Re: [PATCH v9 0/2] LoongArch: KVM: Add DMSINTC support irqchip in kernel

[Huacai Chen]

Hi, Song,

On Thu, Apr 2, 2026 at 9:08 PM Song Gao <gaosong@xxxxxxxxxxx> wrote:
>
> Hi,
>
> This series  implements the DMSINTC in-kernel irqchip device,
> enables irqfd to deliver MSI to DMSINTC, and supports injecting MSI interrupts
> to the target vCPU.
> applied this series.  use netperf test.
> VM with one CPU and start netserver, host run netperf.
> disable dmsintc
> taskset 0x2f  netperf -H 192.168.122.204 -t UDP_RR  -l 36000
> Local /Remote
> Socket Size   Request  Resp.   Elapsed  Trans.
> Send   Recv   Size     Size    Time     Rate
> bytes  Bytes  bytes    bytes   secs.    per sec
>
> 212992 212992 1        1       36000.00   27107.36
>
> enable dmsintc
> Local /Remote
> Socket Size   Request  Resp.   Elapsed  Trans.
> Send   Recv   Size     Size    Time     Rate
> bytes  Bytes  bytes    bytes   secs.    per sec
>
> 212992 212992 1        1       36000.00   28831.14  (+6.3%)
>
> v9:
>  *Correct the incorrect parameter type and remove the function prefix;
>  *Fix a boundary value check.
It seems your V9 is changed from V7 rather than V8, why?

Huacai

>
> v8:
>   *Move dmsintc_inject_irq(),dmsintc_deliver_msi_to_vcpu()and
> dmsintc_set_msi_irq to dmsintc.c.
>   *Rebase.
>
> v7:
>   *Rebase;
>   *Fix a typo error;
>   *Drop an extra space;
>   *Move some code from patch2 to patch1.
>   *Rename loongarch_dmsintc_inject_irq() to dmsintc_inject_irq() and move
> it to interrupt.c;
>   *Rename kvm_loongarch_deliver_msi_to_vcpu() to
> dmsintc_deliver_msi_to_vcpu() and move it to irqfd.c;
>   *Drop loongarch_set_msi() and dispatch the dmsintc/eiointc
> paths in pch_msi_set_irq().
>
> v6:
>   Fix kvm_device leak in kvm_dmsintc_destroy().
>
> v5:
>   Combine patch2 and patch3
>   Add check msgint feature when register DMSINT device.
>
> V4: Rebase and R-b;
>    replace DINTC to DMSINTC.
>
> V3: Fix kvm_arch_set_irq_inatomic() missing dmsintc set msi.(patch3)
>
> V2:
> https://patchew.org/linux/20251128091125.2720148-1-gaosong@xxxxxxxxxxx/
>
> Thanks.
> Song Gao
>
>
> Song Gao (2):
>   LoongArch: KVM: Add DMSINTC device support
>   LoongArch: KVM: Add dmsintc inject msi to the dest vcpu
>
>  arch/loongarch/include/asm/kvm_dmsintc.h |  23 +++++
>  arch/loongarch/include/asm/kvm_host.h    |   3 +
>  arch/loongarch/include/asm/kvm_pch_pic.h |   4 +-
>  arch/loongarch/include/uapi/asm/kvm.h    |   4 +
>  arch/loongarch/kvm/Makefile              |   1 +
>  arch/loongarch/kvm/intc/dmsintc.c        | 117 +++++++++++++++++++++++
>  arch/loongarch/kvm/intc/pch_pic.c        |  15 ++-
>  arch/loongarch/kvm/interrupt.c           |  37 +++++++
>  arch/loongarch/kvm/irqfd.c               |  48 ++++++++--
>  arch/loongarch/kvm/main.c                |   6 ++
>  include/uapi/linux/kvm.h                 |   2 +
>  11 files changed, 251 insertions(+), 9 deletions(-)
>  create mode 100644 arch/loongarch/include/asm/kvm_dmsintc.h
>  create mode 100644 arch/loongarch/kvm/intc/dmsintc.c
>
> --
> 2.39.3
>