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optionrom: Remove build-id section Our linker script for optionroms specifies only the placement of the .text section, leaving the linker free to place the remaining sections at arbitrary places in the file. Since at least binutils 2.39, the .note.gnu.build-id section is now being placed at the start of the file, which causes label addresses to be shifted. For linuxboot_dma.bin that means that the PnP header (among others) will not be found when determining the type of ROM at optionrom_setup(): (0x1c is the label _pnph, where the magic "PnP" is) $ xxd /usr/share/qemu/linuxboot_dma.bin | grep "PnP" 00000010: 0000 0000 0000 0000 0000 1c00 2450 6e50 ............$PnP $ xxd pc-bios/optionrom/linuxboot_dma.bin | grep "PnP" 00000010: 0000 0000 0000 0000 0000 4c00 2450 6e50 ............$PnP ^bad Using a freshly built linuxboot_dma.bin ROM results in a broken boot: SeaBIOS (version rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org) Booting from Hard Disk... Boot failed: could not read the boot disk Booting from Floppy... Boot failed: could not read the boot disk No bootable device. We're not using the build-id section, so pass the --build-id=none option to the linker to remove it entirely. Note: In theory, this same issue could happen with any other section. The ideal solution would be to have all unused sections discarded in the linker script. However that would be a larger change, specially for the pvh rom which uses the .bss and COMMON sections so I'm addressing only the immediate issue here. Reported-by: Vasiliy Ulyanov <vulyanov@suse.de> Signed-off-by: Fabiano Rosas <farosas@suse.de> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-ID: <20230926192502.15986-1-farosas@suse.de> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | 2 年前 | |
optionrom: fix compilation with mingw docker target Two fixes are needed. First, mingw does not have -D_FORTIFY_SOURCE, hence --enable-debug disables optimization. This is not acceptable for ROMs, which should override CFLAGS to force inclusion of -O2. Second, PE stores global constructors and destructors using the following linker script snippet: ___CTOR_LIST__ = .; __CTOR_LIST__ = . ; LONG (-1);*(.ctors); *(.ctor); *(SORT(.ctors.*)); LONG (0); ___DTOR_LIST__ = .; __DTOR_LIST__ = . ; LONG (-1); *(.dtors); *(.dtor); *(SORT(.dtors.*)); LONG (0); The LONG directives cause the .img files to be 16 bytes too large; the recently added check to signrom.py catches this. To fix this, replace -T and -e options with a linker script. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | 9 年前 | |
kvmvapic: Use optionrom helpers Use OPTION_ROM_START/END from the common header file, add comment to init code. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com> | 14 年前 | |
linuxboot: fix loading old kernels Old kernels that used high memory only allowed the initrd to be in the first 896MB of memory. If you load the initrd above, they complain that "initrd extends beyond end of memory". In order to fix this, while not breaking machines with small amounts of memory fixed by cdebec5 (linuxboot: compute initrd loading address, 2014-10-06), we need to distinguish two cases. If pc.c placed the initrd at end of memory, use the new algorithm based on the e801 memory map. If instead pc.c placed the initrd at the maximum address specified by the bzImage, leave it there. The only interesting part is that the low-memory info block is now loaded very early, in real mode, and thus the 32-bit address has to be converted into a real mode segment. The initrd address is also patched in the info block before entering real mode, it is simpler that way. This fixes booting the RHEL4.8 32-bit installation image with 1GB of RAM. Cc: qemu-stable@nongnu.org Cc: mst@redhat.com Cc: jsnow@redhat.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | 11 年前 | |
linuxboot_dma: move common functions in a new header In order to allow other option roms to use these common useful functions and definitions, this patch put them in two new C header files called optrom.h and optrom_fw_cfg.h. We also add useful out*() in*() functions for different size, and new fw_cfg functions to use when DMA feature is not available. Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> | 7 年前 | |
optionrom: add a DMA-enabled multiboot ROM Add a new option rom for the multiboot loader, using DMA transfers to copy data instead of "rep insb". This significantly lowers QEMU's startup latency by a factor of about 40, for example, going from 30sec to 0.8sec when loading modules of 120MB in size. Signed-off-by: Marcus Hähnel <marcus.haehnel@kernkonzept.com> Signed-off-by: Adam Lackorzynski <adam@l4re.org> [Modified to keep the non-DMA code depending on #ifdef USE_FW_CFG_DMA; do not write below stack. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | 4 年前 | |
optionrom: add a DMA-enabled multiboot ROM Add a new option rom for the multiboot loader, using DMA transfers to copy data instead of "rep insb". This significantly lowers QEMU's startup latency by a factor of about 40, for example, going from 30sec to 0.8sec when loading modules of 120MB in size. Signed-off-by: Marcus Hähnel <marcus.haehnel@kernkonzept.com> Signed-off-by: Adam Lackorzynski <adam@l4re.org> [Modified to keep the non-DMA code depending on #ifdef USE_FW_CFG_DMA; do not write below stack. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | 4 年前 | |
replace TABs with spaces Bring the files in line with the QEMU coding style, with spaces for indentation. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/378 Signed-off-by: Yeqi Fu <fufuyqqqqqq@gmail.com> Message-Id: <20230315032649.57568-1-fufuyqqqqqq@gmail.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com> | 3 年前 | |
linuxboot_dma: move common functions in a new header In order to allow other option roms to use these common useful functions and definitions, this patch put them in two new C header files called optrom.h and optrom_fw_cfg.h. We also add useful out*() in*() functions for different size, and new fw_cfg functions to use when DMA feature is not available. Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> | 7 年前 | |
linuxboot_dma: move common functions in a new header In order to allow other option roms to use these common useful functions and definitions, this patch put them in two new C header files called optrom.h and optrom_fw_cfg.h. We also add useful out*() in*() functions for different size, and new fw_cfg functions to use when DMA feature is not available. Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> | 7 年前 | |
optionrom: add new PVH option rom The new pvh.bin option rom can be used with SeaBIOS to boot uncompressed kernel using the x86/HVM direct boot ABI. pvh.S contains the entry point of the option rom. It runs in real mode, loads the e820 table querying the BIOS, and then it switches to 32bit protected mode and jumps to the pvh_load_kernel() written in pvh_main.c. pvh_load_kernel() loads the cmdline and kernel entry_point using fw_cfg, then it looks for RSDP, fills the hvm_start_info required by x86/HVM ABI, and finally jumps to the kernel entry_point. Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> | 7 年前 | |
optionrom/pvh: scan entire RSDP Area Right now the PVH option rom scans for the RSDP from 0xE0000 to 0xE1FFF. This is probobly a typo, it should scan from 0xE0000 to 0xFFFFF. This is actually an issue on some QEMU versions/machines. For example, when I run QEMU the RSDP is placed at 0xf5ad0 which will not be picked up by the current implementation. This bug still allows a Linux guest to boot (in most configurations) as the kernel will just scan for the RSDP if one isn't provided. Signed-off-by: Joe Richey <joerichey@google.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Fixes: 2785dc7b17 ("optionrom: add new PVH option rom") Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> | 6 年前 |
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