Installation guide
flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush
dts acpi mmx fxsr sse sse2 ss ht tm syscall lm constant_tsc pni monitor
ds_cpl
vmx est tm2 cx16 xtpr lahf_lm
The following output contains an svm entry indicating an AMD processor with the AMD-V
extensions:
flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush
mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni cx16
lahf_lm cmp_legacy svm cr8legacy ts fid vid ttp tm stc
If any output is received, the processor has the hardware virtualization extensions. However
in some circumstances manufacturers disable the virtualization extensions in BIOS.
The "flags:" content may appear multiple times for each hyperthread, core or CPU on the
system.
The virtualization extensions may be disabled in the BIOS. If the extensions do not appear or
full virtualization does not work, see Procedure 36.1, “ Enabling virtualization extensions in
BIOS” .
3. Fo r u sers o f t h e KVM h yp erviso r
If the kvm package is installed. I As an additional check, verify that the kvm modules are
loaded in the kernel:
# lsmod | grep kvm
If the output includes kvm_intel or kvm_amd then the kvm hardware virtualization modules
are loaded and your system meets requirements. sudo
Note
If the libvirt package is installed, the virsh command can output a full list of virtualization
system capabilities. Run virsh capabilities as root to receive the complete list.
33.7. Accessing dat a from a guest disk image
There are various methods for accessing the data from guest image files. One common method is to
use the kpartx tool, covered by this section, to mount the guest file system as a loop device which
can then be accessed.
The kpartx command creates device maps from partition tables. Each guest storage image has a
partition table embedded in the file.
The libguestfs and guestfish packages, available from the EPEL repository, allow advanced
modification and access to guest file systems. The libguestfs and guestfish packages are not covered
in this section at this time.
Chapt er 33. T ips and t ricks
315