linux-kernel - Re: [PATCH net 1/1] hv_netvsc: Fix missed pagebuf entries in netvsc_dma

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Date:   Thu, 02 Feb 2023 08:40:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Michael Kelley (LINUX) <mikelley@...rosoft.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH net 1/1] hv_netvsc: Fix missed pagebuf entries in
 netvsc_dma_map/unmap()

Hello:

This patch was applied to netdev/net.git (master)
by Paolo Abeni <pabeni@...hat.com>:

On Mon, 30 Jan 2023 19:33:06 -0800 you wrote:
> netvsc_dma_map() and netvsc_dma_unmap() currently check the cp_partial
> flag and adjust the page_count so that pagebuf entries for the RNDIS
> portion of the message are skipped when it has already been copied into
> a send buffer. But this adjustment has already been made by code in
> netvsc_send(). The duplicate adjustment causes some pagebuf entries to
> not be mapped. In a normal VM, this doesn't break anything because the
> mapping doesn’t change the PFN. But in a Confidential VM,
> dma_map_single() does bounce buffering and provides a different PFN.
> Failing to do the mapping causes the wrong PFN to be passed to Hyper-V,
> and various errors ensue.
> 
> [...]

Here is the summary with links:
  - [net,1/1] hv_netvsc: Fix missed pagebuf entries in netvsc_dma_map/unmap()
    https://git.kernel.org/netdev/net/c/99f1c46011cc

You are awesome, thank you!
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