linux-kernel - [PATCH v6 0/8] LoongArch: KVM: Enhancement with eiointc emulation

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Message-Id: <20250709080233.3948503-1-maobibo@loongson.cn>
Date: Wed,  9 Jul 2025 16:02:25 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>,
	Xianglai Li <lixianglai@...ngson.cn>
Cc: kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v6 0/8] LoongArch: KVM: Enhancement with eiointc emulation

This series add generic eiointc 8 bytes access interface, so that 1/2/4/8
bytes access can use the generic 8 bytes access interface. It reduce
about 500 lines redundant code and make eiointc emulation driver
simpler than ever.

---
v5 ... v6:
  1. Merge previous patch 5 & 6 into one, patch 7 & 10 into into one and
     patch 12 and patch 13 into one.
  2. Use sign extension with destination register for IOCSRRD.{B/H/W}
     kernel emulation.

v4 ... v5
  1. Rebase patch on latest kernel where bugfix of eiointc has been
     merged.
  2. Add generic eiointc 8 bytes access interface, 1/2/4/8 bytes access
     uses generic 8 bytes access interface.

v3 ... v4:
  1. Remove patch about enhancement and only keep bugfix relative
     patches.
  2. Remove INTC indication in the patch title.
  3. With access size, keep default case unchanged besides 1/2/4/8 since
     here all patches are bugfix
  4. Firstly check return value of copy_from_user() with error path,
     keep the same order with old patch in patch 4.

v2 ... v3:
  1. Add prefix INTC: in title of every patch.
  2. Fix array index overflow when emulate register EIOINTC_ENABLE
     writing operation.
  3. Add address alignment check with eiointc register access operation.

v1 ... v2:
  1. Add extra fix in patch 3 and patch 4, add num_cpu validation check
  2. Name of stat information keeps unchanged, only move it from VM stat
     to vCPU stat.
---
Bibo Mao (8):
  LoongArch: KVM: Use standard bitops API with eiointc
  LoongArch: KVM: Remove unused parameter len
  LoongArch: KVM: Add stat information with kernel irqchip
  LoongArch: KVM: Remove never called default case statement
  LoongArch: KVM: Use generic function loongarch_eiointc_read()
  LoongArch: KVM: Remove some unnecessary local variables
  LoongArch: KVM: Replace eiointc_enable_irq() with eiointc_update_irq()
  LoongArch: KVM: Add generic function loongarch_eiointc_write()

 arch/loongarch/include/asm/kvm_host.h |  12 +-
 arch/loongarch/kvm/intc/eiointc.c     | 558 ++++----------------------
 arch/loongarch/kvm/intc/ipi.c         |  28 +-
 arch/loongarch/kvm/intc/pch_pic.c     |   4 +-
 arch/loongarch/kvm/vcpu.c             |   8 +-
 5 files changed, 102 insertions(+), 508 deletions(-)


base-commit: 733923397fd95405a48f165c9b1fbc8c4b0a4681
-- 
2.39.3