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[209.132.183.28]) by mx.google.com with ESMTPS id z11si1116387qkz.141.2019.03.14.07.15.01 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Mar 2019 07:15:01 -0700 (PDT) Received-SPF: pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id ABDBA3003099; Thu, 14 Mar 2019 14:15:00 +0000 (UTC) Received: from [10.36.117.188] (ovpn-117-188.ams2.redhat.com [10.36.117.188]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5BAFF19C65; Thu, 14 Mar 2019 14:14:57 +0000 (UTC) Subject: Re: [Xen-devel] xen: Can't insert balloon page into VM userspace (WAS Re: [linux-linus bisection] complete test-arm64-arm64-xl-xsm) To: Julien Grall , Juergen Gross , Boris Ostrovsky , Andrew Cooper , Matthew Wilcox Cc: k.khlebnikov@samsung.com, Stefano Stabellini , Kees Cook , Konrad Rzeszutek Wilk , "VMware, Inc." , osstest service owner , "linux-kernel@vger.kernel.org" , linux-mm@kvack.org, Julien Freche , Nadav Amit , xen-devel@lists.xenproject.org References: <80211e70-5f54-9421-8e8f-2a4fc758ce39@arm.com> <46118631-61d4-adb6-6ffc-4e7c62ea3da9@arm.com> <20190312171421.GJ19508@bombadil.infradead.org> <45323ea0-2a50-8891-830e-e1f8a8ed23ea@citrix.com> <9a40e1ff-7605-e822-a1d2-502a12d0fba7@redhat.com> <6f8aca6c-355b-7862-75aa-68fe566f76fb@redhat.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Thu, 14 Mar 2019 14:15:00 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 14.03.19 15:12, Julien Grall wrote: > Hi, > > On 3/14/19 8:37 AM, Juergen Gross wrote: >> On 12/03/2019 20:46, David Hildenbrand wrote: >>> On 12.03.19 19:23, David Hildenbrand wrote: >>> >>> I guess something like this could do the trick if I understood it correctly: >>> >>> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c >>> index 39b229f9e256..d37dd5bb7a8f 100644 >>> --- a/drivers/xen/balloon.c >>> +++ b/drivers/xen/balloon.c >>> @@ -604,6 +604,7 @@ int alloc_xenballooned_pages(int nr_pages, struct >>> page **pages) >>> while (pgno < nr_pages) { >>> page = balloon_retrieve(true); >>> if (page) { >>> + __ClearPageOffline(page); >>> pages[pgno++] = page; >>> #ifdef CONFIG_XEN_HAVE_PVMMU >>> /* >>> @@ -645,8 +646,10 @@ void free_xenballooned_pages(int nr_pages, struct >>> page **pages) >>> mutex_lock(&balloon_mutex); >>> >>> for (i = 0; i < nr_pages; i++) { >>> - if (pages[i]) >>> + if (pages[i]) { >>> + __SetPageOffline(pages[i]); >>> balloon_append(pages[i]); >>> + } >>> } >>> >>> balloon_stats.target_unpopulated -= nr_pages; >>> >>> >>> At least this way, the pages allocated (and thus eventually mapped to >>> user space) would not be marked, but the other ones would remain marked >>> and could be excluded by makedumptool. >>> >> >> I think this patch should do the trick. Julien, could you give it a >> try? On x86 I can't reproduce your problem easily as dom0 is PV with >> plenty of unpopulated pages for grant memory not suffering from >> missing "offline" bit. > > Sure. I managed to get the console working with the patch suggested by > David. Feel free to add my tested-by if when you resend it as is. > Thanks, I will send as proper patch later! Cheers! > Cheers, > -- Thanks, David / dhildenb