On Fri, Apr 16, 2021 at 05:43:02PM -0700, Joseph Salisbury wrote:
> From: Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>
>
> 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.salisbury@xxxxxxxxxxxxx>
> ---
[...]
> +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();
This seems to be missing in Arm. Does it compile?
Wei.
> + } 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
>
