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 X-Spam-Level: X-Spam-Status: No, score=-5.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 105D5C433DF for ; Tue, 9 Jun 2020 13:11:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9AAD20734 for ; Tue, 9 Jun 2020 13:11:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gYPKy/KG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728193AbgFINLl (ORCPT ); Tue, 9 Jun 2020 09:11:41 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:59128 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726083AbgFINLk (ORCPT ); Tue, 9 Jun 2020 09:11:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591708297; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=14i4pgJ1cKRxt/SIZY3SGbyK+x6E5qdVnQdLD8Wr0Ac=; b=gYPKy/KGyOkrUSAOuLHPycQhYLe86VJn7WQMZA6KS4mmx2ITviNXy5TIZxBHrugImyuvl1 MVgA+38Cx7ksolLGXHM7MCH2vABO6cPO9Lnv1gNv+EuyF26ldtEtg3VbsoyV5lhKAiYErl jlJClR8cMkMOGzI5Ihm80uOUcDWVaa0= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-277-zAjx_Hn9OE2O2imoDP1KTQ-1; Tue, 09 Jun 2020 09:11:26 -0400 X-MC-Unique: zAjx_Hn9OE2O2imoDP1KTQ-1 Received: by mail-wr1-f69.google.com with SMTP id n6so8613208wrv.6 for ; Tue, 09 Jun 2020 06:11:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=14i4pgJ1cKRxt/SIZY3SGbyK+x6E5qdVnQdLD8Wr0Ac=; b=j/IvxPGiknDwsa0oWgMF4wJnf74rZ51F6qNDMUkQbtHQ+PuivXuhg440XjLza9NgcH vB4LmSoILqqVSbTKcyuiM0jA364ERE0JLF6+bSWdlHD9fIdSXYB/ofK2tRLhT07wXber 4/mTo/2tBRXuO9GuEQW2xEQUDAwKmpAAHc09Lw1e5k6Y8wCBZp/ZwHluYTDT+Ec4c68j xaOIOosFKe2q2wS++6c9yTmMmI42A37fTvzWwzSQPZVymDVAKxDzTO+FFTfgGIxyarFy 8F5zqk3Z42/gbJFX6NJPl+S9A0QoFsA5rU55hxyGy9cMsdca5g0dq7f1iHBsFKDzSri+ 59kQ== X-Gm-Message-State: AOAM532St8WwFHLtZs7qFRyCO2xRDz9MGp7HWLCuF/CgdYLyASuFI1xG aJ8ZWYq7un5Ige7GOoUI6h48jWzeAsC0+2YCZs4wGD5Y1lOQ603vujHzABQyWxFGU07e09AWb2P e8Ya2jiM/iUgw X-Received: by 2002:a5d:4fc4:: with SMTP id h4mr4254412wrw.49.1591708285164; Tue, 09 Jun 2020 06:11:25 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzp5N1qCGoHea3ZDXEjbB8ru/PidP9Mj1IZXGKzhzacYZ4oc6CGuCHF1zzGW4rDHdsY1crdBA== X-Received: by 2002:a5d:4fc4:: with SMTP id h4mr4254378wrw.49.1591708284871; Tue, 09 Jun 2020 06:11:24 -0700 (PDT) Received: from redhat.com (bzq-79-181-55-232.red.bezeqint.net. [79.181.55.232]) by smtp.gmail.com with ESMTPSA id c16sm3461288wrx.4.2020.06.09.06.11.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jun 2020 06:11:24 -0700 (PDT) Date: Tue, 9 Jun 2020 09:11:20 -0400 From: "Michael S. Tsirkin" To: David Hildenbrand Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, qemu-s390x@nongnu.org, Richard Henderson , Paolo Bonzini , "Dr . David Alan Gilbert" , Eduardo Habkost , teawater , Pankaj Gupta , Alex Williamson , Christian Borntraeger , Cornelia Huck , Eric Blake , Eric Farman , Hailiang Zhang , Halil Pasic , Igor Mammedov , Janosch Frank , Juan Quintela , Keith Busch , Marcel Apfelbaum , Markus Armbruster , Peter Maydell , Pierre Morel , Tony Krowiak Subject: Re: [PATCH v3 00/20] virtio-mem: Paravirtualized memory hot(un)plug Message-ID: <20200609091034-mutt-send-email-mst@kernel.org> References: <20200603144914.41645-1-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200603144914.41645-1-david@redhat.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Wed, Jun 03, 2020 at 04:48:54PM +0200, David Hildenbrand wrote: > This is the very basic, initial version of virtio-mem. More info on > virtio-mem in general can be found in the Linux kernel driver v2 posting > [1] and in patch #10. The latest Linux driver v4 can be found at [2]. > > This series is based on [3]: > "[PATCH v1] pc: Support coldplugging of virtio-pmem-pci devices on all > buses" > > The patches can be found at: > https://github.com/davidhildenbrand/qemu.git virtio-mem-v3 So given we tweaked the config space a bit, this needs a respin. > "The basic idea of virtio-mem is to provide a flexible, > cross-architecture memory hot(un)plug solution that avoids many limitations > imposed by existing technologies, architectures, and interfaces." > > There are a lot of addons in the works (esp. protection of unplugged > memory, better hugepage support (esp. when reading unplugged memory), > resizeable memory backends, support for more architectures, ...), this is > the very basic version to get the ball rolling. > > The first 8 patches make sure we don't have any sudden surprises e.g., if > somebody tries to pin all memory in RAM blocks, resulting in a higher > memory consumption than desired. The remaining patches add basic virtio-mem > along with support for x86-64. > > > Note: Since commit 7d2ef6dcc1cf ("hmp: Simplify qom-set"), the behavior of > qom-set changed and we can no longer pass proper sizes (e.g., 300M). The > description in patch #10 is outdated - but I hope that we'll bring back the > old behaviour, so I kept it for now :) > > [1] https://lkml.kernel.org/r/20200311171422.10484-1-david@redhat.com > [2] https://lkml.kernel.org/r/20200507140139.17083-1-david@redhat.com > [3] https://lkml.kernel.org/r/20200525084511.51379-1-david@redhat.com > > Cc: teawater > Cc: Pankaj Gupta > > v2 -> v3: > - Rebased on upstream/[3] > - "virtio-mem: Exclude unplugged memory during migration" > -- Added > - "virtio-mem: Paravirtualized memory hot(un)plug" > -- Simplify bitmap operations, find consecutive areas > -- Tweak error messages > -- Reshuffle some checks > -- Minor cleanups > - "accel/kvm: Convert to ram_block_discard_disable()" > - "target/i386: sev: Use ram_block_discard_disable()" > -- Keep asserts clean of functional things > > v1 -> v2: > - Rebased to object_property_*() changes > - "exec: Introduce ram_block_discard_(disable|require)()" > -- Change the function names and rephrase/add comments > - "virtio-balloon: Rip out qemu_balloon_inhibit()" > -- Add and use "migration_in_incoming_postcopy()" > - "migration/rdma: Use ram_block_discard_disable()" > -- Add a comment regarding pin_all vs. !pin_all > - "virtio-mem: Paravirtualized memory hot(un)plug" > -- Replace virtio_mem_discard_inhibited() by > migration_in_incoming_postcopy() > -- Drop some asserts > -- Drop virtio_mem_bad_request(), use virtio_error() directly, printing > more information > -- Replace "Note: Discarding should never fail ..." comments by > error_report() > -- Replace virtio_stw_p() by cpu_to_le16() > -- Drop migration_addr and migration_block_size > -- Minor cleanups > - "linux-headers: update to contain virtio-mem" > -- Updated to latest v4 in Linux > - General changes > -- Fixup the users of the renamed ram_block_discard_(disable|require) > -- Use "X: cannot disable RAM discard"-styled error messages > - Added > -- "virtio-mem: Migration sanity checks" > -- "virtio-mem: Add trace events" > > David Hildenbrand (20): > exec: Introduce ram_block_discard_(disable|require)() > vfio: Convert to ram_block_discard_disable() > accel/kvm: Convert to ram_block_discard_disable() > s390x/pv: Convert to ram_block_discard_disable() > virtio-balloon: Rip out qemu_balloon_inhibit() > target/i386: sev: Use ram_block_discard_disable() > migration/rdma: Use ram_block_discard_disable() > migration/colo: Use ram_block_discard_disable() > linux-headers: update to contain virtio-mem > virtio-mem: Paravirtualized memory hot(un)plug > virtio-pci: Proxy for virtio-mem > MAINTAINERS: Add myself as virtio-mem maintainer > hmp: Handle virtio-mem when printing memory device info > numa: Handle virtio-mem in NUMA stats > pc: Support for virtio-mem-pci > virtio-mem: Allow notifiers for size changes > virtio-pci: Send qapi events when the virtio-mem size changes > virtio-mem: Migration sanity checks > virtio-mem: Add trace events > virtio-mem: Exclude unplugged memory during migration > > MAINTAINERS | 8 + > accel/kvm/kvm-all.c | 4 +- > balloon.c | 17 - > exec.c | 52 ++ > hw/core/numa.c | 6 + > hw/i386/Kconfig | 1 + > hw/i386/pc.c | 49 +- > hw/s390x/s390-virtio-ccw.c | 22 +- > hw/vfio/ap.c | 10 +- > hw/vfio/ccw.c | 11 +- > hw/vfio/common.c | 53 +- > hw/vfio/pci.c | 6 +- > hw/virtio/Kconfig | 11 + > hw/virtio/Makefile.objs | 2 + > hw/virtio/trace-events | 10 + > hw/virtio/virtio-balloon.c | 8 +- > hw/virtio/virtio-mem-pci.c | 157 ++++ > hw/virtio/virtio-mem-pci.h | 34 + > hw/virtio/virtio-mem.c | 876 ++++++++++++++++++++ > include/exec/memory.h | 41 + > include/hw/pci/pci.h | 1 + > include/hw/vfio/vfio-common.h | 4 +- > include/hw/virtio/virtio-mem.h | 86 ++ > include/migration/colo.h | 2 +- > include/migration/misc.h | 2 + > include/standard-headers/linux/virtio_ids.h | 1 + > include/standard-headers/linux/virtio_mem.h | 211 +++++ > include/sysemu/balloon.h | 2 - > migration/migration.c | 15 +- > migration/postcopy-ram.c | 23 - > migration/rdma.c | 18 +- > migration/savevm.c | 11 +- > monitor/hmp-cmds.c | 16 + > monitor/monitor.c | 1 + > qapi/misc.json | 64 +- > target/i386/sev.c | 7 + > 36 files changed, 1721 insertions(+), 121 deletions(-) > create mode 100644 hw/virtio/virtio-mem-pci.c > create mode 100644 hw/virtio/virtio-mem-pci.h > create mode 100644 hw/virtio/virtio-mem.c > create mode 100644 include/hw/virtio/virtio-mem.h > create mode 100644 include/standard-headers/linux/virtio_mem.h > > -- > 2.25.4 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 X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB464C433E0 for ; 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[79.181.55.232]) by smtp.gmail.com with ESMTPSA id c16sm3461288wrx.4.2020.06.09.06.11.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jun 2020 06:11:24 -0700 (PDT) Date: Tue, 9 Jun 2020 09:11:20 -0400 From: "Michael S. Tsirkin" To: David Hildenbrand Subject: Re: [PATCH v3 00/20] virtio-mem: Paravirtualized memory hot(un)plug Message-ID: <20200609091034-mutt-send-email-mst@kernel.org> References: <20200603144914.41645-1-david@redhat.com> MIME-Version: 1.0 In-Reply-To: <20200603144914.41645-1-david@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=205.139.110.120; envelope-from=mst@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/09 02:44:16 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , kvm@vger.kernel.org, qemu-devel@nongnu.org, teawater , Janosch Frank , Juan Quintela , Markus Armbruster , Halil Pasic , Christian Borntraeger , Richard Henderson , Eric Farman , Eduardo Habkost , "Dr . David Alan Gilbert" , Alex Williamson , Paolo Bonzini , Keith Busch , Hailiang Zhang , Tony Krowiak , Pankaj Gupta , Pierre Morel , Cornelia Huck , qemu-s390x@nongnu.org, Igor Mammedov Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, Jun 03, 2020 at 04:48:54PM +0200, David Hildenbrand wrote: > This is the very basic, initial version of virtio-mem. More info on > virtio-mem in general can be found in the Linux kernel driver v2 posting > [1] and in patch #10. The latest Linux driver v4 can be found at [2]. > > This series is based on [3]: > "[PATCH v1] pc: Support coldplugging of virtio-pmem-pci devices on all > buses" > > The patches can be found at: > https://github.com/davidhildenbrand/qemu.git virtio-mem-v3 So given we tweaked the config space a bit, this needs a respin. > "The basic idea of virtio-mem is to provide a flexible, > cross-architecture memory hot(un)plug solution that avoids many limitations > imposed by existing technologies, architectures, and interfaces." > > There are a lot of addons in the works (esp. protection of unplugged > memory, better hugepage support (esp. when reading unplugged memory), > resizeable memory backends, support for more architectures, ...), this is > the very basic version to get the ball rolling. > > The first 8 patches make sure we don't have any sudden surprises e.g., if > somebody tries to pin all memory in RAM blocks, resulting in a higher > memory consumption than desired. The remaining patches add basic virtio-mem > along with support for x86-64. > > > Note: Since commit 7d2ef6dcc1cf ("hmp: Simplify qom-set"), the behavior of > qom-set changed and we can no longer pass proper sizes (e.g., 300M). The > description in patch #10 is outdated - but I hope that we'll bring back the > old behaviour, so I kept it for now :) > > [1] https://lkml.kernel.org/r/20200311171422.10484-1-david@redhat.com > [2] https://lkml.kernel.org/r/20200507140139.17083-1-david@redhat.com > [3] https://lkml.kernel.org/r/20200525084511.51379-1-david@redhat.com > > Cc: teawater > Cc: Pankaj Gupta > > v2 -> v3: > - Rebased on upstream/[3] > - "virtio-mem: Exclude unplugged memory during migration" > -- Added > - "virtio-mem: Paravirtualized memory hot(un)plug" > -- Simplify bitmap operations, find consecutive areas > -- Tweak error messages > -- Reshuffle some checks > -- Minor cleanups > - "accel/kvm: Convert to ram_block_discard_disable()" > - "target/i386: sev: Use ram_block_discard_disable()" > -- Keep asserts clean of functional things > > v1 -> v2: > - Rebased to object_property_*() changes > - "exec: Introduce ram_block_discard_(disable|require)()" > -- Change the function names and rephrase/add comments > - "virtio-balloon: Rip out qemu_balloon_inhibit()" > -- Add and use "migration_in_incoming_postcopy()" > - "migration/rdma: Use ram_block_discard_disable()" > -- Add a comment regarding pin_all vs. !pin_all > - "virtio-mem: Paravirtualized memory hot(un)plug" > -- Replace virtio_mem_discard_inhibited() by > migration_in_incoming_postcopy() > -- Drop some asserts > -- Drop virtio_mem_bad_request(), use virtio_error() directly, printing > more information > -- Replace "Note: Discarding should never fail ..." comments by > error_report() > -- Replace virtio_stw_p() by cpu_to_le16() > -- Drop migration_addr and migration_block_size > -- Minor cleanups > - "linux-headers: update to contain virtio-mem" > -- Updated to latest v4 in Linux > - General changes > -- Fixup the users of the renamed ram_block_discard_(disable|require) > -- Use "X: cannot disable RAM discard"-styled error messages > - Added > -- "virtio-mem: Migration sanity checks" > -- "virtio-mem: Add trace events" > > David Hildenbrand (20): > exec: Introduce ram_block_discard_(disable|require)() > vfio: Convert to ram_block_discard_disable() > accel/kvm: Convert to ram_block_discard_disable() > s390x/pv: Convert to ram_block_discard_disable() > virtio-balloon: Rip out qemu_balloon_inhibit() > target/i386: sev: Use ram_block_discard_disable() > migration/rdma: Use ram_block_discard_disable() > migration/colo: Use ram_block_discard_disable() > linux-headers: update to contain virtio-mem > virtio-mem: Paravirtualized memory hot(un)plug > virtio-pci: Proxy for virtio-mem > MAINTAINERS: Add myself as virtio-mem maintainer > hmp: Handle virtio-mem when printing memory device info > numa: Handle virtio-mem in NUMA stats > pc: Support for virtio-mem-pci > virtio-mem: Allow notifiers for size changes > virtio-pci: Send qapi events when the virtio-mem size changes > virtio-mem: Migration sanity checks > virtio-mem: Add trace events > virtio-mem: Exclude unplugged memory during migration > > MAINTAINERS | 8 + > accel/kvm/kvm-all.c | 4 +- > balloon.c | 17 - > exec.c | 52 ++ > hw/core/numa.c | 6 + > hw/i386/Kconfig | 1 + > hw/i386/pc.c | 49 +- > hw/s390x/s390-virtio-ccw.c | 22 +- > hw/vfio/ap.c | 10 +- > hw/vfio/ccw.c | 11 +- > hw/vfio/common.c | 53 +- > hw/vfio/pci.c | 6 +- > hw/virtio/Kconfig | 11 + > hw/virtio/Makefile.objs | 2 + > hw/virtio/trace-events | 10 + > hw/virtio/virtio-balloon.c | 8 +- > hw/virtio/virtio-mem-pci.c | 157 ++++ > hw/virtio/virtio-mem-pci.h | 34 + > hw/virtio/virtio-mem.c | 876 ++++++++++++++++++++ > include/exec/memory.h | 41 + > include/hw/pci/pci.h | 1 + > include/hw/vfio/vfio-common.h | 4 +- > include/hw/virtio/virtio-mem.h | 86 ++ > include/migration/colo.h | 2 +- > include/migration/misc.h | 2 + > include/standard-headers/linux/virtio_ids.h | 1 + > include/standard-headers/linux/virtio_mem.h | 211 +++++ > include/sysemu/balloon.h | 2 - > migration/migration.c | 15 +- > migration/postcopy-ram.c | 23 - > migration/rdma.c | 18 +- > migration/savevm.c | 11 +- > monitor/hmp-cmds.c | 16 + > monitor/monitor.c | 1 + > qapi/misc.json | 64 +- > target/i386/sev.c | 7 + > 36 files changed, 1721 insertions(+), 121 deletions(-) > create mode 100644 hw/virtio/virtio-mem-pci.c > create mode 100644 hw/virtio/virtio-mem-pci.h > create mode 100644 hw/virtio/virtio-mem.c > create mode 100644 include/hw/virtio/virtio-mem.h > create mode 100644 include/standard-headers/linux/virtio_mem.h > > -- > 2.25.4