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pc-bios/s390-ccw/virtio-blkdev: Simplify/fix virtio_ipl_disk_is_valid()

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The s390-ccw bios fails to boot if the boot disk is a virtio-blk
disk with a sector size of 4096. For example:

 dasdfmt -b 4096 -d cdl -y -p -M quick /dev/dasdX
 fdasd -a /dev/dasdX
 install a guest onto /dev/dasdX1 using virtio-blk
 qemu-system-s390x -nographic -hda /dev/dasdX1

The bios then bails out with:

 ! Cannot read block 0 !

Looking at virtio_ipl_disk_is_valid() and especially the function
virtio_disk_is_scsi(), it does not really make sense that we expect
only such a limited disk geometry (like a block size of 512) for
our boot disks. Let's relax the check and allow everything that
remotely looks like a sane disk.

Message-Id: <20220704111903.62400-5-thuth@redhat.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Thomas Huth 2022-07-04 13:18:55 +02:00
parent 422865f667
commit bbf615f7b7
2 changed files with 11 additions and 40 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

49
pc-bios/s390-ccw/virtio-blkdev.c
View file

@ -166,46 +166,19 @@ void virtio_assume_eckd(void)
virtio_eckd_sectors_for_block_size(vdev->config.blk.blk_size);
}
bool virtio_disk_is_scsi(void)
{
VDev *vdev = virtio_get_device();
if (vdev->guessed_disk_nature == VIRTIO_GDN_SCSI) {
return true;
}
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
return (vdev->config.blk.geometry.heads == 255)
&& (vdev->config.blk.geometry.sectors == 63)
&& (virtio_get_block_size() == VIRTIO_SCSI_BLOCK_SIZE);
case VIRTIO_ID_SCSI:
return true;
}
return false;
}
bool virtio_disk_is_eckd(void)
{
VDev *vdev = virtio_get_device();
const int block_size = virtio_get_block_size();
if (vdev->guessed_disk_nature == VIRTIO_GDN_DASD) {
return true;
}
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
return (vdev->config.blk.geometry.heads == 15)
&& (vdev->config.blk.geometry.sectors ==
virtio_eckd_sectors_for_block_size(block_size));
case VIRTIO_ID_SCSI:
return false;
}
return false;
}
bool virtio_ipl_disk_is_valid(void)
{
return virtio_disk_is_scsi() || virtio_disk_is_eckd();
int blksize = virtio_get_block_size();
VDev *vdev = virtio_get_device();
if (vdev->guessed_disk_nature == VIRTIO_GDN_SCSI ||
vdev->guessed_disk_nature == VIRTIO_GDN_DASD) {
return true;
}
return (vdev->senseid.cu_model == VIRTIO_ID_BLOCK ||
vdev->senseid.cu_model == VIRTIO_ID_SCSI) &&
blksize >= 512 && blksize <= 4096;
}
int virtio_get_block_size(void)

2
pc-bios/s390-ccw/virtio.h
View file

@ -186,8 +186,6 @@ void virtio_assume_scsi(void);
void virtio_assume_eckd(void);
void virtio_assume_iso9660(void);
extern bool virtio_disk_is_scsi(void);
extern bool virtio_disk_is_eckd(void);
extern bool virtio_ipl_disk_is_valid(void);
extern int virtio_get_block_size(void);
extern uint8_t virtio_get_heads(void);