linux-kernel - RE: [PATCH v3 10/11] Driver: hv: util: Make ringbuffer at least take two pages

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Message-ID: <MW2PR2101MB1052A7D9692511183D074DB4D7250@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Sat, 12 Sep 2020 19:40:09 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Boqun Feng <boqun.feng@...il.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     KY 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>,
        Dmitry Torokhov <dmitry.torokhov@...il.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>,
        "will@...nel.org" <will@...nel.org>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "Mark.Rutland@....com" <Mark.Rutland@....com>,
        "maz@...nel.org" <maz@...nel.org>
Subject: RE: [PATCH v3 10/11] Driver: hv: util: Make ringbuffer at least take
 two pages

From: Boqun Feng <boqun.feng@...il.com> Sent: Thursday, September 10, 2020 7:35 AM
> 
> 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 <boqun.feng@...il.com>
> ---
>  drivers/hv/hv_util.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>