========================== Result with booting minimal linux disk image (linux-0.2.img) ========================== 1/ Boot the guest with kvm tool ########################################################################################################### kashyap@kvm$ ./kvm run -d /export/testimages-nlt/linux-0.2.img # kvm run -k ../../arch/x86/boot/bzImage -m 320 -c 2 --name guest-14306 PPrroobbiinngg EEDDDD ((eedddd==ooffff ttoo ddiissaabbllee))...... ookk Decompressing Linux... Parsing ELF... done. Booting the kernel. [ 0.000000] Linux version 3.0.0-rc5-sasha-00798-gd70c503 (kashyap@reacher.pnq.redhat.com) (gcc version 4.5.1 20100924 (Red Hat 4.5.1-4) (GCC) ) #1 SMP PREEMPT Sun Aug 14 14:03:58 IST 2011 [ 0.000000] Command line: notsc noapic noacpi pci=conf1 reboot=k panic=1 i8042.direct=1 i8042.dumbkbd=1 i8042.nopnp=1 console=ttyS0 earlyprintk=serial root=/dev/vda rw [ 0.000000] Disabled fast string operations [ 0.000000] BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) [ 0.000000] BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) [ 0.000000] BIOS-e820: 00000000000f0000 - 00000000000fffff (reserved) [ 0.000000] BIOS-e820: 0000000000100000 - 0000000014000000 (usable) [ 0.000000] bootconsole [earlyser0] enabled [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] DMI not present or invalid. [ 0.000000] No AGP bridge found [ 0.000000] last_pfn = 0x14000 max_arch_pfn = 0x400000000 [ 0.000000] x86 PAT enabled: cpu 0, old 0x0, new 0x7010600070106 [ 0.000000] CPU MTRRs all blank - virtualized system. [ 0.000000] found SMP MP-table at [ffff8800000f0300] f0300 [ 0.000000] init_memory_mapping: 0000000000000000-0000000014000000 [ 0.000000] ACPI Error: A valid RSDP was not found (20110413/tbxfroot-219) [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00 [ 0.000000] kvm-clock: cpu 0, msr 0:1c94a01, boot clock [ 0.000000] Zone PFN ranges: [ 0.000000] DMA 0x00000010 -> 0x00001000 [ 0.000000] DMA32 0x00001000 -> 0x00100000 [ 0.000000] Normal empty [ 0.000000] Movable zone start PFN for each node [ 0.000000] early_node_map[2] active PFN ranges [ 0.000000] 0: 0x00000010 -> 0x0000009f [ 0.000000] 0: 0x00000100 -> 0x00014000 [ 0.000000] SFI: Simple Firmware Interface v0.81 http://simplefirmware.org [ 0.000000] Intel MultiProcessor Specification v1.4 [ 0.000000] MPTABLE: OEM ID: KVMCPU00 [ 0.000000] MPTABLE: Product ID: 0.1 [ 0.000000] MPTABLE: APIC at: 0xFEE00000 [ 0.000000] Processor #0 (Bootup-CPU) [ 0.000000] Processor #1 [ 0.000000] IOAPIC[0]: apic_id 3, version 17, address 0xfec00000, GSI 0-23 [ 0.000000] Processors: 2 [ 0.000000] SMP: Allowing 2 CPUs, 0 hotplug CPUs [ 0.000000] PM: Registered nosave memory: 000000000009f000 - 00000000000a0000 [ 0.000000] PM: Registered nosave memory: 00000000000a0000 - 00000000000f0000 [ 0.000000] PM: Registered nosave memory: 00000000000f0000 - 00000000000ff000 [ 0.000000] PM: Registered nosave memory: 00000000000ff000 - 0000000000100000 [ 0.000000] Allocating PCI resources starting at 14000000 (gap: 14000000:ec000000) [ 0.000000] Booting paravirtualized kernel on KVM [ 0.000000] setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:2 nr_node_ids:1 [ 0.000000] PERCPU: Embedded 23 pages/cpu @ffff880013c00000 s71232 r0 d22976 u1048576 [ 0.000000] kvm-clock: cpu 0, msr 0:13c10a01, primary cpu clock [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 80682 [ 0.000000] Kernel command line: notsc noapic noacpi pci=conf1 reboot=k panic=1 i8042.direct=1 i8042.dumbkbd=1 i8042.nopnp=1 console=ttyS0 earlyprintk=serial root=/dev/vda rw [ 0.000000] notsc: Kernel compiled with CONFIG_X86_TSC, cannot disable TSC completely. [ 0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes) [ 0.000000] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes) [ 0.000000] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes) [ 0.000000] Checking aperture... [ 0.000000] No AGP bridge found [ 0.000000] Memory: 305816k/327680k available (6432k kernel code, 452k absent, 21412k reserved, 6378k data, 516k init) [ 0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.000000] Preemptible hierarchical RCU implementation. [ 0.000000] NR_IRQS:33024 nr_irqs:512 16 [ 0.000000] Console: colour *CGA 80x25 [ 0.000000] console [ttyS0] enabled, bootconsole disabled [ 0.000000] console [ttyS0] enabled, bootconsole disabled [ 0.000000] Detected 2394.110 MHz processor. [ 0.000999] Calibrating delay loop (skipped) preset value.. 4788.22 BogoMIPS (lpj=2394110) [ 0.002010] pid_max: default: 32768 minimum: 301 [ 0.003060] Security Framework initialized [ 0.004034] Mount-cache hash table entries: 256 [ 0.005434] Disabled fast string operations [ 0.006034] mce: CPU supports 32 MCE banks [ 0.022633] CPU0: Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz stepping 06 [ 0.126079] Performance Events: unsupported p6 CPU model 23 no PMU driver, software events only. [ 0.139007] Booting Node 0, Processors #1 Ok. [ 0.000999] Disabled fast string operations [ 0.158014] kvm-clock: cpu 1, msr 0:13d10a01, secondary cpu clock [ 0.158060] Brought up 2 CPUs [ 0.158063] Total of 2 processors activated (9576.44 BogoMIPS). [ 0.161081] x86 PAT enabled: cpu 0, old 0x70106, new 0x7010600070106 [ 0.163105] devtmpfs: initialized [ 0.170085] Time: 9:52:54 Date: 08/14/11 [ 0.170085] NET: Registered protocol family 16 [ 0.173069] PCI: Using configuration type 1 for base access [ 0.278070] bio: create slab at 0 [ 0.280051] ACPI: Interpreter disabled. [ 0.281090] vgaarb: loaded [ 0.282241] SCSI subsystem initialized [ 0.284978] usbcore: registered new interface driver usbfs [ 0.286063] usbcore: registered new interface driver hub [ 0.287060] usbcore: registered new device driver usb [ 0.291064] Advanced Linux Sound Architecture Driver Version 1.0.24. [ 0.293062] PCI: Probing PCI hardware [ 0.306046] Bluetooth: Core ver 2.16 [ 0.307047] NET: Registered protocol family 31 [ 0.307965] Bluetooth: HCI device and connection manager initialized [ 0.308974] Bluetooth: HCI socket layer initialized [ 0.309968] Bluetooth: L2CAP socket layer initialized [ 0.311975] Bluetooth: SCO socket layer initialized [ 0.315067] cfg80211: Calling CRDA to update world regulatory domain [ 0.316181] NetLabel: Initializing [ 0.316181] NetLabel: domain hash size = 128 [ 0.316964] NetLabel: protocols = UNLABELED CIPSOv4 [ 0.318997] NetLabel: unlabeled traffic allowed by default [ 0.319974] Switching to clocksource kvm-clock [ 0.327916] FS-Cache: Loaded [ 0.328509] Switched to NOHz mode on CPU #0 [ 0.328682] Switched to NOHz mode on CPU #1 [ 0.365085] pnp: PnP ACPI: disabled [ 0.472261] NET: Registered protocol family 2 [ 0.473279] IP route cache hash table entries: 4096 (order: 3, 32768 bytes) [ 0.475213] TCP established hash table entries: 16384 (order: 6, 262144 bytes) [ 0.476615] TCP bind hash table entries: 16384 (order: 6, 262144 bytes) [ 0.477929] TCP: Hash tables configured (established 16384 bind 16384) [ 0.479233] TCP reno registered [ 0.479790] UDP hash table entries: 256 (order: 1, 8192 bytes) [ 0.480893] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes) [ 0.482234] NET: Registered protocol family 1 [ 0.497135] RPC: Registered named UNIX socket transport module. [ 0.507542] RPC: Registered udp transport module. [ 0.508641] RPC: Registered tcp transport module. [ 0.509805] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 0.511484] kvm: no hardware support [ 0.538824] platform rtc_cmos: registered platform RTC device (no PNP device found) [ 0.610416] Machine check injector initialized [ 0.613981] microcode: CPU0 sig=0x10676, pf=0x1, revision=0x0 [ 0.615396] microcode: CPU1 sig=0x10676, pf=0x1, revision=0x0 [ 0.640086] microcode: Microcode Update Driver: v2.00 , Peter Oruba [ 0.651245] HugeTLB registered 2 MB page size, pre-allocated 0 pages [ 0.668587] VFS: Disk quotas dquot_6.5.2 [ 0.669692] Dquot-cache hash table entries: 512 (order 0, 4096 bytes) [ 0.689493] FS-Cache: Netfs 'cifs' registered for caching [ 0.712433] NTFS driver 2.1.30 [Flags: R/W]. [ 0.728742] fuse init (API version 7.16) [ 0.730357] Installing v9fs 9p2000 file system support [ 0.731530] msgmni has been set to 597 [ 0.750653] NET: Registered protocol family 38 [ 0.751914] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) [ 0.753366] io scheduler noop registered [ 0.754335] io scheduler deadline registered [ 0.778067] io scheduler cfq registered (default) [ 0.848466] pci_hotplug: PCI Hot Plug PCI Core version: 0.5 [ 0.851286] virtio-pci 0000:00:01.0: enabling device (0000 -> 0001) [ 0.852868] virtio-pci 0000:00:02.0: enabling device (0000 -> 0003) [ 0.939369] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled �[ 1.233256] serial8250: ttyS0 at I/O 0x3f8 (irq = 0) is a 16550A �[ 1.526254] serial8250: ttyS1 at I/O 0x2f8 (irq = 0) is a 16550A �[ 1.811221] serial8250: ttyS2 at I/O 0x3e8 (irq = 0) is a 16550A [ 1.838990] Non-volatile memory driver v1.3 [ 1.840123] Linux agpgart interface v0.103 [ 1.841268] [drm] Initialized drm 1.1.0 20060810 [ 1.842380] [drm] radeon defaulting to kernel modesetting. [ 1.843397] [drm] radeon kernel modesetting enabled. [ 2.490315] brd: module loaded [ 2.494332] loop: module loaded [ 2.496906] vda: [ 2.757061] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI [ 2.758322] e1000: Copyright (c) 1999-2006 Intel Corporation. [ 2.783288] e1000e: Intel(R) PRO/1000 Network Driver - 1.3.10-k2 [ 2.784393] e1000e: Copyright(c) 1999 - 2011 Intel Corporation. [ 2.810074] Intel(R) Gigabit Ethernet Network Driver - version 3.0.6-k2 [ 2.811293] Copyright (c) 2007-2011 Intel Corporation. [ 2.836792] Intel(R) Virtual Function Network Driver - version 1.0.8-k0 [ 2.838061] Copyright (c) 2009 - 2010 Intel Corporation. [ 2.862070] tun: Universal TUN/TAP device driver, 1.6 [ 2.862985] tun: (C) 1999-2004 Max Krasnyansky [ 2.885134] iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:d [ 2.886449] iwlagn: Copyright(c) 2003-2011 Intel Corporation [ 2.887886] iwl4965: Intel(R) Wireless WiFi 4965 driver for Linux, in-tree: [ 2.889209] iwl4965: Copyright(c) 2003-2011 Intel Corporation [ 2.913091] iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, in-tree:s [ 2.914742] iwl3945: Copyright(c) 2003-2011 Intel Corporation [ 2.936347] console [netcon0] enabled [ 2.937300] netconsole: network logging started [ 2.947356] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 2.960053] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 2.984520] uhci_hcd: USB Universal Host Controller Interface driver [ 3.004432] usbcore: registered new interface driver cdc_wdm [ 3.005633] Initializing USB Mass Storage driver... [ 3.028088] usbcore: registered new interface driver usb-storage [ 3.029432] USB Mass Storage support registered. [ 3.055510] usbcore: registered new interface driver libusual [ 3.056794] i8042: PNP detection disabled [ 3.101477] serio: i8042 KBD port at 0x60,0x64 irq 1 [ 3.108987] serio: i8042 AUX port at 0x60,0x64 irq 12 [ 3.168983] mousedev: PS/2 mouse device common for all mice [ 3.170447] input: AT Raw Set 2 keyboard as /devices/platform/i8042/serio0/input/input0 [ 3.175846] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0 [ 3.177347] rtc0: alarms up to one day, 114 bytes nvram [ 3.201061] i2c /dev entries driver [ 3.248052] Linux video capture interface: v2.00 [ 3.323074] coretemp coretemp.0: Adding Core 0 failed [ 3.326331] coretemp coretemp.0: Adding Core 1 failed [ 3.327327] Bluetooth: Virtual HCI driver ver 1.3 [ 3.362058] Bluetooth: HCI UART driver ver 2.2 [ 3.362847] Bluetooth: HCI H4 protocol initialized [ 3.363848] Bluetooth: HCI BCSP protocol initialized [ 3.364775] Bluetooth: HCILL protocol initialized [ 3.365656] Bluetooth: HCIATH3K protocol initialized [ 3.366583] Bluetooth: Generic Bluetooth USB driver ver 0.6 [ 3.382098] usbcore: registered new interface driver btusb [ 3.383160] Bluetooth: Generic Bluetooth SDIO driver ver 0.1 [ 3.409193] Bluetooth: Atheros AR30xx firmware driver ver 1.0 [ 3.432059] usbcore: registered new interface driver ath3k [ 3.433065] cpuidle: using governor ladder [ 3.433774] cpuidle: using governor menu [ 3.461047] sdhci: Secure Digital Host Controller Interface driver [ 3.462167] sdhci: Copyright(c) Pierre Ossman [ 3.509076] EFI Variables Facility v0.08 2004-May-17 [ 3.693145] usbcore: registered new interface driver usbhid [ 3.694183] usbhid: USB HID core driver sh-2.05b# ########################################################################################################### 2/ 'List' , 'Pause' and 'Resume' a guest ######################################## kashyap@kvm$ ./kvm list PID GUEST 14306 guest-14306 ######################################## kashyap@kvm$ ./kvm pause -n guest-14306 kashyap@kvm$ kashyap@kvm$ ./kvm resume -n guest-14306 kashyap@kvm$ ######################################## => Status on stdout when paused and resumed .. ######################################## . . [ 3.433065] cpuidle: using governor ladder [ 3.433774] cpuidle: using governor menu [ 3.461047] sdhci: Secure Digital Host Controller Interface driver [ 3.462167] sdhci: Copyright(c) Pierre Ossman [ 3.509076] EFI Variables Facility v0.08 2004-May-17 [ 3.693145] usbcore: registered new interface driver usbhid [ 3.694183] usbhid: USB HID core driver sh-2.05b# Info: Guest paused Info: Guest resumed ######################################## 3/ Version Info: ######################################## kashyap@kvm$ ./kvm version kvm tool 3.0.rc5.796.g687c27 kashyap@kvm$ ######################################## 4/ Debug info of a running guest: ######################################## kashyap@kvm$ ./kvm debug -n guest-14306 # # vCPU #0's dump: # Registers: ---------- rip: ffffffff810444cc rsp: ffffffff81c01f30 flags: 0000000000000246 rax: 0000000000000000 rbx: ffffffff81c7bf60 rcx: 0000000000000000 rdx: 0000000000000000 rsi: 0000000000000003 rdi: ffffffff81c00000 rbp: ffffffff81c00000 r8: 0000000000000000 r9: 0000000000000000 r10: 0000000000000000 r11: 0000000000010a80 r12: ffff880013fcda80 r13: ffffffffffffffff r14: 0000000000013b30 r15: 0000000000000000 cr0: 000000008005003b cr2: 000000000949c000 cr3: 0000000012877000 cr4: 00000000000006f0 cr8: 0000000000000000 Segment registers: ------------------ register selector base limit type p dpl db s l g avl cs 0010 0000000000000000 ffffffff 0b 1 0 0 1 1 1 0 ss 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 ds 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 es 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 fs 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 gs 0000 ffff880013c00000 ffffffff 00 0 0 0 0 0 0 0 tr 0040 ffff880013c0e640 00002087 0b 1 0 0 0 0 0 0 ldt 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 gdt ffff880013c04000 0000007f idt ffffffff81d0b000 00000fff APIC: ----- efer: 0000000000000d01 apic base: 00000000fee00900 nmi: enabled Interrupt bitmap: ----------------- 0000000000000000 0000000000000000 0000000000000000 0000000000000000 Code: ----- rip: [] Stack: ------ Page Tables: pte4: 0000000012879067 pte3: 0000000012863067 pte2: 0000000000000000 pte1: f0000000f0000000 # # vCPU #1's dump: # Registers: ---------- rip: ffffffff810444cc rsp: ffff88001387bf20 flags: 0000000000000246 rax: 0000000000000000 rbx: ffffffff81c7bf60 rcx: 0000000000000000 rdx: 0000000000000000 rsi: 0000000000000003 rdi: ffff88001387a000 rbp: ffff88001387a000 r8: 0000000000000000 r9: 0000000000000000 r10: 000000010004969d r11: 0000000000000040 r12: 0000000000000000 r13: 0000000000000000 r14: 0000000000000000 r15: 0000000000000000 cr0: 000000008005003b cr2: 00000000ffe76b20 cr3: 0000000012877000 cr4: 00000000000006e0 cr8: 0000000000000000 Segment registers: ------------------ register selector base limit type p dpl db s l g avl cs 0010 0000000000000000 ffffffff 0b 1 0 0 1 1 1 0 ss 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 ds 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 es 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 fs 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 gs 0000 ffff880013d00000 ffffffff 00 0 0 0 0 0 0 0 tr 0040 ffff880013d0e640 00002087 0b 1 0 0 0 0 0 0 ldt 0000 0000000000000000 ffffffff 00 0 0 0 0 0 0 0 gdt ffff880013d04000 0000007f idt ffffffff81d0b000 00000fff APIC: ----- efer: 0000000000000d01 apic base: 00000000fee00800 nmi: enabled Interrupt bitmap: ----------------- 0000000000000000 0000000000000000 0000000000000000 0000000000000000 Code: ----- rip: [] Stack: ------ Page Tables: pte4: 0000000012879067 pte3: 0000000012863067 pte2: 0000000000000000 pte1: f0000000f0000000 [ 315.941124] SysRq : Show Regs [ 315.941680] CPU 0 [ 315.942072] Pid: 0, comm: swapper Not tainted 3.0.0-rc5-sasha-00798-gd70c503 #1 [ 315.942072] RIP: 0010:[] [] native_safe_halt+0x2/0x3 [ 315.942072] RSP: 0000:ffffffff81c01f30 EFLAGS: 00000246 [ 315.942072] RAX: 0000000000000000 RBX: ffff880013c0d290 RCX: 0000000000000000 [ 315.942072] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffffff81c00000 [ 315.942072] RBP: ffffffff81c00000 R08: 0000000000000000 R09: 0000000000000000 [ 315.942072] R10: 0000000000000000 R11: 0000000000010a80 R12: ffffffff816449ce [ 315.942072] R13: ffff880013c0d290 R14: 0000000000000000 R15: 0000000100000296 [ 315.942072] FS: 0000000000000000(0000) GS:ffff880013c00000(0000) knlGS:0000000000000000 [ 315.942072] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 315.942072] CR2: 000000000949c000 CR3: 0000000012877000 CR4: 00000000000006f0 [ 315.942072] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 315.942072] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 315.942072] Process swapper (pid: 0, threadinfo ffffffff81c00000, task ffffffff81c0b020) [ 315.942072] Stack: [ 315.942072] ffffffff8102dbbf ffffffff81c7bf60 ffffffff81026232 0000000000000002 [ 315.942072] ffffffff81ccea00 ffffffff81cd0ac0 ffffffff81c96a24 0000000000000000 [ 315.942072] ffffffff81cd0ac0 ffffffff81c01fb8 0000000000000020 0000000000000000 [ 315.942072] Call Trace: [ 315.942072] [] ? default_idle+0x2f/0x56 [ 315.942072] [] ? cpu_idle+0x56/0x8c [ 315.942072] [] ? start_kernel+0x2cf/0x2da [ 315.942072] [] ? x86_64_start_kernel+0x102/0x10f [ 315.942072] Code: 8b 44 24 08 44 89 e1 89 ee 31 c0 e8 95 d2 5f 00 48 83 c4 18 89 d8 5b 5d 41 5c 41 5d c3 90 90 9c 58 c3 57 9d c3 fa c3 fb c3 fb f4 f4 c3 66 66 66 90 66 66 90 c3 66 66 66 90 66 66 90 c3 9c 58 [ 315.942072] Call Trace: [ 315.942072] [] ? default_idle+0x2f/0x56 [ 315.942072] [] ? cpu_idle+0x56/0x8c [ 315.942072] [] ? start_kernel+0x2cf/0x2da [ 315.942072] [] ? x86_64_start_kernel+0x102/0x10f sh-2.05b# ######################################## sh-2.05b# df -hT Filesystem Type Size Used Avail Use% Mounted on rootfs rootfs 20M 17M 1.7M 92% / /dev/root ext4 20M 17M 1.7M 92% / devtmpfs devtmpfs 150M 0 150M 0% /dev sh-2.05b# ######################################## ========================== Results with booting the decompressed QCOW2 disk image ========================== 1/ Booting the decompressed qcow2 image ################################################################################################# # ./kvm run -p "root=/dev/vda1" -d /export/test-images/debian_squeeze_i386_standard_decompressed.qcow2 . . . . . chgrp: changing group of `/var/log/dmesg': Read-only file system Starting enhanced syslogd: rsyslogdCan't open or create /var/run/rsyslogd.pid. Can't write pid. already started. acpid: can't open socket /var/run/acpid.socket: Read-only file system Starting ACPI services...RTNETLINK1 answers: No such file or directory acpid: error talking to the kernel via netlink Debian GNU/Linux 6.0 debian-i386 ttyS0 debian-i386 login: root Password: root@debian-i386:~# ls root@debian-i386:~# mkdir /export mkdir: cannot create directory `/export': Read-only file system root@debian-i386:~# touch foo.txt touch: cannot touch `foo.txt': Read-only file system root@debian-i386:~# df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/vda1 ext3 16G 775M 14G 6% / tmpfs tmpfs 215M 0 215M 0% /lib/init/rw udev tmpfs 10M 156K 9.9M 2% /dev tmpfs tmpfs 215M 0 215M 0% /dev/shm root@debian-i386:~# ################################################################################################# Note: Sasha Levin pointed out that currently QCOW images are Read-only -- https://github.com/penberg/linux-kvm/commit/f50152bf01581c7d8d11a9deabe7d33995a784a2