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From 8128e12a8cb09bdb6bcb1b5735a9726f689e27c3 Mon Sep 17 00:00:00 2001
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From: Cornelia Huck <cohuck@redhat.com>
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Date: Wed, 17 Apr 2019 13:57:18 +0100
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Subject: [PATCH 01/24] s390x/ipl: Try to detect Linux vs non Linux for initial
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IPL PSW
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RH-Author: Cornelia Huck <cohuck@redhat.com>
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Message-id: <20190417135741.25297-2-cohuck@redhat.com>
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Patchwork-id: 85783
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O-Subject: [RHEL-8.1.0 qemu-kvm PATCH v2 01/24] s390x/ipl: Try to detect Linux vs non Linux for initial IPL PSW
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Bugzilla: 1699070
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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From: Christian Borntraeger <borntraeger@de.ibm.com>
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Right now the IPL device always starts from address 0x10000 (the usual
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Linux entry point). To run other guests (e.g. test programs) it is
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useful to use the IPL PSW from address 0. We can use the Linux magic
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at 0x10008 to decide.
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Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Message-Id: <20180612125933.262679-1-borntraeger@de.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit acd7ef837d8987ad4ef2ab8f8e8c0f13ab413dd5)
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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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 | 27 ++++++++++++++++++++++-----
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1 file changed, 22 insertions(+), 5 deletions(-)
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diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
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index 150f6c0..617ac43 100644
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--- a/hw/s390x/ipl.c
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+++ b/hw/s390x/ipl.c
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@@ -28,6 +28,7 @@
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#include "qemu/option.h"
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#define KERN_IMAGE_START 0x010000UL
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+#define LINUX_MAGIC_ADDR 0x010008UL
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#define KERN_PARM_AREA 0x010480UL
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#define INITRD_START 0x800000UL
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#define INITRD_PARM_START 0x010408UL
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@@ -104,7 +105,9 @@ static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
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static void s390_ipl_realize(DeviceState *dev, Error **errp)
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{
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S390IPLState *ipl = S390_IPL(dev);
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- uint64_t pentry = KERN_IMAGE_START;
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+ uint32_t *ipl_psw;
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+ uint64_t pentry;
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+ char *magic;
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int kernel_size;
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Error *err = NULL;
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@@ -156,10 +159,24 @@ static void s390_ipl_realize(DeviceState *dev, Error **errp)
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NULL, 1, EM_S390, 0, 0);
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if (kernel_size < 0) {
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kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
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- }
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- if (kernel_size < 0) {
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- error_setg(&err, "could not load kernel '%s'", ipl->kernel);
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- goto error;
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+ if (kernel_size < 0) {
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+ error_setg(&err, "could not load kernel '%s'", ipl->kernel);
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+ goto error;
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+ }
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+ /* if this is Linux use KERN_IMAGE_START */
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+ magic = rom_ptr(LINUX_MAGIC_ADDR);
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+ if (magic && !memcmp(magic, "S390EP", 6)) {
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+ pentry = KERN_IMAGE_START;
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+ } else {
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+ /* if not Linux load the address of the (short) IPL PSW */
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+ ipl_psw = rom_ptr(4);
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+ if (ipl_psw) {
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+ pentry = be32_to_cpu(*ipl_psw) & 0x7fffffffUL;
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+ } else {
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+ error_setg(&err, "Could not get IPL PSW");
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+ goto error;
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+ }
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+ }
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}
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/*
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* Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
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--
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1.8.3.1
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