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Date: Tue, 26 Sep 2023 08:04:51 -0500 From: Michael Roth <michael.roth@....com> To: "Michael S. Tsirkin" <mst@...hat.com> CC: Linus Torvalds <torvalds@...ux-foundation.org>, <kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <eperezma@...hat.com>, <jasowang@...hat.com>, <shannon.nelson@....com>, <xuanzhuo@...ux.alibaba.com>, <yuanyaogoog@...omium.org>, <yuehaibing@...wei.com>, Thomas Lendacky <thomas.lendacky@....com> Subject: Re: [GIT PULL] virtio: features On Sun, Sep 03, 2023 at 06:13:38PM -0400, Michael S. Tsirkin wrote: > The following changes since commit 2dde18cd1d8fac735875f2e4987f11817cc0bc2c: > > Linux 6.5 (2023-08-27 14:49:51 -0700) > > are available in the Git repository at: > > https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git tags/for_linus > > for you to fetch changes up to 1acfe2c1225899eab5ab724c91b7e1eb2881b9ab: > > virtio_ring: fix avail_wrap_counter in virtqueue_add_packed (2023-09-03 18:10:24 -0400) > > ---------------------------------------------------------------- > virtio: features > > a small pull request this time around, mostly because the > vduse network got postponed to next relase so we can be sure > we got the security store right. > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com> > > ---------------------------------------------------------------- > Eugenio Pérez (4): > vdpa: add VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK flag > vdpa: accept VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK backend feature > vdpa: add get_backend_features vdpa operation > vdpa_sim: offer VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK > > Jason Wang (1): > virtio_vdpa: build affinity masks conditionally > > Xuan Zhuo (12): > virtio_ring: check use_dma_api before unmap desc for indirect > virtio_ring: put mapping error check in vring_map_one_sg > virtio_ring: introduce virtqueue_set_dma_premapped() > virtio_ring: support add premapped buf > virtio_ring: introduce virtqueue_dma_dev() > virtio_ring: skip unmap for premapped > virtio_ring: correct the expression of the description of virtqueue_resize() > virtio_ring: separate the logic of reset/enable from virtqueue_resize > virtio_ring: introduce virtqueue_reset() > virtio_ring: introduce dma map api for virtqueue > virtio_ring: introduce dma sync api for virtqueue > virtio_net: merge dma operations when filling mergeable buffers This ^ patch (upstream commit 295525e29a) seems to cause a network-related regression when using SWIOTLB in the guest. I noticed this initially testing SEV guests, which use SWIOTLB by default, but it can also be seen with normal guests when forcing SWIOTLB via swiotlb=force kernel cmdline option. I see it with both 6.6-rc1 and 6.6-rc2 (haven't tried rc3 yet, but don't see any related changes there), and reverting 714073495f seems to avoid the issue. Steps to reproduce: 1) Boot QEMU/KVM guest with 6.6-rc2 with swiotlb=force via something like the following cmdline: qemu-system-x86_64 \ -machine q35 -smp 4,maxcpus=255 -cpu EPYC-Milan-v2 \ -enable-kvm -m 16G,slots=5,maxmem=256G -vga none \ -device virtio-scsi-pci,id=scsi0,disable-legacy=on,iommu_platform=true \ -drive file=/home/mroth/storage/ubuntu-18.04-seves2.qcow2,if=none,id=drive0,snapshot=off \ -device scsi-hd,id=hd0,drive=drive0,bus=scsi0.0 \ -device virtio-net-pci,netdev=netdev0,id=net0,disable-legacy=on,iommu_platform=true,romfile= \ -netdev tap,script=/home/mroth/qemu-ifup,id=netdev0 \ -L /home/mroth/storage/AMDSEV2/snp-release-2023-09-23/usr/local/share/qemu \ -drive if=pflash,format=raw,unit=0,file=/home/mroth/storage/AMDSEV2/snp-release-2023-09-23/usr/local/share/qemu/OVMF_CODE.fd,readonly \ -drive if=pflash,format=raw,unit=1,file=/home/mroth/storage/AMDSEV2/snp-release-2023-09-23/usr/local/share/qemu/OVMF_VARS.fd \ -debugcon file:debug.log -global isa-debugcon.iobase=0x402 -msg timestamp=on \ -kernel /boot/vmlinuz-6.6.0-rc2-vanilla0+ \ -initrd /boot/initrd.img-6.6.0-rc2-vanilla0+ \ -append "root=UUID=d72a6d1c-06cf-4b79-af43-f1bac4f620f9 ro console=ttyS0,115200n8 earlyprintk=serial,ttyS0,115200 debug=1 sev=debug page_poison=0 spec_rstack_overflow=off swiotlb=force" 2) scp a small file from the host to the guest IP via its virtio-net device. Smaller file sizes succeed, but the larger the file the more likely it will fail. e.g.: mroth@...t:~$ dd if=/dev/zero of=test bs=1K count=19 19+0 records in 19+0 records out 19456 bytes (19 kB, 19 KiB) copied, 0.000940134 s, 20.7 MB/s mroth@...t:~$ scp test vm0: test 100% 19KB 10.1MB/s 00:00 mroth@...t:~$ dd if=/dev/zero of=test bs=1K count=20 20+0 records in 20+0 records out 20480 bytes (20 kB, 20 KiB) copied, 0.00093774 s, 21.8 MB/s mroth@...t:~$ scp test vm0: test 0% 0 0.0KB/s --:-- ETA client_loop: send disconnect: Broken pipe lost connection mroth@...t:~$ Thanks, Mike > > Yuan Yao (1): > virtio_ring: fix avail_wrap_counter in virtqueue_add_packed > > Yue Haibing (1): > vdpa/mlx5: Remove unused function declarations > > drivers/net/virtio_net.c | 230 ++++++++++++++++++--- > drivers/vdpa/mlx5/core/mlx5_vdpa.h | 3 - > drivers/vdpa/vdpa_sim/vdpa_sim.c | 8 + > drivers/vhost/vdpa.c | 15 +- > drivers/virtio/virtio_ring.c | 412 ++++++++++++++++++++++++++++++++----- > drivers/virtio/virtio_vdpa.c | 17 +- > include/linux/vdpa.h | 4 + > include/linux/virtio.h | 22 ++ > include/uapi/linux/vhost_types.h | 4 + > 9 files changed, 625 insertions(+), 90 deletions(-) >
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