From 20f8724d0837acbe642c8c7698a4b256f34c1209 Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Fri, 8 Jul 2022 20:49:01 +0200
Subject: [PATCH 11/17] pc-bios/s390-ccw/virtio: Read device config after
 feature negotiation

RH-Author: Thomas Huth <thuth@redhat.com>
RH-MergeRequest: 106: pc-bios/s390-ccw: Fix boot from disks with 4k sectors that do not have the typical DASD geometry
RH-Commit: [6/10] 54d21e430b2dfba9e0a0823d6bb8ec7e7f8ff2ff (thuth/qemu-kvm-cs9)
RH-Bugzilla: 2098077
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: David Hildenbrand <david@redhat.com>
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>

Bugzilla: http://bugzilla.redhat.com/2098077

commit aa5c69ce99411c4886bcd051f288afc02b6d968d
Author: Thomas Huth <thuth@redhat.com>
Date:   Mon Jul 4 13:18:58 2022 +0200

    pc-bios/s390-ccw/virtio: Read device config after feature negotiation

    Feature negotiation should be done first, since some fields in the
    config area can depend on the negotiated features and thus should
    rather be read afterwards.

    While we're at it, also adjust the error message here a little bit
    (the code is nowadays used for non-block virtio devices, too).

    Message-Id: <20220704111903.62400-8-thuth@redhat.com>
    Reviewed-by: Eric Farman <farman@linux.ibm.com>
    Reviewed-by: Cornelia Huck <cohuck@redhat.com>
    Signed-off-by: Thomas Huth <thuth@redhat.com>

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 pc-bios/s390-ccw/virtio.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 4e85a2eb82..d8c2b52710 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -262,10 +262,6 @@ void virtio_setup_ccw(VDev *vdev)
     rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false);
     IPL_assert(rc == 0, "Could not write DRIVER status to host");
 
-    IPL_assert(
-        run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false) == 0,
-       "Could not get block device configuration");
-
     /* Feature negotiation */
     for (i = 0; i < ARRAY_SIZE(vdev->guest_features); i++) {
         feats.features = 0;
@@ -278,6 +274,9 @@ void virtio_setup_ccw(VDev *vdev)
         IPL_assert(rc == 0, "Could not set features bits");
     }
 
+    rc = run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false);
+    IPL_assert(rc == 0, "Could not get virtio device configuration");
+
     for (i = 0; i < vdev->nr_vqs; i++) {
         VqInfo info = {
             .queue = (unsigned long long) ring_area + (i * VIRTIO_RING_SIZE),
-- 
2.31.1