Re: [PATCH v2 8/9] hw/riscv: virt: Allow support for 32 cores

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Re: [PATCH v2 8/9] hw/riscv: virt: Allow support for 32 cores

From:	Alistair Francis
Subject:	Re: [PATCH v2 8/9] hw/riscv: virt: Allow support for 32 cores
Date:	Mon, 20 Dec 2021 15:41:38 +1000

On Thu, Dec 16, 2021 at 6:18 PM Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>
> On 12/16/21 06:58, Anup Patel wrote:
> > On Thu, Dec 16, 2021 at 10:27 AM Alistair Francis
> > <alistair.francis@opensource.wdc.com> wrote:
> >>
> >> From: Alistair Francis <alistair.francis@wdc.com>
> >>
> >> Linux supports up to 32 cores for both 32-bit and 64-bit RISC-V, so
> >> let's set that as the maximum for the virt board.
> >>
> >> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/435
> >> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
>
> > IMO, we should keep QEMU VIRT_CPUS_MAX as high as
> > possible to allow any kind of software Linux, OpenSBI, FreeBSD,
> > Xvisor, Xen, etc. Let the guest software decide it's own limit (such
> > as NR_CPUS of Linux).
>
> Agreed.

I agree as well. I'm happy to increase this in the future, the problem
is that I am only able to test it with 32 cores on Linux.

Alistair

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Re: [PATCH v2 5/9] target/riscv: Mark the Hypervisor extension as non experimental, (continued)
- [PATCH v2 6/9] target/riscv: Enable the Hypervisor extension by default, Alistair Francis, 2021/12/15
  - Re: [PATCH v2 6/9] target/riscv: Enable the Hypervisor extension by default, Anup Patel, 2021/12/16
  - Re: [PATCH v2 6/9] target/riscv: Enable the Hypervisor extension by default, Bin Meng, 2021/12/19
- [PATCH v2 7/9] hw/riscv: Use error_fatal for SoC realisation, Alistair Francis, 2021/12/15
  - Re: [PATCH v2 7/9] hw/riscv: Use error_fatal for SoC realisation, Bin Meng, 2021/12/20
- [PATCH v2 8/9] hw/riscv: virt: Allow support for 32 cores, Alistair Francis, 2021/12/15
  - Re: [PATCH v2 8/9] hw/riscv: virt: Allow support for 32 cores, Anup Patel, 2021/12/16
    - Re: [PATCH v2 8/9] hw/riscv: virt: Allow support for 32 cores, Philippe Mathieu-Daudé, 2021/12/16
    - Re: [PATCH v2 8/9] hw/riscv: virt: Allow support for 32 cores, Alistair Francis <=
  - Re: [PATCH v2 8/9] hw/riscv: virt: Allow support for 32 cores, Bin Meng, 2021/12/20
- [PATCH v2 9/9] hw/riscv: virt: Set the clock-frequency, Alistair Francis, 2021/12/15
  - Re: [PATCH v2 9/9] hw/riscv: virt: Set the clock-frequency, Anup Patel, 2021/12/16
  - Re: [PATCH v2 9/9] hw/riscv: virt: Set the clock-frequency, Bin Meng, 2021/12/20
    - Re: [PATCH v2 9/9] hw/riscv: virt: Set the clock-frequency, Alistair Francis, 2021/12/21
    - Re: [PATCH v2 9/9] hw/riscv: virt: Set the clock-frequency, Bin Meng, 2021/12/21

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