From 38ba55dd27a3b8308f0ce2e82a4c3eba3f197d20 Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Fri, 29 May 2020 05:53:53 -0400
Subject: [PATCH 11/42] pc-bios/s390x: Fix reset psw mask

RH-Author: Thomas Huth <thuth@redhat.com>
Message-id: <20200529055420.16855-12-thuth@redhat.com>
Patchwork-id: 97034
O-Subject: [RHEL-8.3.0 qemu-kvm PATCH v2 11/38] pc-bios/s390x: Fix reset psw mask
Bugzilla: 1828317
RH-Acked-by: Claudio Imbrenda <cimbrend@redhat.com>
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: David Hildenbrand <david@redhat.com>

From: Janosch Frank <frankja@linux.ibm.com>

We need to set the short psw indication bit in the reset psw, as it is
a short psw.

Exposed by "s390x: Properly fetch and test the short psw on diag308
subc 0/1".

Fixes: 962982329029 ("pc-bios/s390-ccw: do a subsystem reset before running the guest")
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20191203132813.2734-5-frankja@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit 5c6f0d5f46a77d77460dfb518cf1e1e4145c276e)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 pc-bios/s390-ccw/jump2ipl.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c
index 266f1502b9..da13c43cc0 100644
--- a/pc-bios/s390-ccw/jump2ipl.c
+++ b/pc-bios/s390-ccw/jump2ipl.c
@@ -12,11 +12,11 @@
 #define KERN_IMAGE_START 0x010000UL
 #define PSW_MASK_64 0x0000000100000000ULL
 #define PSW_MASK_32 0x0000000080000000ULL
-#define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64)
+#define PSW_MASK_SHORTPSW 0x0008000000000000ULL
+#define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_32 | PSW_MASK_64)
 
 typedef struct ResetInfo {
-    uint32_t ipl_mask;
-    uint32_t ipl_addr;
+    uint64_t ipl_psw;
     uint32_t ipl_continue;
 } ResetInfo;
 
@@ -50,7 +50,9 @@ void jump_to_IPL_code(uint64_t address)
     ResetInfo *current = 0;
 
     save = *current;
-    current->ipl_addr = (uint32_t) (uint64_t) &jump_to_IPL_2;
+
+    current->ipl_psw = (uint64_t) &jump_to_IPL_2;
+    current->ipl_psw |= RESET_PSW_MASK;
     current->ipl_continue = address & 0x7fffffff;
 
     debug_print_int("set IPL addr to", current->ipl_continue);
@@ -82,7 +84,7 @@ void jump_to_low_kernel(void)
     }
 
     /* Trying to get PSW at zero address */
-    if (*((uint64_t *)0) & IPL_PSW_MASK) {
+    if (*((uint64_t *)0) & RESET_PSW_MASK) {
         jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff);
     }
 
-- 
2.27.0