Hi, Bibo, Any update on this? Huacai On Wed, Nov 13, 2024 at 11:17 AM Bibo Mao <maobibo@xxxxxxxxxxx> 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 >
