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...; > + > > +#define VIRT_PSTORE_ORDER 2 > > +#define VIRT_PSTORE_BUFSIZE (4096 << VIRT_PSTORE_ORDER) > > It may make sense to make the size of the buffer configurable through > the config space. Right. I'm considering it too, but it needs a buffer larger than kmsg_bytes (= 10K) to work properly in the current implementation. As this version is just to verify the idea is sane and useful, I used a fixed size buffer. Will change in the next version. > > (...) > > > diff --git a/include/uapi/linux/virtio_ids.h b/include/uapi/linux/virtio_ids.h &gt...

...; > + > > +#define VIRT_PSTORE_ORDER 2 > > +#define VIRT_PSTORE_BUFSIZE (4096 << VIRT_PSTORE_ORDER) > > It may make sense to make the size of the buffer configurable through > the config space. Right. I'm considering it too, but it needs a buffer larger than kmsg_bytes (= 10K) to work properly in the current implementation. As this version is just to verify the idea is sane and useful, I used a fixed size buffer. Will change in the next version. > > (...) > > > diff --git a/include/uapi/linux/virtio_ids.h b/include/uapi/linux/virtio_ids.h &gt...

...TORE_ORDER 2 > > > +#define VIRT_PSTORE_BUFSIZE (4096 << VIRT_PSTORE_ORDER) > > > > It may make sense to make the size of the buffer configurable through > > the config space. > > Right. I'm considering it too, but it needs a buffer larger than > kmsg_bytes (= 10K) to work properly in the current implementation. As > this version is just to verify the idea is sane and useful, I used a > fixed size buffer. Will change in the next version. Sure, that makes sense for a prototype. We can guard any config space entry with a feature bit, but this...

The virtio pstore driver provides interface to the pstore subsystem so that the guest kernel's log/dump message can be saved on the host machine. Users can access the log file directly on the host, or on the guest at the next boot using pstore filesystem. It currently deals with kernel log (printk) buffer only, but we can extend it to have other information (like ftrace dump) later. It

Hello, This is v2 of the virtio-pstore work. In this patchset I addressed most of feedbacks from previous version. Limiting disk size is not implemented yet. * changes in v2) - update VIRTIO_ID_PSTORE to 22 (Cornelia, Stefan) - make buffer size configurable (Cornelia) - support PSTORE_TYPE_CONSOLE (Kees) - use separate virtqueues for read and write - support concurrent async

Hello, This is v2 of the virtio-pstore work. In this patchset I addressed most of feedbacks from previous version. Limiting disk size is not implemented yet. * changes in v2) - update VIRTIO_ID_PSTORE to 22 (Cornelia, Stefan) - make buffer size configurable (Cornelia) - support PSTORE_TYPE_CONSOLE (Kees) - use separate virtqueues for read and write - support concurrent async