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

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Message-ID: <ac42e531-26b1-0d4f-60e5-2fbb6ac92c17@loongson.cn>
Date: Mon, 6 Jan 2025 09:12:46 +0800
From: bibo mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Tianrui Zhao <zhaotianrui@...ngson.cn>, WANG Xuerui <kernel@...0n.name>,
 kvm@...r.kernel.org, loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/5] LoongArch: KVM: Add separate vmid support

Huacai,

On 2025/1/4 下午10:09, Huacai Chen wrote:
> Hi, Bibo,
> 
> Any update on this?
Sorry for not update it in time.

This patch is basic memory relative, it is only test on 3A6000 with 4 
cores. I hope it is fully tested on 3C6000 servers with numa support. 
When new machines arrive and the test is done, I will refresh the patch.

Regards
Bibo Mao
> 
> Huacai
> 
> On Wed, Nov 13, 2024 at 11:17 AM Bibo Mao <maobibo@...ngson.cn> wrote:
>>
>> 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
>>