From: longli@linuxonhyperv.com
To: "K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Long Li <longli@microsoft.com>, stable@vger.kernel.org
Subject: [Patch v2 3/4] uio_hv_generic: Adjust ring size according to system page alignment
Date: Wed, 30 Apr 2025 15:05:57 -0700 [thread overview]
Message-ID: <1746050758-6829-4-git-send-email-longli@linuxonhyperv.com> (raw)
In-Reply-To: <1746050758-6829-1-git-send-email-longli@linuxonhyperv.com>
From: Long Li <longli@microsoft.com>
Following the ring header, the ring data should align to system page
boundary. Adjust the size if necessary.
Cc: stable@vger.kernel.org
Fixes: 95096f2fbd10 ("uio-hv-generic: new userspace i/o driver for VMBus")
Signed-off-by: Long Li <longli@microsoft.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
next prev parent reply other threads:[~2025-04-30 22:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1746050758-6829-1-git-send-email-longli@linuxonhyperv.com>
2025-04-30 22:05 ` [Patch v2 1/4] Drivers: hv: Allocate interrupt and monitor pages aligned to system page boundary longli
2025-05-01 1:55 ` Michael Kelley
2025-05-06 0:58 ` Long Li
2025-04-30 22:05 ` [Patch v2 2/4] uio_hv_generic: Use correct size for interrupt and monitor pages longli
2025-05-01 1:55 ` Michael Kelley
2025-04-30 22:05 ` longli [this message]
2025-05-01 1:56 ` [Patch v2 3/4] uio_hv_generic: Adjust ring size according to system page alignment Michael Kelley
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