I have EPT enabled on L0, disabled on L1, and when attempted to boot
an L2 guest, it results in cursor just blinking on the serial console.
(All of them are Fedora 19 minimal guests.)
To be clear, by "disable" I mean, the below KVM parameter is N
$ cat /sys/module/kvm_intel/parameters/ept
N
I don't see any boot messages on serial console either. Running
$ virsh start nguest-01 --console
results in cursor just waiting there and hung.
I thought I'll see what's going on in L2 logs by mounting the disk
image read-only via guestfish
$ guestfish --ro -d nguest-01 -i
This is hung too.
NOTE: If I enable EPT in L1, I'm able to boot L2 guests just fine and
can see all the boot messages.
Any hints on what might be going on here?
Details about test environment below.
Setup info:
----------------
L0 (Intel Haswell):
- 4 pCPU 16G pMEM.
- Version (same for both L0 and L1):
$ uname -r; rpm -q qemu-kvm libvirt-daemon-kvm libguestfs
3.12.0-0.rc3.git1.2.fc21.x86_64
qemu-kvm-1.4.2-7.fc19.x86_64
libvirt-daemon-kvm-1.0.5.5-1.fc19.x86_64
libguestfs-1.22.5-1.fc19.x86_64
KVM Parameters in L0:
$ cat /sys/module/kvm_intel/parameters/nested
Y
$ cat /sys/module/kvm_intel/parameters/enable_shadow_vmcs
Y
$ cat /sys/module/kvm_intel/parameters/ept
Y
KVM Parameters in L1 (Note - EPT is disabled below):
$ cat /sys/module/kvm_intel/parameters/nested
Y
$ cat /sys/module/kvm_intel/parameters/enable_shadow_vmcs
N
$ cat /sys/module/kvm_intel/parameters/ept
N
L1 qemu-kvm command line:
----------------------------------------
$ ps -ef | grep qemu
qemu 4329 1 30 03:35 ? 00:13:47
/usr/bin/qemu-system-x86_64 -machine accel=kvm -name regular-guest -S
-machine pc-i440fx-1.4,accel=kvm,usb=off -cpu host -m 10240 -smp
4,sockets=4,cores=1,threads=1 -uuid
4ed9ac0b-7f72-dfcf-68b3-e6fe2ac588b2 -nographic -no-user-config
-nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/regular-guest.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc
-no-shutdown -boot c -usb -drive
file=/home/test/vmimages/regular-guest.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none
-device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0
-netdev tap,fd=23,id=hostnet0,vhost=on,vhostfd=24 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:80:c1:34,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
L2 qemu-kvm command line:
----------------------------------------
$ ps -ef | grep qemu
qemu 1174 1 99 04:13 ? 00:06:12
/usr/bin/qemu-system-x86_64 -machine accel=kvm -name nguest-01 -S
-machine pc-i440fx-1.4,accel=kvm,usb=off -m 2048 -smp
2,sockets=2,cores=1,threads=1 -uuid
b47c5cbb-b320-ce9d-c595-4e083b0e465d -nographic -no-user-config
-nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/nguest-01.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc
-no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2
-drive file=/home/test/vmimages/nguest-01.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none
-device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-netdev tap,fd=23,id=hostnet0,vhost=on,vhostfd=24 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:be:d5:8e,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
/kashyap
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