linux-kernel - Re: [PATCH v4 08/11] Input: hyperv-keyboard: Use VMBUS_RING

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Date:   Tue, 15 Sep 2020 21:05:11 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     linux-hyperv@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Michael Kelley <mikelley@...rosoft.com>, will@...nel.org,
        ardb@...nel.org, arnd@...db.de, catalin.marinas@....com,
        mark.rutland@....com, maz@...nel.org
Subject: Re: [PATCH v4 08/11] Input: hyperv-keyboard: Use VMBUS_RING_SIZE()
 for ringbuffer sizes

On Wed, Sep 16, 2020 at 11:48:14AM +0800, Boqun Feng wrote:
> For a Hyper-V vmbus, the size of the ringbuffer has two requirements:
> 
> 1)	it has to take one PAGE_SIZE for the header
> 
> 2)	it has to be PAGE_SIZE aligned so that double-mapping can work
> 
> VMBUS_RING_SIZE() could calculate a correct ringbuffer size which
> fulfills both requirements, therefore use it to make sure vmbus work
> when PAGE_SIZE != HV_HYP_PAGE_SIZE (4K).
> 
> Note that since the argument for VMBUS_RING_SIZE() is the size of
> payload (data part), so it will be minus 4k (the size of header when
> PAGE_SIZE = 4k) than the original value to keep the ringbuffer total
> size unchanged when PAGE_SIZE = 4k.
> 
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> Cc: Michael Kelley <mikelley@...rosoft.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>

Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

Please feel free to merge through whatever tree the rest of the patches
will go.

Thanks.

-- 
Dmitry