Re: [PATCH v2 10/13] s390x: protvirt: Set guest IPL PSW

[David Hildenbrand <david@redhat.com>]

On 29.11.19 10:48, Janosch Frank wrote:
> Handling of CPU reset and setting of the IPL psw from guest storage at
> offset 0 is done by a Ultravisor call. Let's only fetch it if
> necessary.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> ---
>  hw/s390x/pv.c              | 5 +++++
>  hw/s390x/pv.h              | 1 +
>  hw/s390x/s390-virtio-ccw.c | 2 +-
>  linux-headers/linux/kvm.h  | 1 +
>  target/s390x/cpu.c         | 9 ++++++++-
>  5 files changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/s390x/pv.c b/hw/s390x/pv.c
> index 0218070322..106252833f 100644
> --- a/hw/s390x/pv.c
> +++ b/hw/s390x/pv.c
> @@ -88,6 +88,11 @@ int s390_pv_set_sec_parms(uint64_t origin, uint64_t length)
>      return s390_pv_cmd(KVM_PV_VM_SET_SEC_PARMS, &args);
>  }
>  
> +int s390_pv_set_ipl_psw(CPUState *cs)
> +{
> +    return s390_pv_cmd_vcpu(cs, KVM_PV_VCPU_SET_IPL_PSW, NULL);
> +}
> +
>  /*
>   * Called for each component in the SE type IPL parameter block 0.
>   */
> diff --git a/hw/s390x/pv.h b/hw/s390x/pv.h
> index eb074e4bc9..e670c67270 100644
> --- a/hw/s390x/pv.h
> +++ b/hw/s390x/pv.h
> @@ -18,6 +18,7 @@ int s390_pv_vm_destroy(void);
>  int s390_pv_vcpu_destroy(CPUState *cs);
>  int s390_pv_vcpu_create(CPUState *cs);
>  int s390_pv_set_sec_parms(uint64_t origin, uint64_t length);
> +int s390_pv_set_ipl_psw(CPUState *cs);
>  int s390_pv_unpack(uint64_t addr, uint64_t size, uint64_t tweak);
>  int s390_pv_perf_clear_reset(void);
>  int s390_pv_verify(void);
> diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
> index 6fcd695b81..1133de9423 100644
> --- a/hw/s390x/s390-virtio-ccw.c
> +++ b/hw/s390x/s390-virtio-ccw.c
> @@ -408,7 +408,7 @@ static void s390_machine_reset(MachineState *machine)
>          /* Verify integrity */
>          s390_pv_verify();
>          env->pv = true;
> -        s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
> +        run_on_cpu(cs, s390_do_cpu_load_normal, RUN_ON_CPU_NULL);
>          break;
>      default:
>          g_assert_not_reached();
> diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
> index 4448d59960..7c6118c703 100644
> --- a/linux-headers/linux/kvm.h
> +++ b/linux-headers/linux/kvm.h
> @@ -1484,6 +1484,7 @@ enum pv_cmd_id {
>  	KVM_PV_VM_UNSHARE,
>  	KVM_PV_VCPU_CREATE,
>  	KVM_PV_VCPU_DESTROY,
> +	KVM_PV_VCPU_SET_IPL_PSW,
>  };
>  
>  struct kvm_pv_cmd {
> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
> index 52fefa1586..8c673dab2c 100644
> --- a/target/s390x/cpu.c
> +++ b/target/s390x/cpu.c
> @@ -37,6 +37,7 @@
>  #include "sysemu/hw_accel.h"
>  #include "hw/qdev-properties.h"
>  #ifndef CONFIG_USER_ONLY
> +#include "hw/s390x/pv.h"
>  #include "hw/boards.h"
>  #include "sysemu/arch_init.h"
>  #include "sysemu/sysemu.h"
> @@ -76,7 +77,13 @@ static bool s390_cpu_has_work(CPUState *cs)
>  static void s390_cpu_load_normal(CPUState *s)
>  {
>      S390CPU *cpu = S390_CPU(s);
> -    cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
> +    CPUS390XState *env = &cpu->env;
> +
> +    if (!env->pv) {
> +        cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
> +    } else {
> +        s390_pv_set_ipl_psw(s);
> +    }
>      cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;

Isn't that dead code for pv? AFAIKS, the psw is not synced back ...
maybe we should.

>      s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
>  }
> 


-- 
Thanks,

David / dhildenb