From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B2D372C9C for ; Tue, 7 Feb 2023 13:05:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F3042C433EF; Tue, 7 Feb 2023 13:05:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1675775128; bh=5yAkyVE9BfCYKplOhkQm0g2qe6wzbyzACmGOsIhcEOA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TC/4MhQ72jIt8dNgNM4ZLO6dG7TfN+kKCEXP8KyfYVR5SChMKh1cQjxXBv43tCkOg klf8R95+vsqp4/ty7p7wXjBKx9hxqBcLAiqHLv25wDVvmYTxZFWJChfDM+iBRsCN60 bysZJ/B91rEvCnBL7ajchN/IUC9dKTUv2Ya4qN6I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michael Kelley , Haiyang Zhang , Paolo Abeni Subject: [PATCH 6.1 117/208] hv_netvsc: Fix missed pagebuf entries in netvsc_dma_map/unmap() Date: Tue, 7 Feb 2023 13:56:11 +0100 Message-Id: <20230207125639.694453814@linuxfoundation.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230207125634.292109991@linuxfoundation.org> References: <20230207125634.292109991@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Michael Kelley commit 99f1c46011cc0feb47d4f4f7bee70a0341442d14 upstream. 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. Fix this by removing the duplicate adjustment in netvsc_dma_map() and netvsc_dma_unmap(). Fixes: 846da38de0e8 ("net: netvsc: Add Isolation VM support for netvsc driver") Cc: stable@vger.kernel.org Signed-off-by: Michael Kelley Reviewed-by: Haiyang Zhang Link: https://lore.kernel.org/r/1675135986-254490-1-git-send-email-mikelley@microsoft.com Signed-off-by: Paolo Abeni Signed-off-by: Greg Kroah-Hartman --- drivers/net/hyperv/netvsc.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -987,9 +987,6 @@ static void netvsc_copy_to_send_buf(stru void netvsc_dma_unmap(struct hv_device *hv_dev, struct hv_netvsc_packet *packet) { - u32 page_count = packet->cp_partial ? - packet->page_buf_cnt - packet->rmsg_pgcnt : - packet->page_buf_cnt; int i; if (!hv_is_isolation_supported()) @@ -998,7 +995,7 @@ void netvsc_dma_unmap(struct hv_device * if (!packet->dma_range) return; - for (i = 0; i < page_count; i++) + for (i = 0; i < packet->page_buf_cnt; i++) dma_unmap_single(&hv_dev->device, packet->dma_range[i].dma, packet->dma_range[i].mapping_size, DMA_TO_DEVICE); @@ -1028,9 +1025,7 @@ static int netvsc_dma_map(struct hv_devi struct hv_netvsc_packet *packet, struct hv_page_buffer *pb) { - u32 page_count = packet->cp_partial ? - packet->page_buf_cnt - packet->rmsg_pgcnt : - packet->page_buf_cnt; + u32 page_count = packet->page_buf_cnt; dma_addr_t dma; int i;