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From 303fb3ddcdbbd1373c5b1aa28e03f90507e217f3 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 10/17] pc-bios/s390-ccw/virtio: Set missing status bits while
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initializing
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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: [5/10] 4bc44d9adae055fb60b79d04a2f08535b4d38d2b (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 175aa06a152ef6b58ba9b2e47a1296b024dea70c
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Author: Thomas Huth <thuth@redhat.com>
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Date: Mon Jul 4 13:18:57 2022 +0200
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pc-bios/s390-ccw/virtio: Set missing status bits while initializing
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According chapter "3.1.1 Driver Requirements: Device Initialization"
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of the Virtio specification (v1.1), a driver for a device has to set
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the ACKNOWLEDGE and DRIVER bits in the status field after resetting
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the device. The s390-ccw bios skipped these steps so far and seems
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like QEMU never cared. Anyway, it's better to follow the spec, so
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let's set these bits now in the right spots, too.
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Message-Id: <20220704111903.62400-7-thuth@redhat.com>
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Acked-by: Christian Borntraeger <borntraeger@linux.ibm.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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Signed-off-by: Thomas Huth <thuth@redhat.com>
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---
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pc-bios/s390-ccw/virtio.c | 18 ++++++++++++++----
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1 file changed, 14 insertions(+), 4 deletions(-)
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diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
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index 5d2c6e3381..4e85a2eb82 100644
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--- a/pc-bios/s390-ccw/virtio.c
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+++ b/pc-bios/s390-ccw/virtio.c
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@@ -220,7 +220,7 @@ int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd)
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void virtio_setup_ccw(VDev *vdev)
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{
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int i, rc, cfg_size = 0;
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- unsigned char status = VIRTIO_CONFIG_S_DRIVER_OK;
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+ uint8_t status;
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struct VirtioFeatureDesc {
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uint32_t features;
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uint8_t index;
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@@ -234,6 +234,10 @@ void virtio_setup_ccw(VDev *vdev)
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run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false);
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+ status = VIRTIO_CONFIG_S_ACKNOWLEDGE;
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+ rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false);
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+ IPL_assert(rc == 0, "Could not write ACKNOWLEDGE status to host");
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+
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switch (vdev->senseid.cu_model) {
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case VIRTIO_ID_NET:
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vdev->nr_vqs = 2;
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@@ -253,6 +257,11 @@ void virtio_setup_ccw(VDev *vdev)
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default:
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panic("Unsupported virtio device\n");
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}
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+
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+ status |= VIRTIO_CONFIG_S_DRIVER;
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+ rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false);
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+ IPL_assert(rc == 0, "Could not write DRIVER status to host");
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+
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IPL_assert(
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run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false) == 0,
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"Could not get block device configuration");
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@@ -291,9 +300,10 @@ void virtio_setup_ccw(VDev *vdev)
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run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info), false) == 0,
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"Cannot set VQ info");
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}
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- IPL_assert(
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- run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false) == 0,
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- "Could not write status to host");
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+
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+ status |= VIRTIO_CONFIG_S_DRIVER_OK;
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+ rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false);
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+ IPL_assert(rc == 0, "Could not write DRIVER_OK status to host");
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}
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bool virtio_is_supported(SubChannelId schid)
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--
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2.31.1
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