Re: [SeaBIOS] virtio-blk ... block size 4096 is unsupported

[James Shimer]

After thinking about this some more, I'm not sure there is anything that can be done due to the fact that boot is using interfaces that assume 512 byte sectors such as a read sectors 13h.  Is that why BIOS/boot is stuck, changing the read to allow 4k sector size could cause buffer over run because the 13h interface doesn't specify the sector size?

________________________________________
From: SeaBIOS  on behalf of James Shimer 
Sent: Tuesday, April 5, 2016 12:25 AM
To: [e-mail]
Subject: [SeaBIOS] virtio-blk ... block size 4096 is unsupported

Hi,

I've been doing some testing if KVM with 4K physical sector virtio disks and they work with KVM as a none boot disk.  We'd like to be able to boot a 4k physical sector disk in KVM, is there 4K support in any seabios newer/upcoming releases, or is there a way to configure for 4k sectors?

reference from master
src/hw/virtio-blk.c lin 142

if (vdrive->drive.blksize != DISK_SECTOR_SIZE) {
            dprintf(1, "virtio-blk %pP block size %d is unsupported\n",
                    pci, vdrive->drive.blksize);
            goto fail;
        }

Thanks,
Jim

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