diff options
| author | Fan Zhang <zhangfan@linux.vnet.ibm.com> | 2015-02-12 18:02:14 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-02-13 16:14:09 +0100 |
| commit | df75a4e2c607836eee044d7e6b0d94724d6ebf21 (patch) | |
| tree | d17ea032e83adb532c7dbe56a8c2f8f68b3ccef8 /target-s390x/misc_helper.c | |
| parent | f0180f913e3bcd04cb132f5f6036e823a78e0673 (diff) | |
s390x/ipl: support diagnose 308 subcodes 5 and 6
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>
Diffstat (limited to 'target-s390x/misc_helper.c')
| -rw-r--r-- | target-s390x/misc_helper.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c index ef9758a96a..1c3df8e018 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 */ @@ -151,12 +153,15 @@ 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); @@ -180,14 +185,38 @@ 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); |