linux-kernel - Re: [PATCH v2 3/7] RISC-V: KVM: Drop the _MASK suffix from hgatp.VMID mask defines

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Date:   Tue, 31 Jan 2023 01:27:48 -0800
From:   Atish Patra <atishp@...shpatra.org>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] RISC-V: KVM: Drop the _MASK suffix from hgatp.VMID
 mask defines

On Fri, Jan 27, 2023 at 11:28 PM Anup Patel <apatel@...tanamicro.com> wrote:
>
> The hgatp.VMID mask defines are used before shifting when extracting
> VMID value from hgatp CSR value so based on the convention followed
> in the other parts of asm/csr.h, the hgatp.VMID mask defines should
> not have a _MASK suffix.
>
> While we are here, let's use GENMASK() for hgatp.VMID and hgatp.PPN.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  arch/riscv/include/asm/csr.h | 12 ++++++------
>  arch/riscv/kvm/mmu.c         |  3 +--
>  arch/riscv/kvm/vmid.c        |  4 ++--
>  3 files changed, 9 insertions(+), 10 deletions(-)
>
> diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
> index 3c8d68152bce..3176355cf4e9 100644
> --- a/arch/riscv/include/asm/csr.h
> +++ b/arch/riscv/include/asm/csr.h
> @@ -131,25 +131,25 @@
>
>  #define HGATP32_MODE_SHIFT     31
>  #define HGATP32_VMID_SHIFT     22
> -#define HGATP32_VMID_MASK      _AC(0x1FC00000, UL)
> -#define HGATP32_PPN            _AC(0x003FFFFF, UL)
> +#define HGATP32_VMID           GENMASK(28, 22)
> +#define HGATP32_PPN            GENMASK(21, 0)
>
>  #define HGATP64_MODE_SHIFT     60
>  #define HGATP64_VMID_SHIFT     44
> -#define HGATP64_VMID_MASK      _AC(0x03FFF00000000000, UL)
> -#define HGATP64_PPN            _AC(0x00000FFFFFFFFFFF, UL)
> +#define HGATP64_VMID           GENMASK(57, 44)
> +#define HGATP64_PPN            GENMASK(43, 0)
>
>  #define HGATP_PAGE_SHIFT       12
>
>  #ifdef CONFIG_64BIT
>  #define HGATP_PPN              HGATP64_PPN
>  #define HGATP_VMID_SHIFT       HGATP64_VMID_SHIFT
> -#define HGATP_VMID_MASK                HGATP64_VMID_MASK
> +#define HGATP_VMID             HGATP64_VMID
>  #define HGATP_MODE_SHIFT       HGATP64_MODE_SHIFT
>  #else
>  #define HGATP_PPN              HGATP32_PPN
>  #define HGATP_VMID_SHIFT       HGATP32_VMID_SHIFT
> -#define HGATP_VMID_MASK                HGATP32_VMID_MASK
> +#define HGATP_VMID             HGATP32_VMID
>  #define HGATP_MODE_SHIFT       HGATP32_MODE_SHIFT
>  #endif
>
> diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
> index dbc4ca060174..829a7065ae01 100644
> --- a/arch/riscv/kvm/mmu.c
> +++ b/arch/riscv/kvm/mmu.c
> @@ -748,8 +748,7 @@ void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu)
>         unsigned long hgatp = gstage_mode;
>         struct kvm_arch *k = &vcpu->kvm->arch;
>
> -       hgatp |= (READ_ONCE(k->vmid.vmid) << HGATP_VMID_SHIFT) &
> -                HGATP_VMID_MASK;
> +       hgatp |= (READ_ONCE(k->vmid.vmid) << HGATP_VMID_SHIFT) & HGATP_VMID;
>         hgatp |= (k->pgd_phys >> PAGE_SHIFT) & HGATP_PPN;
>
>         csr_write(CSR_HGATP, hgatp);
> diff --git a/arch/riscv/kvm/vmid.c b/arch/riscv/kvm/vmid.c
> index 6cd93995fb65..6f4d4979a759 100644
> --- a/arch/riscv/kvm/vmid.c
> +++ b/arch/riscv/kvm/vmid.c
> @@ -26,9 +26,9 @@ void kvm_riscv_gstage_vmid_detect(void)
>
>         /* Figure-out number of VMID bits in HW */
>         old = csr_read(CSR_HGATP);
> -       csr_write(CSR_HGATP, old | HGATP_VMID_MASK);
> +       csr_write(CSR_HGATP, old | HGATP_VMID);
>         vmid_bits = csr_read(CSR_HGATP);
> -       vmid_bits = (vmid_bits & HGATP_VMID_MASK) >> HGATP_VMID_SHIFT;
> +       vmid_bits = (vmid_bits & HGATP_VMID) >> HGATP_VMID_SHIFT;
>         vmid_bits = fls_long(vmid_bits);
>         csr_write(CSR_HGATP, old);
>
> --
> 2.34.1
>

Reviewed-by: Atish Patra <atishp@...osinc.com>

-- 
Regards,
Atish