Re: [PATCH RFC v5 05/12] target/riscv: Implement kvm_arch_put_registers

From: Alistair Francis <alistair23@gmail.com>
To: Yifei Jiang <jiangyifei@huawei.com>
Cc: "qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>,
	"open list:RISC-V" <qemu-riscv@nongnu.org>,
	Bin Meng <bin.meng@windriver.com>,
	Sagar Karandikar <sagark@eecs.berkeley.edu>,
	"open list:Overall" <kvm@vger.kernel.org>,
	libvir-list@redhat.com,
	Bastian Koppelmann <kbastian@mail.uni-paderborn.de>,
	Anup Patel <anup.patel@wdc.com>,
	yinyipeng <yinyipeng1@huawei.com>,
	Alistair Francis <Alistair.Francis@wdc.com>,
	kvm-riscv@lists.infradead.org,
	Palmer Dabbelt <palmer@dabbelt.com>,
	fanliang@huawei.com, "Wubin (H)" <wu.wubin@huawei.com>,
	Zhanghailiang <zhang.zhanghailiang@huawei.com>
Subject: Re: [PATCH RFC v5 05/12] target/riscv: Implement kvm_arch_put_registers
Date: Thu, 15 Apr 2021 08:46:07 +1000	[thread overview]
Message-ID: <CAKmqyKMgh0uTSoUrJW8O73i37rpwFoz7s1QZNgNf+8HKBfXRnA@mail.gmail.com> (raw)
In-Reply-To: <20210412065246.1853-6-jiangyifei@huawei.com>

On Mon, Apr 12, 2021 at 4:56 PM Yifei Jiang <jiangyifei@huawei.com> wrote:
>
> Put GPR CSR and FP registers to kvm by KVM_SET_ONE_REG ioctl
>
> Signed-off-by: Yifei Jiang <jiangyifei@huawei.com>
> Signed-off-by: Yipeng Yin <yinyipeng1@huawei.com>
> ---
>  target/riscv/kvm.c | 142 ++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 141 insertions(+), 1 deletion(-)
>
> diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
> index 63485d7b65..9d1441952a 100644
> --- a/target/riscv/kvm.c
> +++ b/target/riscv/kvm.c
> @@ -85,6 +85,31 @@ static int kvm_riscv_get_regs_core(CPUState *cs)
>      return ret;
>  }
>
> +static int kvm_riscv_put_regs_core(CPUState *cs)
> +{
> +    int ret = 0;
> +    int i;
> +    target_ulong reg;
> +    CPURISCVState *env = &RISCV_CPU(cs)->env;
> +
> +    reg = env->pc;
> +    ret = kvm_set_one_reg(cs, RISCV_CORE_REG(env, regs.pc), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    for (i = 1; i < 32; i++) {
> +        __u64 id = kvm_riscv_reg_id(env, KVM_REG_RISCV_CORE, i);

Can you use uint64_t for the entire series instead?

> +        reg = env->gpr[i];
> +        ret = kvm_set_one_reg(cs, id, &reg);
> +        if (ret) {
> +            return ret;
> +        }
> +    }
> +
> +    return ret;
> +}
> +
>  static int kvm_riscv_get_regs_csr(CPUState *cs)
>  {
>      int ret = 0;
> @@ -148,6 +173,70 @@ static int kvm_riscv_get_regs_csr(CPUState *cs)
>      return ret;
>  }
>
> +static int kvm_riscv_put_regs_csr(CPUState *cs)
> +{
> +    int ret = 0;
> +    target_ulong reg;
> +    CPURISCVState *env = &RISCV_CPU(cs)->env;
> +
> +    reg = env->mstatus;
> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, sstatus), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    reg = env->mie;
> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, sie), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    reg = env->stvec;
> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, stvec), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    reg = env->sscratch;
> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, sscratch), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    reg = env->sepc;
> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, sepc), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    reg = env->scause;
> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, scause), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    reg = env->sbadaddr;

This will change soon-ish as my next PR converts this to stval.

> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, stval), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    reg = env->mip;
> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, sip), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    reg = env->satp;
> +    ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, satp), &reg);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    return ret;
> +}
> +
> +

Double line here.

Otherwise:

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

>  static int kvm_riscv_get_regs_fp(CPUState *cs)
>  {
>      int ret = 0;
> @@ -181,6 +270,40 @@ static int kvm_riscv_get_regs_fp(CPUState *cs)
>      return ret;
>  }
>
> +static int kvm_riscv_put_regs_fp(CPUState *cs)
> +{
> +    int ret = 0;
> +    int i;
> +    CPURISCVState *env = &RISCV_CPU(cs)->env;
> +
> +    if (riscv_has_ext(env, RVD)) {
> +        uint64_t reg;
> +        for (i = 0; i < 32; i++) {
> +            reg = env->fpr[i];
> +            ret = kvm_set_one_reg(cs, RISCV_FP_D_REG(env, i), &reg);
> +            if (ret) {
> +                return ret;
> +            }
> +        }
> +        return ret;
> +    }
> +
> +    if (riscv_has_ext(env, RVF)) {
> +        uint32_t reg;
> +        for (i = 0; i < 32; i++) {
> +            reg = env->fpr[i];
> +            ret = kvm_set_one_reg(cs, RISCV_FP_F_REG(env, i), &reg);
> +            if (ret) {
> +                return ret;
> +            }
> +        }
> +        return ret;
> +    }
> +
> +    return ret;
> +}
> +
> +
>  const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
>      KVM_CAP_LAST_INFO
>  };
> @@ -209,7 +332,24 @@ int kvm_arch_get_registers(CPUState *cs)
>
>  int kvm_arch_put_registers(CPUState *cs, int level)
>  {
> -    return 0;
> +    int ret = 0;
> +
> +    ret = kvm_riscv_put_regs_core(cs);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    ret = kvm_riscv_put_regs_csr(cs);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    ret = kvm_riscv_put_regs_fp(cs);
> +    if (ret) {
> +        return ret;
> +    }
> +
> +    return ret;
>  }
>
>  int kvm_arch_release_virq_post(int virq)
> --
> 2.19.1
>
>