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1608 discussions

Downgrading from Xen 4.6 to 4.5
by Francis Greaves 08 Aug '16

08 Aug '16

Dear All I have an up to date CentOS 7 with Xen 4.6 I have noticed in some posts here and there that PCI Passthrough is not working in 4.6 for some people, but is working in 4.5 How can I downgrade to Xen 4.5 so I can test this out? Many thanks Francis

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Centos 7 newer kernel needed
by Laurentiu Soica 05 Aug '16

05 Aug '16

Hello, I am looking for a Linux kernel for Centos 7 that implements a feature introduced in kernel version 3.12: "nested EPT support to KVM's nested VMX." If anyone has used this feature with Centos 7, please let me know. Laurentiu

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Lost a NIC on start
by Günther J. Niederwimmer 04 Aug '16

04 Aug '16

Hello, CentOS 7.2 I have a big Problem with libvirt or KVM, my Virtual Hosts lost sometime a NIC on start. I have configured 4 NIC on the Virtual host two passthru and 2 virtual, on start most time i lost a virtual NIC :-( So after a reboot I have to check always is all running and working.? with a "virsh reboot xxxx" in the most time it come back ? Have any a Idea why ? I found nothing in the Logs :-(. -- mit freundlichen Grüßen / best regards, Günther J. Niederwimmer

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Why does AWS instance always lost around 500MB memory
by Dũng Trần-Dương 02 Aug '16

02 Aug '16

Hi, I launched an AWS instance `t2.medium` (use CentOS 7 image "ami-7abd0209", product code: https://aws.amazon.com/marketplace/pp/B00O7WM7QW), which is supposed to have 4GB Memory in total, but turn out it is only "3.5GB". ``` $ free -h total used free shared buff/cache available Mem: 3.5G 441M 1.4G 16M 1.6G 2.7G Swap: 0B 0B 0B ``` It does not happen to AWS Ubuntu 16.04. ``` $ free -h total used free shared buff/cache available Mem: 3.9G 49M 3.3G 5.5M 518M 3.7G Swap: 0B 0B 0B ``` This seems to happen to all AWS CentOS image, regardless which instance type it is.

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Updated Xen packages available
by George Dunlap 26 Jul '16

26 Jul '16

Due to the nature of XSA-182, we built binaries privately and pushed the signed binaries out as soon as the embargo lifted. Everyone is urged to update as soon as possible. -George

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Cannot allocate Memory
by Shaun Reitan 25 Jul '16

25 Jul '16

Any of you guys ever seen an issue with Xen 4.4 were xm cannot create a guest because of what looks like an issue allocating memory even though xm info shows like 5x the amount of free memory needed? We are still unfortunately still using xm... it's on my list, i know.. We've had this happen on a couple hosts now. Only way to resolve seams to be rebooting the host. I'm going to update the host to latest Xen 4.4 now hoping this is a old bug. Here's from xen logs [2016-06-22 09:13:50 1958] DEBUG (XendDomainInfo:105) XendDomainInfo.create(['vm', ['name', 'xxx'], ['memory', 2048], ['on_xend_start', 'ignore'], ['on_xend_stop', 'ignore'], ['vcpus', 2], ['oos', 1], ['image', ['linux', ['kernel', '/kernels/vmlinux-2.6.18.8-4'], ['videoram', 4], ['args', 'root=/dev/xvda ro xencons=tty console=tty1 '], ['tsc_mode', 0], ['nomigrate', 0]]], ['s3_integrity', 1], ['device', ['vbd', ['uname', 'phy:vg/fs_6818'], ['dev', 'xvda'], ['mode', 'w']]], ['device', ['vbd', ['uname', 'phy:vg/fs_6819'], ['dev', 'xvdb'], ['mode', 'w']]], ['device', ['vif', ['rate', '40mb/s'], ['mac', 'FE:FD:48:01:F1:E7']]]]) [2016-06-22 09:13:50 1958] DEBUG (XendDomainInfo:2504) XendDomainInfo.constructDomain [2016-06-22 09:13:50 1958] DEBUG (balloon:187) Balloon: 7602632 KiB free; need 16384; done. [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:2566) (12, 'Cannot allocate memory') Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 2561, in _constructDomain target = self.info.target()) Error: (12, 'Cannot allocate memory') [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:490) VM start failed Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 475, in start XendTask.log_progress(0, 30, self._constructDomain) File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", line 209, in log_progress retval = func(*args, **kwds) File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 2572, in _constructDomain raise VmError(failmsg) VmError: Creating domain failed: name=xxx [2016-06-22 09:13:50 1958] ERROR (XendDomainInfo:110) Domain construction failed Traceback (most recent call last): File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 108, in create vm.start() File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 475, in start XendTask.log_progress(0, 30, self._constructDomain) File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", line 209, in log_progress retval = func(*args, **kwds) File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 2572, in _constructDomain raise VmError(failmsg) VmError: Creating domain failed: name=xxx -- Shaun

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oVirt 3.6.7 packages available for testing
by Rafael Martins 19 Jul '16

19 Jul '16

Hi, after some delay, the oVirt 3.6.7 packages are available for testing in Virt SIG. They are tagged virt7-ovirt-36-testing. Please help us testing this release and submitting feedback! Thanks, Rafael Martins

2 1

help
by zyy 13 Jul '16

13 Jul '16

在 2016-07-13三的 08:14 +0000，centos-virt-request(a)centos.xn--org:-7z8fk634a > Welcome to the CentOS-virt(a)centos.org mailing list! Welcome to the > CentOS virtualization list! > > To post to this list, send your email to: > > centos-virt(a)centos.org > > General information about the mailing list is at: > > https://lists.centos.org/mailman/listinfo/centos-virt > > If you ever want to unsubscribe or change your options (eg, switch to > or from digest mode, change your password, etc.), visit your > subscription page at: > > https://lists.centos.org/mailman/options/centos-virt/zuoyunyan%40re > dflag-linux.com > > > You can also make such adjustments via email by sending a message to: > > CentOS-virt-request(a)centos.org > > with the word `help' in the subject or body (don't include the > quotes), and you will get back a message with instructions. > > You must know your password to change your options (including > changing > the password, itself) or to unsubscribe. It is: > > zz5234380 > > Normally, Mailman will remind you of your centos.org mailing list > passwords once every month, although you can disable this if you > prefer. This reminder will also include instructions on how to > unsubscribe or change your account options. There is also a button > on > your options page that will email your current password to you.

1 0

Last Mesa with VirGL support
by Jean-Marc Liger 12 Jul '16

12 Jul '16

Hi, If you are interested in giving some testing, I've rebuilt from Fedora the last Mesa stack with VirGL 3D and others drivers enabled. https://copr.fedorainfracloud.org/coprs/jmliger/virt7-upstream/ Regards, Jean-Marc Liger

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qemu-kvm-ev-2.3.0-31.el7.16.1 available for testing
by Sandro Bonazzola 08 Jul '16

08 Jul '16

qemu-kvm-ev-2.3.0-31.el7.16.1 has been tagged for testing and should reach testing repositories soon. Please help testing and providing feedback, thanks. Changelog since previous release: * Fri Jul 08 2016 Sandro Bonazzola <sbonazzo(a)redhat.com> - ev-2.3.0-31.el7_2.16.1 - Removing RH branding from package name * Thu Jun 16 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.16 - kvm-vga-add-sr_vbe-register-set.patch [bz#1347185] - Resolves: bz#1347185 (Regression from CVE-2016-3712: windows installer fails to start) * Mon Jun 06 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.15 - kvm-qcow2-Prevent-backing-file-names-longer-than-1023.patch [bz#1340045] - Resolves: bz#1340045 (Throw error if qemu-img rebasing backing file is too long or provide way to fix a "too long" backing file.) * Mon May 16 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.14 - kvm-blockjob-Allow-nested-pause.patch [bz#1329543] - kvm-block-Pause-block-jobs-in-bdrv_drain_all.patch [bz#1329543] - kvm-qemu-iotests-Test-that-stop-doesn-t-drain-block-jobs.patch [bz#1329543] - kvm-blockjob-Update-function-name-in-comments.patch [bz#1329543] - kvm-virtio-blk-use-blk_io_plug-unplug-for-Linux-AIO-batc.patch [bz#1327613] - Resolves: bz#1327613 (AIO is processing only 1 request, even if >1 requests in virtio) - Resolves: bz#1329543 (live merge - qemu-kvm hangs in aio_bh_poll) * Tue May 03 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.13 - kvm-vga-fix-banked-access-bounds-checking-CVE-2016-3710.patch [bz#1331414] - kvm-vga-add-vbe_enabled-helper.patch [bz#1331414] - kvm-vga-factor-out-vga-register-setup.patch [bz#1331414] - kvm-vga-update-vga-register-setup-on-vbe-changes.patch [bz#1331414] - kvm-vga-make-sure-vga-register-setup-for-vbe-stays-intac.patch [bz#1331414] - Resolves: bz#1331414 (EMBARGOED CVE-2016-3710 qemu-kvm-rhev: qemu: incorrect banked access bounds checking in vga module [rhel-7.2.z]) * Thu Apr 14 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.12 - kvm-memory-exit-when-hugepage-allocation-fails-if-mem-pr.patch [bz#1324523] - Resolves: bz#1324523 (-mem-prealloc option does not take effect when no huge page is allocated) * Wed Apr 06 2016 Miroslav Rezanina <mrezanin(a)redhat.com> - rhev-2.3.0-31.el7_2.11 - kvm-exec-Stop-using-memory-after-free-BZ-1315195.patch [bz#1315195] - Resolves: bz#1315195 (qemu 2.1-2.4 crashes with segfault in phys_section_destroy) -- Sandro Bonazzola Better technology. Faster innovation. Powered by community collaboration. See how it works at redhat.com

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