From: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> RMM provides the maximum vector length it supports for a guest in its feature register. Make it visible to the rest of KVM and to userspace via KVM_REG_ARM64_SVE_VLS. Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> Signed-off-by: Steven Price <steven.price@xxxxxxx> --- arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/include/asm/kvm_rme.h | 1 + arch/arm64/kvm/guest.c | 2 +- arch/arm64/kvm/reset.c | 12 ++++++++++-- arch/arm64/kvm/rme.c | 6 ++++++ 5 files changed, 19 insertions(+), 4 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index f7ac40ce0caf..902923402f6e 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -76,8 +76,8 @@ static inline enum kvm_mode kvm_get_mode(void) { return KVM_MODE_NONE; }; DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use); -extern unsigned int __ro_after_init kvm_sve_max_vl; int __init kvm_arm_init_sve(void); +unsigned int kvm_sve_get_max_vl(struct kvm *kvm); u32 __attribute_const__ kvm_target_cpu(void); void kvm_reset_vcpu(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_rme.h index 9c00bcb018f8..be24be001aaa 100644 --- a/arch/arm64/include/asm/kvm_rme.h +++ b/arch/arm64/include/asm/kvm_rme.h @@ -89,6 +89,7 @@ struct realm_rec { int kvm_init_rme(void); u32 kvm_realm_ipa_limit(void); u8 kvm_realm_max_pmu_counters(void); +unsigned int kvm_realm_sve_max_vl(void); u64 kvm_realm_reset_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, u64 val); bool kvm_rme_supports_sve(void); diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index f9a47ce71a26..c62fda66cdc5 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -355,7 +355,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) if (vq_present(vqs, vq)) max_vq = vq; - if (max_vq > sve_vq_from_vl(kvm_sve_max_vl)) + if (max_vq > sve_vq_from_vl(kvm_sve_get_max_vl(vcpu->kvm))) return -EINVAL; /* diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 6e6eb4a15095..a90b7c2d35bb 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -45,7 +45,7 @@ static u32 __ro_after_init kvm_ipa_limit; #define VCPU_RESET_PSTATE_SVC (PSR_AA32_MODE_SVC | PSR_AA32_A_BIT | \ PSR_AA32_I_BIT | PSR_AA32_F_BIT) -unsigned int __ro_after_init kvm_sve_max_vl; +static unsigned int __ro_after_init kvm_sve_max_vl; int __init kvm_arm_init_sve(void) { @@ -73,9 +73,17 @@ int __init kvm_arm_init_sve(void) return 0; } +unsigned int kvm_sve_get_max_vl(struct kvm *kvm) +{ + if (kvm_is_realm(kvm)) + return kvm_realm_sve_max_vl(); + else + return kvm_sve_max_vl; +} + static void kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu) { - vcpu->arch.sve_max_vl = kvm_sve_max_vl; + vcpu->arch.sve_max_vl = kvm_sve_get_max_vl(vcpu->kvm); /* * Userspace can still customize the vector lengths by writing diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c index 1bd97e206846..cd5b74aac092 100644 --- a/arch/arm64/kvm/rme.c +++ b/arch/arm64/kvm/rme.c @@ -276,6 +276,12 @@ u8 kvm_realm_max_pmu_counters(void) return u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_PMU_NUM_CTRS); } +unsigned int kvm_realm_sve_max_vl(void) +{ + return sve_vl_from_vq(u64_get_bits(rmm_feat_reg0, + RMI_FEATURE_REGISTER_0_SVE_VL) + 1); +} + u64 kvm_realm_reset_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, u64 val) { u32 bps = u64_get_bits(rmm_feat_reg0, RMI_FEATURE_REGISTER_0_NUM_BPS); -- 2.34.1