From: Joseph Salisbury <joseph.salisb...@linux.microsoft.com> Sent: Friday,
April 16, 2021 5:43 PM
>
> This patch makes no functional changes. It simply moves hv_do_rep_hypercall()
> out of arch/x86/include/asm/mshyperv.h and into asm-generic/mshyperv.h
>
> hv_do_rep_hypercall() is architecture independent, so it makes sense that it
> should be in the architecture independent mshyperv.h, not in the x86-specific
> mshyperv.h.
>
> This is done in preperation for a follow up patch which creates a consistent
> pattern for checking Hyper-V hypercall status.
>
> Signed-off-by: Joseph Salisbury <joseph.salisb...@microsoft.com>
> ---
> arch/x86/include/asm/mshyperv.h | 32 --------------------------------
> include/asm-generic/mshyperv.h | 31 +++++++++++++++++++++++++++++++
> 2 files changed, 31 insertions(+), 32 deletions(-)
>
> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> index ccf60a809a17..bfc98b490f07 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -189,38 +189,6 @@ static inline u64 hv_do_fast_hypercall16(u16 code, u64
> input1, u64
> input2)
> return hv_status;
> }
>
> -/*
> - * Rep hypercalls. Callers of this functions are supposed to ensure that
> - * rep_count and varhead_size comply with Hyper-V hypercall definition.
> - */
> -static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16
> varhead_size,
> - void *input, void *output)
> -{
> - u64 control = code;
> - u64 status;
> - u16 rep_comp;
> -
> - control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
> - control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
> -
> - do {
> - status = hv_do_hypercall(control, input, output);
> - if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
> - return status;
> -
> - /* Bits 32-43 of status have 'Reps completed' data. */
> - rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
> - HV_HYPERCALL_REP_COMP_OFFSET;
> -
> - control &= ~HV_HYPERCALL_REP_START_MASK;
> - control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
> -
> - touch_nmi_watchdog();
> - } while (rep_comp < rep_count);
> -
> - return status;
> -}
> -
> extern struct hv_vp_assist_page **hv_vp_assist_page;
>
> static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int
> cpu)
> diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
> index dff58a3db5d5..a5246a6ea02d 100644
> --- a/include/asm-generic/mshyperv.h
> +++ b/include/asm-generic/mshyperv.h
> @@ -41,6 +41,37 @@ extern struct ms_hyperv_info ms_hyperv;
> extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);
> extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);
>
> +/*
> + * Rep hypercalls. Callers of this functions are supposed to ensure that
> + * rep_count and varhead_size comply with Hyper-V hypercall definition.
> + */
> +static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16
> varhead_size,
> + void *input, void *output)
> +{
> + u64 control = code;
> + u64 status;
> + u16 rep_comp;
> +
> + control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
> + control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
> +
> + do {
> + status = hv_do_hypercall(control, input, output);
> + if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
> + return status;
> +
> + /* Bits 32-43 of status have 'Reps completed' data. */
> + rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
> + HV_HYPERCALL_REP_COMP_OFFSET;
> +
> + control &= ~HV_HYPERCALL_REP_START_MASK;
> + control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
> +
> + touch_nmi_watchdog();
> + } while (rep_comp < rep_count);
> +
> + return status;
> +}
>
> /* Generate the guest OS identifier as described in the Hyper-V TLFS */
> static inline __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,
> --
> 2.17.1
Reviewed-by: Michael Kelley <mikel...@microsoft.com>
