Re: [PATCH 1/1] Drivers: hv: Move AEOI determination to architecture dependent code

From: Wei Liu
Date: Tue Apr 21 2020 - 05:07:12 EST


On Mon, Apr 20, 2020 at 09:49:26AM -0700, Michael Kelley wrote:
> Hyper-V on ARM64 doesn't provide a flag for the AEOI recommendation
> in ms_hyperv.hints, so having the test in architecture independent
> code doesn't work. Resolve this by moving the check of the flag
> to an architecture dependent helper function. No functionality is
> changed.
>
> Signed-off-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>

Applied to hyperv-fixes. Thanks.

> ---
> arch/x86/include/asm/mshyperv.h | 2 ++
> drivers/hv/hv.c | 6 +-----
> 2 files changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> index 1c42ecbe75cb..d30805ed323e 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -35,6 +35,8 @@ typedef int (*hyperv_fill_flush_list_func)(
> rdmsrl(HV_X64_MSR_SINT0 + int_num, val)
> #define hv_set_synint_state(int_num, val) \
> wrmsrl(HV_X64_MSR_SINT0 + int_num, val)
> +#define hv_recommend_using_aeoi() \
> + (!(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED))
>
> #define hv_get_crash_ctl(val) \
> rdmsrl(HV_X64_MSR_CRASH_CTL, val)
> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
> index 6098e0cbdb4b..533c8b82b344 100644
> --- a/drivers/hv/hv.c
> +++ b/drivers/hv/hv.c
> @@ -184,11 +184,7 @@ void hv_synic_enable_regs(unsigned int cpu)
>
> shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
> shared_sint.masked = false;
> - if (ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED)
> - shared_sint.auto_eoi = false;
> - else
> - shared_sint.auto_eoi = true;
> -
> + shared_sint.auto_eoi = hv_recommend_using_aeoi();
> hv_set_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
>
> /* Enable the global synic bit */
> --
> 2.18.2
>