[Bug 1328973] Re: GSO segmentation in zero-copy mode is broken
Verified by both me and Victor Tapia (vtapia) - with 3.11.0-26.44~precise1 kernel the MS HCK Offload LSO test passes. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1328973 Title: GSO segmentation in zero-copy mode is broken To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1328973/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1330177] Re: [3.2] KVM: x86: emulate movdqa
Verified by both me and Victor Tapia (vtapia). ** Tags removed: verification-needed-precise ** Tags added: verification-done-precise -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1330177 Title: [3.2] KVM: x86: emulate movdqa To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1330177/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1330177] [NEW] [3.2] KVM: x86: emulate movdqa
Public bug reported: [SRU Justification] [Explanation] movdqa emulation is not supported in kernel 3.2, so it's relevant only for Precise 3.2 kernels. [Impact] Without movdqa emulation the MS SVVP "PCI Hardware Compliance Test for Systems" fails for Windows 2012 VM. This test fails and hangs the VM to the point that the VM becomes unusable. [Test Case] Windows 2012 Guest VMs running "PCI Hardware Compliance Test for Systems" SVVP test. ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1330177 Title: [3.2] KVM: x86: emulate movdqa To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1330177/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1328973] [NEW] GSO segmentation in zero-copy mode is broken
Public bug reported: [SRU Justification] [Setup] - 2 or more QEMU Guest VMs sharing the the same host - the Guests are communicating using virtio-net-pci devices - vhost-net is enabled [Explanation] If one Guest VM sends GSO packets to another while GRO is disabled for receiver, so these packets are segmented by net/core. In this case, if zero-copy is enabled in vhost-net, the GSO packets TX completion is reported to userspace as before the TX is actually done. The vhost-net's zero-copy mechanism is enabled by default since v3.8-rc1 (f9611c43). [Impact] Incorrect/junk data sent in case the transmitting Guest OS re-uses/frees the TX buffer immediately upon TX completion. [Test Case] Windows 2008R2 Guest VMs running MS HCK Offload LSO test. NOTE1: GRO is always disabled in this case because it's not supported by Windows Guest virtio-net-pci drivers. NOTE2: MS HCK re-uses the GSO (LSO) buffers, so it reproduces the issue every time. [Note] This bug has been fixed in v3.14-rc7 by 1fd819ec (https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=1fd819ecb90cc9b822cd84d3056ddba315d3340f). The fix actually disables zero copy for this case since it forces unconditional fragments copying, but it resolves the issue mentioned. ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1328973 Title: GSO segmentation in zero-copy mode is broken To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1328973/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
