linux-kernel - [RFC 0/5] LoongArch: KVM: Add separate vmid support

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Message-Id: <20241113031727.2815628-1-maobibo@loongson.cn>
Date: Wed, 13 Nov 2024 11:17:22 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>
Cc: WANG Xuerui <kernel@...0n.name>,
	kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [RFC 0/5] LoongArch: KVM: Add separate vmid support

LoongArch KVM hypervisor supports two-level MMU, vpid index is used
for stage1 MMU and vmid index is used for stage2 MMU.

On 3A5000, vmid must be the same with vpid. On 3A6000 platform vmid
may separate from vpid. There are such advantages if separate vpid
is supported.
  1. One VM uses one vmid, vCPUs on the same VM can share the same vmid.
  2. If one vCPU switch between different physical CPU, old vmid can be
     still usefil if old vmid is not expired
  3. For remote tlb flush, only vmid need update and vpid need not
update.

Here add separate vmid feature support, vmid feature detecting method
is not implemented since it depends on HW implementation, detecting
method will be added when HW is ready.

---
Bibo Mao (5):
  LoongArch: KVM: Add vmid support for stage2 MMU
  LoongArch: KVM: Add separate vmid feature support
  LoongArch: KVM: implement vmid updating logic
  LoongArch: KVM: Add remote tlb flushing support
  LoongArch: KVM: Enable separate vmid feature

 arch/loongarch/include/asm/kvm_host.h  | 10 ++++
 arch/loongarch/include/asm/loongarch.h |  2 +
 arch/loongarch/kernel/asm-offsets.c    |  1 +
 arch/loongarch/kvm/main.c              | 76 ++++++++++++++++++++++++--
 arch/loongarch/kvm/mmu.c               | 17 ++++++
 arch/loongarch/kvm/switch.S            |  5 +-
 arch/loongarch/kvm/tlb.c               | 19 ++++++-
 arch/loongarch/kvm/vcpu.c              |  7 ++-
 8 files changed, 128 insertions(+), 9 deletions(-)


base-commit: 2d5404caa8c7bb5c4e0435f94b28834ae5456623
-- 
2.39.3