Christoph Hellwig <hch@xxxxxxxxxxxxx> writes: > On Tue, Sep 22, 2015 at 06:27:50PM +0200, Vitaly Kuznetsov wrote: >> Storvsc driver needs to ensure there are no 'holes' in the presented >> sg list (all segments in the middle of the list need to be of PAGE_SIZE). > > I think it should instead set a virt_boundary. That's what we added for > the NVMe driver which has the same requirements, and Sagi recently also > switched iSER to it after we ensured that flag is handled correctly by > the SG_IO ioctl. Wow, I checked and blk_queue_virt_boundary(sdevice->request_queue, PAGE_SIZE - 1) seems to be solving the issue completely, no bounce buffer required. I'll test more and send v2 with removing the rest. -- Vitaly -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
