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SUSE:SLE-12-SP2:GA
qemu.3557
0191-s390x-ipl-support-diagnose-308-subc.patch
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File 0191-s390x-ipl-support-diagnose-308-subc.patch of Package qemu.3557
From 71ae3d4626b30541b0c1fce4ce91305c2117e3fd Mon Sep 17 00:00:00 2001 From: Fan Zhang <zhangfan@linux.vnet.ibm.com> Date: Thu, 12 Feb 2015 18:02:14 +0100 Subject: [PATCH] s390x/ipl: support diagnose 308 subcodes 5 and 6 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To support dynamically updating the IPL device from inside the KVM guest on the s390 platform, DIAG 308 instruction is intercepted in QEMU to handle the request. Subcode 5 allows to specify a new boot device, which is saved for later in the s390_ipl device. This also allows to switch from an external kernel to a boot device. Subcode 6 retrieves boot device configuration that has been previously set. Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Fan Zhang <zhangfan@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> (cherry picked from commit df75a4e2c607836eee044d7e6b0d94724d6ebf21) Signed-off-by: Andreas Färber <afaerber@suse.de> --- hw/s390x/ipl.c | 87 ++++++++++++++++++++++++++++++++++++++-------- hw/s390x/ipl.h | 24 +++++++++++++ hw/s390x/s390-virtio.c | 2 ++ target-s390x/misc_helper.c | 33 ++++++++++++++++-- 4 files changed, 129 insertions(+), 17 deletions(-) create mode 100644 hw/s390x/ipl.h diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c index 8e58838..6bfedfa 100644 --- a/hw/s390x/ipl.c +++ b/hw/s390x/ipl.c @@ -18,6 +18,7 @@ #include "hw/sysbus.h" #include "hw/s390x/virtio-ccw.h" #include "hw/s390x/css.h" +#include "ipl.h" #define KERN_IMAGE_START 0x010000UL #define KERN_PARM_AREA 0x010480UL @@ -52,12 +53,17 @@ typedef struct S390IPLState { uint64_t start_addr; uint64_t bios_start_addr; bool enforce_bios; + IplParameterBlock iplb; + bool iplb_valid; /*< public >*/ char *kernel; char *initrd; char *cmdline; char *firmware; + uint8_t cssid; + uint8_t ssid; + uint16_t devno; } S390IPLState; @@ -164,6 +170,69 @@ static Property s390_ipl_properties[] = { DEFINE_PROP_END_OF_LIST(), }; +/* + * In addition to updating the iplstate, this function returns: + * - 0 if system was ipled with external kernel + * - -1 if no valid boot device was found + * - ccw id of the boot device otherwise + */ +static uint64_t s390_update_iplstate(CPUS390XState *env, S390IPLState *ipl) +{ + DeviceState *dev_st; + + if (ipl->iplb_valid) { + ipl->cssid = 0; + ipl->ssid = 0; + ipl->devno = ipl->iplb.devno; + goto out; + } + + if (ipl->kernel) { + return 0; + } + + dev_st = get_boot_device(0); + if (dev_st) { + VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast( + OBJECT(qdev_get_parent_bus(dev_st)->parent), + TYPE_VIRTIO_CCW_DEVICE); + if (ccw_dev) { + ipl->cssid = ccw_dev->sch->cssid; + ipl->ssid = ccw_dev->sch->ssid; + ipl->devno = ccw_dev->sch->devno; + goto out; + } + } + + return -1; +out: + return ipl->cssid << 24 | ipl->ssid << 16 | ipl->devno; +} + +int s390_ipl_update_diag308(IplParameterBlock *iplb) +{ + S390IPLState *ipl; + + ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL)); + if (ipl) { + ipl->iplb = *iplb; + ipl->iplb_valid = true; + return 0; + } + return -1; +} + +IplParameterBlock *s390_ipl_get_iplb(void) +{ + S390IPLState *ipl; + + ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL)); + if (!ipl || !ipl->iplb_valid) { + return NULL; + } + return &ipl->iplb; +} + static void s390_ipl_reset(DeviceState *dev) { S390IPLState *ipl = S390_IPL(dev); @@ -173,21 +242,9 @@ static void s390_ipl_reset(DeviceState *dev) env->psw.addr = ipl->start_addr; env->psw.mask = IPL_PSW_MASK; - if (!ipl->kernel) { - /* Tell firmware, if there is a preferred boot device */ - env->regs[7] = -1; - DeviceState *dev_st = get_boot_device(0); - if (dev_st) { - VirtioCcwDevice *ccw_dev = (VirtioCcwDevice *) object_dynamic_cast( - OBJECT(qdev_get_parent_bus(dev_st)->parent), - TYPE_VIRTIO_CCW_DEVICE); - - if (ccw_dev) { - env->regs[7] = ccw_dev->sch->cssid << 24 | - ccw_dev->sch->ssid << 16 | - ccw_dev->sch->devno; - } - } + if (!ipl->kernel || ipl->iplb_valid) { + env->psw.addr = ipl->bios_start_addr; + env->regs[7] = s390_update_iplstate(env, ipl); } s390_add_running_cpu(cpu); diff --git a/hw/s390x/ipl.h b/hw/s390x/ipl.h new file mode 100644 index 0000000..f1d082f --- /dev/null +++ b/hw/s390x/ipl.h @@ -0,0 +1,24 @@ +/* + * s390 IPL device + * + * Copyright 2015 IBM Corp. + * Author(s): Zhang Fan <bjfanzh@cn.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#ifndef HW_S390_IPL_H +#define HW_S390_IPL_H + +typedef struct IplParameterBlock { + uint8_t reserved1[110]; + uint16_t devno; + uint8_t reserved2[88]; +} IplParameterBlock; + +int s390_ipl_update_diag308(IplParameterBlock *iplb); +IplParameterBlock *s390_ipl_get_iplb(void); + +#endif diff --git a/hw/s390x/s390-virtio.c b/hw/s390x/s390-virtio.c index 17eabf6..9eec59c 100644 --- a/hw/s390x/s390-virtio.c +++ b/hw/s390x/s390-virtio.c @@ -178,6 +178,8 @@ void s390_init_ipl_dev(const char *kernel_filename, qdev_prop_set_string(dev, "cmdline", kernel_cmdline); qdev_prop_set_string(dev, "firmware", firmware); qdev_prop_set_bit(dev, "enforce_bios", enforce_bios); + object_property_add_child(qdev_get_machine(), "s390-ipl", + OBJECT(dev), NULL); qdev_init_nofail(dev); } diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c index 294b3ed..163f48f 100644 --- a/target-s390x/misc_helper.c +++ b/target-s390x/misc_helper.c @@ -25,6 +25,7 @@ #include <string.h> #include "sysemu/kvm.h" #include "qemu/timer.h" +#include "exec/address-spaces.h" #ifdef CONFIG_KVM #include <linux/kvm.h> #endif @@ -34,6 +35,7 @@ #include "sysemu/cpus.h" #include "sysemu/sysemu.h" #include "hw/s390x/ebcdic.h" +#include "hw/s390x/ipl.h" #endif /* #define DEBUG_HELPER */ @@ -158,12 +160,15 @@ static int load_normal_reset(S390CPU *cpu) return 0; } +#define DIAG_308_RC_OK 0x0001 #define DIAG_308_RC_NO_CONF 0x0102 #define DIAG_308_RC_INVALID 0x0402 + void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3) { uint64_t addr = env->regs[r1]; uint64_t subcode = env->regs[r3]; + IplParameterBlock *iplb; if (env->psw.mask & PSW_MASK_PSTATE) { program_interrupt(env, PGM_PRIVILEGED, ILEN_LATER_INC); @@ -187,14 +192,38 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3) program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC); return; } - env->regs[r1+1] = DIAG_308_RC_INVALID; + if (!address_space_access_valid(&address_space_memory, addr, + sizeof(IplParameterBlock), false)) { + program_interrupt(env, PGM_ADDRESSING, ILEN_LATER_INC); + return; + } + iplb = g_malloc0(sizeof(struct IplParameterBlock)); + cpu_physical_memory_read(addr, iplb, sizeof(struct IplParameterBlock)); + if (!s390_ipl_update_diag308(iplb)) { + env->regs[r1 + 1] = DIAG_308_RC_OK; + } else { + env->regs[r1 + 1] = DIAG_308_RC_INVALID; + } + g_free(iplb); return; case 6: if ((r1 & 1) || (addr & 0x0fffULL)) { program_interrupt(env, PGM_SPECIFICATION, ILEN_LATER_INC); return; } - env->regs[r1+1] = DIAG_308_RC_NO_CONF; + if (!address_space_access_valid(&address_space_memory, addr, + sizeof(IplParameterBlock), true)) { + program_interrupt(env, PGM_ADDRESSING, ILEN_LATER_INC); + return; + } + iplb = s390_ipl_get_iplb(); + if (iplb) { + cpu_physical_memory_write(addr, iplb, + sizeof(struct IplParameterBlock)); + env->regs[r1 + 1] = DIAG_308_RC_OK; + } else { + env->regs[r1 + 1] = DIAG_308_RC_NO_CONF; + } return; default: hw_error("Unhandled diag308 subcode %" PRIx64, subcode);
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