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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 0AAC5D0BB56 for ; Fri, 25 Oct 2024 15:35:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=8W9FJinAhOzhMxDmMk4QlZHe2QdhhjCW/xbWoyWrqtU=; b=ULUnwW33eh1p1H Eejn/zQlUmM8Vkv7Yjz/JU92ZO83zp/5vIdgxr282agTjfSyCLA4QBMIBxuLx1Lqsf9Tw74GoPQbu /J81G5cB2sIyLTy6QXNpE3uAx5ZGgYM9WCl7zklQFuczNyPnF3l/bXmPHFHcEEyAgiQuAPHjLQqcC 71Or8JAQpxRyQ25u2EMK82au6yKi/kg+au7sfY872Bx+v+xbQe1LgQJ95+VWxJt1hO+MDr8h6tYYo KEIe5EIQZzdMwudtMr48QjhvxwBiAPXcLP+c7R8jnQygGZkxOSjHbdB/D4t+HPtWBb2yCa5pnlU9q MZqrKmNBkcX4KJes0zUw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t4MLb-00000004GXw-0Ley; Fri, 25 Oct 2024 15:35:31 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t4M02-00000004B8n-139t for kexec@lists.infradead.org; Fri, 25 Oct 2024 15:13:15 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729869193; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mE6UZtvB4UrwqxDxBvXj02Eqawd4qPQUjTyB3c978sA=; b=C0GH3MEkilMRvBMAFnW1Bh45TU0I/NqYsUGs4uYd/jvsTqaa8CRF3DrXtmWtQqjuSl8z/Z ezDLmv6iZ7I5FtHnmt33OlslhxlSNI7N8u1dApSgHxUB60OjHp+V7siWYLzZjXcUsyJQCg exR5FeJI54alCP9Nxrtxre+xhs6oTXg= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-373-3cSc-QklMMuKHb2DIsw0Pg-1; Fri, 25 Oct 2024 11:13:10 -0400 X-MC-Unique: 3cSc-QklMMuKHb2DIsw0Pg-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A10BC1955D4A; Fri, 25 Oct 2024 15:13:08 +0000 (UTC) Received: from t14s.redhat.com (unknown [10.22.65.27]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 86CEF300018D; Fri, 25 Oct 2024 15:13:01 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-s390@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, kexec@lists.infradead.org, David Hildenbrand , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Baoquan He , Vivek Goyal , Dave Young , Thomas Huth , Cornelia Huck , Janosch Frank , Claudio Imbrenda , Eric Farman , Andrew Morton Subject: [PATCH v1 10/11] virtio-mem: support CONFIG_PROC_VMCORE_DEVICE_RAM Date: Fri, 25 Oct 2024 17:11:32 +0200 Message-ID: <20241025151134.1275575-11-david@redhat.com> In-Reply-To: <20241025151134.1275575-1-david@redhat.com> References: <20241025151134.1275575-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241025_081314_390379_9E38DCB7 X-CRM114-Status: GOOD ( 19.20 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org Let's implement the get_device_ram() vmcore callback, so architectures that select NEED_PROC_VMCORE_NEED_DEVICE_RAM, like s390 soon, can include that memory in a crash dump. Merge ranges, and process ranges that might contain a mixture of plugged and unplugged, to reduce the total number of ranges. Signed-off-by: David Hildenbrand --- drivers/virtio/Kconfig | 1 + drivers/virtio/virtio_mem.c | 88 +++++++++++++++++++++++++++++++++++++ 2 files changed, 89 insertions(+) diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig index 2eb747311bfd..60fdaf2c2c49 100644 --- a/drivers/virtio/Kconfig +++ b/drivers/virtio/Kconfig @@ -128,6 +128,7 @@ config VIRTIO_MEM depends on MEMORY_HOTREMOVE depends on CONTIG_ALLOC depends on EXCLUSIVE_SYSTEM_RAM + select PROVIDE_PROC_VMCORE_DEVICE_RAM if PROC_VMCORE help This driver provides access to virtio-mem paravirtualized memory devices, allowing to hotplug and hotunplug memory. diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index 73477d5b79cf..1ae1199a7617 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -2728,6 +2728,91 @@ static bool virtio_mem_vmcore_pfn_is_ram(struct vmcore_cb *cb, mutex_unlock(&vm->hotplug_mutex); return is_ram; } + +#ifdef CONFIG_PROC_VMCORE_DEVICE_RAM +static int virtio_mem_vmcore_add_device_ram(struct virtio_mem *vm, + struct list_head *list, uint64_t start, uint64_t end) +{ + int rc; + + rc = vmcore_alloc_add_mem_node(list, start, end - start); + if (rc) + dev_err(&vm->vdev->dev, + "Error adding device RAM range: %d\n", rc); + return rc; +} + +static int virtio_mem_vmcore_get_device_ram(struct vmcore_cb *cb, + struct list_head *list) +{ + struct virtio_mem *vm = container_of(cb, struct virtio_mem, + vmcore_cb); + const uint64_t device_start = vm->addr; + const uint64_t device_end = vm->addr + vm->usable_region_size; + uint64_t chunk_size, cur_start, cur_end, plugged_range_start = 0; + LIST_HEAD(tmp_list); + int rc; + + if (!vm->plugged_size) + return 0; + + /* Process memory sections, unless the device block size is bigger. */ + chunk_size = max_t(uint64_t, PFN_PHYS(PAGES_PER_SECTION), + vm->device_block_size); + + mutex_lock(&vm->hotplug_mutex); + + /* + * We process larger chunks and indicate the complete chunk if any + * block in there is plugged. This reduces the number of pfn_is_ram() + * callbacks and mimic what is effectively being done when the old + * kernel would add complete memory sections/blocks to the elfcore hdr. + */ + cur_start = device_start; + for (cur_start = device_start; cur_start < device_end; cur_start = cur_end) { + cur_end = ALIGN_DOWN(cur_start + chunk_size, chunk_size); + cur_end = min_t(uint64_t, cur_end, device_end); + + rc = virtio_mem_send_state_request(vm, cur_start, + cur_end - cur_start); + + if (rc < 0) { + dev_err(&vm->vdev->dev, + "Error querying block states: %d\n", rc); + goto out; + } else if (rc != VIRTIO_MEM_STATE_UNPLUGGED) { + /* Merge ranges with plugged memory. */ + if (!plugged_range_start) + plugged_range_start = cur_start; + continue; + } + + /* Flush any plugged range. */ + if (plugged_range_start) { + rc = virtio_mem_vmcore_add_device_ram(vm, &tmp_list, + plugged_range_start, + cur_start); + if (rc) + goto out; + plugged_range_start = 0; + } + } + + /* Flush any plugged range. */ + if (plugged_range_start) + rc = virtio_mem_vmcore_add_device_ram(vm, &tmp_list, + plugged_range_start, + cur_start); +out: + mutex_unlock(&vm->hotplug_mutex); + if (rc < 0) { + vmcore_free_mem_nodes(&tmp_list); + return rc; + } + list_splice_tail(&tmp_list, list); + return 0; +} +#endif /* CONFIG_PROC_VMCORE_DEVICE_RAM */ #endif /* CONFIG_PROC_VMCORE */ static int virtio_mem_init_kdump(struct virtio_mem *vm) @@ -2737,6 +2822,9 @@ static int virtio_mem_init_kdump(struct virtio_mem *vm) #ifdef CONFIG_PROC_VMCORE dev_info(&vm->vdev->dev, "memory hot(un)plug disabled in kdump kernel\n"); vm->vmcore_cb.pfn_is_ram = virtio_mem_vmcore_pfn_is_ram; +#ifdef CONFIG_PROC_VMCORE_DEVICE_RAM + vm->vmcore_cb.get_device_ram = virtio_mem_vmcore_get_device_ram; +#endif /* CONFIG_PROC_VMCORE_DEVICE_RAM */ register_vmcore_cb(&vm->vmcore_cb); return 0; #else /* CONFIG_PROC_VMCORE */ -- 2.46.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec