On Wed, 11 Mar 2020 09:21:44 -0400
Janosch Frank <fran...@linux.ibm.com> wrote:
> SCLP for a protected guest is done over the SIDAD, so we need to use
> the s390_cpu_pv_mem_* functions to access the SIDAD instead of guest
> memory when reading/writing SCBs.
>
> To not confuse the sclp emulation, we set 0x4000 as the SCCB address,
> since the function that injects the sclp external interrupt would
> reject a zero sccb address.
>
> Signed-off-by: Janosch Frank <fran...@linux.ibm.com>
> Reviewed-by: David Hildenbrand <da...@redhat.com>
> ---
> hw/s390x/sclp.c | 30 ++++++++++++++++++++++++++++++
> include/hw/s390x/sclp.h | 2 ++
> target/s390x/kvm.c | 24 +++++++++++++++++++-----
> 3 files changed, 51 insertions(+), 5 deletions(-)
>
> diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
> index af0bfbc2eca74767..5f3aa30d6283dce5 100644
> --- a/hw/s390x/sclp.c
> +++ b/hw/s390x/sclp.c
> @@ -193,6 +193,36 @@ static void sclp_execute(SCLPDevice *sclp, SCCB
> *sccb, uint32_t code) }
> }
>
> +/*
> + * We only need the address to have something valid for the
> + * service_interrupt call.
> + */
> +#define SCLP_PV_DUMMY_ADDR 0x4000
> +int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb,
> + uint32_t code)
> +{
> + SCLPDevice *sclp = get_sclp_device();
> + SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
> + SCCB work_sccb;
> + hwaddr sccb_len = sizeof(SCCB);
> +
> + /*
> + * Only a very limited amount of calls is permitted by the
> + * Ultravisor and we support all of them, so we don't check for
> + * them. All other specification exceptions are also interpreted
> + * by the Ultravisor and hence never cause an exit we need to
> + * handle.
> + *
> + * Setting the CC is also done by the Ultravisor.
> + */
> + s390_cpu_pv_mem_read(env_archcpu(env), 0, &work_sccb, sccb_len);
> + sclp_c->execute(sclp, &work_sccb, code);
> + s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb,
> + be16_to_cpu(work_sccb.h.length));
> + sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR);
> + return 0;
> +}
> +
> int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t
> code) {
> SCLPDevice *sclp = get_sclp_device();
> diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h
> index c54413b78cf01b27..c0a3faa37d730453 100644
> --- a/include/hw/s390x/sclp.h
> +++ b/include/hw/s390x/sclp.h
> @@ -217,5 +217,7 @@ void s390_sclp_init(void);
> void sclp_service_interrupt(uint32_t sccb);
> void raise_irq_cpu_hotplug(void);
> int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t
> code); +int sclp_service_call_protected(CPUS390XState *env, uint64_t
> sccb,
> + uint32_t code);
>
> #endif
> diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
> index 8085d5030e7c6454..ff6027036ec2f14a 100644
> --- a/target/s390x/kvm.c
> +++ b/target/s390x/kvm.c
> @@ -1227,12 +1227,26 @@ static void kvm_sclp_service_call(S390CPU
> *cpu, struct kvm_run *run, sccb = env->regs[ipbh0 & 0xf];
> code = env->regs[(ipbh0 & 0xf0) >> 4];
>
> - r = sclp_service_call(env, sccb, code);
> - if (r < 0) {
> - kvm_s390_program_interrupt(cpu, -r);
> - return;
> + switch (run->s390_sieic.icptcode) {
> + case ICPT_PV_INSTR_NOTIFICATION:
> + g_assert(s390_is_pv());
> + /* The notification intercepts are currently handled by KVM
> */
> + error_report("unexpected SCLP PV notification");
> + exit(1);
> + break;
> + case ICPT_PV_INSTR:
> + g_assert(s390_is_pv());
> + sclp_service_call_protected(env, sccb, code);
> + break;
> + case ICPT_INSTRUCTION:
> + g_assert(!s390_is_pv());
> + r = sclp_service_call(env, sccb, code);
> + if (r < 0) {
> + kvm_s390_program_interrupt(cpu, -r);
> + return;
> + }
> + setcc(cpu, r);
> }
> - setcc(cpu, r);
> }
>
> static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
Reviewed-by: Claudio Imbrenda <imbre...@linux.ibm.com>
