Hide Forgot
Description of problem: Boot win2008r2 & win2012r2 guest with "-numa node", then Hotplug vCPU to guest via QMP. can not find hot-added cpus via Task Manager inside guest. Version-Release number of selected component (if applicable): qemu-kvm-rhev-2.1.2-6.el7.x86_64 3.10.0-196.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. /usr/libexec/qemu-kvm -name windows -m 4G -smp 1,cores=1,threads=1,sockets=64,maxcpus=240 -numa node .... 2. Hotplug vCPU to guest via QMP 3. check Task Manager inside guest Actual results: can not find Hot-added cpus Expected results: should find at least 8. Additional info: 1. As 968811 is fixed. so for RHEL7.1 guest didn't hit this issue. 2. QE tested qemu-kvm-1.5.3-60.el7.x86_64 and qemu-kvm-1.5.3-77.el7.x86_64, Both of them hit this issue. so it is not regression bug. 3. can find Hot-added CPUs in device management inside guest(no online). 4. As linux guest didn't hit this issue. only windows guest has this issue. so QE is not sure if it is a qemu-kvm's bug.
I've also reproduced it, hot-added CPUs are actually seen by guest in device manager but not onlined/used by it until reboot.
*** Bug 1188584 has been marked as a duplicate of this bug. ***
fixed upstream: v2.2.0-rc2-30-gdd0247e [dd0247e09a542d2a7ba6e390c70b5616edb9ec56] pc: acpi: mark all possible CPUs as enabled in SRAT
good job
Reproduce this bug using the following version: qemu-kvm-rhev-2.1.2-23.el7.x86_64 kernel-3.10.0-232.el7.x86_64 Test steps: 1. boot a win2012r2 guest with 1 vcpu /usr/libexec/qemu-kvm -name windows -m 4G -smp 1,cores=1,threads=1,sockets=64,maxcpus=240 -numa node .... 2. Hotplug vCPU to guest via QMP {"execute": "qmp_capabilities"} {"return": {}} { "execute": "cpu-add", "arguments": { "id": 1 }} {"return": {}} { "execute": "cpu-add", "arguments": { "id":2}} {"return": {}} { "execute": "cpu-add", "arguments": { "id":3}} {"return": {}} { "execute": "cpu-add", "arguments": { "id":4}} {"return": {}} { "execute": "cpu-add", "arguments": { "id":5}} {"return": {}} 3. check Task Manager inside guest Actual results: can not find Hot-added cpus.
Test this bug using the following version: qemu-kvm-rhev-2.2.0-8.el7.x86_64 kernel-3.10.0-232.el7.x86_64 Tested guest: win2012r2, win2008r2-64 Test steps: 1. boot a win2012r2/win2008r2-64 guest with 1 vcpu /usr/libexec/qemu-kvm -name windows -m 4G -smp 1,cores=1,threads=1,sockets=64,maxcpus=240 -numa node .... 2. Hotplug vCPU to guest via QMP {"execute": "qmp_capabilities"} {"return": {}} { "execute": "cpu-add", "arguments": { "id": 1 }} {"return": {}} { "execute": "cpu-add", "arguments": { "id": 2 }} {"return": {}} { "execute": "cpu-add", "arguments": { "id": 3 }} {"return": {}} { "execute": "cpu-add", "arguments": { "id": 4 }} {"return": {}} { "execute": "cpu-add", "arguments": { "id": 5 }} {"return": {}} 3. check Task Manager inside guest Actual results: can find 6 cpus in "Task Manager".
Based on Comment 9, set this bug to VERIFIED. Best regards, Huiqing
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-2546.html