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From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
	sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
	tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
	davem@davemloft.net, kuba@kernel.org, hch@infradead.org,
	m.szyprowski@samsung.com, robin.murphy@arm.com,
	michael.h.kelley@microsoft.com
Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>,
	iommu@lists.linux-foundation.org, linux-hyperv@vger.kernel.org,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH] Netvsc: Call hv_unmap_memory() in the netvsc_device_remove()
Date: Tue,  1 Feb 2022 11:32:11 -0500	[thread overview]
Message-ID: <20220201163211.467423-1-ltykernel@gmail.com> (raw)

From: Tianyu Lan <Tianyu.Lan@microsoft.com>

netvsc_device_remove() calls vunmap() inside which should not be
called in the interrupt context. Current code calls hv_unmap_memory()
in the free_netvsc_device() which is rcu callback and maybe called
in the interrupt context. This will trigger BUG_ON(in_interrupt())
in the vunmap(). Fix it via moving hv_unmap_memory() to netvsc_device_
remove().

Fixes: 846da38de0e8 ("net: netvsc: Add Isolation VM support for netvsc driver")
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
 drivers/net/hyperv/netvsc.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index afa81a9480cc..f989f920d4ce 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -154,19 +154,15 @@ static void free_netvsc_device(struct rcu_head *head)
 
 	kfree(nvdev->extension);
 
-	if (nvdev->recv_original_buf) {
-		hv_unmap_memory(nvdev->recv_buf);
+	if (nvdev->recv_original_buf)
 		vfree(nvdev->recv_original_buf);
-	} else {
+	else
 		vfree(nvdev->recv_buf);
-	}
 
-	if (nvdev->send_original_buf) {
-		hv_unmap_memory(nvdev->send_buf);
+	if (nvdev->send_original_buf)
 		vfree(nvdev->send_original_buf);
-	} else {
+	else
 		vfree(nvdev->send_buf);
-	}
 
 	bitmap_free(nvdev->send_section_map);
 
@@ -765,6 +761,12 @@ void netvsc_device_remove(struct hv_device *device)
 		netvsc_teardown_send_gpadl(device, net_device, ndev);
 	}
 
+	if (net_device->recv_original_buf)
+		hv_unmap_memory(net_device->recv_buf);
+
+	if (net_device->send_original_buf)
+		hv_unmap_memory(net_device->send_buf);
+
 	/* Release all resources */
 	free_netvsc_device_rcu(net_device);
 }
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
	sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
	tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
	davem@davemloft.net, kuba@kernel.org, hch@infradead.org,
	m.szyprowski@samsung.com, robin.murphy@arm.com,
	michael.h.kelley@microsoft.com
Cc: netdev@vger.kernel.org, iommu@lists.linux-foundation.org,
	Tianyu Lan <Tianyu.Lan@microsoft.com>,
	linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] Netvsc: Call hv_unmap_memory() in the netvsc_device_remove()
Date: Tue,  1 Feb 2022 11:32:11 -0500	[thread overview]
Message-ID: <20220201163211.467423-1-ltykernel@gmail.com> (raw)

From: Tianyu Lan <Tianyu.Lan@microsoft.com>

netvsc_device_remove() calls vunmap() inside which should not be
called in the interrupt context. Current code calls hv_unmap_memory()
in the free_netvsc_device() which is rcu callback and maybe called
in the interrupt context. This will trigger BUG_ON(in_interrupt())
in the vunmap(). Fix it via moving hv_unmap_memory() to netvsc_device_
remove().

Fixes: 846da38de0e8 ("net: netvsc: Add Isolation VM support for netvsc driver")
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
 drivers/net/hyperv/netvsc.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index afa81a9480cc..f989f920d4ce 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -154,19 +154,15 @@ static void free_netvsc_device(struct rcu_head *head)
 
 	kfree(nvdev->extension);
 
-	if (nvdev->recv_original_buf) {
-		hv_unmap_memory(nvdev->recv_buf);
+	if (nvdev->recv_original_buf)
 		vfree(nvdev->recv_original_buf);
-	} else {
+	else
 		vfree(nvdev->recv_buf);
-	}
 
-	if (nvdev->send_original_buf) {
-		hv_unmap_memory(nvdev->send_buf);
+	if (nvdev->send_original_buf)
 		vfree(nvdev->send_original_buf);
-	} else {
+	else
 		vfree(nvdev->send_buf);
-	}
 
 	bitmap_free(nvdev->send_section_map);
 
@@ -765,6 +761,12 @@ void netvsc_device_remove(struct hv_device *device)
 		netvsc_teardown_send_gpadl(device, net_device, ndev);
 	}
 
+	if (net_device->recv_original_buf)
+		hv_unmap_memory(net_device->recv_buf);
+
+	if (net_device->send_original_buf)
+		hv_unmap_memory(net_device->send_buf);
+
 	/* Release all resources */
 	free_netvsc_device_rcu(net_device);
 }
-- 
2.25.1

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

             reply	other threads:[~2022-02-01 16:32 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-01 16:32 Tianyu Lan [this message]
2022-02-01 16:32 ` [PATCH] Netvsc: Call hv_unmap_memory() in the netvsc_device_remove() Tianyu Lan
2022-02-01 23:20 ` Haiyang Zhang
2022-02-01 23:20   ` Haiyang Zhang via iommu
2022-02-02 17:05 ` Michael Kelley (LINUX)
2022-02-02 17:05   ` Michael Kelley (LINUX) via iommu
2022-02-08 14:19   ` Tianyu Lan
2022-02-08 14:19     ` Tianyu Lan

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