From patchwork Fri Dec 20 16:46:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 852619 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F29C5221462; Fri, 20 Dec 2024 16:51:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734713496; cv=none; b=EFixN4Lm8NRd0jjcJaUR0drfhzE9s1B6WnJatyqT3uaIBLKNCKykgNOZrxxafSwvf1r8SjqrYjnjIyhyczSnR8OVfzMFVNWzC3MJwuWxIDGwnEALXamlFJEaoOAJw8XnFFuMyu2cnL+U/CrsR1Z/HEMJsl7PhoFmECK2LPeXmHI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734713496; c=relaxed/simple; bh=3aaZhNirOZ+7l9BeX+c3sgo5KaaCuR6ys35EPFSwf5I=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=dsfZJZMpnRHdYTOt7r+KL9mnQbseDw2esYMXbXOHuYLsMo/xFmyjpFwi13IJJDePhcARLu/vjXTXWhdTgsG8LmbDmPzTo3omWrqjIBMJyoAe0Q+wTJbcleRTd9GXh9KSe/8xCKFva2Wjht5uJ2M18Rvm/bxCwWrbbpaqhmgDTNo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ivQ4iWm1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ivQ4iWm1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3109EC4CEDC; Fri, 20 Dec 2024 16:51:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734713495; bh=3aaZhNirOZ+7l9BeX+c3sgo5KaaCuR6ys35EPFSwf5I=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ivQ4iWm1QqcGDvdvFW2D7CizC4bu4+NLYAkUu1z6hEuoDkKIRPNgFdoOjGrPLZPx0 8iunglxHnzAf/Kw+EyWDi999khVY2SmWxFb8jn6V/WCUXOzthp0RDO0TjfSwCpBPx1 L/2qboNeQKxSTgBDgs9xsKF1MgOLis83ORHb6s1Osr0wy0iI+gkFhZnXnAZc6IGlMA 9CLcet2iXGVta8LAt5sse2AR6W67K1pGEafmWc71jWluWW6OPtkr4S3gseNAQI9cHz XN4+4r8upRTpK463qnJEv/IUwvzk/VqN6OvUDrNayOJuUcyn+AFmXPH8xOIB/OsExE o9Js31he67Nqg== From: Mark Brown Date: Fri, 20 Dec 2024 16:46:35 +0000 Subject: [PATCH RFC v3 10/27] KVM: arm64: Rename SVE finalization constants to be more general Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241220-kvm-arm64-sme-v3-10-05b018c1ffeb@kernel.org> References: <20241220-kvm-arm64-sme-v3-0-05b018c1ffeb@kernel.org> In-Reply-To: <20241220-kvm-arm64-sme-v3-0-05b018c1ffeb@kernel.org> To: Marc Zyngier , Oliver Upton , Joey Gouly , Catalin Marinas , Suzuki K Poulose , Will Deacon , Paolo Bonzini , Jonathan Corbet , Shuah Khan Cc: Dave Martin , Fuad Tabba , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-1b0d6 X-Developer-Signature: v=1; a=openpgp-sha256; l=7533; i=broonie@kernel.org; h=from:subject:message-id; bh=3aaZhNirOZ+7l9BeX+c3sgo5KaaCuR6ys35EPFSwf5I=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBnZaBcHuq5Lk45QXE8KUQ/QhEs1N1N14WzcOZ4wGiW krf/jliJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZ2WgXAAKCRAk1otyXVSH0IF6B/ 4t9q0gL7iHDyrcIJDUPG9jcN0euzIJJrpuoBsjuqccr3yuWuHS+PskLa+15vbpMf/dMpx6VTNMpISo Hw6QNQq5HECzh66lBgfetGl9X28k6KB+mid8G6x/X5XrkYPLBL8fKzWu5kowdwGINS1WOiwmkybCIe ShCjwWUEz9BNx3ertYmduRBlhprlCpEsQ4HkTbtlJzXd+mnkjgSh3qpwND2fqFoOWOaLs8UO+62vIA /gHCB3DrMJtiqB1jvIvtFW1dmg4hlPEe0UHsNRglkTmz8yrW3HNQLVfv+aLRFFmtuNvldsTEX09MVN GVJBvuszAqq3rHyaa7GqsuPLCjBtkE X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Due to the overlap between SVE and SME vector length configuration created by streaming mode SVE we will finalize both at once. Rename the existing finalization to use _VEC (vector) for the naming to avoid confusion. Since this includes the userspace API we create an alias KVM_ARM_VCPU_VEC for the existing KVM_ARM_VCPU_SVE capability, existing code which does not enable SME will be unaffected and any SME only code will not need to use SVE constants. No functional change. Signed-off-by: Mark Brown --- arch/arm64/include/asm/kvm_host.h | 6 ++++-- arch/arm64/include/uapi/asm/kvm.h | 6 ++++++ arch/arm64/kvm/guest.c | 10 +++++----- arch/arm64/kvm/hyp/nvhe/pkvm.c | 2 +- arch/arm64/kvm/reset.c | 20 ++++++++++---------- 5 files changed, 26 insertions(+), 18 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 97b617606221e8c11fd2b55d9636848d8453209f..f64ad573573cf000c4644f12f9e072a2fdfc3824 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -873,7 +873,7 @@ struct kvm_vcpu_arch { /* KVM_ARM_VCPU_INIT completed */ #define VCPU_INITIALIZED __vcpu_single_flag(cflags, BIT(0)) /* SVE config completed */ -#define VCPU_SVE_FINALIZED __vcpu_single_flag(cflags, BIT(1)) +#define VCPU_VEC_FINALIZED __vcpu_single_flag(cflags, BIT(1)) /* Exception pending */ #define PENDING_EXCEPTION __vcpu_single_flag(iflags, BIT(0)) @@ -948,6 +948,8 @@ struct kvm_vcpu_arch { #define vcpu_has_sve(vcpu) kvm_has_sve((vcpu)->kvm) #endif +#define vcpu_has_vec(vcpu) vcpu_has_sve(vcpu) + #ifdef CONFIG_ARM64_PTR_AUTH #define vcpu_has_ptrauth(vcpu) \ ((cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH) || \ @@ -1414,7 +1416,7 @@ struct kvm *kvm_arch_alloc_vm(void); int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature); bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu); -#define kvm_arm_vcpu_sve_finalized(vcpu) vcpu_get_flag(vcpu, VCPU_SVE_FINALIZED) +#define kvm_arm_vcpu_vec_finalized(vcpu) vcpu_get_flag(vcpu, VCPU_VEC_FINALIZED) #define kvm_has_mte(kvm) \ (system_supports_mte() && \ diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 66736ff04011e0fa9fcfb74154d5613bf4ee89f7..9d80d22af9d4e00204f5096fb7c8c2ee8c3646c1 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -109,6 +109,12 @@ struct kvm_regs { #define KVM_ARM_VCPU_PTRAUTH_GENERIC 6 /* VCPU uses generic authentication */ #define KVM_ARM_VCPU_HAS_EL2 7 /* Support nested virtualization */ +/* + * An alias for _SVE since we finalize VL configuration for both SVE and SME + * simultaneously. + */ +#define KVM_ARM_VCPU_VEC KVM_ARM_VCPU_SVE + struct kvm_vcpu_init { __u32 target; __u32 features[7]; diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 12dad841f2a51276eee4d4da7400c1b2a5732ff8..62ff51d6e4584acc71205f5d4b1d2f3d2e2d2f88 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -342,7 +342,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) if (!vcpu_has_sve(vcpu)) return -ENOENT; - if (kvm_arm_vcpu_sve_finalized(vcpu)) + if (kvm_arm_vcpu_vec_finalized(vcpu)) return -EPERM; /* too late! */ if (WARN_ON(vcpu->arch.sve_state)) @@ -497,7 +497,7 @@ static int get_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) if (ret) return ret; - if (!kvm_arm_vcpu_sve_finalized(vcpu)) + if (!kvm_arm_vcpu_vec_finalized(vcpu)) return -EPERM; if (copy_to_user(uptr, vcpu->arch.sve_state + region.koffset, @@ -523,7 +523,7 @@ static int set_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) if (ret) return ret; - if (!kvm_arm_vcpu_sve_finalized(vcpu)) + if (!kvm_arm_vcpu_vec_finalized(vcpu)) return -EPERM; if (copy_from_user(vcpu->arch.sve_state + region.koffset, uptr, @@ -657,7 +657,7 @@ static unsigned long num_sve_regs(const struct kvm_vcpu *vcpu) return 0; /* Policed by KVM_GET_REG_LIST: */ - WARN_ON(!kvm_arm_vcpu_sve_finalized(vcpu)); + WARN_ON(!kvm_arm_vcpu_vec_finalized(vcpu)); return slices * (SVE_NUM_PREGS + SVE_NUM_ZREGS + 1 /* FFR */) + 1; /* KVM_REG_ARM64_SVE_VLS */ @@ -675,7 +675,7 @@ static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, return 0; /* Policed by KVM_GET_REG_LIST: */ - WARN_ON(!kvm_arm_vcpu_sve_finalized(vcpu)); + WARN_ON(!kvm_arm_vcpu_vec_finalized(vcpu)); /* * Enumerate this first, so that userspace can save/restore in diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c index 446a9114b0d3ee4323a9cd8d618d36035e85e4d0..0a4e1f5105592b23a0505bf7680c66e76b5c2a65 100644 --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -314,7 +314,7 @@ static void pkvm_vcpu_init_sve(struct pkvm_hyp_vcpu *hyp_vcpu, struct kvm_vcpu * struct kvm_vcpu *vcpu = &hyp_vcpu->vcpu; if (!vcpu_has_feature(vcpu, KVM_ARM_VCPU_SVE)) - vcpu_clear_flag(vcpu, VCPU_SVE_FINALIZED); + vcpu_clear_flag(vcpu, VCPU_VEC_FINALIZED); } static int init_pkvm_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu, diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 803e11b0dc8f5eb74b07b0ad745b0c4f666713d5..ce726b1d4e8e90cfd4459a6cb9c67b8805424e22 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -92,7 +92,7 @@ static void kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu) * Finalize vcpu's maximum SVE vector length, allocating * vcpu->arch.sve_state as necessary. */ -static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu) +static int kvm_vcpu_finalize_vec(struct kvm_vcpu *vcpu) { void *buf; unsigned int vl; @@ -122,21 +122,21 @@ static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu) } vcpu->arch.sve_state = buf; - vcpu_set_flag(vcpu, VCPU_SVE_FINALIZED); + vcpu_set_flag(vcpu, VCPU_VEC_FINALIZED); return 0; } int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature) { switch (feature) { - case KVM_ARM_VCPU_SVE: - if (!vcpu_has_sve(vcpu)) + case KVM_ARM_VCPU_VEC: + if (!vcpu_has_vec(vcpu)) return -EINVAL; - if (kvm_arm_vcpu_sve_finalized(vcpu)) + if (kvm_arm_vcpu_vec_finalized(vcpu)) return -EPERM; - return kvm_vcpu_finalize_sve(vcpu); + return kvm_vcpu_finalize_vec(vcpu); } return -EINVAL; @@ -144,7 +144,7 @@ int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature) bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu) { - if (vcpu_has_sve(vcpu) && !kvm_arm_vcpu_sve_finalized(vcpu)) + if (vcpu_has_vec(vcpu) && !kvm_arm_vcpu_vec_finalized(vcpu)) return false; return true; @@ -161,7 +161,7 @@ void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu) kfree(vcpu->arch.ccsidr); } -static void kvm_vcpu_reset_sve(struct kvm_vcpu *vcpu) +static void kvm_vcpu_reset_vec(struct kvm_vcpu *vcpu) { if (vcpu_has_sve(vcpu)) memset(vcpu->arch.sve_state, 0, vcpu_sve_state_size(vcpu)); @@ -204,11 +204,11 @@ void kvm_reset_vcpu(struct kvm_vcpu *vcpu) if (loaded) kvm_arch_vcpu_put(vcpu); - if (!kvm_arm_vcpu_sve_finalized(vcpu)) { + if (!kvm_arm_vcpu_vec_finalized(vcpu)) { if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_SVE)) kvm_vcpu_enable_sve(vcpu); } else { - kvm_vcpu_reset_sve(vcpu); + kvm_vcpu_reset_vec(vcpu); } if (vcpu_el1_is_32bit(vcpu))