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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 71BF4C67839 for ; Tue, 11 Dec 2018 23:34:47 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 43BAA20672 for ; Tue, 11 Dec 2018 23:34:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="aSAlFP+o"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="e7mh7ViV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 43BAA20672 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=5txOnsnopHlzvZhXrorfmtceKlBl0XAZnNBXHXKZvQ4=; b=aSAlFP+oMtar74J9Olf1NWslKp MBGCx2WYrOnEdP35y0i12IGkvuS2JDSrDV7+lrB0tycfMOnxSg8Su1vaTEIUCdaSjkDH56wMIMpQM 0VSJtkDtN97ERLlX0vRH7WShrArNcy0jNYgyuXieNYnFEc3seFLysfnMfZIU9wlJZg5D4v4El3TJX TtXwaTVYJCSiY3yqYRbp4oISroly0dvFWWtL21az7fztnUAwMSJhxUNQV8Kjtu6KgtxOZ9PaCTLkx c5ikKPni4RwCgxttYYTBvdEjm6Ok10hejwADOMDKCzMjW82xI/I2wu2FTojHDsQ72D79Rp0Tvt7LZ AXLX+qnA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gWrY4-0000Um-Bu; Tue, 11 Dec 2018 23:34:44 +0000 Received: from merlin.infradead.org ([2001:8b0:10b:1231::1]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gWrU7-0005cc-GS for linux-arm-kernel@bombadil.infradead.org; Tue, 11 Dec 2018 23:30:39 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=vU4h00dNJNb2tUTyzyUKfpAOWdGlBdqZ0W4nfWwFYtQ=; b=e7mh7ViVuyC5ycZ01wPsVYp3u fjx9wedcU2KGnoJCGaD/59k9vSOEETFve2GtKLVAwXZlQqMI2bu/lodKeinmgHS7fexq3rhbY1OqU Tz6ME4iz8/XnZmSUURzh2Wob76sFc6UI+TS7w6fAFsm+Rxf5XuiXSVr+RPrtmNsG7/WTf3ZjJNYjv l0KBmZ4RrjkxTzz+jAxSUI8zkgPb5lZqSdu+6H45viG+x/irvbKsUKwFWhHh5nMo36nI+F5AzSW9F IBbwQhAvDbyy9km1JF2buDJgJTwq44SdMfOw76OQ2PywCp8DXmf8BYdNa6IKNXQ61fzoljqGiUe5j BWcXirkww==; Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by merlin.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gWrU4-0003Lw-Eu for linux-arm-kernel@lists.infradead.org; Tue, 11 Dec 2018 23:30:37 +0000 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 EA5041993; Tue, 11 Dec 2018 15:30:22 -0800 (PST) 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 4C1303F614; Tue, 11 Dec 2018 15:30:21 -0800 (PST) From: Dave Martin To: kvmarm@lists.cs.columbia.edu Subject: [RFC PATCH v3 17/24] KVM: arm64: Enumerate SVE register indices for KVM_GET_REG_LIST Date: Tue, 11 Dec 2018 23:28:54 +0000 Message-Id: <1544570941-7377-18-git-send-email-Dave.Martin@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1544570941-7377-1-git-send-email-Dave.Martin@arm.com> References: <1544570941-7377-1-git-send-email-Dave.Martin@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181211_183036_666082_3DFFC73B X-CRM114-Status: GOOD ( 20.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Okamoto Takayuki , Christoffer Dall , Ard Biesheuvel , Marc Zyngier , Catalin Marinas , Will Deacon , =?UTF-8?q?Alex=20Benn=C3=A9e?= , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org This patch includes the SVE register IDs in the list returned by KVM_GET_REG_LIST, as appropriate. On a non-SVE-enabled vcpu, no extra IDs are added. On an SVE-enabled vcpu, the appropriate number of slice IDs are enumerated for each SVE register, depending on the maximum vector length for the vcpu. Signed-off-by: Dave Martin --- Changes since RFC v2: * Add KVM_SVE_{Z,P}REG_SIZE, KVM_SVE_SLICES(vcpu) macros to abstract out awkward expressions for the size of SVE registers and number of register slices. The underlying expressions are rather awkward and best not spelled out longhand. --- arch/arm64/kvm/guest.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 50 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 29f3f54..9657e9d 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -222,6 +222,11 @@ struct kreg_region { #define SVE_NUM_SLICES (1 << SVE_REG_SLICE_BITS) +#define KVM_SVE_ZREG_SIZE KVM_REG_SIZE(KVM_REG_ARM64_SVE_ZREG(0, 0)) +#define KVM_SVE_PREG_SIZE KVM_REG_SIZE(KVM_REG_ARM64_SVE_PREG(0, 0)) +#define KVM_SVE_SLICES(vcpu) \ + DIV_ROUND_UP((vcpu)->arch.sve_max_vl, KVM_SVE_ZREG_SIZE) + static int sve_reg_region(struct kreg_region *b, const struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) @@ -239,7 +244,7 @@ static int sve_reg_region(struct kreg_region *b, if (reg->id >= KVM_REG_ARM64_SVE_ZREG(0, 0) && reg->id <= KVM_REG_ARM64_SVE_ZREG(SVE_NUM_ZREGS - 1, SVE_NUM_SLICES - 1)) { - slice_size = KVM_REG_SIZE(KVM_REG_ARM64_SVE_ZREG(0, 0)); + slice_size = KVM_SVE_ZREG_SIZE; /* Compute start and end of the register: */ offset = SVE_SIG_ZREG_OFFSET(vq, reg_num) - SVE_SIG_REGS_OFFSET; @@ -251,7 +256,7 @@ static int sve_reg_region(struct kreg_region *b, reg->id <= KVM_REG_ARM64_SVE_FFR(SVE_NUM_SLICES - 1)) { /* (FFR is P16 for our purposes) */ - slice_size = KVM_REG_SIZE(KVM_REG_ARM64_SVE_PREG(0, 0)); + slice_size = KVM_SVE_PREG_SIZE; /* Compute start and end of the register: */ offset = SVE_SIG_PREG_OFFSET(vq, reg_num) - SVE_SIG_REGS_OFFSET; @@ -423,6 +428,44 @@ static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0; } +static unsigned long num_sve_regs(const struct kvm_vcpu *vcpu) +{ + unsigned int slices; + + if (!vcpu_has_sve(vcpu)) + return 0; + + slices = KVM_SVE_SLICES(vcpu); + return slices * (SVE_NUM_PREGS + SVE_NUM_ZREGS + 1 /* FFR */); +} + +static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu, u64 __user **uind) +{ + unsigned int slices, i, n; + + if (!vcpu_has_sve(vcpu)) + return 0; + + slices = KVM_SVE_SLICES(vcpu); + + for (i = 0; i < slices; i++) { + for (n = 0; n < SVE_NUM_ZREGS; n++) { + if (put_user(KVM_REG_ARM64_SVE_ZREG(n, i), (*uind)++)) + return -EFAULT; + } + + for (n = 0; n < SVE_NUM_PREGS; n++) { + if (put_user(KVM_REG_ARM64_SVE_PREG(n, i), (*uind)++)) + return -EFAULT; + } + + if (put_user(KVM_REG_ARM64_SVE_FFR(i), (*uind)++)) + return -EFAULT; + } + + return 0; +} + /** * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG * @@ -433,6 +476,7 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) unsigned long res = 0; res += num_core_regs(vcpu); + res += num_sve_regs(vcpu); res += kvm_arm_num_sys_reg_descs(vcpu); res += kvm_arm_get_fw_num_regs(vcpu); res += NUM_TIMER_REGS; @@ -453,6 +497,10 @@ int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) if (ret < 0) return ret; + ret = copy_sve_reg_indices(vcpu, &uindices); + if (ret) + return ret; + ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices); if (ret) return ret; -- 2.1.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel