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From f07e4629a7c58407f903810a038660c88c6a6315 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Fri, 8 Jul 2022 20:49:01 +0200
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Subject: [PATCH 08/17] pc-bios/s390-ccw/virtio-blkdev: Simplify/fix
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virtio_ipl_disk_is_valid()
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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 106: pc-bios/s390-ccw: Fix boot from disks with 4k sectors that do not have the typical DASD geometry
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RH-Commit: [3/10] fb06830a3e50d9da3d84913b50bb227865cc44b3 (thuth/qemu-kvm-cs9)
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RH-Bugzilla: 2098077
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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Bugzilla: http://bugzilla.redhat.com/2098077
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commit bbf615f7b707f009ef8e757d170902ad33b90644
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Author: Thomas Huth <thuth@redhat.com>
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Date: Mon Jul 4 13:18:55 2022 +0200
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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
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disk with a sector size of 4096. For example:
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dasdfmt -b 4096 -d cdl -y -p -M quick /dev/dasdX
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fdasd -a /dev/dasdX
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install a guest onto /dev/dasdX1 using virtio-blk
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qemu-system-s390x -nographic -hda /dev/dasdX1
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The bios then bails out with:
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! Cannot read block 0 !
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Looking at virtio_ipl_disk_is_valid() and especially the function
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virtio_disk_is_scsi(), it does not really make sense that we expect
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only such a limited disk geometry (like a block size of 512) for
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our boot disks. Let's relax the check and allow everything that
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remotely looks like a sane disk.
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Message-Id: <20220704111903.62400-5-thuth@redhat.com>
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Reviewed-by: Eric Farman <farman@linux.ibm.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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---
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pc-bios/s390-ccw/virtio-blkdev.c | 41 ++++++--------------------------
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pc-bios/s390-ccw/virtio.h | 2 --
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2 files changed, 7 insertions(+), 36 deletions(-)
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diff --git a/pc-bios/s390-ccw/virtio-blkdev.c b/pc-bios/s390-ccw/virtio-blkdev.c
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index 6483307630..7e13155589 100644
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--- a/pc-bios/s390-ccw/virtio-blkdev.c
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+++ b/pc-bios/s390-ccw/virtio-blkdev.c
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@@ -166,46 +166,19 @@ void virtio_assume_eckd(void)
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virtio_eckd_sectors_for_block_size(vdev->config.blk.blk_size);
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}
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-bool virtio_disk_is_scsi(void)
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-{
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- VDev *vdev = virtio_get_device();
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-
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- if (vdev->guessed_disk_nature == VIRTIO_GDN_SCSI) {
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- return true;
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- }
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- switch (vdev->senseid.cu_model) {
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- case VIRTIO_ID_BLOCK:
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- return (vdev->config.blk.geometry.heads == 255)
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- && (vdev->config.blk.geometry.sectors == 63)
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- && (virtio_get_block_size() == VIRTIO_SCSI_BLOCK_SIZE);
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- case VIRTIO_ID_SCSI:
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- return true;
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- }
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- return false;
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-}
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-
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-bool virtio_disk_is_eckd(void)
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+bool virtio_ipl_disk_is_valid(void)
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{
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+ int blksize = virtio_get_block_size();
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VDev *vdev = virtio_get_device();
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- const int block_size = virtio_get_block_size();
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- if (vdev->guessed_disk_nature == VIRTIO_GDN_DASD) {
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+ if (vdev->guessed_disk_nature == VIRTIO_GDN_SCSI ||
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+ vdev->guessed_disk_nature == VIRTIO_GDN_DASD) {
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return true;
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}
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- switch (vdev->senseid.cu_model) {
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- case VIRTIO_ID_BLOCK:
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- return (vdev->config.blk.geometry.heads == 15)
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- && (vdev->config.blk.geometry.sectors ==
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- virtio_eckd_sectors_for_block_size(block_size));
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- case VIRTIO_ID_SCSI:
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- return false;
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- }
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- return false;
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-}
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-bool virtio_ipl_disk_is_valid(void)
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-{
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- return virtio_disk_is_scsi() || virtio_disk_is_eckd();
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+ return (vdev->senseid.cu_model == VIRTIO_ID_BLOCK ||
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+ vdev->senseid.cu_model == VIRTIO_ID_SCSI) &&
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+ blksize >= 512 && blksize <= 4096;
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}
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int virtio_get_block_size(void)
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diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h
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index 9e410bde6f..241730effe 100644
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--- a/pc-bios/s390-ccw/virtio.h
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+++ b/pc-bios/s390-ccw/virtio.h
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@@ -186,8 +186,6 @@ void virtio_assume_scsi(void);
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void virtio_assume_eckd(void);
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void virtio_assume_iso9660(void);
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-extern bool virtio_disk_is_scsi(void);
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-extern bool virtio_disk_is_eckd(void);
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extern bool virtio_ipl_disk_is_valid(void);
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extern int virtio_get_block_size(void);
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extern uint8_t virtio_get_heads(void);
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--
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2.31.1
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