Hi Michael, On 12/27/23 10:27, Michael Ellerman wrote: > Geoff Levand <ge...@infradead.org> writes: >> Commit 8c5fa3b5c4df3d071dab42b04b971df370d99354 (powerpc/64: Make ELFv2 the >> default for big-endian builds), merged in Linux-6.5-rc1 changes the calling >> ABI >> in a way that is incompatible with the current code for the PS3's LV1 >> hypervisor >> calls. > > I'll take this for now. > > But medium term we would like to switch to only using ELFv2, so it would > be good if we can work out what the actual problem is.
I've been looking into converting the LV1 hypercalls to v2. >> This change just adds the line '# CONFIG_PPC64_BIG_ENDIAN_ELF_ABI_V2 is not >> set' >> to the ps3_defconfig file so that the PPC64_ELF_ABI_V1 is used. >> >> Fixes run time errors like these: >> >> BUG: Kernel NULL pointer dereference at 0x00000000 >> Faulting instruction address: 0xc000000000047cf0 >> Oops: Kernel access of bad area, sig: 11 [#1] >> >> Call Trace: >> [c0000000023039e0] [c00000000100ebfc] ps3_create_spu+0xc4/0x2b0 >> (unreliable) >> [c000000002303ab0] [c00000000100d4c4] create_spu+0xcc/0x3c4 >> [c000000002303b40] [c00000000100eae4] ps3_enumerate_spus+0xa4/0xf8 > > That can't be the first hvcall we've done, there's one in > ps3_setup_arch(). So I guess only some hcalls are failing? I guess because ps3_create_spu has 7 input parameters and returns 6 parameters, so it hits some difference between V1 and V2 that the other LV1 calls up to that point have not hit. -Geoff
