From patchwork Mon Mar 27 09:31:11 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9645877 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 C89AE602D6 for ; Mon, 27 Mar 2017 09:40:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B879928338 for ; Mon, 27 Mar 2017 09:40:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id ACFFA2833B; Mon, 27 Mar 2017 09:40:48 +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 431E128338 for ; Mon, 27 Mar 2017 09:40:48 +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=vE4fc978QOzrD8Vu6OsfdZ7TMlm2iSOf/8Jee1g0W+I=; b=SXRoB9weQ+z8ZJ1f3EcYdfWQn1 uBlm5wEbQvUcI1JhoQ4TJnd/kl7VzUfKSLwYgT00i+dFSBcei584fpyn25gj120ndmB9RH+9QXFQZ s++zrzuYoi3obFujAc7G26o8QmRppTIfXrfEY+/p+bNRAT/4u6//VwjM6wGDIFneRbC/DLy7RXOiI nIFw3lbSGkCRXpuBpv5eVEn4JPPjD9clBEScJrFzbQdGjFWSOW+ua9yixx0P1nxzMMUlqUlqNEVYK Ij7NJDoagk98OHgHD71bmLO4kEND4urXG90J8AwLl7ATufTQzDEpJmj4g8rtJ/0tBnLGMvAWm1yeQ NsUy3SUA==; 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 1csR8o-0005qD-RO; Mon, 27 Mar 2017 09:40:46 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1csR7z-0003ju-A0 for linux-arm-kernel@lists.infradead.org; Mon, 27 Mar 2017 09:40:01 +0000 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2D7334DAF8; Mon, 27 Mar 2017 09:33:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 2D7334DAF8 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 2D7334DAF8 Received: from localhost.localdomain.com (ovpn-117-27.ams2.redhat.com [10.36.117.27]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3C24117C46; Mon, 27 Mar 2017 09:33:00 +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 v4 21/22] KVM: arm64: ITS: Device table save/restore Date: Mon, 27 Mar 2017 11:31:11 +0200 Message-Id: <1490607072-21610-22-git-send-email-eric.auger@redhat.com> In-Reply-To: <1490607072-21610-1-git-send-email-eric.auger@redhat.com> References: <1490607072-21610-1-git-send-email-eric.auger@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Mon, 27 Mar 2017 09:33:04 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170327_023955_554299_09FBF6A5 X-CRM114-Status: GOOD ( 19.32 ) 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 This patch flushes the device table entries into guest RAM. Both flat table and 2 stage tables are supported. DeviceId indexing is used. For each device listed in the device table, we also flush the translation table using the vgic_its_flush/restore_itt routines. On restore, devices are re-allocated and their itte are re-built. Signed-off-by: Eric Auger --- v3 -> v4: - use the new proto for its_alloc_device - compute_next_devid_offset, vgic_its_flush/restore_itt become static in this patch - change in the DTE entry format with the introduction of the valid bit and next field width decrease; ittaddr encoded on its full range - fix handle_l1_entry entry handling - correct vgic_its_table_restore error handling v2 -> v3: - fix itt_addr bitmask in vgic_its_restore_dte - addition of return 0 in vgic_its_restore_ite moved to the ITE related patch v1 -> v2: - use 8 byte format for DTE and ITE - support 2 stage format - remove kvm parameter - ITT flush/restore moved in a separate patch - use deviceid indexing --- virt/kvm/arm/vgic/vgic-its.c | 161 +++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 156 insertions(+), 5 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 02c0694..a516bbb 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -1693,7 +1693,8 @@ int vgic_its_attr_regs_access(struct kvm_device *dev, return ret; } -u32 compute_next_devid_offset(struct list_head *h, struct its_device *dev) +static u32 compute_next_devid_offset(struct list_head *h, + struct its_device *dev) { struct list_head *e = &dev->dev_list; struct its_device *next; @@ -1884,7 +1885,7 @@ static int vgic_its_restore_ite(struct vgic_its *its, u32 event_id, return 0; } -int vgic_its_flush_itt(struct vgic_its *its, struct its_device *device) +static int vgic_its_flush_itt(struct vgic_its *its, struct its_device *device) { gpa_t base = device->itt_addr; struct its_ite *ite; @@ -1900,7 +1901,7 @@ int vgic_its_flush_itt(struct vgic_its *its, struct its_device *device) return 0; } -int vgic_its_restore_itt(struct vgic_its *its, struct its_device *dev) +static int vgic_its_restore_itt(struct vgic_its *its, struct its_device *dev) { size_t max_size = BIT_ULL(dev->nb_eventid_bits) * VITS_ESZ; gpa_t base = dev->itt_addr; @@ -1917,12 +1918,141 @@ int vgic_its_restore_itt(struct vgic_its *its, struct its_device *dev) } /** + * vgic_its_flush_dte - Flush a device table entry at a given GPA + * + * @its: ITS handle + * @dev: ITS device + * @ptr: GPA + */ +static int vgic_its_flush_dte(struct vgic_its *its, + struct its_device *dev, gpa_t ptr) +{ + struct kvm *kvm = its->dev->kvm; + u64 val, itt_addr_field; + int ret; + u32 next_offset; + + itt_addr_field = dev->itt_addr >> 8; + next_offset = compute_next_devid_offset(&its->device_list, dev); + val = (1ULL << 63 | ((u64)next_offset << 49) | (itt_addr_field << 5) | + (dev->nb_eventid_bits - 1)); + val = cpu_to_le64(val); + ret = kvm_write_guest(kvm, ptr, &val, 8); + return ret; +} + +/** + * vgic_its_restore_dte - restore a device table entry + * + * @its: its handle + * @id: device id the DTE corresponds to + * @ptr: kernel VA where the 8 byte DTE is located + * @opaque: unused + * @next: offset to the next valid device id + * + * Return: < 0 on error, 0 otherwise + */ +static int vgic_its_restore_dte(struct vgic_its *its, u32 id, + void *ptr, void *opaque, u32 *next) +{ + struct its_device *dev; + gpa_t itt_addr; + u8 nb_eventid_bits; + u64 entry = *(u64 *)ptr; + bool valid; + int ret; + + entry = le64_to_cpu(entry); + + valid = entry >> 63; + nb_eventid_bits = (entry & GENMASK_ULL(4, 0)) + 1; + itt_addr = ((entry & GENMASK_ULL(48, 5)) >> 5) << 8; + *next = 1; + + if (!valid) + return 0; + + /* dte entry is valid */ + *next = (entry & GENMASK_ULL(62, 49)) >> 49; + + ret = vgic_its_alloc_device(its, &dev, id, + itt_addr, nb_eventid_bits); + if (ret) + return ret; + ret = vgic_its_restore_itt(its, dev); + + return ret; +} + +/** * vgic_its_flush_device_tables - flush the device table and all ITT * into guest RAM + * + * L1/L2 handling is hidden by vgic_its_check_id() helper which directly + * returns the GPA of the device entry */ static int vgic_its_flush_device_tables(struct vgic_its *its) { - return -ENXIO; + struct its_device *dev; + u64 baser; + + baser = its->baser_device_table; + + list_for_each_entry(dev, &its->device_list, dev_list) { + int ret; + gpa_t eaddr; + + if (!vgic_its_check_id(its, baser, + dev->device_id, &eaddr)) + return -EINVAL; + + ret = vgic_its_flush_itt(its, dev); + if (ret) + return ret; + + ret = vgic_its_flush_dte(its, dev, eaddr); + if (ret) + return ret; + } + return 0; +} + +/** + * handle_l1_entry - callback used for L1 entries (2 stage case) + * + * @its: its handle + * @id: id + * @addr: kernel VA + * @opaque: unused + * @next_offset: offset to the next L1 entry: 0 if the last element + * was found, 1 otherwise + */ +static int handle_l1_entry(struct vgic_its *its, u32 id, void *addr, + void *opaque, u32 *next_offset) +{ + int l2_start_id = id * (SZ_64K / GITS_LVL1_ENTRY_SIZE); + u64 entry = *(u64 *)addr; + gpa_t gpa; + int ret; + + entry = le64_to_cpu(entry); + *next_offset = 1; + + if (!(entry & BIT_ULL(63))) + return 0; + + gpa = entry & GENMASK_ULL(51, 16); + + ret = lookup_table(its, gpa, SZ_64K, 8, + l2_start_id, vgic_its_restore_dte, NULL); + + if (ret == 1) { + /* last entry was found in this L2 table */ + *next_offset = 0; + ret = 0; + } + + return ret; } /** @@ -1931,7 +2061,28 @@ static int vgic_its_flush_device_tables(struct vgic_its *its) */ static int vgic_its_restore_device_tables(struct vgic_its *its) { - return -ENXIO; + u64 baser = its->baser_device_table; + int l1_tbl_size = GITS_BASER_NR_PAGES(baser) * SZ_64K; + int l1_esz = GITS_BASER_ENTRY_SIZE(baser); + gpa_t l1_gpa; + int ret; + + l1_gpa = BASER_ADDRESS(baser); + if (!l1_gpa) + return 0; + + if (baser & GITS_BASER_INDIRECT) + ret = lookup_table(its, l1_gpa, l1_tbl_size, 8, 0, + handle_l1_entry, NULL); + else + ret = lookup_table(its, l1_gpa, l1_tbl_size, l1_esz, + 0, vgic_its_restore_dte, NULL); + + if (ret < 0) + return ret; + + /* if last element was not found we have an issue here */ + return ret ? 0 : -EINVAL; } static int vgic_its_flush_cte(struct vgic_its *its,