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Date:   Wed, 2 Sep 2020 10:18:35 +0200 (CEST)
From:   Jiri Kosina <>
To:     Boqun Feng <>
cc:,,,,, "K. Y. Srinivasan" <>,
        Haiyang Zhang <>,
        Stephen Hemminger <>,
        Wei Liu <>,
        Benjamin Tissoires <>,
        Dmitry Torokhov <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        "James E.J. Bottomley" <>,
        "Martin K. Petersen" <>,
        Michael Kelley <>
Subject: Re: [RFC v2 09/11] HID: hyperv: Make ringbuffer at least take two

On Wed, 2 Sep 2020, Boqun Feng wrote:

> When PAGE_SIZE > HV_HYP_PAGE_SIZE, we need the ringbuffer size to be at
> least 2 * PAGE_SIZE: one page for the header and at least one page of
> the data part (because of the alignment requirement for double mapping).
> So make sure the ringbuffer sizes to be at least 2 * PAGE_SIZE when
> using vmbus_open() to establish the vmbus connection.
> Signed-off-by: Boqun Feng <>

Acked-by: Jiri Kosina <>

Jiri Kosina

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