5bb55f3e3b
tl;dr: This allows Big Endian zImage booting via -kernel + x-vof=on. QEMU loads the kernel at 0x400000 by default which works most of the time as Linux kernels are relocatable, 64bit and compiled with "-pie" (position independent code). This works for a little endian zImage too. However a big endian zImage is compiled without -pie, is 32bit, linked to 0x4000000 so current QEMU ends up loading it at 0x4400000 but keeps spapr->kernel_addr unchanged so booting fails. This uses the kernel address returned from load_elf(). If the default kernel_addr is used, there is no change in behavior (as translate_kernel_address() takes care of this), which is: LE/BE vmlinux and LE zImage boot, BE zImage does not. If the VM created with "-machine kernel-addr=0,x-vof=on", then QEMU prints a warning and BE zImage boots. Note #1: SLOF (x-vof=off) still cannot boot a big endian zImage as SLOF enables MSR_SF for everything loaded by QEMU and this leads to early crash of 32bit zImage. Note #2: BE/LE vmlinux images set MSR_SF in early boot so these just work; a LE zImage restores MSR_SF after every CI call and we are lucky enough not to crash before the first CI call. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Tested-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com> Message-Id: <20220504065536.3534488-1-aik@ozlabs.ru> [danielhb: use PRIx64 instead of lx in warn_report] Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> |
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| .. | ||
| e500-ccsr.h | ||
| e500.c | ||
| e500.h | ||
| e500plat.c | ||
| fdt.c | ||
| fw_cfg.c | ||
| Kconfig | ||
| mac.h | ||
| mac_newworld.c | ||
| mac_oldworld.c | ||
| meson.build | ||
| mpc8544_guts.c | ||
| mpc8544ds.c | ||
| pef.c | ||
| pegasos2.c | ||
| pnv.c | ||
| pnv_bmc.c | ||
| pnv_core.c | ||
| pnv_homer.c | ||
| pnv_lpc.c | ||
| pnv_occ.c | ||
| pnv_pnor.c | ||
| pnv_psi.c | ||
| pnv_xscom.c | ||
| ppc.c | ||
| ppc4xx_devs.c | ||
| ppc4xx_pci.c | ||
| ppc405.h | ||
| ppc405_boards.c | ||
| ppc405_uc.c | ||
| ppc440.h | ||
| ppc440_bamboo.c | ||
| ppc440_pcix.c | ||
| ppc440_uc.c | ||
| ppc_booke.c | ||
| ppce500_spin.c | ||
| prep.c | ||
| prep_systemio.c | ||
| rs6000_mc.c | ||
| sam460ex.c | ||
| spapr.c | ||
| spapr_caps.c | ||
| spapr_cpu_core.c | ||
| spapr_drc.c | ||
| spapr_events.c | ||
| spapr_hcall.c | ||
| spapr_iommu.c | ||
| spapr_irq.c | ||
| spapr_numa.c | ||
| spapr_nvdimm.c | ||
| spapr_ovec.c | ||
| spapr_pci.c | ||
| spapr_pci_nvlink2.c | ||
| spapr_pci_vfio.c | ||
| spapr_rng.c | ||
| spapr_rtas.c | ||
| spapr_rtas_ddw.c | ||
| spapr_rtc.c | ||
| spapr_softmmu.c | ||
| spapr_tpm_proxy.c | ||
| spapr_vio.c | ||
| spapr_vof.c | ||
| trace-events | ||
| trace.h | ||
| virtex_ml507.c | ||
| vof.c | ||