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=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 DC2E2C43381 for ; Tue, 19 Mar 2019 17:57:26 +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 A05A620651 for ; Tue, 19 Mar 2019 17:57:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="bPjCRtoN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A05A620651 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=DnmClWT4GX9dCgz6QCWO+NRlsrhNW+MYsiISBD3ksmM=; b=bPjCRtoNkGuiCs8+Xn4OvVIhYW RtbexXuJu8QNqi4Ew0T44RJqyHY8Ex7QoLi3KuR5/O76IFNi7v1wj0ZqD36QeYv1TswZcz3r042RQ rWKMmBiNH2ICIWKLCbNpPwx1Le+9OMYm2doMtMh6XJYVCQ/dw1N+i4c6zSERc7LjARIcXjJ1fXWus nOMweZF8x0w5r8NjLXyW88cAomEtoXig2xh9QHGOLmlIGlgEAdz/cr7kwPmwEl64b+p6V+n7Xeout 4loatS2v+o9TOmNY8DQLTt0MKFhWIMk8T8XqOQ/U7fJgm4shHYfyp6TZCzwciRF3+CvEcfd6LmhWI YJ++f+gw==; 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 1h6IzI-0005T2-Qj; Tue, 19 Mar 2019 17:57:20 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h6Ivl-0001HM-20 for linux-arm-kernel@lists.infradead.org; Tue, 19 Mar 2019 17:53:45 +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 DAAA7174E; Tue, 19 Mar 2019 10:53:40 -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 EA2E03F614; Tue, 19 Mar 2019 10:53:38 -0700 (PDT) From: Dave Martin To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v6 16/27] KVM: arm64: Factor out core register ID enumeration Date: Tue, 19 Mar 2019 17:52:07 +0000 Message-Id: <1553017938-710-17-git-send-email-Dave.Martin@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1553017938-710-1-git-send-email-Dave.Martin@arm.com> References: <1553017938-710-1-git-send-email-Dave.Martin@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190319_105341_300902_65C05DBA X-CRM114-Status: GOOD ( 17.29 ) 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 , Zhang Lei , Julien Grall , =?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 In preparation for adding logic to filter out some KVM_REG_ARM_CORE registers from the KVM_GET_REG_LIST output, this patch factors out the core register enumeration into a separate function and rebuilds num_core_regs() on top of it. This may be a little more expensive (depending on how good a job the compiler does of specialising the code), but KVM_GET_REG_LIST is not a hot path. This will make it easier to consolidate ID filtering code in one place. No functional change. Signed-off-by: Dave Martin --- Changes since v5: * New patch. This reimplements part of the separately-posted patch "KVM: arm64: Factor out KVM_GET_REG_LIST core register enumeration", minus aspects that potentially break the ABI. As a result, the opportunity to truly consolidate all the ID reg filtering in one place is deliberately left on the floor, for now. This will be addressed in a separate series later on. --- arch/arm64/kvm/guest.c | 33 +++++++++++++++++++++++++-------- 1 file changed, 25 insertions(+), 8 deletions(-) diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 3e38eb2..a391a61 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -194,9 +195,28 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) return -EINVAL; } +static int kvm_arm_copy_core_reg_indices(u64 __user *uindices) +{ + unsigned int i; + int n = 0; + const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE; + + for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) { + if (uindices) { + if (put_user(core_reg | i, uindices)) + return -EFAULT; + uindices++; + } + + n++; + } + + return n; +} + static unsigned long num_core_regs(void) { - return sizeof(struct kvm_regs) / sizeof(__u32); + return kvm_arm_copy_core_reg_indices(NULL); } /** @@ -276,15 +296,12 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu) */ int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices) { - unsigned int i; - const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE; int ret; - for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) { - if (put_user(core_reg | i, uindices)) - return -EFAULT; - uindices++; - } + ret = kvm_arm_copy_core_reg_indices(uindices); + if (ret) + return ret; + uindices += ret; ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices); if (ret) -- 2.1.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel