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Subject: Re: [PATCH net 1/1] hv_netvsc: Fix missed pagebuf entries in
 netvsc_dma_map/unmap()
From:   patchwork-bot+netdevbpf@kernel.org
Message-Id: <167532721756.2893.14755906003032321617.git-patchwork-notify@kernel.org>
Date:   Thu, 02 Feb 2023 08:40:17 +0000
References: <1675135986-254490-1-git-send-email-mikelley@microsoft.com>
In-Reply-To: <1675135986-254490-1-git-send-email-mikelley@microsoft.com>
To:     Michael Kelley (LINUX) <mikelley@microsoft.com>
Cc:     kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
        decui@microsoft.com, davem@davemloft.net, edumazet@google.com,
        kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org,
        linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org
Precedence: bulk

Hello:

This patch was applied to netdev/net.git (master)
by Paolo Abeni <pabeni@redhat.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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