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KVM: s390: Fix lpsw/e breaking event handling

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LPSW and LPSWE need to set the gbea on completion but currently don't.
Time to fix this up.

LPSWEY was designed to not set the bear.

Fixes: 48a3e950f4 ("KVM: s390: Add support for machine checks.")
Reported-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
This commit is contained in:
Janosch Frank 2026-03-23 15:35:22 +00:00
parent 2623c96f11
commit 1653545abc
1 changed files with 6 additions and 2 deletions
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8
arch/s390/kvm/priv.c
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@ -714,12 +714,13 @@ int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
{
psw_t *gpsw = &vcpu->arch.sie_block->gpsw;
psw32_t new_psw;
u64 addr;
u64 addr, iaddr;
int rc;
u8 ar;
vcpu->stat.instruction_lpsw++;
iaddr = gpsw->addr - kvm_s390_get_ilen(vcpu);
if (gpsw->mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
@ -737,18 +738,20 @@ int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
gpsw->addr = new_psw.addr & ~PSW32_ADDR_AMODE;
if (!is_valid_psw(gpsw))
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
vcpu->arch.sie_block->gbea = iaddr;
return 0;
}
static int handle_lpswe(struct kvm_vcpu *vcpu)
{
psw_t new_psw;
u64 addr;
u64 addr, iaddr;
int rc;
u8 ar;
vcpu->stat.instruction_lpswe++;
iaddr = vcpu->arch.sie_block->gpsw.addr - kvm_s390_get_ilen(vcpu);
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
@ -761,6 +764,7 @@ static int handle_lpswe(struct kvm_vcpu *vcpu)
vcpu->arch.sie_block->gpsw = new_psw;
if (!is_valid_psw(&vcpu->arch.sie_block->gpsw))
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
vcpu->arch.sie_block->gbea = iaddr;
return 0;
}