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s390/kvm: fix diag318 propagation and reset functionality

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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: fabdada935 ("s390: guest support for diagnose 0x318")
Signed-off-by: Collin Walling <walling@linux.ibm.com>
Message-Id: <20201113221022.257054-1-walling@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@de.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Collin Walling 2020-11-13 17:10:22 -05:00 committed by Cornelia Huck
parent b696f2c6ba
commit e2c6cd5674
6 changed files with 34 additions and 5 deletions
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4
hw/s390x/s390-virtio-ccw.c
View File

@ -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();
}

7
target/s390x/cpu.c
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@ -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)

1
target/s390x/cpu.h
View File

@ -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

4
target/s390x/kvm-stub.c
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@ -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)
{
}

22
target/s390x/kvm.c
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@ -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));
}
}

1
target/s390x/kvm_s390x.h
View File

@ -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 */