https://github.com/torvalds/linux
Revision 99f1c46011cc0feb47d4f4f7bee70a0341442d14 authored by Michael Kelley on 31 January 2023, 03:33:06 UTC, committed by Paolo Abeni on 02 February 2023, 08:15:30 UTC
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 <mikelley@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Link: https://lore.kernel.org/r/1675135986-254490-1-git-send-email-mikelley@microsoft.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
1 parent 917d5e0
Tip revision: 99f1c46011cc0feb47d4f4f7bee70a0341442d14 authored by Michael Kelley on 31 January 2023, 03:33:06 UTC
hv_netvsc: Fix missed pagebuf entries in netvsc_dma_map/unmap()
hv_netvsc: Fix missed pagebuf entries in netvsc_dma_map/unmap()
Tip revision: 99f1c46
File | Mode | Size |
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LICENSES | ||
arch | ||
block | ||
certs | ||
crypto | ||
drivers | ||
fs | ||
include | ||
init | ||
io_uring | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
rust | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | -rw-r--r-- | 20.0 KB |
.cocciconfig | -rw-r--r-- | 59 bytes |
.get_maintainer.ignore | -rw-r--r-- | 151 bytes |
.gitattributes | -rw-r--r-- | 62 bytes |
.gitignore | -rw-r--r-- | 2.0 KB |
.mailmap | -rw-r--r-- | 24.8 KB |
.rustfmt.toml | -rw-r--r-- | 369 bytes |
COPYING | -rw-r--r-- | 496 bytes |
CREDITS | -rw-r--r-- | 99.5 KB |
Kbuild | -rw-r--r-- | 2.5 KB |
Kconfig | -rw-r--r-- | 555 bytes |
MAINTAINERS | -rw-r--r-- | 681.6 KB |
Makefile | -rw-r--r-- | 70.2 KB |
README | -rw-r--r-- | 727 bytes |
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