From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Martin Subject: [PATCH 06/14] KVM: arm64/sve: Miscellaneous tidyups in guest.c Date: Fri, 12 Apr 2019 17:28:10 +0100 Message-ID: <1555086498-26691-7-git-send-email-Dave.Martin@arm.com> References: <1555086498-26691-1-git-send-email-Dave.Martin@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 4562F4A4DD for ; Fri, 12 Apr 2019 12:29:22 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id G0ppOnGgPBRJ for ; Fri, 12 Apr 2019 12:29:20 -0400 (EDT) Received: from foss.arm.com (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D5A7B4A4D3 for ; Fri, 12 Apr 2019 12:29:19 -0400 (EDT) In-Reply-To: <1555086498-26691-1-git-send-email-Dave.Martin@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: kvmarm@lists.cs.columbia.edu Cc: Okamoto Takayuki , Christoffer Dall , Ard Biesheuvel , Marc Zyngier , Catalin Marinas , Will Deacon , Zhang Lei , Julien Grall , linux-arm-kernel@lists.infradead.org List-Id: kvmarm@lists.cs.columbia.edu * Remove a few redundant blank lines that are stylistically inconsistent with code already in guest.c and are just taking up space. * Delete a couple of pointless empty default cases from switch statements whose behaviour is otherwise obvious anyway. * Fix some typos and consolidate some redundantly duplicated comments. * Respell the slice index check in sve_reg_to_region() as "> 0" to be more consistent with what is logically being checked here (i.e., "is the slice index too large"), even though we don't try to cope with multiple slices yet. No functional change. Suggested-by: Andrew Jones Signed-off-by: Dave Martin --- arch/arm64/kvm/guest.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 2e449e1..f5ff7ae 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -290,9 +290,10 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) #define KVM_SVE_PREG_SIZE KVM_REG_SIZE(KVM_REG_ARM64_SVE_PREG(0, 0)) /* - * number of register slices required to cover each whole SVE register on vcpu - * NOTE: If you are tempted to modify this, you must also to rework - * sve_reg_to_region() to match: + * Number of register slices required to cover each whole SVE register. + * NOTE: Only the first slice every exists, for now. + * If you are tempted to modify this, you must also rework sve_reg_to_region() + * to match: */ #define vcpu_sve_slices(vcpu) 1 @@ -334,8 +335,7 @@ static int sve_reg_to_region(struct sve_state_reg_region *region, /* Verify that we match the UAPI header: */ BUILD_BUG_ON(SVE_NUM_SLICES != KVM_ARM64_SVE_MAX_SLICES); - /* Only the first slice ever exists, for now: */ - if ((reg->id & SVE_REG_SLICE_MASK) != 0) + if ((reg->id & SVE_REG_SLICE_MASK) > 0) return -ENOENT; vq = sve_vq_from_vl(vcpu->arch.sve_max_vl); @@ -520,7 +520,6 @@ static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) static unsigned long num_sve_regs(const struct kvm_vcpu *vcpu) { - /* Only the first slice ever exists, for now */ const unsigned int slices = vcpu_sve_slices(vcpu); if (!vcpu_has_sve(vcpu)) @@ -536,7 +535,6 @@ static unsigned long num_sve_regs(const struct kvm_vcpu *vcpu) static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, u64 __user *uindices) { - /* Only the first slice ever exists, for now */ const unsigned int slices = vcpu_sve_slices(vcpu); u64 reg; unsigned int i, n; @@ -555,7 +553,6 @@ static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, reg = KVM_REG_ARM64_SVE_VLS; if (put_user(reg, uindices++)) return -EFAULT; - ++num_regs; for (i = 0; i < slices; i++) { @@ -563,7 +560,6 @@ static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, reg = KVM_REG_ARM64_SVE_ZREG(n, i); if (put_user(reg, uindices++)) return -EFAULT; - num_regs++; } @@ -571,14 +567,12 @@ static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, reg = KVM_REG_ARM64_SVE_PREG(n, i); if (put_user(reg, uindices++)) return -EFAULT; - num_regs++; } reg = KVM_REG_ARM64_SVE_FFR(i); if (put_user(reg, uindices++)) return -EFAULT; - num_regs++; } @@ -645,7 +639,6 @@ int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) case KVM_REG_ARM_CORE: return get_core_reg(vcpu, reg); case KVM_REG_ARM_FW: return kvm_arm_get_fw_reg(vcpu, reg); case KVM_REG_ARM64_SVE: return get_sve_reg(vcpu, reg); - default: break; /* fall through */ } if (is_timer_reg(reg->id)) @@ -664,7 +657,6 @@ int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) case KVM_REG_ARM_CORE: return set_core_reg(vcpu, reg); case KVM_REG_ARM_FW: return kvm_arm_set_fw_reg(vcpu, reg); case KVM_REG_ARM64_SVE: return set_sve_reg(vcpu, reg); - default: break; /* fall through */ } if (is_timer_reg(reg->id)) -- 2.1.4 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 781D6C10F14 for ; 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Fri, 12 Apr 2019 12:29:22 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id G0ppOnGgPBRJ for ; Fri, 12 Apr 2019 12:29:20 -0400 (EDT) Received: from foss.arm.com (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D5A7B4A4D3 for ; Fri, 12 Apr 2019 12:29:19 -0400 (EDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 486F215AD; Fri, 12 Apr 2019 09:29:19 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 2FBEA3F718; Fri, 12 Apr 2019 09:29:17 -0700 (PDT) From: Dave Martin To: kvmarm@lists.cs.columbia.edu Subject: [PATCH 06/14] KVM: arm64/sve: Miscellaneous tidyups in guest.c Date: Fri, 12 Apr 2019 17:28:10 +0100 Message-Id: <1555086498-26691-7-git-send-email-Dave.Martin@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1555086498-26691-1-git-send-email-Dave.Martin@arm.com> References: <1555086498-26691-1-git-send-email-Dave.Martin@arm.com> Cc: Okamoto Takayuki , Christoffer Dall , Ard Biesheuvel , Marc Zyngier , Catalin Marinas , Will Deacon , Zhang Lei , Julien Grall , linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Message-ID: <20190412162810.JUknTS7PjqyPVChru4uXQTCcflX0RISwpe0VoDXrZCI@z> * Remove a few redundant blank lines that are stylistically inconsistent with code already in guest.c and are just taking up space. * Delete a couple of pointless empty default cases from switch statements whose behaviour is otherwise obvious anyway. * Fix some typos and consolidate some redundantly duplicated comments. * Respell the slice index check in sve_reg_to_region() as "> 0" to be more consistent with what is logically being checked here (i.e., "is the slice index too large"), even though we don't try to cope with multiple slices yet. No functional change. Suggested-by: Andrew Jones Signed-off-by: Dave Martin --- arch/arm64/kvm/guest.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 2e449e1..f5ff7ae 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -290,9 +290,10 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) #define KVM_SVE_PREG_SIZE KVM_REG_SIZE(KVM_REG_ARM64_SVE_PREG(0, 0)) /* - * number of register slices required to cover each whole SVE register on vcpu - * NOTE: If you are tempted to modify this, you must also to rework - * sve_reg_to_region() to match: + * Number of register slices required to cover each whole SVE register. + * NOTE: Only the first slice every exists, for now. + * If you are tempted to modify this, you must also rework sve_reg_to_region() + * to match: */ #define vcpu_sve_slices(vcpu) 1 @@ -334,8 +335,7 @@ static int sve_reg_to_region(struct sve_state_reg_region *region, /* Verify that we match the UAPI header: */ BUILD_BUG_ON(SVE_NUM_SLICES != KVM_ARM64_SVE_MAX_SLICES); - /* Only the first slice ever exists, for now: */ - if ((reg->id & SVE_REG_SLICE_MASK) != 0) + if ((reg->id & SVE_REG_SLICE_MASK) > 0) return -ENOENT; vq = sve_vq_from_vl(vcpu->arch.sve_max_vl); @@ -520,7 +520,6 @@ static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) static unsigned long num_sve_regs(const struct kvm_vcpu *vcpu) { - /* Only the first slice ever exists, for now */ const unsigned int slices = vcpu_sve_slices(vcpu); if (!vcpu_has_sve(vcpu)) @@ -536,7 +535,6 @@ static unsigned long num_sve_regs(const struct kvm_vcpu *vcpu) static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, u64 __user *uindices) { - /* Only the first slice ever exists, for now */ const unsigned int slices = vcpu_sve_slices(vcpu); u64 reg; unsigned int i, n; @@ -555,7 +553,6 @@ static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, reg = KVM_REG_ARM64_SVE_VLS; if (put_user(reg, uindices++)) return -EFAULT; - ++num_regs; for (i = 0; i < slices; i++) { @@ -563,7 +560,6 @@ static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, reg = KVM_REG_ARM64_SVE_ZREG(n, i); if (put_user(reg, uindices++)) return -EFAULT; - num_regs++; } @@ -571,14 +567,12 @@ static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, reg = KVM_REG_ARM64_SVE_PREG(n, i); if (put_user(reg, uindices++)) return -EFAULT; - num_regs++; } reg = KVM_REG_ARM64_SVE_FFR(i); if (put_user(reg, uindices++)) return -EFAULT; - num_regs++; } @@ -645,7 +639,6 @@ int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) case KVM_REG_ARM_CORE: return get_core_reg(vcpu, reg); case KVM_REG_ARM_FW: return kvm_arm_get_fw_reg(vcpu, reg); case KVM_REG_ARM64_SVE: return get_sve_reg(vcpu, reg); - default: break; /* fall through */ } if (is_timer_reg(reg->id)) @@ -664,7 +657,6 @@ int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) case KVM_REG_ARM_CORE: return set_core_reg(vcpu, reg); case KVM_REG_ARM_FW: return kvm_arm_set_fw_reg(vcpu, reg); case KVM_REG_ARM64_SVE: return set_sve_reg(vcpu, reg); - default: break; /* fall through */ } if (is_timer_reg(reg->id)) -- 2.1.4 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm