diff options
| -rw-r--r-- | arch/loongarch/kvm/vcpu.c | 42 |
1 files changed, 20 insertions, 22 deletions
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 98c4290af9c4..36106922b5d7 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -305,20 +305,16 @@ static int _kvm_get_cpucfg_mask(int id, u64 *v) switch (id) { case 2: - /* Return CPUCFG2 features which have been supported by KVM */ + /* CPUCFG2 features unconditionally supported by KVM */ *v = CPUCFG2_FP | CPUCFG2_FPSP | CPUCFG2_FPDP | CPUCFG2_FPVERS | CPUCFG2_LLFTP | CPUCFG2_LLFTPREV | CPUCFG2_LAM; /* - * If LSX is supported by CPU, it is also supported by KVM, - * as we implement it. + * For the ISA extensions listed below, if one is supported + * by the host, then it is also supported by KVM. */ if (cpu_has_lsx) *v |= CPUCFG2_LSX; - /* - * if LASX is supported by CPU, it is also supported by KVM, - * as we implement it. - */ if (cpu_has_lasx) *v |= CPUCFG2_LASX; @@ -349,24 +345,26 @@ static int kvm_check_cpucfg(int id, u64 val) switch (id) { case 2: - /* CPUCFG2 features checking */ if (!(val & CPUCFG2_LLFTP)) - /* The LLFTP must be set, as guest must has a constant timer */ - ret = -EINVAL; - else if ((val & CPUCFG2_FP) && (!(val & CPUCFG2_FPSP) || !(val & CPUCFG2_FPDP))) - /* Single and double float point must both be set when enable FP */ - ret = -EINVAL; - else if ((val & CPUCFG2_LSX) && !(val & CPUCFG2_FP)) - /* FP should be set when enable LSX */ - ret = -EINVAL; - else if ((val & CPUCFG2_LASX) && !(val & CPUCFG2_LSX)) - /* LSX, FP should be set when enable LASX, and FP has been checked before. */ - ret = -EINVAL; - break; + /* Guests must have a constant timer */ + return -EINVAL; + if ((val & CPUCFG2_FP) && (!(val & CPUCFG2_FPSP) || !(val & CPUCFG2_FPDP))) + /* Single and double float point must both be set when FP is enabled */ + return -EINVAL; + if ((val & CPUCFG2_LSX) && !(val & CPUCFG2_FP)) + /* LSX architecturally implies FP but val does not satisfy that */ + return -EINVAL; + if ((val & CPUCFG2_LASX) && !(val & CPUCFG2_LSX)) + /* LASX architecturally implies LSX and FP but val does not satisfy that */ + return -EINVAL; + return 0; default: - break; + /* + * Values for the other CPUCFG IDs are not being further validated + * besides the mask check above. + */ + return 0; } - return ret; } static int kvm_get_one_reg(struct kvm_vcpu *vcpu, |