[PATCH 1/2] Qemu: add a group kvm to access /dev/kvm eaiser

Michael Tremer michael.tremer at ipfire.org
Thu Jun 16 10:31:52 CEST 2016


On Fri, 2016-06-10 at 11:36 +0200, Jonatan Schlag wrote:
> As a normal user, it is not possible to use qemu with KVM. This is bad
> because it is better when it is possible to start the machine with a
> less privileged user. To achieve this a group KVM is created and the
> access to /dev/kvm is allowed for this group. So every user in this
> group can use qemu with KVM.
> This change is also useful for libvirt because the VMs can be started
> with user nobody and group kvm.
> 
> Signed-off-by: Jonatan Schlag <jonatan.schlag at ipfire.org>
> ---
>  config/qemu/65-kvm.rules       | 2 ++
>  config/rootfiles/packages/qemu | 1 +
>  lfs/qemu                       | 4 +++-
>  src/paks/qemu/install.sh       | 2 ++
>  4 files changed, 8 insertions(+), 1 deletion(-)
>  create mode 100644 config/qemu/65-kvm.rules
> 
> diff --git a/config/qemu/65-kvm.rules b/config/qemu/65-kvm.rules
> new file mode 100644
> index 0000000..569ded9
> --- /dev/null
> +++ b/config/qemu/65-kvm.rules
> @@ -0,0 +1,2 @@
> +KERNEL=="kvm", GROUP="kvm", MODE="0660"
> +KERNEL=="vhost-net", GROUP="kvm", MODE="0660", TAG+="uaccess",
> OPTIONS+="static_node=vhost-net"
> diff --git a/config/rootfiles/packages/qemu b/config/rootfiles/packages/qemu
> index 482087b..3b3f361 100644
> --- a/config/rootfiles/packages/qemu
> +++ b/config/rootfiles/packages/qemu
> @@ -1,3 +1,4 @@
> +lib/udev/rules.d/65-kvm.rules
>  usr/bin/qemu
>  usr/bin/qemu-arm
>  usr/bin/qemu-ga
> diff --git a/lfs/qemu b/lfs/qemu
> index 804ec26..c32953c 100644
> --- a/lfs/qemu
> +++ b/lfs/qemu
> @@ -33,7 +33,7 @@ DIR_APP    = $(DIR_SRC)/$(THISAPP)
>  TARGET     = $(DIR_INFO)/$(THISAPP)
>  SUP_ARCH   = i586 x86_64
>  PROG       = qemu
> -PAK_VER    = 18
> +PAK_VER    = 19
>  
>  DEPS       = "sdl spice"
>  
> @@ -95,6 +95,8 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
>  	paxctl -m -r /usr/bin/qemu-arm
>  	paxctl -m -r /usr/bin/qemu-i386
>  	paxctl -m -r /usr/bin/qemu-x86_64
> +	# install an udev script to set the permissions of /dev/kvm
> +	cp -avf $(DIR_SRC)/config/qemu/65-kvm.rules /lib/udev/rules.d/65-
> kvm.rules
>  
>  	@rm -rf $(DIR_APP)
>  	@$(POSTBUILD)
> diff --git a/src/paks/qemu/install.sh b/src/paks/qemu/install.sh
> index a9f7321..9afe7f9 100644
> --- a/src/paks/qemu/install.sh
> +++ b/src/paks/qemu/install.sh
> @@ -22,6 +22,8 @@
>  ############################################################################
>  #
>  . /opt/pakfire/lib/functions.sh
> +create the group kvm when they not exist

The line above should be a comment...

> +getent group kvm >/dev/null || groupadd kvm
>  extract_files
>  restore_backup ${NAME}
>  echo shm	/dev/shm	tmpfs	defaults,size=256M	0	
> 0 >> /etc/fstab
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