From c35aff184b2ed5be930da671ea25c857713555af Mon Sep 17 00:00:00 2001 From: Collin Walling Date: Wed, 17 Nov 2021 10:23:03 -0500 Subject: [PATCH] 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: fabdada9357b ("s390: guest support for diagnose 0x318") Reported-by: Christian Borntraeger Signed-off-by: Collin Walling Reviewed-by: Janosch Frank Reviewed-by: Christian Borntraeger Message-Id: <20211117152303.627969-1-walling@linux.ibm.com> Signed-off-by: Thomas Huth --- target/s390x/cpu.h | 4 ++-- target/s390x/kvm/kvm.c | 4 ++++ 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index ca3845d023..a75e559134 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -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 */ diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index 5b1fdb55c4..6acf14d5ec 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -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. + */ } }