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LoongArch: KVM: Add vm migration support for LBT registers

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Every vcpu has separate LBT registers. And there are four scr registers,
one flags and ftop register for LBT extension. When VM migrates, VMM
needs to get LBT registers for every vcpu.

Here macro KVM_REG_LOONGARCH_LBT is added for new vcpu lbt register type,
the following macro is added to get/put LBT registers.
  KVM_REG_LOONGARCH_LBT_SCR0
  KVM_REG_LOONGARCH_LBT_SCR1
  KVM_REG_LOONGARCH_LBT_SCR2
  KVM_REG_LOONGARCH_LBT_SCR3
  KVM_REG_LOONGARCH_LBT_EFLAGS
  KVM_REG_LOONGARCH_LBT_FTOP

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao
2024-09-11 23:26:32 +08:00
committed by Huacai Chen
parent b67ee19a90
commit acc7f20d54
2 changed files with 65 additions and 0 deletions
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56
arch/loongarch/kvm/vcpu.c
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@@ -584,6 +584,34 @@ static int kvm_get_one_reg(struct kvm_vcpu *vcpu,
else
ret = -EINVAL;
break;
case KVM_REG_LOONGARCH_LBT:
if (!kvm_guest_has_lbt(&vcpu->arch))
return -ENXIO;
switch (reg->id) {
case KVM_REG_LOONGARCH_LBT_SCR0:
*v = vcpu->arch.lbt.scr0;
break;
case KVM_REG_LOONGARCH_LBT_SCR1:
*v = vcpu->arch.lbt.scr1;
break;
case KVM_REG_LOONGARCH_LBT_SCR2:
*v = vcpu->arch.lbt.scr2;
break;
case KVM_REG_LOONGARCH_LBT_SCR3:
*v = vcpu->arch.lbt.scr3;
break;
case KVM_REG_LOONGARCH_LBT_EFLAGS:
*v = vcpu->arch.lbt.eflags;
break;
case KVM_REG_LOONGARCH_LBT_FTOP:
*v = vcpu->arch.fpu.ftop;
break;
default:
ret = -EINVAL;
break;
}
break;
case KVM_REG_LOONGARCH_KVM:
switch (reg->id) {
case KVM_REG_LOONGARCH_COUNTER:
@@ -643,6 +671,34 @@ static int kvm_set_one_reg(struct kvm_vcpu *vcpu,
break;
vcpu->arch.cpucfg[id] = (u32)v;
break;
case KVM_REG_LOONGARCH_LBT:
if (!kvm_guest_has_lbt(&vcpu->arch))
return -ENXIO;
switch (reg->id) {
case KVM_REG_LOONGARCH_LBT_SCR0:
vcpu->arch.lbt.scr0 = v;
break;
case KVM_REG_LOONGARCH_LBT_SCR1:
vcpu->arch.lbt.scr1 = v;
break;
case KVM_REG_LOONGARCH_LBT_SCR2:
vcpu->arch.lbt.scr2 = v;
break;
case KVM_REG_LOONGARCH_LBT_SCR3:
vcpu->arch.lbt.scr3 = v;
break;
case KVM_REG_LOONGARCH_LBT_EFLAGS:
vcpu->arch.lbt.eflags = v;
break;
case KVM_REG_LOONGARCH_LBT_FTOP:
vcpu->arch.fpu.ftop = v;
break;
default:
ret = -EINVAL;
break;
}
break;
case KVM_REG_LOONGARCH_KVM:
switch (reg->id) {
case KVM_REG_LOONGARCH_COUNTER: