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V" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo Pieralisi , Steven Price Subject: [PATCH v15 33/37] KVM: arm64: CCA: Propagate max SVE vector length from the RMM Date: Wed, 15 Jul 2026 15:28:35 +0100 Message-ID: <20260715142841.80544-34-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260715142841.80544-1-steven.price@arm.com> References: <20260715142841.80544-1-steven.price@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260715_153133_539810_80CDD1D7 X-CRM114-Status: GOOD ( 13.56 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Jean-Philippe Brucker 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 Signed-off-by: Steven Price Reviewed-by: Gavin Shan Reviewed-by: Suzuki K Poulose --- arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/include/asm/kvm_rmi.h | 1 + arch/arm64/kvm/guest.c | 2 +- arch/arm64/kvm/reset.c | 12 ++++++++++-- arch/arm64/kvm/rmi.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 993ead6e6449..3542b32433b7 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -78,9 +78,9 @@ enum kvm_mode kvm_get_mode(void); static inline enum kvm_mode kvm_get_mode(void) { return KVM_MODE_NONE; }; #endif -extern unsigned int __ro_after_init kvm_sve_max_vl; extern unsigned int __ro_after_init kvm_host_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_rmi.h b/arch/arm64/include/asm/kvm_rmi.h index 3ec6525ae95f..420e99fca07e 100644 --- a/arch/arm64/include/asm/kvm_rmi.h +++ b/arch/arm64/include/asm/kvm_rmi.h @@ -95,6 +95,7 @@ struct realm_rec { void kvm_init_rmi(void); u32 kvm_rmm_ipa_limit(void); +unsigned int kvm_realm_sve_max_vl(void); u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val); diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 3ed563e85572..f48fc0d5a249 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -375,7 +375,7 @@ 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 c18cdca7d125..7b8681a602d4 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -46,7 +46,7 @@ unsigned int __ro_after_init kvm_host_sve_max_vl; #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) { @@ -76,9 +76,17 @@ 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/rmi.c b/arch/arm64/kvm/rmi.c index 6850338e2f19..cc618608f128 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -35,6 +35,12 @@ u32 kvm_rmm_ipa_limit(void) return u64_get_bits(rmi_feat_reg(0), RMI_FEATURE_REGISTER_0_S2SZ); } +unsigned int kvm_realm_sve_max_vl(void) +{ + return sve_vl_from_vq(u64_get_bits(rmi_feat_reg(0), + RMI_FEATURE_REGISTER_0_SVE_VL) + 1); +} + u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val) { u32 bps = u64_get_bits(rmi_feat_reg(0), RMI_FEATURE_REGISTER_0_NUM_BPS); -- 2.43.0