Patchwork qemux86: Support for KVM, paravirt and virtio added

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Submitter Cristian Iorga
Date Sept. 17, 2012, 11:53 a.m.
Message ID <1347882817-3118-1-git-send-email-cristian.iorga@intel.com>
Download mbox | patch
Permalink /patch/36623/
State New
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Comments

Cristian Iorga - Sept. 17, 2012, 11:53 a.m.
KVM, paravirtualization and virtio drivers are now activated
in runqemu using the kvm option flag for qemux86.
Host CPU features are also exported to guest OS (Yocto Linux).
Usage example: runqemu qemux86 core-image-x11 kvm

Implements [YOCTO #2550].

Signed-off-by: Cristian Iorga <cristian.iorga@intel.com>
---
 meta/recipes-kernel/linux/linux-yocto_3.4.bb |    1 +
 scripts/runqemu                              |   16 +++++++++++++++-
 scripts/runqemu-internal                     |   14 +++++++++++---
 3 files changed, 27 insertions(+), 4 deletions(-)
Saul Wold - Sept. 18, 2012, 12:23 a.m.
On 09/17/2012 04:53 AM, Cristian Iorga wrote:
> KVM, paravirtualization and virtio drivers are now activated
> in runqemu using the kvm option flag for qemux86.
> Host CPU features are also exported to guest OS (Yocto Linux).
> Usage example: runqemu qemux86 core-image-x11 kvm
>
> Implements [YOCTO #2550].
>
> Signed-off-by: Cristian Iorga <cristian.iorga@intel.com>
> ---
>   meta/recipes-kernel/linux/linux-yocto_3.4.bb |    1 +
>   scripts/runqemu                              |   16 +++++++++++++++-
>   scripts/runqemu-internal                     |   14 +++++++++++---
>   3 files changed, 27 insertions(+), 4 deletions(-)
>
> diff --git a/meta/recipes-kernel/linux/linux-yocto_3.4.bb b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
> index 7c082e7..32ae02b 100644
> --- a/meta/recipes-kernel/linux/linux-yocto_3.4.bb
> +++ b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
> @@ -27,4 +27,5 @@ KERNEL_REVISION_CHECKING=""
>   KERNEL_FEATURES_append = " features/netfilter"
>   KERNEL_FEATURES_append_qemux86=" cfg/sound"
>   KERNEL_FEATURES_append_qemux86-64=" cfg/sound"
> +KERNEL_FEATURES_append_qemux86=" cfg/paravirt_kvm"

Good patch, with one question.

Can the be a valid KERNEL_FEATURE for x86-64 also? Any reason not to?

Sau!


>   KERNEL_FEATURES_append = " ${@bb.utils.contains("TUNE_FEATURES", "mx32", " cfg/x32", "" ,d)}"
> diff --git a/scripts/runqemu b/scripts/runqemu
> index e843946..167e157 100755
> --- a/scripts/runqemu
> +++ b/scripts/runqemu
> @@ -208,6 +208,7 @@ if [ -z "$MACHINE" ]; then
>   fi
>
>   YOCTO_KVM_WIKI="https://wiki.yoctoproject.org/wiki/How_to_enable_KVM_for_Poky_qemu"
> +YOCTO_PARAVIRT_KVM_WIKI="https://wiki.yoctoproject.org/wiki/Running_an_x86_Yocto_Linux_image_under_QEMU_KVM"
>   # Detect KVM configuration
>   if [ "x$KVM_ENABLED" = "xyes" ]; then
>       if [ -z "$KVM_CAPABLE" ]; then
> @@ -226,14 +227,27 @@ if [ "x$KVM_ENABLED" = "xyes" ]; then
>           echo "$YOCTO_KVM_WIKI";
>           exit 1;
>       fi
> +    if [ ! -e /dev/vhost-net ]; then
> +        echo "Missing virtio net device. Have you inserted vhost-net module?"
> +        echo "For further help see"
> +        echo "$YOCTO_PARAVIRT_KVM_WIKI";
> +        exit 1;
> +    fi
>       if 9<>/dev/kvm ; then
> -        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm"
> +        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm -cpu host"
> +        KVM_ACTIVE="yes"
>       else
>           echo "You have no rights on /dev/kvm."
>           echo "Please change the ownership of this file as described at"
>           echo "$YOCTO_KVM_WIKI";
>           exit 1;
>       fi
> +    if [ ! -w /dev/vhost-net -a -r /dev/vhost-net ]; then
> +        echo "You have no rights on /dev/vhost-net."
> +        echo "Please change the ownership of this file as described at"
> +        echo "$YOCTO_PARAVIRT_KVM_WIKI";
> +        exit 1;
> +    fi
>   fi
>
>   machine2=`echo $MACHINE | tr 'a-z' 'A-Z' | sed 's/-/_/'`
> diff --git a/scripts/runqemu-internal b/scripts/runqemu-internal
> index a9b1c44..f2c8d83 100755
> --- a/scripts/runqemu-internal
> +++ b/scripts/runqemu-internal
> @@ -221,7 +221,15 @@ n2=$(($n1 + 1))
>
>   KERNEL_NETWORK_CMD="ip=192.168.7.$n2::192.168.7.$n1:255.255.255.0"
>   QEMU_TAP_CMD="-net tap,vlan=0,ifname=$TAP,script=no,downscript=no"
> -QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
> +if [ "$KVM_ACTIVE" = "yes" ]; then
> +    QEMU_NETWORK_CMD="-net nic,model=virtio $QEMU_TAP_CMD,vhost=on"
> +    DROOT="/dev/vda"
> +    ROOTFS_OPTIONS="-drive file=$ROOTFS,if=virtio"
> +else
> +    QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
> +    DROOT="/dev/hda"
> +    ROOTFS_OPTIONS="-hda $ROOTFS"
> +fi
>   KERNCMDLINE="mem=$QEMU_MEMORY"
>   QEMU_UI_OPTIONS="-show-cursor -usb -usbdevice wacom-tablet"
>
> @@ -321,8 +329,8 @@ if [ "$MACHINE" = "qemux86" ]; then
>       QEMU=qemu-system-i386
>       QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware"
>       if [ "$FSTYPE" = "ext2" -o "$FSTYPE" = "ext3" -o "$FSTYPE" = "btrfs" ]; then
> -        KERNCMDLINE="vga=0 root=/dev/hda rw mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
> -        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
> +        KERNCMDLINE="vga=0 root=$DROOT rw mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
> +        QEMUOPTIONS="$QEMU_NETWORK_CMD $ROOTFS_OPTIONS $QEMU_UI_OPTIONS"
>       fi
>       if [ "$FSTYPE" = "nfs" ]; then
>           if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
>
Bruce Ashfield - Sept. 18, 2012, 4:23 a.m.
On Mon, Sep 17, 2012 at 8:23 PM, Saul Wold <sgw@linux.intel.com> wrote:
> On 09/17/2012 04:53 AM, Cristian Iorga wrote:
>>
>> KVM, paravirtualization and virtio drivers are now activated
>> in runqemu using the kvm option flag for qemux86.
>> Host CPU features are also exported to guest OS (Yocto Linux).
>> Usage example: runqemu qemux86 core-image-x11 kvm
>>
>> Implements [YOCTO #2550].
>>
>> Signed-off-by: Cristian Iorga <cristian.iorga@intel.com>
>> ---
>>   meta/recipes-kernel/linux/linux-yocto_3.4.bb |    1 +
>>   scripts/runqemu                              |   16 +++++++++++++++-
>>   scripts/runqemu-internal                     |   14 +++++++++++---
>>   3 files changed, 27 insertions(+), 4 deletions(-)
>>
>> diff --git a/meta/recipes-kernel/linux/linux-yocto_3.4.bb
>> b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
>> index 7c082e7..32ae02b 100644
>> --- a/meta/recipes-kernel/linux/linux-yocto_3.4.bb
>> +++ b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
>> @@ -27,4 +27,5 @@ KERNEL_REVISION_CHECKING=""
>>   KERNEL_FEATURES_append = " features/netfilter"
>>   KERNEL_FEATURES_append_qemux86=" cfg/sound"
>>   KERNEL_FEATURES_append_qemux86-64=" cfg/sound"
>> +KERNEL_FEATURES_append_qemux86=" cfg/paravirt_kvm"
>
>
> Good patch, with one question.
>
> Can the be a valid KERNEL_FEATURE for x86-64 also? Any reason not to?

It's also valid for x86_64. I'm going to be travelling for the next
day or so, but
if such a patch is done, I wouldn't object.

Bruce

>
> Sau!
>
>
>
>>   KERNEL_FEATURES_append = " ${@bb.utils.contains("TUNE_FEATURES", "mx32",
>> " cfg/x32", "" ,d)}"
>> diff --git a/scripts/runqemu b/scripts/runqemu
>> index e843946..167e157 100755
>> --- a/scripts/runqemu
>> +++ b/scripts/runqemu
>> @@ -208,6 +208,7 @@ if [ -z "$MACHINE" ]; then
>>   fi
>>
>>
>> YOCTO_KVM_WIKI="https://wiki.yoctoproject.org/wiki/How_to_enable_KVM_for_Poky_qemu"
>>
>> +YOCTO_PARAVIRT_KVM_WIKI="https://wiki.yoctoproject.org/wiki/Running_an_x86_Yocto_Linux_image_under_QEMU_KVM"
>>   # Detect KVM configuration
>>   if [ "x$KVM_ENABLED" = "xyes" ]; then
>>       if [ -z "$KVM_CAPABLE" ]; then
>> @@ -226,14 +227,27 @@ if [ "x$KVM_ENABLED" = "xyes" ]; then
>>           echo "$YOCTO_KVM_WIKI";
>>           exit 1;
>>       fi
>> +    if [ ! -e /dev/vhost-net ]; then
>> +        echo "Missing virtio net device. Have you inserted vhost-net
>> module?"
>> +        echo "For further help see"
>> +        echo "$YOCTO_PARAVIRT_KVM_WIKI";
>> +        exit 1;
>> +    fi
>>       if 9<>/dev/kvm ; then
>> -        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm"
>> +        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm -cpu host"
>> +        KVM_ACTIVE="yes"
>>       else
>>           echo "You have no rights on /dev/kvm."
>>           echo "Please change the ownership of this file as described at"
>>           echo "$YOCTO_KVM_WIKI";
>>           exit 1;
>>       fi
>> +    if [ ! -w /dev/vhost-net -a -r /dev/vhost-net ]; then
>> +        echo "You have no rights on /dev/vhost-net."
>> +        echo "Please change the ownership of this file as described at"
>> +        echo "$YOCTO_PARAVIRT_KVM_WIKI";
>> +        exit 1;
>> +    fi
>>   fi
>>
>>   machine2=`echo $MACHINE | tr 'a-z' 'A-Z' | sed 's/-/_/'`
>> diff --git a/scripts/runqemu-internal b/scripts/runqemu-internal
>> index a9b1c44..f2c8d83 100755
>> --- a/scripts/runqemu-internal
>> +++ b/scripts/runqemu-internal
>> @@ -221,7 +221,15 @@ n2=$(($n1 + 1))
>>
>>   KERNEL_NETWORK_CMD="ip=192.168.7.$n2::192.168.7.$n1:255.255.255.0"
>>   QEMU_TAP_CMD="-net tap,vlan=0,ifname=$TAP,script=no,downscript=no"
>> -QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
>> +if [ "$KVM_ACTIVE" = "yes" ]; then
>> +    QEMU_NETWORK_CMD="-net nic,model=virtio $QEMU_TAP_CMD,vhost=on"
>> +    DROOT="/dev/vda"
>> +    ROOTFS_OPTIONS="-drive file=$ROOTFS,if=virtio"
>> +else
>> +    QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
>> +    DROOT="/dev/hda"
>> +    ROOTFS_OPTIONS="-hda $ROOTFS"
>> +fi
>>   KERNCMDLINE="mem=$QEMU_MEMORY"
>>   QEMU_UI_OPTIONS="-show-cursor -usb -usbdevice wacom-tablet"
>>
>> @@ -321,8 +329,8 @@ if [ "$MACHINE" = "qemux86" ]; then
>>       QEMU=qemu-system-i386
>>       QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware"
>>       if [ "$FSTYPE" = "ext2" -o "$FSTYPE" = "ext3" -o "$FSTYPE" = "btrfs"
>> ]; then
>> -        KERNCMDLINE="vga=0 root=/dev/hda rw mem=$QEMU_MEMORY
>> $KERNEL_NETWORK_CMD"
>> -        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
>> +        KERNCMDLINE="vga=0 root=$DROOT rw mem=$QEMU_MEMORY
>> $KERNEL_NETWORK_CMD"
>> +        QEMUOPTIONS="$QEMU_NETWORK_CMD $ROOTFS_OPTIONS $QEMU_UI_OPTIONS"
>>       fi
>>       if [ "$FSTYPE" = "nfs" ]; then
>>           if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
>>
>
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
Cristian Iorga - Sept. 18, 2012, 6:18 a.m.
Hello Saul,

Thanks.

Good question. :-)
I think it's a definitely yes.
Although I need to check :-)
However, in the case of x86-64, there will be a small limitation.
The guest OS can be used only on a x86-64 machine (and I am guessing, also with a 64 bits enabled OS).

Regards,
Cristian


-----Original Message-----
From: Saul Wold [mailto:sgw@linux.intel.com] 
Sent: Tuesday, September 18, 2012 3:24 AM
To: Iorga, Cristian
Cc: 'Patches and discussions about the oe-core layer'
Subject: Re: [OE-core] [PATCH] qemux86: Support for KVM, paravirt and virtio added

On 09/17/2012 04:53 AM, Cristian Iorga wrote:
> KVM, paravirtualization and virtio drivers are now activated in 
> runqemu using the kvm option flag for qemux86.
> Host CPU features are also exported to guest OS (Yocto Linux).
> Usage example: runqemu qemux86 core-image-x11 kvm
>
> Implements [YOCTO #2550].
>
> Signed-off-by: Cristian Iorga <cristian.iorga@intel.com>
> ---
>   meta/recipes-kernel/linux/linux-yocto_3.4.bb |    1 +
>   scripts/runqemu                              |   16 +++++++++++++++-
>   scripts/runqemu-internal                     |   14 +++++++++++---
>   3 files changed, 27 insertions(+), 4 deletions(-)
>
> diff --git a/meta/recipes-kernel/linux/linux-yocto_3.4.bb 
> b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
> index 7c082e7..32ae02b 100644
> --- a/meta/recipes-kernel/linux/linux-yocto_3.4.bb
> +++ b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
> @@ -27,4 +27,5 @@ KERNEL_REVISION_CHECKING=""
>   KERNEL_FEATURES_append = " features/netfilter"
>   KERNEL_FEATURES_append_qemux86=" cfg/sound"
>   KERNEL_FEATURES_append_qemux86-64=" cfg/sound"
> +KERNEL_FEATURES_append_qemux86=" cfg/paravirt_kvm"

Good patch, with one question.

Can the be a valid KERNEL_FEATURE for x86-64 also? Any reason not to?

Sau!


>   KERNEL_FEATURES_append = " ${@bb.utils.contains("TUNE_FEATURES", "mx32", " cfg/x32", "" ,d)}"
> diff --git a/scripts/runqemu b/scripts/runqemu index e843946..167e157 
> 100755
> --- a/scripts/runqemu
> +++ b/scripts/runqemu
> @@ -208,6 +208,7 @@ if [ -z "$MACHINE" ]; then
>   fi
>
>   YOCTO_KVM_WIKI="https://wiki.yoctoproject.org/wiki/How_to_enable_KVM_for_Poky_qemu"
> +YOCTO_PARAVIRT_KVM_WIKI="https://wiki.yoctoproject.org/wiki/Running_an_x86_Yocto_Linux_image_under_QEMU_KVM"
>   # Detect KVM configuration
>   if [ "x$KVM_ENABLED" = "xyes" ]; then
>       if [ -z "$KVM_CAPABLE" ]; then
> @@ -226,14 +227,27 @@ if [ "x$KVM_ENABLED" = "xyes" ]; then
>           echo "$YOCTO_KVM_WIKI";
>           exit 1;
>       fi
> +    if [ ! -e /dev/vhost-net ]; then
> +        echo "Missing virtio net device. Have you inserted vhost-net module?"
> +        echo "For further help see"
> +        echo "$YOCTO_PARAVIRT_KVM_WIKI";
> +        exit 1;
> +    fi
>       if 9<>/dev/kvm ; then
> -        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm"
> +        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm -cpu host"
> +        KVM_ACTIVE="yes"
>       else
>           echo "You have no rights on /dev/kvm."
>           echo "Please change the ownership of this file as described at"
>           echo "$YOCTO_KVM_WIKI";
>           exit 1;
>       fi
> +    if [ ! -w /dev/vhost-net -a -r /dev/vhost-net ]; then
> +        echo "You have no rights on /dev/vhost-net."
> +        echo "Please change the ownership of this file as described at"
> +        echo "$YOCTO_PARAVIRT_KVM_WIKI";
> +        exit 1;
> +    fi
>   fi
>
>   machine2=`echo $MACHINE | tr 'a-z' 'A-Z' | sed 's/-/_/'` diff --git 
> a/scripts/runqemu-internal b/scripts/runqemu-internal index 
> a9b1c44..f2c8d83 100755
> --- a/scripts/runqemu-internal
> +++ b/scripts/runqemu-internal
> @@ -221,7 +221,15 @@ n2=$(($n1 + 1))
>
>   KERNEL_NETWORK_CMD="ip=192.168.7.$n2::192.168.7.$n1:255.255.255.0"
>   QEMU_TAP_CMD="-net tap,vlan=0,ifname=$TAP,script=no,downscript=no"
> -QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
> +if [ "$KVM_ACTIVE" = "yes" ]; then
> +    QEMU_NETWORK_CMD="-net nic,model=virtio $QEMU_TAP_CMD,vhost=on"
> +    DROOT="/dev/vda"
> +    ROOTFS_OPTIONS="-drive file=$ROOTFS,if=virtio"
> +else
> +    QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
> +    DROOT="/dev/hda"
> +    ROOTFS_OPTIONS="-hda $ROOTFS"
> +fi
>   KERNCMDLINE="mem=$QEMU_MEMORY"
>   QEMU_UI_OPTIONS="-show-cursor -usb -usbdevice wacom-tablet"
>
> @@ -321,8 +329,8 @@ if [ "$MACHINE" = "qemux86" ]; then
>       QEMU=qemu-system-i386
>       QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware"
>       if [ "$FSTYPE" = "ext2" -o "$FSTYPE" = "ext3" -o "$FSTYPE" = "btrfs" ]; then
> -        KERNCMDLINE="vga=0 root=/dev/hda rw mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
> -        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
> +        KERNCMDLINE="vga=0 root=$DROOT rw mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
> +        QEMUOPTIONS="$QEMU_NETWORK_CMD $ROOTFS_OPTIONS $QEMU_UI_OPTIONS"
>       fi
>       if [ "$FSTYPE" = "nfs" ]; then
>           if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; 
> then
>
Cristian Iorga - Sept. 18, 2012, 6:19 a.m.
OK, I will take care of that, if everyone agrees.

Regards,
Cristian

-----Original Message-----
From: Bruce Ashfield [mailto:bruce.ashfield@gmail.com] 
Sent: Tuesday, September 18, 2012 7:24 AM
To: Saul Wold
Cc: Iorga, Cristian; Patches and discussions about the oe-core layer
Subject: Re: [OE-core] [PATCH] qemux86: Support for KVM, paravirt and virtio added

On Mon, Sep 17, 2012 at 8:23 PM, Saul Wold <sgw@linux.intel.com> wrote:
> On 09/17/2012 04:53 AM, Cristian Iorga wrote:
>>
>> KVM, paravirtualization and virtio drivers are now activated in 
>> runqemu using the kvm option flag for qemux86.
>> Host CPU features are also exported to guest OS (Yocto Linux).
>> Usage example: runqemu qemux86 core-image-x11 kvm
>>
>> Implements [YOCTO #2550].
>>
>> Signed-off-by: Cristian Iorga <cristian.iorga@intel.com>
>> ---
>>   meta/recipes-kernel/linux/linux-yocto_3.4.bb |    1 +
>>   scripts/runqemu                              |   16 +++++++++++++++-
>>   scripts/runqemu-internal                     |   14 +++++++++++---
>>   3 files changed, 27 insertions(+), 4 deletions(-)
>>
>> diff --git a/meta/recipes-kernel/linux/linux-yocto_3.4.bb
>> b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
>> index 7c082e7..32ae02b 100644
>> --- a/meta/recipes-kernel/linux/linux-yocto_3.4.bb
>> +++ b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
>> @@ -27,4 +27,5 @@ KERNEL_REVISION_CHECKING=""
>>   KERNEL_FEATURES_append = " features/netfilter"
>>   KERNEL_FEATURES_append_qemux86=" cfg/sound"
>>   KERNEL_FEATURES_append_qemux86-64=" cfg/sound"
>> +KERNEL_FEATURES_append_qemux86=" cfg/paravirt_kvm"
>
>
> Good patch, with one question.
>
> Can the be a valid KERNEL_FEATURE for x86-64 also? Any reason not to?

It's also valid for x86_64. I'm going to be travelling for the next day or so, but if such a patch is done, I wouldn't object.

Bruce

>
> Sau!
>
>
>
>>   KERNEL_FEATURES_append = " ${@bb.utils.contains("TUNE_FEATURES", 
>> "mx32", " cfg/x32", "" ,d)}"
>> diff --git a/scripts/runqemu b/scripts/runqemu index e843946..167e157 
>> 100755
>> --- a/scripts/runqemu
>> +++ b/scripts/runqemu
>> @@ -208,6 +208,7 @@ if [ -z "$MACHINE" ]; then
>>   fi
>>
>>
>> YOCTO_KVM_WIKI="https://wiki.yoctoproject.org/wiki/How_to_enable_KVM_for_Poky_qemu"
>>
>> +YOCTO_PARAVIRT_KVM_WIKI="https://wiki.yoctoproject.org/wiki/Running_an_x86_Yocto_Linux_image_under_QEMU_KVM"
>>   # Detect KVM configuration
>>   if [ "x$KVM_ENABLED" = "xyes" ]; then
>>       if [ -z "$KVM_CAPABLE" ]; then
>> @@ -226,14 +227,27 @@ if [ "x$KVM_ENABLED" = "xyes" ]; then
>>           echo "$YOCTO_KVM_WIKI";
>>           exit 1;
>>       fi
>> +    if [ ! -e /dev/vhost-net ]; then
>> +        echo "Missing virtio net device. Have you inserted vhost-net
>> module?"
>> +        echo "For further help see"
>> +        echo "$YOCTO_PARAVIRT_KVM_WIKI";
>> +        exit 1;
>> +    fi
>>       if 9<>/dev/kvm ; then
>> -        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm"
>> +        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm -cpu host"
>> +        KVM_ACTIVE="yes"
>>       else
>>           echo "You have no rights on /dev/kvm."
>>           echo "Please change the ownership of this file as described at"
>>           echo "$YOCTO_KVM_WIKI";
>>           exit 1;
>>       fi
>> +    if [ ! -w /dev/vhost-net -a -r /dev/vhost-net ]; then
>> +        echo "You have no rights on /dev/vhost-net."
>> +        echo "Please change the ownership of this file as described at"
>> +        echo "$YOCTO_PARAVIRT_KVM_WIKI";
>> +        exit 1;
>> +    fi
>>   fi
>>
>>   machine2=`echo $MACHINE | tr 'a-z' 'A-Z' | sed 's/-/_/'` diff --git 
>> a/scripts/runqemu-internal b/scripts/runqemu-internal index 
>> a9b1c44..f2c8d83 100755
>> --- a/scripts/runqemu-internal
>> +++ b/scripts/runqemu-internal
>> @@ -221,7 +221,15 @@ n2=$(($n1 + 1))
>>
>>   KERNEL_NETWORK_CMD="ip=192.168.7.$n2::192.168.7.$n1:255.255.255.0"
>>   QEMU_TAP_CMD="-net tap,vlan=0,ifname=$TAP,script=no,downscript=no"
>> -QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
>> +if [ "$KVM_ACTIVE" = "yes" ]; then
>> +    QEMU_NETWORK_CMD="-net nic,model=virtio $QEMU_TAP_CMD,vhost=on"
>> +    DROOT="/dev/vda"
>> +    ROOTFS_OPTIONS="-drive file=$ROOTFS,if=virtio"
>> +else
>> +    QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
>> +    DROOT="/dev/hda"
>> +    ROOTFS_OPTIONS="-hda $ROOTFS"
>> +fi
>>   KERNCMDLINE="mem=$QEMU_MEMORY"
>>   QEMU_UI_OPTIONS="-show-cursor -usb -usbdevice wacom-tablet"
>>
>> @@ -321,8 +329,8 @@ if [ "$MACHINE" = "qemux86" ]; then
>>       QEMU=qemu-system-i386
>>       QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware"
>>       if [ "$FSTYPE" = "ext2" -o "$FSTYPE" = "ext3" -o "$FSTYPE" = "btrfs"
>> ]; then
>> -        KERNCMDLINE="vga=0 root=/dev/hda rw mem=$QEMU_MEMORY
>> $KERNEL_NETWORK_CMD"
>> -        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
>> +        KERNCMDLINE="vga=0 root=$DROOT rw mem=$QEMU_MEMORY
>> $KERNEL_NETWORK_CMD"
>> +        QEMUOPTIONS="$QEMU_NETWORK_CMD $ROOTFS_OPTIONS $QEMU_UI_OPTIONS"
>>       fi
>>       if [ "$FSTYPE" = "nfs" ]; then
>>           if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; 
>> then
>>
>
> _______________________________________________
> Openembedded-core mailing list
> Openembedded-core@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core



--
"Thou shalt not follow the NULL pointer, for chaos and madness await thee at its end"

Patch

diff --git a/meta/recipes-kernel/linux/linux-yocto_3.4.bb b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
index 7c082e7..32ae02b 100644
--- a/meta/recipes-kernel/linux/linux-yocto_3.4.bb
+++ b/meta/recipes-kernel/linux/linux-yocto_3.4.bb
@@ -27,4 +27,5 @@  KERNEL_REVISION_CHECKING=""
 KERNEL_FEATURES_append = " features/netfilter"
 KERNEL_FEATURES_append_qemux86=" cfg/sound"
 KERNEL_FEATURES_append_qemux86-64=" cfg/sound"
+KERNEL_FEATURES_append_qemux86=" cfg/paravirt_kvm"
 KERNEL_FEATURES_append = " ${@bb.utils.contains("TUNE_FEATURES", "mx32", " cfg/x32", "" ,d)}"
diff --git a/scripts/runqemu b/scripts/runqemu
index e843946..167e157 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -208,6 +208,7 @@  if [ -z "$MACHINE" ]; then
 fi
 
 YOCTO_KVM_WIKI="https://wiki.yoctoproject.org/wiki/How_to_enable_KVM_for_Poky_qemu"
+YOCTO_PARAVIRT_KVM_WIKI="https://wiki.yoctoproject.org/wiki/Running_an_x86_Yocto_Linux_image_under_QEMU_KVM"
 # Detect KVM configuration
 if [ "x$KVM_ENABLED" = "xyes" ]; then
     if [ -z "$KVM_CAPABLE" ]; then
@@ -226,14 +227,27 @@  if [ "x$KVM_ENABLED" = "xyes" ]; then
         echo "$YOCTO_KVM_WIKI";
         exit 1;
     fi
+    if [ ! -e /dev/vhost-net ]; then
+        echo "Missing virtio net device. Have you inserted vhost-net module?"
+        echo "For further help see"
+        echo "$YOCTO_PARAVIRT_KVM_WIKI";
+        exit 1;
+    fi
     if 9<>/dev/kvm ; then
-        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm"
+        SCRIPT_QEMU_OPT="$SCRIPT_QEMU_OPT -enable-kvm -cpu host"
+        KVM_ACTIVE="yes"
     else
         echo "You have no rights on /dev/kvm."
         echo "Please change the ownership of this file as described at"
         echo "$YOCTO_KVM_WIKI";
         exit 1;
     fi
+    if [ ! -w /dev/vhost-net -a -r /dev/vhost-net ]; then
+        echo "You have no rights on /dev/vhost-net."
+        echo "Please change the ownership of this file as described at"
+        echo "$YOCTO_PARAVIRT_KVM_WIKI";
+        exit 1;
+    fi
 fi
 
 machine2=`echo $MACHINE | tr 'a-z' 'A-Z' | sed 's/-/_/'`
diff --git a/scripts/runqemu-internal b/scripts/runqemu-internal
index a9b1c44..f2c8d83 100755
--- a/scripts/runqemu-internal
+++ b/scripts/runqemu-internal
@@ -221,7 +221,15 @@  n2=$(($n1 + 1))
 
 KERNEL_NETWORK_CMD="ip=192.168.7.$n2::192.168.7.$n1:255.255.255.0"
 QEMU_TAP_CMD="-net tap,vlan=0,ifname=$TAP,script=no,downscript=no"
-QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
+if [ "$KVM_ACTIVE" = "yes" ]; then
+    QEMU_NETWORK_CMD="-net nic,model=virtio $QEMU_TAP_CMD,vhost=on"
+    DROOT="/dev/vda"
+    ROOTFS_OPTIONS="-drive file=$ROOTFS,if=virtio"
+else
+    QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
+    DROOT="/dev/hda"
+    ROOTFS_OPTIONS="-hda $ROOTFS"
+fi
 KERNCMDLINE="mem=$QEMU_MEMORY"
 QEMU_UI_OPTIONS="-show-cursor -usb -usbdevice wacom-tablet"
 
@@ -321,8 +329,8 @@  if [ "$MACHINE" = "qemux86" ]; then
     QEMU=qemu-system-i386
     QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware"
     if [ "$FSTYPE" = "ext2" -o "$FSTYPE" = "ext3" -o "$FSTYPE" = "btrfs" ]; then
-        KERNCMDLINE="vga=0 root=/dev/hda rw mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
-        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
+        KERNCMDLINE="vga=0 root=$DROOT rw mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
+        QEMUOPTIONS="$QEMU_NETWORK_CMD $ROOTFS_OPTIONS $QEMU_UI_OPTIONS"
     fi
     if [ "$FSTYPE" = "nfs" ]; then
         if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then