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KVM: Difference between revisions
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The [http://www.linux-kvm.org/page/Main_Page www.linux-kvm.org] page is really nice. The [http://calamari.reverse-dns.net:980/cgi-bin/moin.cgi/FrontPage qemu wiki] also regularly proves itself useful. | KVM, a drop-in qemu replacement engine making use of VT hardware, is in my mind the best of some [[4000 Linux VT Solutions]]. The [http://www.linux-kvm.org/page/Main_Page www.linux-kvm.org] page is really nice. The [http://calamari.reverse-dns.net:980/cgi-bin/moin.cgi/FrontPage qemu wiki] also regularly proves itself useful. | ||
==Mounting a QCOW2 image== | |||
* Verify qcow2 format: | |||
<pre>[schwarzgerat](130) $ file /media/vms/win10.img | |||
/media/vms/win10.img: QEMU QCOW2 Image (v3), 137438953472 bytes | |||
[schwarzgerat](0) $ </pre> | |||
* Connect it to a network block device: | |||
<pre>[schwarzgerat](1) $ sudo qemu-nbd --connect=/dev/nbd0 /media/vms/win10.img | |||
[schwarzgerat](0) $</pre> | |||
* Find the partition: | |||
<pre>[schwarzgerat](1) $ sudo gdisk /dev/nbd0 -l | |||
GPT fdisk (gdisk) version 1.0.9 | |||
The protective MBR's 0xEE partition is oversized! Auto-repairing. | |||
Partition table scan: | |||
MBR: protective | |||
BSD: not present | |||
APM: not present | |||
GPT: present | |||
Found valid GPT with protective MBR; using GPT. | |||
Disk /dev/nbd0: 268435456 sectors, 128.0 GiB | |||
Sector size (logical/physical): 512/512 bytes | |||
Disk identifier (GUID): DBEAA70E-0076-4A74-A7C4-D2F498223CD0 | |||
Partition table holds up to 128 entries | |||
Main partition table begins at sector 2 and ends at sector 33 | |||
First usable sector is 34, last usable sector is 125829086 | |||
Partitions will be aligned on 2048-sector boundaries | |||
Total free space is 6077 sectors (3.0 MiB) | |||
Number Start (sector) End (sector) Size Code Name | |||
1 2048 1023999 499.0 MiB 2700 Basic data partition | |||
2 1024000 1226751 99.0 MiB EF00 EFI system partition | |||
3 1226752 1259519 16.0 MiB 0C01 Microsoft reserved ... | |||
4 1259520 125825023 59.4 GiB 0700 Basic data partition | |||
[schwarzgerat](0) $</pre> | |||
* Mount it: <tt>sudo mount /dev/nbd0p4 /media/windows</tt> | |||
==Integration with virtio== | ==Integration with virtio== | ||
Latest revision as of 17:10, 5 September 2022
KVM, a drop-in qemu replacement engine making use of VT hardware, is in my mind the best of some 4000 Linux VT Solutions. The www.linux-kvm.org page is really nice. The qemu wiki also regularly proves itself useful.
Mounting a QCOW2 image
- Verify qcow2 format:
[schwarzgerat](130) $ file /media/vms/win10.img /media/vms/win10.img: QEMU QCOW2 Image (v3), 137438953472 bytes [schwarzgerat](0) $
- Connect it to a network block device:
[schwarzgerat](1) $ sudo qemu-nbd --connect=/dev/nbd0 /media/vms/win10.img [schwarzgerat](0) $
- Find the partition:
[schwarzgerat](1) $ sudo gdisk /dev/nbd0 -l GPT fdisk (gdisk) version 1.0.9 The protective MBR's 0xEE partition is oversized! Auto-repairing. Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Disk /dev/nbd0: 268435456 sectors, 128.0 GiB Sector size (logical/physical): 512/512 bytes Disk identifier (GUID): DBEAA70E-0076-4A74-A7C4-D2F498223CD0 Partition table holds up to 128 entries Main partition table begins at sector 2 and ends at sector 33 First usable sector is 34, last usable sector is 125829086 Partitions will be aligned on 2048-sector boundaries Total free space is 6077 sectors (3.0 MiB) Number Start (sector) End (sector) Size Code Name 1 2048 1023999 499.0 MiB 2700 Basic data partition 2 1024000 1226751 99.0 MiB EF00 EFI system partition 3 1226752 1259519 16.0 MiB 0C01 Microsoft reserved ... 4 1259520 125825023 59.4 GiB 0700 Basic data partition [schwarzgerat](0) $
- Mount it: sudo mount /dev/nbd0p4 /media/windows
Integration with virtio
Tmpfs issues
- See the info on hugetlbfs at Pages
