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From 53053ea2e6c757e5d044655c8b61c485e0aad4ed Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Fri, 29 May 2020 05:53:59 -0400
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Subject: [PATCH 17/42] s390/ipl: sync back loadparm
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Thomas Huth <thuth@redhat.com>
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Message-id: <20200529055420.16855-18-thuth@redhat.com>
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Patchwork-id: 97039
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O-Subject: [RHEL-8.3.0 qemu-kvm PATCH v2 17/38] s390/ipl: sync back loadparm
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Bugzilla: 1828317
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RH-Acked-by: Claudio Imbrenda <cimbrend@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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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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From: Halil Pasic <pasic@linux.ibm.com>
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We expose loadparm as a r/w machine property, but if loadparm is set by
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the guest via DIAG 308, we don't update the property. Having a
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disconnect between the guest view and the QEMU property is not nice in
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itself, but things get even worse for SCSI, where under certain
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circumstances (see 789b5a401b "s390: Ensure IPL from SCSI works as
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expected" for details) we call s390_gen_initial_iplb() on resets
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effectively overwriting the guest/user supplied loadparm with the stale
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value.
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Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
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Fixes: 7104bae9de ("hw/s390x: provide loadparm property for the machine")
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Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
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Reviewed-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
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Tested-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20200309133223.100491-1-pasic@linux.ibm.com>
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[borntraeger@de.ibm.com: use reverse xmas tree]
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Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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(cherry picked from commit 0a01e082a428b921e48b5314881b1f23a7b0fe50)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/s390x/ipl.c | 25 +++++++++++++++++++++++++
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1 file changed, 25 insertions(+)
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diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
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index 0b7548a549..f25339c503 100644
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--- a/hw/s390x/ipl.c
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+++ b/hw/s390x/ipl.c
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@@ -529,6 +529,30 @@ static bool is_virtio_scsi_device(IplParameterBlock *iplb)
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return is_virtio_ccw_device_of_type(iplb, VIRTIO_ID_SCSI);
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}
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+static void update_machine_ipl_properties(IplParameterBlock *iplb)
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+{
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+ Object *machine = qdev_get_machine();
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+ Error *err = NULL;
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+
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+ /* Sync loadparm */
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+ if (iplb->flags & DIAG308_FLAGS_LP_VALID) {
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+ uint8_t *ebcdic_loadparm = iplb->loadparm;
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+ char ascii_loadparm[8];
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+ int i;
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+
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+ for (i = 0; i < 8 && ebcdic_loadparm[i]; i++) {
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+ ascii_loadparm[i] = ebcdic2ascii[(uint8_t) ebcdic_loadparm[i]];
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+ }
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+ ascii_loadparm[i] = 0;
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+ object_property_set_str(machine, ascii_loadparm, "loadparm", &err;;
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+ } else {
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+ object_property_set_str(machine, "", "loadparm", &err;;
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+ }
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+ if (err) {
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+ warn_report_err(err);
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+ }
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+}
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+
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void s390_ipl_update_diag308(IplParameterBlock *iplb)
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{
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S390IPLState *ipl = get_ipl_device();
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@@ -536,6 +560,7 @@ void s390_ipl_update_diag308(IplParameterBlock *iplb)
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ipl->iplb = *iplb;
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ipl->iplb_valid = true;
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ipl->netboot = is_virtio_net_device(iplb);
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+ update_machine_ipl_properties(iplb);
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}
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IplParameterBlock *s390_ipl_get_iplb(void)
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--
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2.27.0
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