linux-kernel - Re: [PATCH v2 3/5] hv: vmbus: Replace page definition with Hyper-V specific one

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Date:   Wed, 12 Jun 2019 12:38:08 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Maya Nakamura <m.maya.nakamura@...il.com>
Cc:     x86@...nel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, mikelley@...rosoft.com,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        sashal@...nel.org
Subject: Re: [PATCH v2 3/5] hv: vmbus: Replace page definition with Hyper-V specific one

Maya Nakamura <m.maya.nakamura@...il.com> writes:

> Replace PAGE_SIZE with HV_HYP_PAGE_SIZE because the guest page size may
> not be 4096 on all architectures and Hyper-V always runs with a page
> size of 4096.
>
> Signed-off-by: Maya Nakamura <m.maya.nakamura@...il.com>
> ---
>  drivers/hv/hyperv_vmbus.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
> index e5467b821f41..5489b061d261 100644
> --- a/drivers/hv/hyperv_vmbus.h
> +++ b/drivers/hv/hyperv_vmbus.h
> @@ -208,11 +208,11 @@ int hv_ringbuffer_read(struct vmbus_channel *channel,
>  		       u64 *requestid, bool raw);
>  
>  /*
> - * Maximum channels is determined by the size of the interrupt page
> - * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
> - * and the other is receive endpoint interrupt
> + * Maximum channels, 16348, is determined by the size of the interrupt page,
> + * which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to send endpoint
> + * interrupt, and the other is to receive endpoint interrupt.
>   */
> -#define MAX_NUM_CHANNELS	((PAGE_SIZE >> 1) << 3)	/* 16348 channels */
> +#define MAX_NUM_CHANNELS	((HV_HYP_PAGE_SIZE >> 1) << 3)
>  
>  /* The value here must be in multiple of 32 */
>  /* TODO: Need to make this configurable */

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

-- 
Vitaly