From e2c6cd567422bfa563be026b9741a1854aecdc06 Mon Sep 17 00:00:00 2001 From: Collin Walling Date: Fri, 13 Nov 2020 17:10:22 -0500 Subject: [PATCH] s390/kvm: fix diag318 propagation and reset functionality The Control Program Name Code (CPNC) portion of the diag318 info must be set within the SIE block of each VCPU in the configuration. The handler will iterate through each VCPU and dirty the diag318_info reg to be synced with KVM on a subsequent sync_regs call. Additionally, the diag318 info resets must be handled via userspace. As such, QEMU will reset this value for each VCPU during a modified clear, load normal, and load clear reset event. Fixes: fabdada9357b ("s390: guest support for diagnose 0x318") Signed-off-by: Collin Walling Message-Id: <20201113221022.257054-1-walling@linux.ibm.com> Reviewed-by: Thomas Huth Reviewed-by: Janosch Frank Signed-off-by: Cornelia Huck --- hw/s390x/s390-virtio-ccw.c | 4 ++++ target/s390x/cpu.c | 7 +++++++ target/s390x/cpu.h | 1 + target/s390x/kvm-stub.c | 4 ++++ target/s390x/kvm.c | 22 +++++++++++++++++----- target/s390x/kvm_s390x.h | 1 + 6 files changed, 34 insertions(+), 5 deletions(-) diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index 22222c4fd5..4e140bbead 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -486,6 +486,10 @@ static void s390_machine_reset(MachineState *machine) default: g_assert_not_reached(); } + + CPU_FOREACH(t) { + run_on_cpu(t, s390_do_cpu_set_diag318, RUN_ON_CPU_HOST_ULONG(0)); + } s390_ipl_clear_reset_request(); } diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c index 66f5942b53..7b66718c44 100644 --- a/target/s390x/cpu.c +++ b/target/s390x/cpu.c @@ -447,6 +447,13 @@ void s390_enable_css_support(S390CPU *cpu) kvm_s390_enable_css_support(cpu); } } + +void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg) +{ + if (kvm_enabled()) { + kvm_s390_set_diag318(cs, arg.host_ulong); + } +} #endif static gchar *s390_gdb_arch_name(CPUState *cs) diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index f875ebf0f4..60d434d5ed 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -769,6 +769,7 @@ int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit); void s390_set_max_pagesize(uint64_t pagesize, Error **errp); void s390_cmma_reset(void); void s390_enable_css_support(S390CPU *cpu); +void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg); int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id, int vq, bool assign); #ifndef CONFIG_USER_ONLY diff --git a/target/s390x/kvm-stub.c b/target/s390x/kvm-stub.c index aa185017a2..9970b5a8c7 100644 --- a/target/s390x/kvm-stub.c +++ b/target/s390x/kvm-stub.c @@ -120,3 +120,7 @@ void kvm_s390_stop_interrupt(S390CPU *cpu) void kvm_s390_restart_interrupt(S390CPU *cpu) { } + +void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info) +{ +} diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c index baa070fdf7..b8385e6b95 100644 --- a/target/s390x/kvm.c +++ b/target/s390x/kvm.c @@ -1611,10 +1611,23 @@ static int handle_sw_breakpoint(S390CPU *cpu, struct kvm_run *run) return -ENOENT; } +void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info) +{ + CPUS390XState *env = &S390_CPU(cs)->env; + + /* Feat bit is set only if KVM supports sync for diag318 */ + if (s390_has_feat(S390_FEAT_DIAG_318)) { + env->diag318_info = diag318_info; + cs->kvm_run->s.regs.diag318 = diag318_info; + cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_DIAG318; + } +} + static void handle_diag_318(S390CPU *cpu, struct kvm_run *run) { uint64_t reg = (run->s390_sieic.ipa & 0x00f0) >> 4; uint64_t diag318_info = run->s.regs.gprs[reg]; + CPUState *t; /* * DIAG 318 can only be enabled with KVM support. As such, let's @@ -1622,13 +1635,12 @@ static void handle_diag_318(S390CPU *cpu, struct kvm_run *run) */ if (!s390_has_feat(S390_FEAT_DIAG_318)) { kvm_s390_program_interrupt(cpu, PGM_SPECIFICATION); + return; } - cpu->env.diag318_info = diag318_info; - - if (can_sync_regs(CPU(cpu), KVM_SYNC_DIAG318)) { - run->s.regs.diag318 = diag318_info; - run->kvm_dirty_regs |= KVM_SYNC_DIAG318; + CPU_FOREACH(t) { + run_on_cpu(t, s390_do_cpu_set_diag318, + RUN_ON_CPU_HOST_ULONG(diag318_info)); } } diff --git a/target/s390x/kvm_s390x.h b/target/s390x/kvm_s390x.h index 6ab17c81b7..25bbe98b25 100644 --- a/target/s390x/kvm_s390x.h +++ b/target/s390x/kvm_s390x.h @@ -45,5 +45,6 @@ void kvm_s390_set_max_pagesize(uint64_t pagesize, Error **errp); void kvm_s390_crypto_reset(void); void kvm_s390_restart_interrupt(S390CPU *cpu); void kvm_s390_stop_interrupt(S390CPU *cpu); +void kvm_s390_set_diag318(CPUState *cs, uint64_t diag318_info); #endif /* KVM_S390X_H */