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

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Message-ID: <20230126161147.6rewhfvlouqn4ual@orel>
Date:   Thu, 26 Jan 2023 17:11:47 +0100
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Anup Patel <apatel@...tanamicro.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Atish Patra <atishp@...shpatra.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.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 3/7] RISC-V: KVM: Drop the _MASK suffix from hgatp.VMID
 mask defines

On Thu, Jan 12, 2023 at 07:33:00PM +0530, Anup Patel 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.
> 
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> ---
>  arch/riscv/include/asm/csr.h | 8 ++++----
>  arch/riscv/kvm/mmu.c         | 3 +--
>  arch/riscv/kvm/vmid.c        | 4 ++--
>  3 files changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
> index d608dac4b19f..36d580528f90 100644
> --- a/arch/riscv/include/asm/csr.h
> +++ b/arch/riscv/include/asm/csr.h
> @@ -131,12 +131,12 @@
>  
>  #define HGATP32_MODE_SHIFT	31
>  #define HGATP32_VMID_SHIFT	22
> -#define HGATP32_VMID_MASK	_AC(0x1FC00000, UL)
> +#define HGATP32_VMID		_AC(0x1FC00000, UL)
>  #define HGATP32_PPN		_AC(0x003FFFFF, UL)
>  
>  #define HGATP64_MODE_SHIFT	60
>  #define HGATP64_VMID_SHIFT	44
> -#define HGATP64_VMID_MASK	_AC(0x03FFF00000000000, UL)
> +#define HGATP64_VMID		_AC(0x03FFF00000000000, UL)
>  #define HGATP64_PPN		_AC(0x00000FFFFFFFFFFF, UL)
>  
>  #define HGATP_PAGE_SHIFT	12
> @@ -144,12 +144,12 @@
>  #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 34b57e0be2ef..034746638fa6 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
>

Could switch to GENMASK too at the same time :-)

Anyway,

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>

Thanks,
drew