Re: [PATCH] xen: privcmd: fix ioeventfd crash under PV domain

[Juergen Gross]

On 08.07.26 10:18, Val Packett wrote:
> Starting a virtio backend in a PV domain would panic the kernel in
> alloc_ioreq, trying to dereference vma->vm_private_data as a pages
> pointer when in reality it stayed as PRIV_VMA_LOCKED.
>
> Avoid crashing by handling the PRIV_VMA_LOCKED case in alloc_ioreq.
> PV support requires mapping the virtio ioreq page explicitly into
> the kernel's page tables, so do it on-demand when PRIV_VMA_LOCKED
> is seen.
>
> Signed-off-by: Val Packett <val@xxxxxxxxxxxxxxxxxxxxxx>

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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