Re: [PULL 22/23] hw/riscv: Use the CPU to determine if 32-bit

[Peter Maydell]

On Fri, 18 Dec 2020 at 06:01, Alistair Francis <alistair.francis@wdc.com> wrote:
>
> Instead of using string compares to determine if a RISC-V machine is
> using 32-bit or 64-bit CPUs we can use the initalised CPUs. This avoids
> us having to maintain a list of CPU names to compare against.
>
> This commit also fixes the name of the function to match the
> riscv_cpu_is_32bit() function.
>
> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Message-id: 
> 8ab7614e5df93ab5267788b73dcd75f9f5615e82.1608142916.git.alistair.francis@wdc.com

Hi; coverity points out a probably-unintentional inefficiency here
(CID 1438099, CID 1438100, CID 1438101):

> --- a/hw/riscv/boot.c
> +++ b/hw/riscv/boot.c
> @@ -33,28 +33,16 @@
>
>  #include <libfdt.h>
>
> -bool riscv_is_32_bit(MachineState *machine)
> +bool riscv_is_32bit(RISCVHartArrayState harts)

The RISCVHartArrayState type is 824 bytes long. That's a very
big type to be passing by value. You probably wanted to pass a
pointer to it instead. Similarly for the arguments to
riscv_calc_kernel_start_addr() and riscv_setup_rom_reset_vec().

thanks
-- PMM