From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by 2002:ac2:5937:0:0:0:0:0 with SMTP id v23csp4074669lfi; Tue, 31 Mar 2020 08:05:01 -0700 (PDT) X-Google-Smtp-Source: ADFU+vuzF4v/EqjpQuHuY2KPC8+9CiFmE5/hixLVUrhRBwZsN9ijasM20d4vwV7cwRGVkvN73CIp X-Received: by 2002:a37:8046:: with SMTP id b67mr5362026qkd.207.1585667099961; Tue, 31 Mar 2020 08:04:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1585667099; cv=none; d=google.com; s=arc-20160816; b=JMyUNOCbhavwbNv77dEcb45F6kF2fZJ+AYxi5iEtgWBrtNFPgWUweBwdFE52Av2BKs 3+WNY8vbDCn6FQCAGRmpdy/O/AapMfpIIwwKzI2aRIYierJRBkN6K0szOFLNL7433wX4 IYNAQvcZjdXxUMPKeB7hgsJ5SOQ9pHog70gYBtL41ZjHJNrNmn4+SkXv4W7iHZ3/53hO 9/9KABvzhYtUKFoYHMASWZpLYtfhfoIroFoGxr4T9E5Cl36pa6cCYOthkJwd0q8FyqUV EUE3a5krfOKj3+feHFSNSxVm5T1w60iYzL8u+ktLBX+VINwbdxb4iButG5BJZsrH8ivt z4hQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:cc:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-disposition :content-transfer-encoding:in-reply-to:mime-version:references :message-id:subject:to:from:date:dkim-signature; bh=FaJkiz10NQw9jlC+Kjcb9efmme9Mt48arhxpbww3o7w=; b=jNv54qj0oRUoju10SG1WcWTe32hJj+wW0cYy2NATMZlBqUb83ibwlDwqyGFtf/VZCb 7PCj23rzAosIBuuKHZHs//Hp22FIwVA+JRaI7P2NiUi1ygqc95xRNIOjnRSkLgjhVpww Q/2lhsKkpxugyFP2old+0MyIMS4FfmfntnnvaGG1nKIYvj7f2q6mdSiv/JlhdOWotRI2 Yb3ASosTMtnvLjP6MVfdWuphEO6SyrCxleQS1A8KZ8+xD9K1tqWGfb9i2sXu0HFkvRw5 BYyUcdzp+am7ofxF4/+MGifYgYuLsPltYDxQ88h89v7o2j6mXKr6CJATh4TGCp6cz8oF ZqMg== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=L5Kd1wu0; spf=pass (google.com: domain of qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org. [209.51.188.17]) by mx.google.com with ESMTPS id e41si10229324qtk.202.2020.03.31.08.04.59 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 31 Mar 2020 08:04:59 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=L5Kd1wu0; spf=pass (google.com: domain of qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:39742 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jJIRm-0003MK-UX for alex.bennee@linaro.org; Tue, 31 Mar 2020 11:04:58 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57451) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jJIQ5-0001BQ-Ss for qemu-devel@nongnu.org; Tue, 31 Mar 2020 11:03:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jJIQ4-00016p-4E for qemu-devel@nongnu.org; Tue, 31 Mar 2020 11:03:13 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:22490 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jJIQ3-00016V-Vy for qemu-devel@nongnu.org; Tue, 31 Mar 2020 11:03:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585666991; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=FaJkiz10NQw9jlC+Kjcb9efmme9Mt48arhxpbww3o7w=; b=L5Kd1wu0RMnriEj+o17EoIPwreBIB2kNGead2pqpTz1/nqaWLQgOFeEYHFe6MeqR5j1BlL j4qAYNqo//G/Dw4Ns1hDFe5n3j6nY1ETDGGcXlBtNkYzKkRDNnj4YsWIMqZUkgMcUhSVYe 1Bsw7Uxno6//p4t3cyjFIYssimYXW7k= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-316-UKkID49EMLO_D3Ff1g76Qg-1; Tue, 31 Mar 2020 11:03:09 -0400 X-MC-Unique: UKkID49EMLO_D3Ff1g76Qg-1 Received: by mail-wr1-f70.google.com with SMTP id t25so10746396wrb.16 for ; Tue, 31 Mar 2020 08:03:09 -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=Ulje8nREHKWin46TswSOrg0IkBb6Q1QSROXfvQkX3Ms=; b=uUTaZPDwBqdC8LTTVO9J5ZESmf6AS6ZfobkudjGip83SR6FW3oyJ5tHnWxrZdS5H0h all9jrh9h2E37kVgcgudUWj88L4XN0RuWjYdQ2etsCLxt3ArnAcHqdQFXOPg05w9SB3Q VNpD6hCDRDUWRe8etHr2YP5b8izTsUmSqO41YfNmgcrwASpmrMUoJ6Djhi7ZOgf6Kc9h ldUvNs2Y0oXvVtubafXFXZnw27CgpgxTbOeRAd7Zi8DDgwbbLY81s1YHrPhnIlUt8YQ6 S9cuDLKN3D8Av/86FrDxBL9HIysYVcfxdCXPxQRftgoeq0EReAsbLVYD8MgslZL05ZE0 1hNA== X-Gm-Message-State: ANhLgQ3RjxukCxJuz26aEIr/8arVsGtYZYbDBDqnrG2+zWzTPQQkCzlW TZJI0x2bBZsaKZ00GF6wRpjotMu4EanaFc/iHLUibxs77YyPnqoL5I/92B8/Cij3r0RaE+OAwOV momYBd1zDL6VN28w= X-Received: by 2002:a1c:6745:: with SMTP id b66mr3925923wmc.30.1585666987596; Tue, 31 Mar 2020 08:03:07 -0700 (PDT) X-Received: by 2002:a1c:6745:: with SMTP id b66mr3925889wmc.30.1585666987261; Tue, 31 Mar 2020 08:03:07 -0700 (PDT) Received: from redhat.com (bzq-79-176-51-222.red.bezeqint.net. [79.176.51.222]) by smtp.gmail.com with ESMTPSA id f20sm3908445wmc.35.2020.03.31.08.03.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Mar 2020 08:03:05 -0700 (PDT) Date: Tue, 31 Mar 2020 11:03:02 -0400 From: "Michael S. Tsirkin" To: Shameer Kolothum Subject: Re: [PATCH for-5.0 2/3] fw_cfg: Migrate ACPI table mr sizes separately Message-ID: <20200331110223-mutt-send-email-mst@kernel.org> References: <20200330164909.28324-1-shameerali.kolothum.thodi@huawei.com> <20200330164909.28324-3-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 In-Reply-To: <20200330164909.28324-3-shameerali.kolothum.thodi@huawei.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 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@linaro.org, xiaoguangrong.eric@gmail.com, shannon.zhaosl@gmail.com, david@redhat.com, qemu-devel@nongnu.org, xuwei5@hisilicon.com, linuxarm@huawei.com, eric.auger@redhat.com, qemu-arm@nongnu.org, imammedo@redhat.com, lersek@redhat.com Errors-To: qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-devel" X-TUID: GgsfVpC3p0vS On Mon, Mar 30, 2020 at 05:49:08PM +0100, Shameer Kolothum wrote: > Any sub-page size update to ACPI MRs will be lost during > migration, as we use aligned size in ram_load_precopy() -> > qemu_ram_resize() path. This will result in inconsistency in > FWCfgEntry sizes between source and destination. In order to avoid > this, save and restore them separately during migration. >=20 > Up until now, this problem may not be that relevant for x86 as both > ACPI table and Linker MRs gets padded and aligned. Also at present, > qemu_ram_resize() doesn't invoke callback to update FWCfgEntry for > unaligned size changes. But since we are going to fix the > qemu_ram_resize() in the subsequent patch, the issue may become > more serious especially for RSDP MR case. >=20 > Moreover, the issue will soon become prominent in arm/virt as well > where the MRs are not padded or aligned at all and eventually have > acpi table changes as part of future additions like NVDIMM hot-add > feature. >=20 > Suggested-by: David Hildenbrand > Signed-off-by: Shameer Kolothum > Acked-by: David Hildenbrand > --- > Please find previous discussions here, > https://patchwork.kernel.org/patch/11339591/#23140343 > --- >=20 > hw/core/machine.c | 1 + > hw/nvram/fw_cfg.c | 86 ++++++++++++++++++++++++++++++++++++++- > include/hw/nvram/fw_cfg.h | 6 +++ > 3 files changed, 92 insertions(+), 1 deletion(-) >=20 > diff --git a/hw/core/machine.c b/hw/core/machine.c > index de0c425605..c1a444cb75 100644 > --- a/hw/core/machine.c > +++ b/hw/core/machine.c > @@ -39,6 +39,7 @@ GlobalProperty hw_compat_4_2[] =3D { > { "usb-redir", "suppress-remote-wake", "off" }, > { "qxl", "revision", "4" }, > { "qxl-vga", "revision", "4" }, > + { "fw_cfg", "acpi-mr-restore", "false" }, > }; > const size_t hw_compat_4_2_len =3D G_N_ELEMENTS(hw_compat_4_2); > =20 > diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c > index 179b302f01..36d1e32f83 100644 > --- a/hw/nvram/fw_cfg.c > +++ b/hw/nvram/fw_cfg.c > @@ -39,6 +39,7 @@ > #include "qemu/config-file.h" > #include "qemu/cutils.h" > #include "qapi/error.h" > +#include "hw/acpi/aml-build.h" > =20 > #define FW_CFG_FILE_SLOTS_DFLT 0x20 > =20 > @@ -610,6 +611,50 @@ bool fw_cfg_dma_enabled(void *opaque) > return s->dma_enabled; > } > =20 > +static bool fw_cfg_acpi_mr_restore(void *opaque) > +{ > + FWCfgState *s =3D opaque; > + return s->acpi_mr_restore; How about we limit this to the case where the address is unaligned? > +} > + > +static void fw_cfg_update_mr(FWCfgState *s, uint16_t key, size_t size) > +{ > + MemoryRegion *mr; > + ram_addr_t offset; > + int arch =3D !!(key & FW_CFG_ARCH_LOCAL); > + void *ptr; > + > + key &=3D FW_CFG_ENTRY_MASK; > + assert(key < fw_cfg_max_entry(s)); > + > + ptr =3D s->entries[arch][key].data; > + mr =3D memory_region_from_host(ptr, &offset); > + > + memory_region_ram_resize(mr, size, &error_abort); > +} > + > +static int fw_cfg_acpi_mr_restore_post_load(void *opaque, int version_id= ) > +{ > + FWCfgState *s =3D opaque; > + int i, index; > + > + assert(s->files); > + > + index =3D be32_to_cpu(s->files->count); > + > + for (i =3D 0; i < index; i++) { > + if (!strcmp(s->files->f[i].name, ACPI_BUILD_TABLE_FILE)) { > + fw_cfg_update_mr(s, FW_CFG_FILE_FIRST + i, s->table_mr_size)= ; > + } else if (!strcmp(s->files->f[i].name, ACPI_BUILD_LOADER_FILE))= { > + fw_cfg_update_mr(s, FW_CFG_FILE_FIRST + i, s->linker_mr_size= ); > + } else if (!strcmp(s->files->f[i].name, ACPI_BUILD_RSDP_FILE)) { > + fw_cfg_update_mr(s, FW_CFG_FILE_FIRST + i, s->rsdp_mr_size); > + } > + } > + > + return 0; > +} > + > static const VMStateDescription vmstate_fw_cfg_dma =3D { > .name =3D "fw_cfg/dma", > .needed =3D fw_cfg_dma_enabled, > @@ -619,6 +664,20 @@ static const VMStateDescription vmstate_fw_cfg_dma = =3D { > }, > }; > =20 > +static const VMStateDescription vmstate_fw_cfg_acpi_mr =3D { > + .name =3D "fw_cfg/acpi_mr", > + .version_id =3D 1, > + .minimum_version_id =3D 1, > + .needed =3D fw_cfg_acpi_mr_restore, > + .post_load =3D fw_cfg_acpi_mr_restore_post_load, > + .fields =3D (VMStateField[]) { > + VMSTATE_UINT64(table_mr_size, FWCfgState), > + VMSTATE_UINT64(linker_mr_size, FWCfgState), > + VMSTATE_UINT64(rsdp_mr_size, FWCfgState), > + VMSTATE_END_OF_LIST() > + }, > +}; > + > static const VMStateDescription vmstate_fw_cfg =3D { > .name =3D "fw_cfg", > .version_id =3D 2, > @@ -631,6 +690,7 @@ static const VMStateDescription vmstate_fw_cfg =3D { > }, > .subsections =3D (const VMStateDescription*[]) { > &vmstate_fw_cfg_dma, > + &vmstate_fw_cfg_acpi_mr, > NULL, > } > }; > @@ -815,6 +875,23 @@ static struct { > #define FW_CFG_ORDER_OVERRIDE_LAST 200 > }; > =20 > +/* > + * Any sub-page size update to these table MRs will be lost during migra= tion, > + * as we use aligned size in ram_load_precopy() -> qemu_ram_resize() pat= h. > + * In order to avoid the inconsistency in sizes save them seperately and > + * migrate over in vmstate post_load(). > + */ > +static void fw_cfg_acpi_mr_save(FWCfgState *s, const char *filename, siz= e_t len) > +{ > + if (!strcmp(filename, ACPI_BUILD_TABLE_FILE)) { > + s->table_mr_size =3D len; > + } else if (!strcmp(filename, ACPI_BUILD_LOADER_FILE)) { > + s->linker_mr_size =3D len; > + } else if (!strcmp(filename, ACPI_BUILD_RSDP_FILE)) { > + s->rsdp_mr_size =3D len; > + } > +} > + > static int get_fw_cfg_order(FWCfgState *s, const char *name) > { > int i; > @@ -914,6 +991,7 @@ void fw_cfg_add_file_callback(FWCfgState *s, const c= har *filename, > trace_fw_cfg_add_file(s, index, s->files->f[index].name, len); > =20 > s->files->count =3D cpu_to_be32(count+1); > + fw_cfg_acpi_mr_save(s, filename, len); > } > =20 > void fw_cfg_add_file(FWCfgState *s, const char *filename, > @@ -937,6 +1015,7 @@ void *fw_cfg_modify_file(FWCfgState *s, const char *= filename, > ptr =3D fw_cfg_modify_bytes_read(s, FW_CFG_FILE_FIRST + i, > data, len); > s->files->f[i].size =3D cpu_to_be32(len); > + fw_cfg_acpi_mr_save(s, filename, len); > return ptr; > } > } > @@ -973,7 +1052,10 @@ static void fw_cfg_machine_ready(struct Notifier *n= , void *data) > qemu_register_reset(fw_cfg_machine_reset, s); > } > =20 > - > +static Property fw_cfg_properties[] =3D { > + DEFINE_PROP_BOOL("acpi-mr-restore", FWCfgState, acpi_mr_restore, tru= e), > + DEFINE_PROP_END_OF_LIST(), > +}; > =20 > static void fw_cfg_common_realize(DeviceState *dev, Error **errp) > { > @@ -1097,6 +1179,8 @@ static void fw_cfg_class_init(ObjectClass *klass, v= oid *data) > =20 > dc->reset =3D fw_cfg_reset; > dc->vmsd =3D &vmstate_fw_cfg; > + > + device_class_set_props(dc, fw_cfg_properties); > } > =20 > static const TypeInfo fw_cfg_info =3D { > diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h > index b5291eefad..457fee7425 100644 > --- a/include/hw/nvram/fw_cfg.h > +++ b/include/hw/nvram/fw_cfg.h > @@ -53,6 +53,12 @@ struct FWCfgState { > dma_addr_t dma_addr; > AddressSpace *dma_as; > MemoryRegion dma_iomem; > + > + /* restore during migration */ > + bool acpi_mr_restore; > + size_t table_mr_size; > + size_t linker_mr_size; > + size_t rsdp_mr_size; > }; > =20 > struct FWCfgIoState { > --=20 > 2.17.1 >=20