| Message ID | 20230530015223.147755-17-zhaotianrui@loongson.cn (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add KVM LoongArch support | expand |
Reviewed-by: Bibo, Mao <maobibo@loongson.cn> 在 2023/5/30 09:52, Tianrui Zhao 写道: > Implement kvm check vmid and update vmid, the vmid should be checked before > vcpu enter guest. > > Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> > --- > arch/loongarch/kvm/vmid.c | 64 +++++++++++++++++++++++++++++++++++++++ > 1 file changed, 64 insertions(+) > create mode 100644 arch/loongarch/kvm/vmid.c > > diff --git a/arch/loongarch/kvm/vmid.c b/arch/loongarch/kvm/vmid.c > new file mode 100644 > index 000000000000..6fef81b28a48 > --- /dev/null > +++ b/arch/loongarch/kvm/vmid.c > @@ -0,0 +1,64 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited > + */ > + > +#include <linux/kvm_host.h> > +#include "trace.h" > + > +static void _kvm_update_vpid(struct kvm_vcpu *vcpu, int cpu) > +{ > + struct kvm_context *context; > + unsigned long vpid; > + > + context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); > + vpid = context->vpid_cache + 1; > + if (!(vpid & vpid_mask)) { > + /* finish round of 64 bit loop */ > + if (unlikely(!vpid)) > + vpid = vpid_mask + 1; > + > + /* vpid 0 reserved for root */ > + ++vpid; > + > + /* start new vpid cycle */ > + kvm_flush_tlb_all(); > + } > + > + context->vpid_cache = vpid; > + vcpu->arch.vpid = vpid; > +} > + > +void _kvm_check_vmid(struct kvm_vcpu *vcpu, int cpu) > +{ > + struct kvm_context *context; > + bool migrated; > + unsigned long ver, old, vpid; > + > + /* > + * Are we entering guest context on a different CPU to last time? > + * If so, the vCPU's guest TLB state on this CPU may be stale. > + */ > + context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); > + migrated = (vcpu->arch.last_exec_cpu != cpu); > + vcpu->arch.last_exec_cpu = cpu; > + > + /* > + * Check if our vpid is of an older version > + * > + * We also discard the stored vpid if we've executed on > + * another CPU, as the guest mappings may have changed without > + * hypervisor knowledge. > + */ > + ver = vcpu->arch.vpid & ~vpid_mask; > + old = context->vpid_cache & ~vpid_mask; > + if (migrated || (ver != old)) { > + _kvm_update_vpid(vcpu, cpu); > + trace_kvm_vpid_change(vcpu, vcpu->arch.vpid); > + } > + > + /* Restore GSTAT(0x50).vpid */ > + vpid = (vcpu->arch.vpid & vpid_mask) > + << CSR_GSTAT_GID_SHIFT; > + change_csr_gstat(vpid_mask << CSR_GSTAT_GID_SHIFT, vpid); > +}
diff --git a/arch/loongarch/kvm/vmid.c b/arch/loongarch/kvm/vmid.c new file mode 100644 index 000000000000..6fef81b28a48 --- /dev/null +++ b/arch/loongarch/kvm/vmid.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited + */ + +#include <linux/kvm_host.h> +#include "trace.h" + +static void _kvm_update_vpid(struct kvm_vcpu *vcpu, int cpu) +{ + struct kvm_context *context; + unsigned long vpid; + + context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); + vpid = context->vpid_cache + 1; + if (!(vpid & vpid_mask)) { + /* finish round of 64 bit loop */ + if (unlikely(!vpid)) + vpid = vpid_mask + 1; + + /* vpid 0 reserved for root */ + ++vpid; + + /* start new vpid cycle */ + kvm_flush_tlb_all(); + } + + context->vpid_cache = vpid; + vcpu->arch.vpid = vpid; +} + +void _kvm_check_vmid(struct kvm_vcpu *vcpu, int cpu) +{ + struct kvm_context *context; + bool migrated; + unsigned long ver, old, vpid; + + /* + * Are we entering guest context on a different CPU to last time? + * If so, the vCPU's guest TLB state on this CPU may be stale. + */ + context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu); + migrated = (vcpu->arch.last_exec_cpu != cpu); + vcpu->arch.last_exec_cpu = cpu; + + /* + * Check if our vpid is of an older version + * + * We also discard the stored vpid if we've executed on + * another CPU, as the guest mappings may have changed without + * hypervisor knowledge. + */ + ver = vcpu->arch.vpid & ~vpid_mask; + old = context->vpid_cache & ~vpid_mask; + if (migrated || (ver != old)) { + _kvm_update_vpid(vcpu, cpu); + trace_kvm_vpid_change(vcpu, vcpu->arch.vpid); + } + + /* Restore GSTAT(0x50).vpid */ + vpid = (vcpu->arch.vpid & vpid_mask) + << CSR_GSTAT_GID_SHIFT; + change_csr_gstat(vpid_mask << CSR_GSTAT_GID_SHIFT, vpid); +}
Implement kvm check vmid and update vmid, the vmid should be checked before vcpu enter guest. Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> --- arch/loongarch/kvm/vmid.c | 64 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 arch/loongarch/kvm/vmid.c