From patchwork Tue May 5 09:13:11 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?SsOpcsOpbXkgRmFuZ3XDqGRl?= X-Patchwork-Id: 6336131 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D8715BEEE1 for ; Tue, 5 May 2015 09:13:52 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0070F202FF for ; Tue, 5 May 2015 09:13:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DAE42202EB for ; Tue, 5 May 2015 09:13:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757207AbbEEJNs (ORCPT ); Tue, 5 May 2015 05:13:48 -0400 Received: from mail-wi0-f174.google.com ([209.85.212.174]:35672 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751175AbbEEJNo (ORCPT ); Tue, 5 May 2015 05:13:44 -0400 Received: by widdi4 with SMTP id di4so151927742wid.0 for ; Tue, 05 May 2015 02:13:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-type:content-transfer-encoding; bh=HhQXKY07ie/9805deGhZq6H5Ww/NEip+ZWVd1CjH0MY=; b=a/4Rkd4hgcfrXFr/E7sGkVd1PDZfzpMMgty0fD7ndYlnIezBbjxAWyTVGfRqBC8f7J E+Q47QLjmlZCq5tHrc6npGQluCRuXMUPKuLZXU9bBHi8KZwWMv4RNk+WsocqmCcLGpcf RkihgEid9EGaaDXGdm5buN89uHEZIomSNVnflA4td37TmKXCLxWmn3lb7WmgNkye7ykD cuftvjgPqgHgyEIiI+3LrtPYuSjTTdhasukTjN3HOMdkBiPOkoCLDW6XUTPK1Nj0C8M+ h/pjnK9U0WxMUWCDiWRnWJK8WF211xMFQB/nd5PX17QXlD3BFxXdnvZFiqkhbo5sFsKm d2cQ== X-Gm-Message-State: ALoCoQm22e9N5oNvWmDZhPjzs21PgG+vSpP2Rxqakd4u2zG1I8krk0rpcdS9lHCz/N3yyrbT8+rN X-Received: by 10.180.74.104 with SMTP id s8mr2194487wiv.40.1430817223554; Tue, 05 May 2015 02:13:43 -0700 (PDT) Received: from jeremy-UX32VD.home (LPuteaux-656-1-278-113.w80-15.abo.wanadoo.fr. [80.15.154.113]) by mx.google.com with ESMTPSA id 16sm24523086wjs.41.2015.05.05.02.13.42 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 05 May 2015 02:13:42 -0700 (PDT) From: =?UTF-8?q?J=C3=A9r=C3=A9my=20Fangu=C3=A8de?= To: kvmarm@lists.cs.columbia.edu Cc: Christoffer Dall , Paolo Bonzini , linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, tech@virtualopensystems.com, =?UTF-8?q?J=C3=A9r=C3=A9my=20Fangu=C3=A8de?= Subject: [RFC] ARM/ARM64: KVM: Implement KVM_FLUSH_DCACHE_GPA ioctl Date: Tue, 5 May 2015 11:13:11 +0200 Message-Id: <1430817191-6231-1-git-send-email-j.fanguede@virtualopensystems.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP To maintain cache coherency on ARM, we may need a mechanism to flush the data cache. This patch implements KVM_FLUSH_DCACHE_GPA vm ioctl which flushes the data cache at a specified address range. The input argument is a struct kvm_mem_addr containing the guest physical address and the length. Signed-off-by: Jérémy Fanguède --- arch/arm/kvm/arm.c | 13 +++++++++++++ include/uapi/linux/kvm.h | 6 ++++++ 2 files changed, 19 insertions(+) diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index d9631ec..8638fd2 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -886,6 +886,19 @@ long kvm_arch_vm_ioctl(struct file *filp, return 0; } + case KVM_FLUSH_DCACHE_GPA: { + struct kvm_mem_addr mem_addr; + hva_t hva; + gpa_t gpa; + + if (copy_from_user(&mem_addr, argp, sizeof(mem_addr))) + return -EFAULT; + + gpa = mem_addr.addr; + hva = gfn_to_hva(kvm, gpa_to_gfn(gpa)) | (gpa & ~PAGE_MASK); + kvm_flush_dcache_to_poc((void *)hva, mem_addr.len); + return 0; + } default: return -EINVAL; } diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 4b60056..3bc599e 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -978,6 +978,11 @@ struct kvm_arm_device_addr { __u64 addr; }; +struct kvm_mem_addr { + __u64 addr; + __u32 len; +}; + /* * Device control API, available with KVM_CAP_DEVICE_CTRL */ @@ -1199,6 +1204,7 @@ struct kvm_s390_ucas_mapping { /* Available with KVM_CAP_S390_IRQ_STATE */ #define KVM_S390_SET_IRQ_STATE _IOW(KVMIO, 0xb5, struct kvm_s390_irq_state) #define KVM_S390_GET_IRQ_STATE _IOW(KVMIO, 0xb6, struct kvm_s390_irq_state) +#define KVM_FLUSH_DCACHE_GPA _IOW(KVMIO, 0xb7, struct kvm_mem_addr) #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0) #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1)