File 0187-s390-ccw.img-Allow-bigger-ramdisk-s.patch of Package qemu.4227

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File 0187-s390-ccw.img-Allow-bigger-ramdisk-s.patch of Package qemu.4227

From 25c3a675f244877944d6487e02c254c8ab3fe053 Mon Sep 17 00:00:00 2001
From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Mon, 2 Mar 2015 16:27:08 +0100
Subject: [PATCH] s390-ccw.img: Allow bigger ramdisk sizes or offsets
MIME-Version: 1.0
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The s390-ccw bios creates the the virtqueue at 100MB. For
big ramdisks or offsets (via zipl) this gets overwritten.
As a quick band-aid, lets move the virtqueue into the bss
section, which is at 0x7f00000. As the bios code (text) is
at 0x7e00000 we can now handle ramdisk which are  ~27MB
bigger.

Long term we want to make the s390-ccw bios position
independent and load of at the end of memory.

Reported-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Message-Id: <1425310029-53396-2-git-send-email-borntraeger@de.ibm.com>
(cherry picked from commit 2be9d2927cca76d8475f0083e9ecc87baf1b8222)
[AF: BSC#928308]
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 pc-bios/s390-ccw/main.c     | 1 +
 pc-bios/s390-ccw/s390-ccw.h | 1 +
 pc-bios/s390-ccw/virtio.c   | 4 ++--
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 6f707bbcd4..584d4a2769 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -12,6 +12,7 @@
 #include "virtio.h"
 
 char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
+char ring_area[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
 uint64_t boot_value;
 static struct subchannel_id blk_schid = { .one = 1 };
 
diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
index ceb7418a50..9b3868bd6e 100644
--- a/pc-bios/s390-ccw/s390-ccw.h
+++ b/pc-bios/s390-ccw/s390-ccw.h
@@ -52,6 +52,7 @@ void disabled_wait(void);
 void virtio_panic(const char *string);
 void write_subsystem_identification(void);
 extern char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
+extern char ring_area[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
 extern uint64_t boot_value;
 
 /* sclp-ascii.c */
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 4dc91a7c43..76919f7594 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -378,10 +378,10 @@ void virtio_setup_block(struct subchannel_id schid)
     if (run_ccw(schid, CCW_CMD_READ_CONF, &blk_cfg, sizeof(blk_cfg))) {
         virtio_panic("Could not get block device configuration\n");
     }
-    vring_init(&block, config.num, (void *)(100 * 1024 * 1024),
+    vring_init(&block, config.num, ring_area,
                KVM_S390_VIRTIO_RING_ALIGN);
 
-    info.queue = (100ULL * 1024ULL* 1024ULL);
+    info.queue = (unsigned long long) ring_area;
     info.align = KVM_S390_VIRTIO_RING_ALIGN;
     info.index = 0;
     info.num = config.num;

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File 0187-s390-ccw.img-Allow-bigger-ramdisk-s.patch of Package qemu.4227

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