Re: Xen PV: Sample new PV driver for buffer sharing between domains

[Omkar Bolla <omkar.bolla@pathpartnertech.com>]

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Hi,

Thanks,
Basic state change is working now, after using above script.

As I said, I want to share buffer between two domains.
Could you please suggest outlines, how can I share buffer between 2
domains(Guest and Host)?

Thanks,
Omkar B

On Fri, Sep 28, 2018 at 7:12 PM Juergen Gross <jgross@suse.com> wrote:

> On 28/09/2018 14:55, Omkar Bolla wrote:
> > Hi,
> > I tried to run script after pause the domain and unpause domain after
> > run script. But I ended up with same error
>
> I looked at the script again, it is wrong. The permissions should
> be set for each node under the root path of the respective domains,
> the first permission should be "n$domid" ($domid is the owner who
> can always read/write, the n is "no access" for all domains not
> explicitly listed), the second permission should be "r$domid" as
> the other side should be able to read only.
>
> In order to do it correctly the script should be:
>
> #!/bin/bash
>
> DOMU_ID=$1
>
> if [ -z "$DOMU_ID"  ]; then
>   echo "Usage: $0 [domU ID]]"
>   echo
>   echo "Connects the new device, with dom0 as backend, domU as frontend"
>   exit 1
> fi
>
> # Pause domU as a script can't write an entry and set permission
> # in a single operation.
> xl pause $DOMU_ID
>
> DEVICE=mydevice
> DOMU_KEY=/local/domain/$DOMU_ID/device/$DEVICE/0
> DOM0_KEY=/local/domain/0/backend/$DEVICE/$DOMU_ID/0
>
> # Tell the domU about the new device and its backend
> xenstore-write $DOMU_KEY/backend-id 0
> xenstore-write $DOMU_KEY/backend
> "/local/domain/0/backend/$DEVICE/$DOMU_ID/0"
>
> # Tell the dom0 about the new device and its frontend
> xenstore-write $DOM0_KEY/frontend-id $DOMU_ID
> xenstore-write $DOM0_KEY/frontend "/local/domain/$DOMU_ID/device/$DEVICE/0"
>
> # Activate the device, dom0 needs to be activated last
> xenstore-write $DOMU_KEY/state 1
> xenstore-write $DOM0_KEY/state 1
>
> # Make sure the domU can read the dom0 data
> xenstore-chmod -r $DOM0_KEY n0 r$DOMU_ID
> xenstore-chmod -r $DOMU_KEY n$DOMU_ID r0
>
> xl unpause $DOMU_ID
>
>
> Juergen
>

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