linux-kernel - Re: [PATCH] VMXNET3: Add support for virtual IOMMU

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Message-Id: <20130821.000255.1258155583733908892.davem@davemloft.net>
Date:	Wed, 21 Aug 2013 00:02:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	acking@...are.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, pv-drivers@...are.com
Subject: Re: [PATCH] VMXNET3: Add support for virtual IOMMU

From: Andy King <acking@...are.com>
Date: Tue, 20 Aug 2013 10:33:32 -0700

> We can't just do virt_to_phys() on memory that we pass to the device and
> expect it to work in presence of a virtual IOMMU.  We need to add IOMMU
> mappings for such DMAs to work correctly.  Fix that with
> pci_alloc_consistent() where possible, or pci_map_single() where the
> mapping is short-lived or we don't control the allocation (netdev).
> 
> Also fix two small bugs:
> 1) use after free of rq->buf_info in vmxnet3_rq_destroy()
> 2) a cpu_to_le32() that should have been a cpu_to_le64()
> 
> Acked-by: George Zhang <georgezhang@...are.com>
> Acked-by: Aditya Sarwade <asarwade@...are.com>
> Signed-off-by: Andy King <acking@...are.com>

Please use dma_alloc_coherent() (or in fact dma_zalloc_coherent()),
dma_map_single() et al., because they are preferred and in particular
allow specification of GFP_* flags.
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