On Tue, May 10, 2022 at 9:29 PM Tsukasa OI <[email protected]> wrote: > > Because some operating systems don't correctly parse long ISA extension > string, this commit adds short-isa-string boolean option to disable > generating long ISA extension strings on Device Tree. > > For instance, enabling Zfinx and Zdinx extensions and booting Linux (5.17 or > earlier) with FPU support caused a kernel panic. > > Operating Systems which short-isa-string might be helpful: > > 1. Linux (5.17 or earlier) > 2. FreeBSD (at least 14.0-CURRENT) > 3. OpenBSD (at least current development version) > > Signed-off-by: Tsukasa OI <[email protected]>
Acked-by: Alistair Francis <[email protected]> Alistair > --- > target/riscv/cpu.c | 5 ++++- > target/riscv/cpu.h | 2 ++ > 2 files changed, 6 insertions(+), 1 deletion(-) > > diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c > index 9f38e56316..4db3dce25a 100644 > --- a/target/riscv/cpu.c > +++ b/target/riscv/cpu.c > @@ -879,6 +879,8 @@ static Property riscv_cpu_properties[] = { > DEFINE_PROP_BOOL("x-aia", RISCVCPU, cfg.aia, false), > > DEFINE_PROP_UINT64("resetvec", RISCVCPU, cfg.resetvec, DEFAULT_RSTVEC), > + > + DEFINE_PROP_BOOL("short-isa-string", RISCVCPU, cfg.short_isa_string, > false), > DEFINE_PROP_END_OF_LIST(), > }; > > @@ -1049,7 +1051,8 @@ char *riscv_isa_string(RISCVCPU *cpu) > } > } > *p = '\0'; > - riscv_isa_string_ext(cpu, &isa_str, maxlen); > + if (!cpu->cfg.short_isa_string) > + riscv_isa_string_ext(cpu, &isa_str, maxlen); > return isa_str; > } > > diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h > index fe6c9a2c92..f5ff7294c6 100644 > --- a/target/riscv/cpu.h > +++ b/target/riscv/cpu.h > @@ -425,6 +425,8 @@ struct RISCVCPUConfig { > bool aia; > bool debug; > uint64_t resetvec; > + > + bool short_isa_string; > }; > > typedef struct RISCVCPUConfig RISCVCPUConfig; > -- > 2.34.1 >
