On Tue, 01 Apr 2025 09:34:39 -0700, Sean Christopherson wrote:
> Optimizing KVM's PIR harvesting using the same techniques as posted MSIs,
> most notably to use 8-byte accesses on 64-bit kernels (/facepalm).
>
> Fix a few warts along the way, and finish up by adding a helper to dedup
> the PIR harvesting code between KVM and posted MSIs.
>
> v2:
> - Collect a review. [tglx]
> - Use an "unsigned long" with a bitwise-OR to gather PIR. [tglx]
>
> [...]
Applied to kvm-x86 pir.
Thomas and other x86 maintainers, please holler if you object to taking this
through KVM (x86), or to any of the patches. I want to start getting coverage
in -next, and deliberately put this in its own topic branch so I can rewrite or
drop things as needed.
[1/8] x86/irq: Ensure initial PIR loads are performed exactly once
https://github.com/kvm-x86/linux/commit/600e9606046a
[2/8] x86/irq: Track if IRQ was found in PIR during initial loop (to load PIR vals)
https://github.com/kvm-x86/linux/commit/3cdb8261504c
[3/8] KVM: VMX: Ensure vIRR isn't reloaded at odd times when sync'ing PIR
https://github.com/kvm-x86/linux/commit/6433fc01f9f1
[4/8] x86/irq: KVM: Track PIR bitmap as an "unsigned long" array
https://github.com/kvm-x86/linux/commit/f1459315f4d2
[5/8] KVM: VMX: Process PIR using 64-bit accesses on 64-bit kernels
https://github.com/kvm-x86/linux/commit/06b4d0ea226c
[6/8] KVM: VMX: Isolate pure loads from atomic XCHG when processing PIR
https://github.com/kvm-x86/linux/commit/b41f8638b9d3
[7/8] KVM: VMX: Use arch_xchg() when processing PIR to avoid instrumentation
https://github.com/kvm-x86/linux/commit/baf68a0e3bd6
[8/8] x86/irq: KVM: Add helper for harvesting PIR to deduplicate KVM and posted MSIs
https://github.com/kvm-x86/linux/commit/edaf3eded386
--
https://github.com/kvm-x86/linux/tree/next
