linux-kernel - [PATCH v4 0/3] LongArch: KVM: Add DMSINTC support irqchip in kernel

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Message-Id: <20251218111822.975455-1-gaosong@loongson.cn>
Date: Thu, 18 Dec 2025 19:18:19 +0800
From: Song Gao <gaosong@...ngson.cn>
To: maobibo@...ngson.cn,
	chenhuacai@...nel.org
Cc: kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	kernel@...0n.name,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/3] LongArch: KVM: Add DMSINTC support irqchip in kernel

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%)

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@loongson.cn/

Thanks.
Song Gao

Song Gao (3):
  LongArch: KVM: Add DMSINTC device support
  LongArch: KVM: Add irqfd set dmsintc msg irq
  LongArch: KVM: Add dmsintc inject msi to the dest vcpu

 arch/loongarch/include/asm/kvm_dmsintc.h |  22 +++++
 arch/loongarch/include/asm/kvm_host.h    |   8 ++
 arch/loongarch/include/uapi/asm/kvm.h    |   4 +
 arch/loongarch/kvm/Makefile              |   1 +
 arch/loongarch/kvm/intc/dmsintc.c        | 116 +++++++++++++++++++++++
 arch/loongarch/kvm/interrupt.c           |   1 +
 arch/loongarch/kvm/irqfd.c               |  45 +++++++--
 arch/loongarch/kvm/main.c                |   5 +
 arch/loongarch/kvm/vcpu.c                |  58 ++++++++++++
 include/uapi/linux/kvm.h                 |   2 +
 10 files changed, 255 insertions(+), 7 deletions(-)
 create mode 100644 arch/loongarch/include/asm/kvm_dmsintc.h
 create mode 100644 arch/loongarch/kvm/intc/dmsintc.c

-- 
2.39.3