linux-kernel - RE: [Patch v2 3/4] uio_hv_generic: Adjust ring size according to system page alignment

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Message-ID:
 <SN6PR02MB4157012E94E1C90609860357D4822@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Thu, 1 May 2025 01:56:00 +0000
From: Michael Kelley <mhklinux@...look.com>
To: "longli@...uxonhyperv.com" <longli@...uxonhyperv.com>, "K. Y. Srinivasan"
	<kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu
	<wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>, Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>, "linux-hyperv@...r.kernel.org"
	<linux-hyperv@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: Long Li <longli@...rosoft.com>, "stable@...r.kernel.org"
	<stable@...r.kernel.org>
Subject: RE: [Patch v2 3/4] uio_hv_generic: Adjust ring size according to
 system page alignment

From: longli@...uxonhyperv.com <longli@...uxonhyperv.com> Sent: Wednesday, April 30, 2025 3:06 PM
> 
> Following the ring header, the ring data should align to system page
> boundary. Adjust the size if necessary.
> 
> Cc: stable@...r.kernel.org
> Fixes: 95096f2fbd10 ("uio-hv-generic: new userspace i/o driver for VMBus")
> Signed-off-by: Long Li <longli@...rosoft.com>
> ---
>  drivers/uio/uio_hv_generic.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
> index 08385b04c4ab..dfc5f0e1a254 100644
> --- a/drivers/uio/uio_hv_generic.c
> +++ b/drivers/uio/uio_hv_generic.c
> @@ -256,6 +256,12 @@ hv_uio_probe(struct hv_device *dev,
>  	if (!ring_size)
>  		ring_size = SZ_2M;
> 
> +	/*
> +	 * Adjust ring size if necessary to have the ring data region page
> +	 * aligned
> +	 */
> +	ring_size = VMBUS_RING_SIZE(ring_size);
> +
>  	pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL);
>  	if (!pdata)
>  		return -ENOMEM;
> --
> 2.34.1
> 

Reviewed-by: Michael Kelley <mhklinux@...look.com>