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From db58915fcaf3d24b64fe2c34cc15b5596b9a81bb 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 14/17] pc-bios/s390-ccw/virtio-blkdev: Request the right
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feature bits
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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: [9/10] 9dcd8c2f659f366f9487ab6473d1f0d7778b40a7 (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 9125a314cca4a1838b09305a87d8efb98f80ab67
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Author: Thomas Huth <thuth@redhat.com>
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Date: Mon Jul 4 13:19:01 2022 +0200
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pc-bios/s390-ccw/virtio-blkdev: Request the right feature bits
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The virtio-blk code uses the block size and geometry fields in the
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config area. According to the virtio-spec, these have to be negotiated
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with the right feature bits during initialization, otherwise they
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might not be available. QEMU is so far very forgiving and always
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provides them, but we should not rely on this behavior, so let's
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better request them properly via the VIRTIO_BLK_F_GEOMETRY and
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VIRTIO_BLK_F_BLK_SIZE feature bits.
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Message-Id: <20220704111903.62400-11-thuth@redhat.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 | 4 ++++
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1 file changed, 4 insertions(+)
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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 c175b66a47..8271c47296 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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@@ -13,6 +13,9 @@
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#include "virtio.h"
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#include "virtio-scsi.h"
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+#define VIRTIO_BLK_F_GEOMETRY (1 << 4)
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+#define VIRTIO_BLK_F_BLK_SIZE (1 << 6)
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+
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static int virtio_blk_read_many(VDev *vdev, ulong sector, void *load_addr,
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int sec_num)
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{
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@@ -223,6 +226,7 @@ int virtio_blk_setup_device(SubChannelId schid)
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{
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VDev *vdev = virtio_get_device();
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+ vdev->guest_features[0] = VIRTIO_BLK_F_GEOMETRY | VIRTIO_BLK_F_BLK_SIZE;
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vdev->schid = schid;
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virtio_setup_ccw(vdev);
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--
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2.31.1
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