From patchwork Sat May 6 15:24:35 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9714985 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D01C260387 for ; Sat, 6 May 2017 15:41:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A099627FAC for ; Sat, 6 May 2017 15:41:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 952E528630; Sat, 6 May 2017 15:41:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3486D27FAC for ; Sat, 6 May 2017 15:41:47 +0000 (UTC) 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=TQ2BuzwaNFA0rq80rnYWPiVDsmowXNJOqcwoeiC6ZC8=; b=li8jlMeigsx5OimEF5o8sZwJBg MJod3Yfuh4XrvdISq9FqrdxxinD4IBTQJO4FLLeBe9KgxaKhk1qzGjW3Gc0LD6WTiTa9lm+00yBVV kvIPzyF1cXRkKN1tvqqYU+8JYYCIprrsFFCPil5licQy9zQGznUOWRVlgt6maplPNE/OO989MRnNf 5E9cOM4kQeH5FSLa9IAz2NxhPJkbnP6SsEwbL185ulU1nI8UXtusETvmCJU81xh6S9SMO6imjp3DO jA4s3DOudJdVlfLzEBFjQBlGFVAYGgsAAReMzTlT35UQx1M/MF+rSlrF1Q51yY+luPO1cWFAEEE05 XB45HJwg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1d71q4-0007hE-Db; Sat, 06 May 2017 15:41:44 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1d71l4-0003l1-Fx for linux-arm-kernel@lists.infradead.org; Sat, 06 May 2017 15:36:36 +0000 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id ACCCC37EEE; Sat, 6 May 2017 15:26:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com ACCCC37EEE Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx05.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=eric.auger@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com ACCCC37EEE Received: from localhost.localdomain.com (ovpn-116-214.ams2.redhat.com [10.36.116.214]) by smtp.corp.redhat.com (Postfix) with ESMTP id BBA85179D9; Sat, 6 May 2017 15:26:07 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, marc.zyngier@arm.com, christoffer.dall@linaro.org, andre.przywara@arm.com, vijayak@caviumnetworks.com, Vijaya.Kumar@cavium.com, peter.maydell@linaro.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Subject: [PATCH v7 16/24] KVM: arm64: vgic-its: KVM_DEV_ARM_ITS_SAVE/RESTORE_TABLES Date: Sat, 6 May 2017 17:24:35 +0200 Message-Id: <1494084283-12723-17-git-send-email-eric.auger@redhat.com> In-Reply-To: <1494084283-12723-1-git-send-email-eric.auger@redhat.com> References: <1494084283-12723-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Sat, 06 May 2017 15:26:12 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170506_083634_594238_041743D9 X-CRM114-Status: GOOD ( 17.95 ) 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: Prasun.Kapoor@cavium.com, drjones@redhat.com, quintela@redhat.com, dgilbert@redhat.com, pbonzini@redhat.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce new attributes in KVM_DEV_ARM_VGIC_GRP_CTRL group: - KVM_DEV_ARM_ITS_SAVE_TABLES: saves the ITS tables into guest RAM - KVM_DEV_ARM_ITS_RESTORE_TABLES: restores them into VGIC internal structures. We hold the vcpus lock during the save and restore to make sure no vcpu is running. At this stage the functionality is not yet implemented. Only the skeleton is put in place. Signed-off-by: Eric Auger Acked-by: Marc Zyngier Reviewed-by: Christoffer Dall --- v6 -> v7: - also hold the its_lock on save and restore v5 -> v6: - remove the pending table sync from the ITS table restore v4 -> v5: - use KVM_DEV_ARM_ITS_SAVE_TABLES and KVM_DEV_ARM_ITS_RESTORE_TABLES - rename *flush* into *save* - call its_sync_lpi_pending_table at the end of restore - use abi framework v3 -> v4: - pass kvm struct handle to vgic_its_flush/restore_pending_tables - take the kvm lock and vcpu locks - ABI revision check - check attr->attr is null v1 -> v2: - remove useless kvm parameter --- arch/arm/include/uapi/asm/kvm.h | 4 +- arch/arm64/include/uapi/asm/kvm.h | 4 +- virt/kvm/arm/vgic/vgic-its.c | 107 ++++++++++++++++++++++++++++++++++++-- 3 files changed, 109 insertions(+), 6 deletions(-) diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h index 4beb83b..8e6563c 100644 --- a/arch/arm/include/uapi/asm/kvm.h +++ b/arch/arm/include/uapi/asm/kvm.h @@ -199,7 +199,9 @@ struct kvm_arch_memory_slot { #define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff #define VGIC_LEVEL_INFO_LINE_LEVEL 0 -#define KVM_DEV_ARM_VGIC_CTRL_INIT 0 +#define KVM_DEV_ARM_VGIC_CTRL_INIT 0 +#define KVM_DEV_ARM_ITS_SAVE_TABLES 1 +#define KVM_DEV_ARM_ITS_RESTORE_TABLES 2 /* KVM_IRQ_LINE irq field index values */ #define KVM_ARM_IRQ_TYPE_SHIFT 24 diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 7e8dd69..1e35115 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -219,7 +219,9 @@ struct kvm_arch_memory_slot { #define KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK 0x3ff #define VGIC_LEVEL_INFO_LINE_LEVEL 0 -#define KVM_DEV_ARM_VGIC_CTRL_INIT 0 +#define KVM_DEV_ARM_VGIC_CTRL_INIT 0 +#define KVM_DEV_ARM_ITS_SAVE_TABLES 1 +#define KVM_DEV_ARM_ITS_RESTORE_TABLES 2 /* Device Control API on vcpu fd */ #define KVM_ARM_VCPU_PMU_V3_CTRL 0 diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index ffd0a80..cb7ae4c 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -1703,12 +1703,71 @@ int vgic_its_attr_regs_access(struct kvm_device *dev, } /** + * vgic_its_save_device_tables - Save the device table and all ITT + * into guest RAM + */ +static int vgic_its_save_device_tables(struct vgic_its *its) +{ + return -ENXIO; +} + +/** + * vgic_its_restore_device_tables - Restore the device table and all ITT + * from guest RAM to internal data structs + */ +static int vgic_its_restore_device_tables(struct vgic_its *its) +{ + return -ENXIO; +} + +/** + * vgic_its_save_collection_table - Save the collection table into + * guest RAM + */ +static int vgic_its_save_collection_table(struct vgic_its *its) +{ + return -ENXIO; +} + +/** + * vgic_its_restore_collection_table - reads the collection table + * in guest memory and restores the ITS internal state. Requires the + * BASER registers to be restored before. + */ +static int vgic_its_restore_collection_table(struct vgic_its *its) +{ + return -ENXIO; +} + +/** * vgic_its_save_tables_v0 - Save the ITS tables into guest ARM * according to v0 ABI */ static int vgic_its_save_tables_v0(struct vgic_its *its) { - return -ENXIO; + struct kvm *kvm = its->dev->kvm; + int ret; + + mutex_lock(&kvm->lock); + mutex_lock(&its->its_lock); + + if (!lock_all_vcpus(kvm)) { + mutex_unlock(&its->its_lock); + mutex_unlock(&kvm->lock); + return -EBUSY; + } + + ret = vgic_its_save_device_tables(its); + if (ret) + goto out; + + ret = vgic_its_save_collection_table(its); + +out: + unlock_all_vcpus(kvm); + mutex_unlock(&its->its_lock); + mutex_unlock(&kvm->lock); + return ret; } /** @@ -1718,7 +1777,37 @@ static int vgic_its_save_tables_v0(struct vgic_its *its) */ static int vgic_its_restore_tables_v0(struct vgic_its *its) { - return -ENXIO; + struct kvm *kvm = its->dev->kvm; + int ret; + + mutex_lock(&kvm->lock); + mutex_lock(&its->its_lock); + + if (!lock_all_vcpus(kvm)) { + mutex_unlock(&its->its_lock); + mutex_unlock(&kvm->lock); + return -EBUSY; + } + + ret = vgic_its_restore_collection_table(its); + if (ret) + goto out; + + ret = vgic_its_restore_device_tables(its); + +out: + unlock_all_vcpus(kvm); + mutex_unlock(&its->its_lock); + mutex_unlock(&kvm->lock); + + if (ret) + return ret; + + /* + * On restore path, MSI injections can happen before the + * first VCPU run so let's complete the GIC init here. + */ + return kvm_vgic_map_resources(its->dev->kvm); } static int vgic_its_commit_v0(struct vgic_its *its) @@ -1751,6 +1840,10 @@ static int vgic_its_has_attr(struct kvm_device *dev, switch (attr->attr) { case KVM_DEV_ARM_VGIC_CTRL_INIT: return 0; + case KVM_DEV_ARM_ITS_SAVE_TABLES: + return 0; + case KVM_DEV_ARM_ITS_RESTORE_TABLES: + return 0; } break; case KVM_DEV_ARM_VGIC_GRP_ITS_REGS: @@ -1786,14 +1879,20 @@ static int vgic_its_set_attr(struct kvm_device *dev, return 0; } - case KVM_DEV_ARM_VGIC_GRP_CTRL: + case KVM_DEV_ARM_VGIC_GRP_CTRL: { + const struct vgic_its_abi *abi = vgic_its_get_abi(its); + switch (attr->attr) { case KVM_DEV_ARM_VGIC_CTRL_INIT: its->initialized = true; return 0; + case KVM_DEV_ARM_ITS_SAVE_TABLES: + return abi->save_tables(its); + case KVM_DEV_ARM_ITS_RESTORE_TABLES: + return abi->restore_tables(its); } - break; + } case KVM_DEV_ARM_VGIC_GRP_ITS_REGS: { u64 __user *uaddr = (u64 __user *)(long)attr->addr; u64 reg;