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Wed, 16 Sep 2020 09:56:36 +0000 (UTC) Date: Wed, 16 Sep 2020 10:56:33 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Laszlo Ersek Subject: Re: PATCH: Increase System Firmware Max Size Message-ID: <20200916095633.GJ1535709@redhat.com> References: MIME-Version: 1.0 In-Reply-To: User-Agent: Mutt/1.14.6 (2020-07-11) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Received-SPF: pass client-ip=205.139.110.61; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/16 00:53:39 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.999, 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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: "mst@redhat.com" , "qemu-trivial@nongnu.org" , "Dr. David Alan Gilbert" , "qemu-devel@nongnu.org" , "McMillan, Erich" , Igor Mammedov Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, Sep 16, 2020 at 11:52:41AM +0200, Laszlo Ersek wrote: > Hi Erich, > > (1) this patch is really not trivial; please do not continue CC'ing > qemu-trivial > > (2) Please do CC people that have given you feedback previously. I > primarily mean Daniel and David. > > (3) Generally speaking, please post new versions of a patch stand-alone > (not in reply to another message) on the list. > > (4) Please use git-send-email (or suitable wrapper utilities) for > sending your patch. > > https://wiki.qemu.org/Contribute/SubmitAPatch > > > One non-meta comment below: > > On 09/15/20 21:10, McMillan, Erich via wrote: > > Apologies, ignore previous patch. The relevant patch is below: > > > > From 473daf6129debf8d158a9ae1aff788c5bdbbc799 Mon Sep 17 00:00:00 2001 > > From: Erich McMillan > > Date: Tue, 15 Sep 2020 13:23:25 -0500 > > Subject: [PATCH 2/2] Add max firmware size as optional parameter > > > > Signed-off-by: Erich McMillan > > --- > > hw/i386/pc_sysfw.c | 13 ++----------- > > include/hw/loader.h | 9 +++++++++ > > qemu-options.hx | 8 ++++++++ > > softmmu/vl.c | 40 ++++++++++++++++++++++++++++++++++++++++ > > 4 files changed, 59 insertions(+), 11 deletions(-) > > > > diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c > > index b6c0822..ba6c99d 100644 > > --- a/hw/i386/pc_sysfw.c > > +++ b/hw/i386/pc_sysfw.c > > @@ -39,15 +39,6 @@ > > #include "hw/block/flash.h" > > #include "sysemu/kvm.h" > > > > -/* > > - * We don't have a theoretically justifiable exact lower bound on the base > > - * address of any flash mapping. In practice, the IO-APIC MMIO range is > > - * [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free > > - * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in > > - * size. > > - */ > > -#define FLASH_SIZE_LIMIT (8 * MiB) > > - > > #define FLASH_SECTOR_SIZE 4096 > > > > static void pc_isa_bios_init(MemoryRegion *rom_memory, > > @@ -182,10 +173,10 @@ static void pc_system_flash_map(PCMachineState *pcms, > > } > > if ((hwaddr)size != size > > || total_size > HWADDR_MAX - size > > - || total_size + size > FLASH_SIZE_LIMIT) { > > + || total_size + size > MaxCombinedFirmwareSize) { > > error_report("combined size of system firmware exceeds " > > "%" PRIu64 " bytes", > > - FLASH_SIZE_LIMIT); > > + MaxCombinedFirmwareSize); > > exit(1); > > } > > > > diff --git a/include/hw/loader.h b/include/hw/loader.h > > index a9eeea3..7898b63 100644 > > --- a/include/hw/loader.h > > +++ b/include/hw/loader.h > > @@ -318,4 +318,13 @@ int rom_add_option(const char *file, int32_t bootindex); > > * overflow on real hardware too. */ > > #define UBOOT_MAX_GUNZIP_BYTES (64 << 20) > > > > +/* > > + * We don't have a theoretically justifiable exact lower bound on the base > > + * address of any flash mapping. In practice, the IO-APIC MMIO range is > > + * [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free > > + * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in > > + * size, but allow user to specify larger size via command line. > > + */ > > +extern uint64_t MaxCombinedFirmwareSize; > > + > > #endif > > diff --git a/qemu-options.hx b/qemu-options.hx > > index b0f0205..32eed3a 100644 > > --- a/qemu-options.hx > > +++ b/qemu-options.hx > > @@ -1377,6 +1377,14 @@ SRST > > |qemu_system_x86| -hda a -hdb b > > ERST > > > > +DEF("maxfirmwaresize", HAS_ARG, QEMU_OPTION_maxfirmwaresize, > > + "-maxfirmwaresize [size=]megs specify maximum combined firmware size, default is 8MiB. Known issues if value exceeds 16MiB.\n", > > + QEMU_ARCH_ALL) > > +SRST > > +``-maxfirmwaresize [size=]megs`` > > + Specify maximum combined firmware size, default is 8MiB. Known issues if value exceeds 16MiB. > > +ERST > > + > > DEF("mtdblock", HAS_ARG, QEMU_OPTION_mtdblock, > > "-mtdblock file use 'file' as on-board Flash memory image\n", > > QEMU_ARCH_ALL) > > diff --git a/softmmu/vl.c b/softmmu/vl.c > > index 0cc86b0..fcf41d2 100644 > > --- a/softmmu/vl.c > > +++ b/softmmu/vl.c > > @@ -116,6 +116,8 @@ > > > > #define MAX_VIRTIO_CONSOLES 1 > > > > +uint64_t MaxCombinedFirmwareSize = 8 * MiB; > > + > > static const char *data_dir[16]; > > static int data_dir_idx; > > const char *bios_name = NULL; > > @@ -448,6 +450,20 @@ static QemuOptsList qemu_mem_opts = { > > }, > > }; > > > > +static QemuOptsList qemu_max_fw_size_opts = { > > + .name = "maxfirmwaresize", > > + .implied_opt_name = "size", > > + .head = QTAILQ_HEAD_INITIALIZER(qemu_max_fw_size_opts.head), > > + .merge_lists = true, > > + .desc = { > > + { > > + .name = "size", > > + .type = QEMU_OPT_SIZE, > > + }, > > + { /* end of list */ } > > + }, > > +}; > > + > > static QemuOptsList qemu_icount_opts = { > > .name = "icount", > > .implied_opt_name = "shift", > > @@ -2576,6 +2592,23 @@ static bool object_create_delayed(const char *type, QemuOpts *opts) > > return !object_create_initial(type, opts); > > } > > > > +static void set_max_firmware_size(uint64_t *maxfwsize) > > +{ > > + const char *max_fw_size_str; > > + QemuOpts *opts = qemu_find_opts_singleton("maxfirmwaresize"); > > + > > + max_fw_size_str = qemu_opt_get(opts, "size"); > > + > > + if (max_fw_size_str) { > > + if (!*max_fw_size_str) { > > + error_report("missing 'size' option value"); > > + exit(EXIT_FAILURE); > > + } > > + > > + *maxfwsize = qemu_opt_get_size(opts, "size", 8 * MiB); > > + } > > +} > > + > > > > static bool set_memory_options(uint64_t *ram_slots, ram_addr_t *maxram_size, > > MachineClass *mc) > > @@ -2904,6 +2937,7 @@ void qemu_init(int argc, char **argv, char **envp) > > qemu_add_opts(&qemu_machine_opts); > > qemu_add_opts(&qemu_accel_opts); > > qemu_add_opts(&qemu_mem_opts); > > + qemu_add_opts(&qemu_max_fw_size_opts); > > qemu_add_opts(&qemu_smp_opts); > > qemu_add_opts(&qemu_boot_opts); > > qemu_add_opts(&qemu_add_fd_opts); > > @@ -3160,6 +3194,10 @@ void qemu_init(int argc, char **argv, char **envp) > > exit(EXIT_FAILURE); > > } > > break; > > + case QEMU_OPTION_maxfirmwaresize: > > + opts = qemu_opts_parse_noisily(qemu_find_opts("maxfirmwaresize"), > > + optarg, true); > > + break; > > #ifdef CONFIG_TPM > > case QEMU_OPTION_tpmdev: > > if (tpm_config_parse(qemu_find_opts("tpmdev"), optarg) < 0) { > > @@ -3845,6 +3883,8 @@ void qemu_init(int argc, char **argv, char **envp) > > have_custom_ram_size = set_memory_options(&ram_slots, &maxram_size, > > machine_class); > > > > + set_max_firmware_size(&MaxCombinedFirmwareSize); > > + > > os_daemonize(); > > rcu_disable_atfork(); > > > > (5) In my opinion (which could be wrong of course), we shouldn't > introduce a new command line option for this, but a new PC machine type > property called "x-firmware-max-size". Yeah, we definitely do not want a new top level CLI arg, just a machine type property. We don't need any "x-" prefix on it though, just a plain "firmware-max-size" prop is fine. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|