Hotadd pci devices - Revision history

Bsd: added categories

2015-05-31T14:19:18Z

added categories

← Older revision		Revision as of 10:19, 31 May 2015
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	[ 153.750637] sda: unknown partition table		[ 153.750637] sda: unknown partition table
	[ 153.759275] sd 2:0:0:0: [sda] Attached SCSI disk		[ 153.759275] sd 2:0:0:0: [sda] Attached SCSI disk

			[[Category:Docs]][[Category:HowTo]][[Category:Devices]]

Sunshout at 11:13, 10 January 2014

2014-01-10T11:13:44Z

← Older revision		Revision as of 07:13, 10 January 2014
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	(qemu) drive_add 0 file=/storage/10G.img,format=qcow2,id=drive-virtio-disk1,if=none		(qemu) drive_add 0 file=/storage/10G.img,format=qcow2,id=drive-virtio-disk1,if=none
	(qemu) device_add virtio-blk-pci,scsi=on,drive=drive-virtio-disk1		(qemu) device_add virtio-blk-pci,scsi=on,drive=drive-virtio-disk1

			* check attached PCI devices
			(qemu) info pci

	* notice		* notice

Sunshout at 11:12, 10 January 2014

2014-01-10T11:12:56Z

← Older revision		Revision as of 07:12, 10 January 2014
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	for m in acpiphp pci_hotplug; do sudo modprobe ${m}; done		for m in acpiphp pci_hotplug; do sudo modprobe ${m}; done

			== Use QEMU monitor to hot add device ==

			(qemu) drive_add 0 file=/storage/10G.img,format=qcow2,id=drive-virtio-disk1,if=none
			(qemu) device_add virtio-blk-pci,scsi=on,drive=drive-virtio-disk1

	* notice		* notice

Sunshout at 11:08, 10 January 2014

2014-01-10T11:08:34Z

← Older revision		Revision as of 07:08, 10 January 2014
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	for m in acpiphp pci_hotplug; do sudo modprobe ${m}; done		for m in acpiphp pci_hotplug; do sudo modprobe ${m}; done

			* notice
			** '''pci_add''' is old style, instead use '''device_add'''

	== Use QEMU monitor to hot add devices ==		== Use QEMU monitor to hot add devices ==

Scoof at 19:00, 21 June 2010

2010-06-21T19:00:49Z

← Older revision		Revision as of 15:00, 21 June 2010
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	=== Add a disk ===		=== Add a disk ===

			Hot-adding a disk means hot-adding a PCI device, so you need PCI hotplug support in the guest for this to work.

	The following command in the QEMU monitor will add a scsi disk to the guest:		The following command in the QEMU monitor will add a scsi disk to the guest:
	* '''pci_add auto storage file=/home/rharper/work/images/empty.img,if=scsi'''		* '''pci_add auto storage file=/home/rharper/work/images/empty.img,if=scsi'''

Avishay: Changed bus 0 to 'auto' in examples: 0 causes segfault (https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/419590)

2009-10-04T07:31:35Z

Changed bus 0 to 'auto' in examples: 0 causes segfault (https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/419590)

WikiSysop at 13:55, 4 February 2009

2009-02-04T13:55:59Z

New page

== Using PCI Hotplug Support ==
PCI Hotplug support is now available in kvm.git, here is how to use it.

== Install PCI Hotplug drivers in the guest (Linux) ==
I loaded the following modules to get pci hotplug working:
* acpiphp
* pci_hotplug

You can either add these to your distro's module list to load on boot, or run a command like this.

for m in acpiphp pci_hotplug; do sudo modprobe ${m}; done

== Use QEMU monitor to hot add devices ==

The QEMU monitor has a new command, '''pci_add''', which is used to hotadd the pci devices.

QEMU 0.9.1 monitor - type 'help' for more information
(qemu) help pci_add
pci_add bus nic|storage [[vlan=n][,macaddr=addr][,model=type]] [file=file][,if=type][,bus=nr]... -- hot-add PCI device

=== Add a NIC ===
The following command in the QEMU monitor hot-adds a nic to the guest.
* '''pci_add 0 nic model=e1000'''
You can replace '''model=e1000''' with either '''model=rtl8139''', '''model=virtio''', or '''model=ne2k_pci'''. Note that '''model=ne2000''' isn't pci-based but rather ISA-based and cannot be used for hotplug.

(qemu) pci_add 0 nic model=e1000 WARNING: PCI region size must be pow2 type=0x0, size=0x60000 OK bus 0, slot 5, function 0 (devfn 40)

In the guest we can check if the device was added by looking at dmesg.
[ 91.808265] acpiphp: Slot [30] registered
[ 91.808276] acpiphp: Slot [31] registered
[ 110.828130] PCI: Ignore bogus resource 6 [0:0] of 0000:00:02.0
[ 110.828333] decode_hpp: Could not get hotplug parameters. Use defaults
[ 110.903259] Intel(R) PRO/1000 Network Driver - version 7.3.20-k2-NAPI
[ 110.903264] Copyright (c) 1999-2006 Intel Corporation.
[ 110.903489] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 10
[ 110.903492] ACPI: PCI Interrupt 0000:00:05.0[A] -> Link [LNKA] -> GSI 10 (level, high) -> IRQ 10
[ 111.238713] e1000: 0000:00:05.0: e1000_probe: (PCI:33MHz:32-bit) 52:54:00:12:34:57
[ 111.292550] e1000: eth1: e1000_probe: Intel(R) PRO/1000 Network Connection

=== Add a disk ===
The following command in the QEMU monitor will add a scsi disk to the guest:
* '''pci_add 0 storage file=/home/rharper/work/images/empty.img,if=scsi'''
You can replace '''if=scsi''' with '''if=virtio''', but IDE is not hotpluggable.

QEMU 0.9.1 monitor - type 'help' for more information
(qemu) pci_add 0 storage file=/home/rharper/work/images/empty.img,if=scsi
OK bus 0, slot 5, function 0 (devfn 40)

In the guest we see via dmesg that the device was added.

[ 150.581752] PCI: Enabling device 0000:00:05.0 (0000 -> 0003)
[ 150.582634] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 10
[ 150.582637] ACPI: PCI Interrupt 0000:00:05.0[A] -> Link [LNKA] -> GSI 10 (level, high) -> IRQ 10
[ 150.585099] sym0: <895a> rev 0x0 at pci 0000:00:05.0 irq 10
[ 150.594628] sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
[ 150.607861] sym0: SCSI BUS has been reset.
[ 150.607883] scsi2 : sym-2.2.3
[ 153.608433] scsi 2:0:0:0: Direct-Access QEMU QEMU HARDDISK 0.9. PQ: 0 ANSI: 3
[ 153.608462] target2:0:0: tagged command queuingenabled, command queue depth 16.
[ 153.608484] target2:0:0: Beginning Domain Validation
[ 153.609517] target2:0:0: Domain Validation skipping write tests
[ 153.609522] target2:0:0: Ending Domain Validation
[ 153.618880] scsi 2:0:0:0: Attached scsi generic sg1 type 0
[ 153.749967] Driver 'sd' needs updating - please use bus_type methods
[ 153.750204] sd 2:0:0:0: [sda] 20971520 512-byte hardware sectors (10737 MB)
[ 153.750253] sd 2:0:0:0: [sda] Write Protect is off
[ 153.750255] sd 2:0:0:0: [sda] Mode Sense: 14 00 00 00
[ 153.750354] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 153.750478] sd 2:0:0:0: [sda] 20971520 512-byte hardware sectors (10737 MB)
[ 153.750253] sd 2:0:0:0: [sda] Write Protect is off
[ 153.750255] sd 2:0:0:0: [sda] Mode Sense: 14 00 00 00
[ 153.750354] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 153.750478] sd 2:0:0:0: [sda] 20971520 512-byte hardware sectors (10737 MB)
[ 153.750534] sd 2:0:0:0: [sda] Write Protect is off
[ 153.750536] sd 2:0:0:0: [sda] Mode Sense: 14 00 00 00
[ 153.750634] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 153.750637] sda: unknown partition table
[ 153.759275] sd 2:0:0:0: [sda] Attached SCSI disk

← Older revision		Revision as of 03:31, 4 October 2009
Line 23:		Line 23:
	=== Add a NIC ===		=== Add a NIC ===
	The following command in the QEMU monitor hot-adds a nic to the guest.		The following command in the QEMU monitor hot-adds a nic to the guest.
	* '''pci_add 0 nic model=e1000'''		* '''pci_add auto nic model=e1000'''
	You can replace '''model=e1000''' with either '''model=rtl8139''', '''model=virtio''', or '''model=ne2k_pci'''. Note that '''model=ne2000''' isn't pci-based but rather ISA-based and cannot be used for hotplug.		You can replace '''model=e1000''' with either '''model=rtl8139''', '''model=virtio''', or '''model=ne2k_pci'''. Note that '''model=ne2000''' isn't pci-based but rather ISA-based and cannot be used for hotplug.

	(qemu) pci_add 0 nic model=e1000 WARNING: PCI region size must be pow2 type=0x0, size=0x60000 OK bus 0, slot 5, function 0 (devfn 40)		(qemu) pci_add auto nic model=e1000 WARNING: PCI region size must be pow2 type=0x0, size=0x60000 OK bus 0, slot 5, function 0 (devfn 40)


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	=== Add a disk ===		=== Add a disk ===
	The following command in the QEMU monitor will add a scsi disk to the guest:		The following command in the QEMU monitor will add a scsi disk to the guest:
	* '''pci_add 0 storage file=/home/rharper/work/images/empty.img,if=scsi'''		* '''pci_add auto storage file=/home/rharper/work/images/empty.img,if=scsi'''
	You can replace '''if=scsi''' with '''if=virtio''', but IDE is not hotpluggable.		You can replace '''if=scsi''' with '''if=virtio''', but IDE is not hotpluggable.


	QEMU 0.9.1 monitor - type 'help' for more information		QEMU 0.9.1 monitor - type 'help' for more information
	(qemu) pci_add 0 storage file=/home/rharper/work/images/empty.img,if=scsi		(qemu) pci_add auto storage file=/home/rharper/work/images/empty.img,if=scsi
	OK bus 0, slot 5, function 0 (devfn 40)		OK bus 0, slot 5, function 0 (devfn 40)