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s390: kvm: adjust diag318 resets to retain data 

The CPNC portion of the diag318 data is erroneously reset during an
initial CPU reset caused by SIGP. Let's go ahead and relocate the
diag318_info field within the CPUS390XState struct such that it is
only zeroed during a clear reset. This way, the CPNC will be retained
for each VCPU in the configuration after the diag318 instruction
has been invoked.

The s390_machine_reset code already takes care of zeroing the diag318
data on VM resets, which also cover resets caused by diag308.

Fixes: fabdada935 ("s390: guest support for diagnose 0x318")
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Collin Walling <walling@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Message-Id: <20211117152303.627969-1-walling@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
staging
Collin Walling 2021-11-17 10:23:03 -05:00 committed by Thomas Huth
parent 29eb5c2c86
commit c35aff184b
2 changed files with 6 additions and 2 deletions
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4
target/s390x/cpu.h
View File

@ -63,6 +63,8 @@ struct CPUS390XState {
uint64_t etoken; /* etoken */
uint64_t etoken_extension; /* etoken extension */
uint64_t diag318_info;
/* Fields up to this point are not cleared by initial CPU reset */
struct {} start_initial_reset_fields;
@ -118,8 +120,6 @@ struct CPUS390XState {
uint16_t external_call_addr;
DECLARE_BITMAP(emergency_signals, S390_MAX_CPUS);
uint64_t diag318_info;
#if !defined(CONFIG_USER_ONLY)
uint64_t tlb_fill_tec; /* translation exception code during tlb_fill */
int tlb_fill_exc; /* exception number seen during tlb_fill */

4
target/s390x/kvm/kvm.c
View File

@ -1585,6 +1585,10 @@ void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info)
env->diag318_info = diag318_info;
cs->kvm_run->s.regs.diag318 = diag318_info;
cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_DIAG318;
/*
* diag 318 info is zeroed during a clear reset and
* diag 308 IPL subcodes.
*/
}
}