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From 8350ad9c0f54519a06ec396c2997330615f4b470 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 05:53:58 -0400
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Subject: [PATCH 16/42] pc-bios: s390x: Save iplb location in lowcore
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RH-Author: Thomas Huth <thuth@redhat.com>
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Message-id: <20200529055420.16855-17-thuth@redhat.com>
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Patchwork-id: 97027
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O-Subject: [RHEL-8.3.0 qemu-kvm PATCH v2 16/38] pc-bios: s390x: Save iplb location in lowcore
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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: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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From: Janosch Frank <frankja@linux.ibm.com>
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The POP states that for a list directed IPL the IPLB is stored into
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memory by the machine loader and its address is stored at offset 0x14
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of the lowcore.
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ZIPL currently uses the address in offset 0x14 to access the IPLB and
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acquire flags about secure boot. If the IPLB address points into
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memory which has an unsupported mix of flags set, ZIPL will panic
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instead of booting the OS.
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As the lowcore can have quite a high entropy for a guest that did drop
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out of protected mode (i.e. rebooted) we encountered the ZIPL panic
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quite often.
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Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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Tested-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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Message-Id: <20200304114231.23493-19-frankja@linux.ibm.com>
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Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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(cherry picked from commit 9bfc04f9ef6802fff0fc77130ff345a541783363)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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pc-bios/s390-ccw/jump2ipl.c | 1 +
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pc-bios/s390-ccw/main.c | 8 +++++++-
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pc-bios/s390-ccw/netmain.c | 1 +
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pc-bios/s390-ccw/s390-arch.h | 10 ++++++++--
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pc-bios/s390-ccw/s390-ccw.h | 1 +
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5 files changed, 18 insertions(+), 3 deletions(-)
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diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c
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index da13c43cc0..4eba2510b0 100644
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--- a/pc-bios/s390-ccw/jump2ipl.c
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+++ b/pc-bios/s390-ccw/jump2ipl.c
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@@ -35,6 +35,7 @@ void jump_to_IPL_code(uint64_t address)
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{
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/* store the subsystem information _after_ the bootmap was loaded */
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write_subsystem_identification();
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+ write_iplb_location();
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/* prevent unknown IPL types in the guest */
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if (iplb.pbt == S390_IPL_TYPE_QEMU_SCSI) {
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diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
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index a21b386280..4e65b411e1 100644
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--- a/pc-bios/s390-ccw/main.c
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+++ b/pc-bios/s390-ccw/main.c
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@@ -9,6 +9,7 @@
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*/
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#include "libc.h"
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+#include "helper.h"
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#include "s390-arch.h"
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#include "s390-ccw.h"
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#include "cio.h"
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@@ -22,7 +23,7 @@ QemuIplParameters qipl;
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IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
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static bool have_iplb;
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static uint16_t cutype;
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-LowCore const *lowcore; /* Yes, this *is* a pointer to address 0 */
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+LowCore *lowcore; /* Yes, this *is* a pointer to address 0 */
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#define LOADPARM_PROMPT "PROMPT "
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#define LOADPARM_EMPTY " "
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@@ -42,6 +43,11 @@ void write_subsystem_identification(void)
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*zeroes = 0;
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}
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+void write_iplb_location(void)
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+{
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+ lowcore->ptr_iplb = ptr2u32(&iplb);
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+}
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+
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void panic(const char *string)
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{
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sclp_print(string);
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diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c
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index f2dcc01e27..309ffa30d9 100644
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--- a/pc-bios/s390-ccw/netmain.c
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+++ b/pc-bios/s390-ccw/netmain.c
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@@ -40,6 +40,7 @@
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#define DEFAULT_TFTP_RETRIES 20
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extern char _start[];
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+void write_iplb_location(void) {}
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#define KERNEL_ADDR ((void *)0L)
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#define KERNEL_MAX_SIZE ((long)_start)
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diff --git a/pc-bios/s390-ccw/s390-arch.h b/pc-bios/s390-ccw/s390-arch.h
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index 504fc7c2f0..5f36361c02 100644
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--- a/pc-bios/s390-ccw/s390-arch.h
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+++ b/pc-bios/s390-ccw/s390-arch.h
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@@ -36,7 +36,13 @@ typedef struct LowCore {
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/* prefix area: defined by architecture */
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PSWLegacy ipl_psw; /* 0x000 */
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uint32_t ccw1[2]; /* 0x008 */
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- uint32_t ccw2[2]; /* 0x010 */
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+ union {
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+ uint32_t ccw2[2]; /* 0x010 */
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+ struct {
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+ uint32_t reserved10;
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+ uint32_t ptr_iplb;
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+ };
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+ };
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uint8_t pad1[0x80 - 0x18]; /* 0x018 */
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uint32_t ext_params; /* 0x080 */
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uint16_t cpu_addr; /* 0x084 */
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@@ -85,7 +91,7 @@ typedef struct LowCore {
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PSW io_new_psw; /* 0x1f0 */
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} __attribute__((packed, aligned(8192))) LowCore;
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-extern LowCore const *lowcore;
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+extern LowCore *lowcore;
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static inline void set_prefix(uint32_t address)
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{
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diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
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index 11bce7d73c..21f27e7990 100644
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--- a/pc-bios/s390-ccw/s390-ccw.h
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+++ b/pc-bios/s390-ccw/s390-ccw.h
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@@ -57,6 +57,7 @@ void consume_io_int(void);
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/* main.c */
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void panic(const char *string);
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void write_subsystem_identification(void);
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+void write_iplb_location(void);
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extern char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
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unsigned int get_loadparm_index(void);
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--
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2.27.0
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