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From 115507e5e8b97993b50ea7b39d6d4bb493973e46 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Fri, 5 Aug 2022 11:42:14 +0200
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Subject: [PATCH 9/9] pc-bios/s390-ccw: Fix booting with logical block size <
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physical block size
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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 207: pc-bios/s390-ccw: Fix booting with logical block size < physical block size
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RH-Commit: [1/1] ab22832592e0a48277bf7aca1b941a1be79aeab6
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RH-Bugzilla: 2112296
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Claudio Imbrenda <None>
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For accessing single blocks during boot, it's the logical block size that
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matters. (Physical block sizes are rather interesting e.g. for creating
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file systems with the correct alignment for speed reasons etc.).
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So the s390-ccw bios has to use the logical block size for calculating
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sector numbers during the boot phase, the "physical_block_exp" shift
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value must not be taken into account. This change fixes the boot process
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when the guest hast been installed on a disk where the logical block size
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differs from the physical one, e.g. if the guest has been installed
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like this:
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qemu-system-s390x -nographic -accel kvm -m 2G \
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-drive if=none,id=d1,file=fedora.iso,format=raw,media=cdrom \
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-device virtio-scsi -device scsi-cd,drive=d1 \
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-drive if=none,id=d2,file=test.qcow2,format=qcow2
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-device virtio-blk,drive=d2,physical_block_size=4096,logical_block_size=512
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Linux correctly uses the logical block size of 512 for the installation,
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but the s390-ccw bios tries to boot from a disk with 4096 block size so
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far, as long as this patch has not been applied yet (well, it used to work
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by accident in the past due to the virtio_assume_scsi() hack that used to
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enforce 512 byte sectors on all virtio-block disks, but that hack has been
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well removed in commit 5447de2619050a0a4d to fix other scenarios).
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2112296
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Message-Id: <20220805094214.285223-1-thuth@redhat.com>
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Reviewed-by: Cornelia Huck <cohuck@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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(cherry picked from commit 393296de19650e1400ca265914cfdeb313725363)
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---
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pc-bios/s390-ccw/virtio-blkdev.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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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 8271c47296..794f99b42c 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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@@ -173,7 +173,7 @@ int virtio_get_block_size(void)
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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.blk_size << vdev->config.blk.physical_block_exp;
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+ return vdev->config.blk.blk_size;
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case VIRTIO_ID_SCSI:
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return vdev->scsi_block_size;
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}
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--
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2.31.1
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