re: KVM IPI Virtualization support for SPR

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1967894

Title:
KVM IPI Virtualization support for SPR

Status in linux package in Ubuntu:
Expired

Bug description:
IPI virtualization targets to make the processor emulate the write to APIC registers that would send IPIs in virtualized system.
VMX provide new VM-execution control and VMCS field to support IPI virtualization which can eliminate APIC-Write VM-exit.
The processor sets the bit corresponding to the vector in target vCPU's PIR and may send a notification (IPI) specified by NDST
and NV fields in target vCPU's PID. It is similar to what IOMMU engine does when dealing with posted interrupt from devices.

IPI Virtualization is approved in SPR/EGS CCB and  it is supposed to
be enabled in C-step or later (perhaps D-step).


Subject: Re: [PATCH v7 8/8] KVM: VMX: enable IPI virtualization
https://lore.kernel.org/kvm/54df6da8-ad68-cc75-48db-d18fc87430e9@intel.com/

Target Linux 5.18

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