Hi Amit,
On 19/03/2019 08:30, Amit Daniel Kachhap wrote:
> Currently hyp_symbol_addr is palced in kvm_mmu.h which is mostly
> used by __hyp_this_cpu_ptr in kvm_asm.h but it cannot include
> kvm_mmu.h directly as kvm_mmu.h uses kvm_ksym_ref which is
> defined inside kvm_asm.h. Hence, hyp_symbol_addr is moved inside
> kvm_asm.h to fix this dependency on each other.
>
> Also kvm_ksym_ref is corresponding counterpart of hyp_symbol_addr
> so should be ideally placed inside kvm_asm.h.
>
This part is a bit confusing, it lead me to think that kvm_ksym_ref was
in kvm_mmu.h and should moved to kvm_asm.h as well. I'd suggest
rephrasing it with something along the lines:
"Also, hyp_symbol_addr corresponding counterpart, kvm_ksym_ref, is
already in kvm_asm.h, making it more sensible to move kvm_symbol_addr to
the same file."
Otherwise:
Reviewed-by: Julien Thierry <julien.thierry@xxxxxxx>
Cheers,
Julien
> Suggested by: James Morse <james.morse@xxxxxxx>
> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@xxxxxxx>
> Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
> Cc: Christoffer Dall <christoffer.dall@xxxxxxx>
> Cc: kvmarm@xxxxxxxxxxxxxxxxxxxxx
> ---
> arch/arm64/include/asm/kvm_asm.h | 20 ++++++++++++++++++++
> arch/arm64/include/asm/kvm_mmu.h | 20 --------------------
> 2 files changed, 20 insertions(+), 20 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
> index f5b79e9..57a07e8 100644
> --- a/arch/arm64/include/asm/kvm_asm.h
> +++ b/arch/arm64/include/asm/kvm_asm.h
> @@ -80,6 +80,26 @@ extern void __vgic_v3_init_lrs(void);
>
> extern u32 __kvm_get_mdcr_el2(void);
>
> +/*
> + * Obtain the PC-relative address of a kernel symbol
> + * s: symbol
> + *
> + * The goal of this macro is to return a symbol's address based on a
> + * PC-relative computation, as opposed to a loading the VA from a
> + * constant pool or something similar. This works well for HYP, as an
> + * absolute VA is guaranteed to be wrong. Only use this if trying to
> + * obtain the address of a symbol (i.e. not something you obtained by
> + * following a pointer).
> + */
> +#define hyp_symbol_addr(s) \
> + ({ \
> + typeof(s) *addr; \
> + asm("adrp %0, %1\n" \
> + "add %0, %0, :lo12:%1\n" \
> + : "=r" (addr) : "S" (&s)); \
> + addr; \
> + })
> +
> /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
> #define __hyp_this_cpu_ptr(sym) \
> ({ \
> diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
> index b0742a1..3dea6af 100644
> --- a/arch/arm64/include/asm/kvm_mmu.h
> +++ b/arch/arm64/include/asm/kvm_mmu.h
> @@ -118,26 +118,6 @@ static inline unsigned long __kern_hyp_va(unsigned long v)
> #define kern_hyp_va(v) ((typeof(v))(__kern_hyp_va((unsigned long)(v))))
>
> /*
> - * Obtain the PC-relative address of a kernel symbol
> - * s: symbol
> - *
> - * The goal of this macro is to return a symbol's address based on a
> - * PC-relative computation, as opposed to a loading the VA from a
> - * constant pool or something similar. This works well for HYP, as an
> - * absolute VA is guaranteed to be wrong. Only use this if trying to
> - * obtain the address of a symbol (i.e. not something you obtained by
> - * following a pointer).
> - */
> -#define hyp_symbol_addr(s) \
> - ({ \
> - typeof(s) *addr; \
> - asm("adrp %0, %1\n" \
> - "add %0, %0, :lo12:%1\n" \
> - : "=r" (addr) : "S" (&s)); \
> - addr; \
> - })
> -
> -/*
> * We currently support using a VM-specified IPA size. For backward
> * compatibility, the default IPA size is fixed to 40bits.
> */
>
--
Julien Thierry
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