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[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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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