SeaBIOS November 2018

seabios@seabios.org

15 participants
38 discussions

[PATCH] optionrom: disallow int19 redirect for pnp roms.
by Gerd Hoffmann 14 May '19

14 May '19

Check whenever pnp roms attempt to redirect int19, and in case it does log a message and undo the redirect. A pnp rom should not need this, we have BEVs and BCVs for that. Nevertheless there are roms in the wild which are redirecting int19. At least some BIOS implementations for physical hardware have a config option in the setup to allow/disallow int19 redirections, so just not allowing this seems to be the way to deal with this situation. Buglink: https://bugzilla.redhat.com//show_bug.cgi?id=1642135 Signed-off-by: Gerd Hoffmann <kraxel(a)redhat.com> --- src/optionroms.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/src/optionroms.c b/src/optionroms.c index fc992f649f..4ec5504ca9 100644 --- a/src/optionroms.c +++ b/src/optionroms.c @@ -8,6 +8,7 @@ #include "bregs.h" // struct bregs #include "config.h" // CONFIG_* #include "farptr.h" // FLATPTR_TO_SEG +#include "biosvar.h" // GET_IVT #include "hw/pci.h" // pci_config_readl #include "hw/pcidevice.h" // foreachpci #include "hw/pci_ids.h" // PCI_CLASS_DISPLAY_VGA @@ -136,9 +137,24 @@ init_optionrom(struct rom_header *rom, u16 bdf, int isvga) tpm_option_rom(newrom, rom->size * 512); - if (isvga || get_pnp_rom(newrom)) + struct pnp_data *pnp = get_pnp_rom(newrom); + if (isvga || pnp) { + struct segoff_s old19, new19; // Only init vga and PnP roms here. + old19 = GET_IVT(0x19); callrom(newrom, bdf); + new19 = GET_IVT(0x19); + if (old19.seg != new19.seg || + old19.offset != new19.offset) { + dprintf(1, "WARNING! rom tried to hijack int19 " + "(vec %04x:%04x, pnp %s, bev %s, bvc %s)\n", + new19.seg, new19.offset, + pnp ? "yes" : "no", + pnp && pnp->bev ? "yes" : "no", + pnp && pnp->bcv ? "yes" : "no"); + SET_IVT(0x19, old19); + } + } return rom_confirm(newrom->size * 512); } -- 2.9.3

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Re: [SeaBIOS] [coreboot] Upgrade the 12 years old LZMA libraries - should we do it?
by Carl-Daniel Hailfinger 28 Jan '19

28 Jan '19

Hi Ivan, On 03.04.2018 20:03, Ivan Ivanov wrote: > I have noticed that both coreboot and seabios are using the very old > versions of LZMA SDK. True. I introduced the lzma code in coreboot (back when it was called LinuxBIOS) when we were working on OLPC XO-1 support. > If we will upgrade our LZMA libraries from the > outdated-by-12-years 4.42 to the current version 18.04 , speed and > compression ratio should improve and maybe a few bugs will be fixed. Do you have any numbers for this? An improved compression ratio and improved speed would be nice indeed, but how does the size of the decompression code change? If the decompression code grows more than the size reduction from better compression, it would be a net loss. A significantly reduced decompression speed would also be a problem. Decompression speed would have to be measured both for stream decompression (i.e. the decompressor gets the compressed data in single-byte or multibyte chunks) as well as full-size decompression (i.e. the decompressor can access all compressed data at once). We also have to make sure that stream decompression still works after the change. > Do you think it should be done, or you are OK with using such an > outdated version? A size benefit for the resulting image is a good reason to switch. Regards, Carl-Daniel

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Re: [SeaBIOS] [PATCH] ramdisk: search for all available floppy images instead of one
by Kevin O'Connor 06 Dec '18

06 Dec '18

On Sat, Nov 24, 2018 at 11:46:53PM +0300, Mike Banon wrote: > Dear Kevin, > > Please could you tell me, why the memory allocation functions like > malloc_tmphigh() are failing at do_boot() stage? (boot.c) . Because of > this "VARVERIFY32INIT" problem described in my letter above - > https://mail.coreboot.org/pipermail/seabios/2018-November/012575.html > - I rewrote all my code to allocate the RAM for one floppy only (space > equal to max floppy size, which could be used by any selected floppy) > . But when I'm trying to boot that selected floppy - it is failing, > because these floppies are LZMA compressed inside CBFS and to > decompress them another malloc_tmphigh() is needed (from > cbfs_copyfile() / coreboot.c) / Although this code compiles fine (no > VARVERIFY32INIT problem) - this malloc_tmphigh() function is always > failing and SeaBIOS is freezing. > > Spent all my weekend debugging this problem and really stuck, any help > will be highly appreciated Hi, Only the "post" stage is able to allocate ram. Once the "boot" phase starts executing, areas of memory are locked down, and it's possible for 3rd party software to become resident in various areas of ram. SeaBIOS thus can't touch those areas of ram or modify the e820 map. The VARVERIFY32INIT flag is there to catch this type of common error. There's some info on this in the docs at: https://www.seabios.org/Memory_Model#Memory_available_during_initialization and: https://www.seabios.org/Execution_and_code_flow So, any type of allocation would have to occur before the boot stage. It should be possible (though not necessarily easy) to perform the allocation in the map_floppy_drive() phase of the code. -Kevin

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Re: [SeaBIOS] [PATCH v2] qemu: fast boot when linuxboot optionrom is used
by Kevin O'Connor 05 Dec '18

05 Dec '18

On Fri, Nov 30, 2018 at 03:27:21PM +0100, Stefano Garzarella wrote: > On Fri, Nov 30, 2018 at 2:06 PM Gerd Hoffmann <kraxel(a)redhat.com> wrote: > > > > Note: All these tests are done with CONFIG_DEBUG_LEVEL=0, using > > > > CONFIG_DEBUG_LEVEL=1 the boot time grows up to 24 ms, maybe we should > > > > put CONFIG_DEBUG_LEVEL=0 in the SeaBIOS configuration used in QEMU. > > > > > > I think the main seabios binary should have CONFIG_DEBUG_LEVEL=1 as it > > > helps with debug reports. I suppose an additional binary could be > > > made for those looking for the fastest possible speed. (The sole cost > > > of the debugging is the additional hardware accesses that results from > > > those debug messages.) > > > > The qemu debugcon (CONFIG_DEBUG_IO) is detecable at runtime, it returns > > 0xe9 on port reads. So we should be able to skip that too. IIRC it > > isn't *that* straightforward as seabios is initially mapped read/only so > > a simple probe-on-first-putchar, then cache the result in a variable > > doesn't work. We could probe after make_bios_writable though which > > should still avoid printing most of the messages. > > Great! I just tried the patch below and it works as you said. If I > don't have debugcon in QEMU the outs are avoided and the speed is not > bad (11.4 ms). > If I have debugcon (iobase=0x402), I can see the output. > > Do you think can be an acceptable trade-off? Makes sense to me. > index 0770c47..31c080e 100644 > --- a/src/fw/paravirt.c > +++ b/src/fw/paravirt.c > @@ -121,6 +121,10 @@ qemu_preinit(void) > kvm_detect(); > } > > + // Detect qemu debugcon > + if (inb(GET_GLOBAL(DebugOutputPort)) != QEMU_DEBUGCON_READBACK) > + DebugOutputPort = 0; As a minor quibble, this needs to be "if (CONFIG_DEBUG_IO && ...)" to ensure it gets compiled out if debug io is not in use. Also, I think it would be preferable to introduce a serial_debug_postram_preinit() method in src/hw/serialio.c that does this check. > --- a/src/hw/serialio.c > +++ b/src/hw/serialio.c > @@ -107,7 +107,7 @@ u16 DebugOutputPort VARFSEG = 0x402; > void > qemu_debug_putc(char c) > { > - if (CONFIG_DEBUG_IO && runningOnQEMU()) > + if (CONFIG_DEBUG_IO && runningOnQEMU() && GET_GLOBAL(DebugOutputPort)) > // Send character to debug port. > outb(c, GET_GLOBAL(DebugOutputPort)); > } As a minor nit, it would be preferable to invoke GET_GLOBAL(DebugOutputPort) only once in the success case. -Kevin

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RFC: Add support for virt machine to Seabios
by Rob Bradford 05 Dec '18

05 Dec '18

The virt machine in the NEMU project has the ambition to be a platform that has no emulated legacy hardware. This patch series enables support for that machine type in Seabios. The impact that this has for a Seabios port is that the CMOS is not available to query details of CPUs or memory configuration; instead this patch series modifies the code that queries those details to prefer those from QEMU FW CFG over CMOS. I've tested this patch series with pc, Q35 and virt as part of our automated testing for NEMU. Rob

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[PATCH] Revert "mptable: Don't describe pci-to-pci bridges."
by Liran Alon 03 Dec '18

03 Dec '18

From: Arbel Moshe <arbel.moshe(a)oracle.com> This reverts commit 3c3a3fa6522f ("mptable: Don't describe pci-to-pci bridges.”) The reverted commit removed the description of non-root PCI busses from the MPTable in claim they are not necessary. However, it seems that some guests rely on this information in order to correclty configure IOAPIC redirection-table entries for interrupts originated from PCI devices on non-root PCI busses. One such guest is "Extreme Networks OS". We observed that if this guest is setup with an E1000 NIC behind a PCI bridge, the OS wouldn't configure the IOAPIC redirection-table entry for the IRQ that the E1000 PIN is connected to. Therefore, interrupts from the NIC were not delivered to OS which caused guest to not have network connectivity. Fixes: 3c3a3fa6522f ("mptable: Don't describe pci-to-pci bridges.”) Reviewed-by: Liran Alon <liran.alon(a)oracle.com> Reviewed-by: Mark Kanda <mark.kanda(a)oracle.com> Signed-off-by: Arbel Moshe <arbel.moshe(a)oracle.com> --- src/fw/mptable.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/src/fw/mptable.c b/src/fw/mptable.c index 47385cc5d32d..27686369e98c 100644 --- a/src/fw/mptable.c +++ b/src/fw/mptable.c @@ -72,25 +72,30 @@ mptable_setup(void) } int entrycount = cpu - cpus; - // PCI bus + // PCI buses struct mpt_bus *buses = (void*)cpu, *bus = buses; - if (!hlist_empty(&PCIDevices)) { + int lastbus = -1; + struct pci_device *pci; + foreachpci(pci) { + int curbus = pci_bdf_to_bus(pci->bdf); + if (curbus == lastbus) + continue; + lastbus = curbus; memset(bus, 0, sizeof(*bus)); bus->type = MPT_TYPE_BUS; - bus->busid = 0; + bus->busid = curbus; memcpy(bus->bustype, "PCI ", sizeof(bus->bustype)); bus++; - entrycount++; } /* isa bus */ - int isabusid = bus - buses; + int isabusid; memset(bus, 0, sizeof(*bus)); bus->type = MPT_TYPE_BUS; - bus->busid = isabusid; + isabusid = bus->busid = lastbus + 1; memcpy(bus->bustype, "ISA ", sizeof(bus->bustype)); bus++; - entrycount++; + entrycount += bus - buses; /* ioapic */ u8 ioapic_id = BUILD_IOAPIC_ID; @@ -108,11 +113,8 @@ mptable_setup(void) int dev = -1; unsigned short pinmask = 0; - struct pci_device *pci; foreachpci(pci) { u16 bdf = pci->bdf; - if (pci_bdf_to_bus(bdf) != 0) - break; int pin = pci_config_readb(bdf, PCI_INTERRUPT_PIN); int irq = pci_config_readb(bdf, PCI_INTERRUPT_LINE); if (pin == 0) -- 2.16.1

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[PATCH] mpt-scsi: Align MPT request to 8 bytes
by Liran Alon 02 Dec '18

02 Dec '18

From: Nikita Leshchenko <nikita.leshchenko(a)oracle.com> When mpt-scsi receives a SCSI message, it wraps it in a MPT request message and writes it's address to an IO port to be added to the request queue. This MPT request is allocated on the stack. Previous to this commit, the request is aligned to 4 bytes. However, VirtualBox LSI53c1030 device emulation aligns the request address to 8 bytes. Therefore, this commit change alignment of request to 8 bytes. VirtualBox source code which handles this is at Devices/Storage/DevLsiLogicSCSI.cpp. lsilogicRegisterWrite() LSILOGIC_REG_REQUEST_QUEUE handler adds the request to the queue (pRequestQueueBase). lsilogicR3Worker() reads request from pRequestQueueBase and aligns it to 8 bytes (u32RequestMessageFrameDesc & ~0x07). Reviewed-by: Liran Alon <liran.alon(a)oracle.com> Reviewed-by: Mark Kanda <mark.kanda(a)oracle.com> Signed-off-by: Nikita Leshchenko <nikita.leshchenko(a)oracle.com> --- src/hw/mpt-scsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/hw/mpt-scsi.c b/src/hw/mpt-scsi.c index 1faede6aec6f..9966ca28054f 100644 --- a/src/hw/mpt-scsi.c +++ b/src/hw/mpt-scsi.c @@ -124,7 +124,7 @@ mpt_scsi_cmd(u32 iobase, struct disk_op_s *op, struct scsi_req { MptSCSIIORequest_t scsi_io; MptSGEntrySimple32_t sge; - } __attribute__((packed, aligned(4))) req = { + } __attribute__((packed, aligned(8))) req = { .scsi_io = { .TargetID = target, .Bus = 0, -- 2.16.1

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Re: [SeaBIOS] [PATCH v2] qemu: fast boot when linuxboot optionrom is used
by Kevin O'Connor 30 Nov '18

30 Nov '18

On Thu, Nov 29, 2018 at 03:16:39PM +0100, Stefano Garzarella wrote: > On Wed, Nov 28, 2018 at 3:38 PM Kevin O'Connor <kevin(a)koconnor.net> wrote: > > It would be good to understand what the source of the delay is. It > > might be possible to avoid the delay without adding a new config > > setting. For example, the patch above will prevent the vga rom from > > being run, but it should be possible to accomplish the same with > > "-device VGA,romfile=". The other change this patch makes is to skip > > device_hardware_setup() - is it known which items in that function add > > to the delay? > > Hi Kevin, > thanks for your advice. > > I tried to understand what are the sources of the delay, and I found > that most of the time is spent because of QEMU default devices (eg > e1000 ROM PCI, mouse, keyboard, etc) > At this point, (without the patch above) I disabled the default QEMU > devices (-nodefaults) and I reached 12.5 ms of SeaBIOS boot time > (compared to 22 ms, where 4 ms is taken by the loading of e1000 ROM). > > Other 2 ms is taken by enable_vga_console(), where simply comment out > the printf("SeaBIOS (version %s)\n", VERSION) I reached 10.7 ms of > boot time. > Do you think is acceptable to use dprintf(1, ...) instead of printf()? > Or maybe check if we found the VGA. Interesting. I tracked down this printf delay - it's due to the save/restore of cpu state when thunking to 16bit mode. (For every character displayed on the screen the code enters 16bit mode to invoke the vgabios and it saves/restores the cr0, gdt, fs, gs, a20, nmi states during that process.) It's trivial to eliminate the calls when there is no vgabios though (see patch below). > Note: All these tests are done with CONFIG_DEBUG_LEVEL=0, using > CONFIG_DEBUG_LEVEL=1 the boot time grows up to 24 ms, maybe we should > put CONFIG_DEBUG_LEVEL=0 in the SeaBIOS configuration used in QEMU. I think the main seabios binary should have CONFIG_DEBUG_LEVEL=1 as it helps with debug reports. I suppose an additional binary could be made for those looking for the fastest possible speed. (The sole cost of the debugging is the additional hardware accesses that results from those debug messages.) > > Also, what is the target boot time that is considered acceptable? > > I'm using qboot as a reference (6/7 ms). It is very minimal, so 10 ms > I think is considered acceptable for SeaBIOS Thanks, -Kevin --- a/src/output.c +++ b/src/output.c @@ -74,6 +74,9 @@ static struct putcinfo debuginfo = { debug_putc }; static void screenc(char c) { + if (!MODESEGMENT && GET_IVT(0x10).segoff == FUNC16(entry_10).segoff) + // No need to thunk to 16bit mode if vgabios is not present + return; struct bregs br; memset(&br, 0, sizeof(br)); br.flags = F_IF;

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Re: [SeaBIOS] [PATCH v2] qemu: fast boot when linuxboot optionrom is used
by Kevin O'Connor 29 Nov '18

29 Nov '18

On Wed, Nov 28, 2018 at 12:30:42PM +0100, Stefano Garzarella wrote: > On Wed, Nov 28, 2018 at 3:12 AM Kevin O'Connor <kevin(a)koconnor.net> wrote: > > On Mon, Nov 26, 2018 at 12:39:12PM +0100, Stefano Garzarella wrote: > > > Speed up the boot phase when qemu uses "linuxboot" optionrom > > > (qemu -kernel) and the boot-menu is not required. > > > Under these conditions we can skip the setup of devices and VGA, > > > because they will be initialized (if they are required) during > > > the Linux boot phase. > > > > > > Following the time measured between SeaBIOS entry point and > > > "linuxboot" entry point: > > > > > > * Before this patch > > > qemu -kernel | qemu -vga none -kernel > > > --------------+----------------------- > > > 53.5 msec | 23.34 msec > > > > > > * After this patch > > > qemu -kernel | qemu -vga none -kernel > > > --------------+----------------------- > > > 12.82 msec | 10.89 msec > > > > > > Note: For the measuring, we used the default configuration disabling > > > debug messages (CONFIG_DEBUG_LEVEL=0) and applying Stephen's patch: > > > "tpm: Check for TPM related ACPI tables before attempting hw" > > > > > > Signed-off-by: Stefano Garzarella <sgarzare(a)redhat.com> > > > --- > > > src/bootsplash.c | 3 +++ > > > src/fw/paravirt.c | 10 ++++++++++ > > > src/fw/paravirt.h | 4 ++++ > > > src/optionroms.c | 3 ++- > > > src/post.c | 3 +++ > > > 5 files changed, 22 insertions(+), 1 deletion(-) > > > > > > diff --git a/src/bootsplash.c b/src/bootsplash.c > > > index 165c98d..0eda7f2 100644 > > > --- a/src/bootsplash.c > > > +++ b/src/bootsplash.c > > > @@ -8,6 +8,7 @@ > > > #include "bregs.h" // struct bregs > > > #include "config.h" // CONFIG_* > > > #include "farptr.h" // FLATPTR_TO_SEG > > > +#include "fw/paravirt.h" // runningOnQEMUFastBoot > > > #include "malloc.h" // free > > > #include "output.h" // dprintf > > > #include "romfile.h" // romfile_loadfile > > > @@ -39,6 +40,8 @@ call16_int10(struct bregs *br) > > > void > > > enable_vga_console(void) > > > { > > > + if(runningOnQEMUFastBoot()) > > > + return; > > > dprintf(1, "Turning on vga text mode console\n"); > > > struct bregs br; > > > > > > diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c > > > index 0770c47..9e6e618 100644 > > > --- a/src/fw/paravirt.c > > > +++ b/src/fw/paravirt.c > > > @@ -621,4 +621,14 @@ void qemu_cfg_init(void) > > > if (nogfx && !romfile_find("etc/sercon-port") > > > && !romfile_find("vgaroms/sgabios.bin")) > > > const_romfile_add_int("etc/sercon-port", PORT_SERIAL1); > > > + > > > + /* > > > + * Enable QEMU fast boot if there is "linuxboot" optionrom and > > > + * the boot menu is not required. > > > + */ > > > + if ((romfile_find("genroms/linuxboot_dma.bin") > > > + || romfile_find("genroms/linuxboot.bin")) > > > + && !romfile_loadint("etc/show-boot-menu", 1)) { > > > + PlatformRunningOn |= PF_QEMU_FB; > > > + } > > > > I don't think we should hardcode special meanings to the names of > > bootable files. If QEMU wants SeaBIOS to not perform some type of > > hardware init, then I think QEMU should explicitly request that from > > SeaBIOS (eg, a "etc/dont-run-hardware-init"). > > I agree, it is cleaner. That was one of my doubt but, with an explicit > request, it works only with a new version of QEMU. > Do you think is acceptable? It would be good to understand what the source of the delay is. It might be possible to avoid the delay without adding a new config setting. For example, the patch above will prevent the vga rom from being run, but it should be possible to accomplish the same with "-device VGA,romfile=". The other change this patch makes is to skip device_hardware_setup() - is it known which items in that function add to the delay? Also, what is the target boot time that is considered acceptable? Thanks, -Kevin

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[PATCH] SMBIOS: Add SMBIOS Type 6 Memory Module Information
by Liran Alon 28 Nov '18

28 Nov '18

From: Arbel Moshe <arbel.moshe(a)oracle.com> Add support for obsolete SMBIOS Type 6 which describes the speed, type, size and error status of each system memory module. This is required by some guests to boot successfully. Such an example is Cisco NGFW appliance which has a script which runs every boot that parses this SMBIOS Type 6 information and if it doesn't exists, it just fails to boot with an error of "Unable to parse dmidecode. Restarting now!". Reviewed-by: Liran Alon <liran.alon(a)oracle.com> Reviewed-by: Ross Philipson <ross.philipson(a)oracle.com> Signed-off-by: Arbel Moshe <arbel.moshe(a)oracle.com> --- src/fw/smbios.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ src/std/smbios.h | 12 ++++++++++++ 2 files changed, 58 insertions(+) diff --git a/src/fw/smbios.c b/src/fw/smbios.c index f3b5ad9dd9a0..751ae98f0fc4 100644 --- a/src/fw/smbios.c +++ b/src/fw/smbios.c @@ -348,6 +348,51 @@ smbios_init_type_4(void *start, unsigned int cpu_number) return end; } +/* Type 6 -- Memory Module Information */ +static void * +smbios_init_type_6(void *start, u32 size_mb, int instance) +{ + struct smbios_type_6 *p = (struct smbios_type_6 *)start; + char *end = (char *)start + sizeof(struct smbios_type_6); + u8 size_mem = 0; + char name[1024]; + int str_index = 0; + + p->header.type = 6; + p->header.length = sizeof(struct smbios_type_6); + p->header.handle = 0x600 + instance; + + snprintf(name, sizeof(name), "RAM socket #%2x", instance); + + memcpy(end, name, strlen(name) + 1); + end += strlen(name) + 1; + p->socket_designation_str = ++str_index; + + set_field_with_default(6, bank_connection, 0xff); /* No connection */ + set_field_with_default(6, current_speed, 0); /* Unknown Speed */ + set_field_with_default(6, memory_type, 0x400); /* SDRAM */ + + /* size_mem = n, where 2**n = size_mb */ + size_mb = size_mb >> 1; + while (size_mb) { + ++size_mem; + size_mb = size_mb >> 1; + } + + p->installed_size = size_mem; + p->enabled_size = size_mem; + set_field_with_default(6, error_status, 0); + + *end = 0; + end++; + if (!str_index) { + *end = 0; + end++; + } + + return end; +} + /* Type 16 -- Physical Memory Array */ static void * smbios_init_type_16(void *start, u32 memory_size_mb, int nr_mem_devs) @@ -550,6 +595,7 @@ smbios_legacy_setup(void) u32 dev_mb = ((i == (nr_mem_devs - 1)) ? (((ram_mb - 1) & 0x3fff) + 1) : 16384); + add_struct(6, p, dev_mb, i); add_struct(17, p, dev_mb, i); } diff --git a/src/std/smbios.h b/src/std/smbios.h index 4ccf2ea348ee..765ac51667ed 100644 --- a/src/std/smbios.h +++ b/src/std/smbios.h @@ -100,6 +100,18 @@ struct smbios_type_4 { u16 l3_cache_handle; } PACKED; +/* SMBIOS type 6 - Memory Module Information */ +struct smbios_type_6 { + struct smbios_structure_header header; + u8 socket_designation_str; + u8 bank_connection; + u8 current_speed; + u16 memory_type; + u8 installed_size; + u8 enabled_size; + u8 error_status; +} PACKED; + /* SMBIOS type 16 - Physical Memory Array * Associated with one type 17 (Memory Device). */ -- 2.16.1

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SeaBIOS November 2018